Engine Controls - Tests W/codes 4.6L: Diagnosis Lincoln Continental IX

DIAGNOSTIC FORMATS

QUICK TEST and CIRCUIT TESTS are diagnostic formats used to test and service EEC-V system. QUICK TEST allows technician to identify problems and retrieve diagnostic trouble codes. CIRCUIT TESTS are used to check circuits, sensors and actuators.

Before starting any CIRCUIT TEST, follow all steps under QUICK TEST to determine appropriate circuit test to perform. If vehicle passes QUICK TEST and no driveability symptoms or intermittent faults exist, EEC-V system is okay.

DIAGNOSTIC TROUBLE CODES

During QUICK TEST, 3 types of Diagnostic Trouble Codes (DTCs) are retrieved: KOEO, KOER and Continuous Memory DTCs. See QUICK TEST for self-test procedures. DTCs may be cleared from PCM memory after DTCs have been recorded or fault has been repaired. See CLEARING CODES . If fault is still present after clearing DTCs, fault will reset.

KOEO & KOER On-Demand Self-Test DTCs

Record DTCs in order received. These DTCs indicate current faults in system and should be serviced in order of appearance. Use DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART to identify appropriate CIRCUIT TEST to perform.

Note. If self-test will not activate or TOOL COMMUNICATION ERROR is received, go to CIRCUIT TEST QA .

Diagnostic Aids

After each service or repair procedure has been completed, always repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Generic Scan Tool

Ensure scan tool meets or exceeds OBD-II standard. Follow scan tool manufacturer's operating instructions to hook up equipment and record DTCs.

New Generation STAR (NGS) Scan Tool

Turn ignition off. Ensure proper memory (EPROM) card is inserted into NGS scan tool. Connect service connectors of adapter cable to vehicle Data Link Connector (DLC) and NGS scan tool. (Scheme 1) Connect NGS scan tool power supply cable to power and go to KOEO ON-DEMAND SELF-TEST.

Scheme 1

Performing Self-Test

To perform self-test, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select VEHICLE & ENGINE SELECTION menu.
2. Select NEW VEHICLE, YEAR & MODEL.
3. Select DIAGNOSTIC DATA LINK.
4. Select PCM - POWERTRAIN CONTROL MODULE.
5. Select DIAGNOSTIC TEST MODE.
6. Select KOEO ON-DEMAND SELF-TEST.
7. Turn ignition on.
8. Follow operating instructions from scan tool menu.
9. Record DTCs and perform appropriate circuit test. See «DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART»(ref-131243-S33178436662001123100000) . After test is completed, cycle ignition switch before performing other self-tests or driving vehicle.

To perform self-test, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select VEHICLE & ENGINE SELECTION menu.
2. Select NEW VEHICLE, YEAR & MODEL.
3. Select DIAGNOSTIC DATA LINK.
4. Select PCM - POWERTRAIN CONTROL MODULE.
5. Select DIAGNOSTIC TEST MODE.
6. Select KOER ON-DEMAND SELF-TEST.
7. Start engine and allow to idle.
8. Follow operating instructions from scan tool menu.
9. Record DTCs and perform appropriate circuit test. See «DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART»(ref-131243-S33178436662001123100000) . After test is completed, cycle ignition switch before performing other self-tests or driving vehicle.

To perform self-test, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select VEHICLE & ENGINE SELECTION menu.
2. Select NEW VEHICLE, YEAR & MODEL.
3. Select DIAGNOSTIC DATA LINK.
4. Select PCM - POWERTRAIN CONTROL MODULE.
5. Select DIAGNOSTIC TEST MODE.
6. Select RETRIEVE/CLEAR CONTINUOUS DTCs.
7. Turn ignition on.
8. Follow operating instructions from scan tool menu.
9. Record DTCs and perform appropriate circuit test. See «DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART»(ref-131243-S33178436662001123100000) . After test is completed, cycle ignition switch before performing other self-tests or driving vehicle.

ON-BOARD SYSTEM READINESS (OSR) TEST MODE

All OBD-II scan tools should be able to display the OSR test. The OSR will display monitors on the vehicle and status of all monitors, complete or not complete. If not complete, the scan tool will display which monitor has not completed.

To enter OSR, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select VEHICLE & ENGINE SELECTION menu.
2. Select NEW VEHICLE, YEAR & MODEL.
3. Follow operating instructions from scan tool menu.
4. Select GENERIC OBD-II FUNCTIONS. Press TEST button if monitors are not complete.
5. Start engine and allow to idle.
6. Select ON-BOARD SYSTEM READINESS.

OUTPUT TEST MODE

This mode allows a technician to energize and de-energize most of the system output actuators on command. After accessing OUTPUT TEST MODE, outputs and cooling fans can be turned on and off separately.

To access OUTPUT TEST MODE, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select VEHICLE & ENGINE SELECTION menu.
2. Select NEW VEHICLE, YEAR & MODEL.
3. Follow operating instructions from scan tool menu.
4. Select DIAGNOSTIC DATA LINK.
5. Select PCM - POWERTRAIN CONTROL MODULE.
6. Select DIAGNOSTIC TEST MODE.
7. Select ACTIVE COMMAND MODE.
8. Select OUTPUT TEST MODE.
9. Turn ignition on.
10. Follow operating instructions from scan tool menu.
11. Select either LOW SPEED FAN, HIGH SPEED FAN or ALL ON mode.
12. Select START to turn outputs on. This step may cause link up to PIDs.
13. Select STOP to turn outputs off.

DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART

DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART

CIRCUIT TEST A - NO START/VEHICLE WILL NOT START

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Enter this CIRCUIT TEST only when all steps under QUICK TEST have been successfully completed and engine still does not start or if directed here from another test or chart. This test is only intended to diagnose

1. Powertrain Control Module (PCM).
2. Spark (PCM-controlled).

To prevent replacement of good components, be aware the following non-EEC related areas and components may be cause of problem

1. Fuel quality and quantity.
2. Ignition (general condition).
3. Engine mechanical components.
4. Starter and battery circuits.

Identifying Crankshaft Position Sensor Circuits. Scheme 2

1. 1) Check Anti-Theft System If vehicle does not have a anti-theft system, go to next step. If vehicle has an anti-theft system, it may be activated causing the no-start condition. Verify be observing anti-theft indicator light on instrument panel or a DTC P1260 may be present. If anti-theft system is not activated, go to next step. If anti-theft system is activated, see ANTI-THEFT SYSTEMS article in the ACCESSORIES & EQUIPMENT section for diagnosis and testing.
2. 2) Attempt To Crank Engine Ensure Inertia Fuel Shutoff (IFS) switch is closed (button pushed in). Try to start engine. If engine does not crank, check vehicle starting and charging systems. Repair as necessary and retest. If engine cranks, go to next step.
3. 3) Check For Intermittent Attempt to start engine. If engine now starts, fault is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000), step 50). If engine does not start, go to next step.
4. 4) Check VREF At TP Sensor Turn ignition off. Disconnect TP sensor. Turn ignition on. Measure voltage between circuits VREF and SIG RTN at TP sensor wiring harness connector. (Scheme 4) If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000).
5. 5) Check Flash EPROM (FEPS) Circuit For Short To Power Measure voltage between ground and DLC terminal No. 13. see scheme 1 If voltage is less than 9 volts, go to step 17). If voltage is 9 volts or more, repair circuit for a short to power.
6. 6) Check PIP Parameter Identifications (PID) Using scan tool, select PIP PID from PID/DATA monitor menu. While observing scan tool, crank engine. If PIP value is switching on and off, check secondary ignition components (ignition coils, spark plugs and wires). See «CIRCUIT TEST JB»(ref-131243-S19672241292001123100000). Repair as necessary. If secondary ignition is okay, go to next step.
7. 7) Check Fuel Pressure Turn ignition off. Release fuel pressure. See REMOVE/INSTALL/OVERHAUL article. With scan tool connected, turn ignition on. Using scan tool, access OUTPUT TEST MODE. See «ADDITIONAL SYSTEM FUNCTIONS»(ref-131243-S18244494152001123100000). Command fuel pump on. If fuel pressure is as specified, go to next step. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123324) article. If fuel pressure is not as specified, go to «CIRCUIT TEST HC»(ref-131243-S35918939922001123100000).
8. 8) Check Fuel Pressure Leakdown Leave fuel pressure gauge installed and ignition on. Using scan tool, access OUTPUT TEST MODE. Command fuel pump on to obtain maximum fuel pressure. Exit OUTPUT TEST MODE and turn ignition off. If fuel pressure remains within 2.3 psi (16 kPa) of maximum pressure for one minute after turning ignition off, replace PCM. If fuel pressure does not remain within 2.3 psi (16 kPa), go to «CIRCUIT TEST HC»(ref-131243-S35918939922001123100000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 8) to step 17). No test procedures have been omitted.
9. 17) Check PCM Driver To Coils Turn ignition off. Connect 12-volt test light between B+ and coil driver circuit. Crank engine while observing test light. Repeat procedure for each coil driver. Test light should blink brightly, once for each engine revolution. If test light blinks as specified, replace PCM. If test light does not blink as specified, go to «CIRCUIT TEST JD»(ref-131243-S12716587472001123100000), step 1).

CIRCUIT TEST B - EEC-V POWER RELAY

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

This circuit test is only intended to diagnose the following components and circuits

1. Vehicle wiring harness circuits (VPWR, IGNITION START/RUN, B+ and Ground).
2. Power relay.
3. Powertrain Control Module (PCM).

Identifying Power Relay Circuits. Scheme 3

1. 1) Check VPWR Circuit Resistance Turn ignition off. Disconnect Idle Air Control (IAC) solenoid and power relay wiring harness connectors. Disconnect scan tool (if applicable). Measure resistance of VPWR circuit between IAC solenoid wiring harness connector and power relay. (Scheme 3) If resistance is less than 5 ohms, reconnect IAC solenoid and go to next step. If resistance is 5 ohms more, repair open in VPWR circuit between power relay and IAC solenoid.
2. 2) Check Voltage To Power Relay Ensure ignition is off and power relay is disconnected. Measure voltage between ground and B+ terminal at power relay wiring harness connector. Note voltage reading. Turn ignition on. Measure voltage between ground and IGN START/RUN terminal at power relay wiring harness connector. If any voltage reading is less than 10.5 volts, repair open circuit. If both voltage readings are more than 10.5 volts, replace power relay.
3. 3) Check Ground Circuit To Power Relay Measure voltage between ground terminal and B+ terminal at power relay wiring harness connector. If voltage is more than 10.5 volts, replace power relay. If voltage is 10.5 volts or less, repair open in ground circuit.

CIRCUIT TEST C - REFERENCE VOLTAGE

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

SIG RTN is a dedicated ground used by most EEC-V system sensors. VREF is a 5-volt reference voltage that is continuously output by PCM. This consistent voltage signal is used on all 3-wire sensors.

This circuit test is only intended to diagnose the following components and circuits

1. A/C Pressure (ACP) sensor, Differential Pressure Feedback EGR (DPFE) sensor and Throttle Position (TP) sensor.
2. Vehicle wiring harness circuits (SIG RTN and VREF).
3. Powertrain Control Module (PCM).

Identifying TP Sensor Circuits. Scheme 4

Scheme 5

1. 1) Check VREF Circuit Voltage Disconnect TP sensor connector. Turn ignition on. Measure voltage between SIG RTN and VREF circuit terminals at TP sensor wiring harness connector. If voltage is more than 6 volts, go to step 35). If voltage is 6 volts or less, go to next step.
2. 2) Check Battery Voltage Measure voltage between battery terminals. If battery voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, recharge or replace battery as necessary. Check charging system and repair as necessary.
3. 3) Check SIG RTN Circuit Disconnect suspect sensor wiring harness connector. Measure voltage between SIG RTN terminal at suspect sensor wiring harness connector and positive battery terminal. If voltage reading is more than 10.5 volts and within one volt of battery voltage, go to next step. If voltage is 10.5 volts or less, go to step 25).
4. 4) Check Scan Tool Ability To Access Parameter Identification (PID) PID is area of PCM Random Access Memory (RAM) that holds operating information for input and output data. Using scan tool, attempt to select TP PID from PID/DATA monitor menu. If scan tool is able to access TP PID, go to step 20). If scan tool is unable to access TP PID, go to next step.
5. 5) Check VPWR To Idle Air Control (IAC) Solenoid Turn ignition off. Ensure TP sensor is disconnected. Disconnect IAC solenoid connector. Turn ignition on. Measure voltage between VPWR terminal (Red wire) at IAC wiring harness connector and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, reconnect connectors and go to «CIRCUIT TEST B»(ref-131243-S26199635552001123100000). (Scheme 5): Identifying IAC Wiring Harness Connector Terminals
6. 6) Check For Shorted DPFE Or EGR Valve Position (EVP) Sensor Ensure TP sensor is disconnected. Disconnect Fuel Tank Pressure (FTP) sensor/transducer. See FUEL TANK PRESSURE (FTP) SENSOR/TRANSDUCER LOCATION table. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at TP sensor wiring harness connector. If voltage is 4-6 volts, replace DPFE sensor or EGR valve position sensor. If voltage is not 4-6 volts, go to next step. FUEL TANK PRESSURE (FTP) SENSOR/TRANSDUCER LOCATION Application Location Continental Part Of Fuel Pump Assembly
7. 7) Check For Shorted FTP Sensor/Transducer Ensure TP sensor and FTP sensor/transducer are disconnected. Disconnect DPFE sensor. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at TP sensor wiring harness connector. If voltage is 4-6 volts, replace FTP sensor. If voltage is not 4-6 volts, proceed as follows: On models with A/C Pressure (ACP) sensor, go to next step. On models with Power Steering Pressure (PSP) sensor, go to step 9). On models with Fuel Rail Pressure (FRP) sensor, go to step 10). On all other models, go to step 11).
8. 8) Check For Shorted AC Pressure (ACP) Sensor Ensure DPFE, TP sensor and FTP sensor/transducer (if applicable) are disconnected. Disconnect ACP sensor. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at TP sensor wiring harness connector. If voltage is 4-6 volts, replace ACP sensor. If voltage is not 4-6 volts, proceed as follows: On models with PSP sensor, go to next step. On models with FRP sensor, go to step 10). On all other models, go to step 11).
9. 9) Check For Shorted Power Steering Pressure (PSP) Sensor Ensure DPFE, TP sensor and ACP sensor (if applicable) are disconnected. Disconnect PSP sensor. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at TP sensor wiring harness connector. If voltage is 4-6 volts, replace PSP sensor. If voltage is not 4-6 volts, go to next step (models with FRP sensor) or step 11) (all other models). NOTE: Fuel Rail Pressure (FRP) sensor may also be known as Injection Pressure (IP) sensor.
10. 10) Check For Shorted Fuel Rail Pressure (FRP) Sensor Ensure DPFE and TP sensors are disconnected. Disconnect FRP sensor. Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at TP sensor wiring harness connector. If voltage is 4-6 volts, replace FRP sensor. If voltage is not 4-6 volts, go to next step.
11. 11) Check VPWR To PCM Turn ignition off. Leave all previously disconnected sensors disconnected. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install Breakout Box (014-00950) leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 71 (VPWR) and 77 (PWR GND) at breakout box. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit between IAC splice and PCM.
12. 12) Check VREF Circuit For Short To Ground Or SIG RTN Turn ignition off. Leave all previously disconnected sensors disconnected. Disconnect scan tool Data Link Connector (DLC). Measure resistance between test pin No. 90 (VREF) and test pins No. 51 and 103 (PWR GND), and 91 (SIG RTN). If any resistance reading is 10,000 ohms or less, repair VREF short to ground. If all resistance readings are more than 10,000 ohms, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.
13. 20) Check VREF Resistance To PCM Turn ignition off. Ensure sensor with failed VREF circuit is disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950) leaving PCM disconnected. Measure resistance between test pin No. 90 (VREF) and VREF terminal at suspect sensor wiring harness connector. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in VREF circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 20) to step 25). No test procedures have been omitted.
14. 25) Check Scan Tool Ability To Access Parameter Identification (PID) Using scan tool, select TP PID from PID/DATA monitor menu. If scan tool is able to access TP PID, go to next step. If scan tool is unable to access TP PID, go to step 28).
15. 26) Check KOEO DTCs If KOEO DTCs are present for 2 or more sensors connected to SIG RTN circuit, go to next step. If KOEO DTCs are not as specified, repair open in SIG RTN circuit to sensor where VREF circuit failed.
16. 27) Check SIG RTN Circuit Resistance To PCM Turn ignition off. Disconnect scan tool Data Link Connector (DLC). Disconnect sensor where VREF circuit failed. Disconnect PCM 104-pin connector. Inspect connector for damage and repair as necessary. Install Breakout Box (014-00950) leaving PCM disconnected. Measure resistance between test pin No. 91 (SIG RTN) and SIG RTN terminal of suspect sensor wiring harness connector. If resistance is less than 5 ohms, reconnect sensor and go to next step. If resistance is 5 ohms or more, repair open in SIG RTN circuit.
17. 28) Check PCM PWR GND Circuits Turn ignition off. Leave scan tool disconnected. Measure resistance between negative battery terminal and test pins No. 51, 77 and 103 (PWR GND) at breakout box. If all resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit.
18. 29) Check Ground Circuits In PCM Leave ignition off and scan tool disconnected. Connect PCM to breakout box. Measure resistance between test pin No. 91 (SIG RTN) and test pins No. 51, 77 and 103 (PWR GND) at breakout box. If all resistance readings are less than 5 ohms, PWR GND and SIG RTN circuits are okay. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000). If any resistance reading is 5 ohms or more, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 29) to step 35). No test procedures have been omitted.
19. 35) Check VREF Circuit For Short To Power Turn ignition off. Ensure sensor with failed VREF circuit is disconnected. Disconnect all other sensors connected to VREF circuit. (Scheme 6) Disconnect PCM. Turn ignition on. Measure voltage between negative battery terminal and VREF terminal at TP sensor wiring harness connector. If voltage is less than.5 volt, replace PCM. If voltage is.5 volt or more, repair VREF circuit for a short to power.

Identifying Sensors Connected To VREF Circuit. Scheme 6

CIRCUIT TEST DA - TEMPERATURE SENSOR TEST (IAT & ECT)

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test only when directed by QUICK TEST . Ambient air temperature must be at least 50°F (10°C) to receive valid input from Intake Air Temperature (IAT) sensor. Engine coolant temperature must be more than 50°F (10°C) to pass KOEO SELF-TEST and more than 180°F (82°C) to pass KOER SELF-TEST. Voltage values in this test are based on a 5-volt VREF signal. Values may vary up to 15 percent due to sensor and VREF variations.

This circuit test is intended to diagnose the following components and circuits

1. Intake Air Temperature (IAT) sensor.
2. Engine Coolant Temperature (ECT) sensor.
3. Wiring harness circuits (IAT, ECT and SIG RTN).
4. Powertrain Control Module (PCM).

To prevent replacing good components, ensure the following non-EEC areas or components are not cause of problem

1. Coolant level low.
2. Cooling system, water pump or fan.
3. Engine operating temperature.
4. Engine oil level low.
5. Thermostat.
6. Air cleaner duct.
7. Ambient temperature.

Throttle Position (TP) Sensor Connector Terminals. Scheme 7

Temperature Sensor Circuits & Connector Terminals. Scheme 8

1. 1) DTC P1116 This DTC indicates sensor is out of self-test range. Correct range for measurement is.3-3.7 volts. Check for following possible causes: Low coolant level. Faulty harness connector. Faulty sensor. Start engine and run until engine is at normal operating temperature. If vehicle cannot be started, go to step 3). Ensure upper radiator hose is hot and pressurized. Repeat «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P1116 is present, go to next step. If DTC P1116 is not present, fault is intermittent and cannot be identified at this time. Testing is complete.
2. 2) Check VREF Circuit Voltage At TP Sensor Turn ignition off. Disconnect Throttle Position (TP) sensor. Turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. (Scheme 4) If voltage is 4-6 volts, reconnect TP sensor and go to step 3). If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000).
3. 3) Check Temperature Sensor Resistance (KOEO) Turn ignition off. Disconnect suspect sensor. Measure resistance between signal circuit (ECT or IAT) terminal and SIG RTN terminal at suspect sensor wiring harness connector. See «IAT & ECT SENSOR SPECIFICATIONS»(ref-131243-S41826559732001123100000) table. If resistance is not as specified, replace suspect sensor. If resistance is as specified, perform following step as applicable: For diagnosing vehicles with ECT sensor related fault and a no-start condition, DO NOT service DTC P1116 at this time. Repair no-start condition. See TESTS W/O CODES - EEC-V article. For diagnosing vehicles with cooling fan concerns or engine cooling concerns, DO NOT service DTC P1116 at this time. Service next DTC. If no other DTCs are present, identify symptom and repair as necessary. See TESTS W/O CODES - EEC-V article. For diagnosing vehicles without a no-start condition, cooling fan concern or engine cooling concern, go to next step.
4. 4) Check Temperature Sensor Resistance (KOER) Warm engine to normal operating temperature. Turn ignition off. Disconnect suspect sensor. Start engine and operate at 2000 RPM for 2 minutes. Measure resistance between signal circuit (ECT or IAT) terminal and SIG RTN terminal at suspect sensor wiring harness connector. See IAT & ECT SENSOR SPECIFICATIONS table. If resistance is as specified, replace PCM. If resistance is not as specification, replace sensor. IAT & ECT SENSOR SPECIFICATIONS Temperature °F (°C) (1) Volts (1) Ohms 50 (10) 3.51 58,750 68 (20) 3.07 27,300 86 (30) 2.60 24,270 104 (40) 2.13 16,150 122 (50) 1.70 10,970 140 (60) 1.33 7700 158 (70) 1.02 5370 176 (80) 0.78 3840 194 (90) 0.60 2800 212 (100) 0.46 2070 (1) Values may vary by 15 percent. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 10). No test procedures have been omitted.
5. 10) DTC P0118 Or P0113: Induce Opposite DTC (117 Or 112) DTC P0118 (ECT) or P0113 (IAT) indicate corresponding sensor signal is more than self-test maximum. Maximum signal voltage for ECT and IAT sensor is 4.6 volts. Possible causes for excess voltage signals are: Open circuit in wiring harness (IAT or ECT). Faulty connection. Faulty sensor. Faulty PCM. Turn ignition off. Disconnect suspect temperature sensor. Connect a jumper wire between signal circuit (ECT or IAT) terminal and SIG RTN terminal at suspect sensor wiring harness connector. With scan tool installed, turn ignition on. NOTE: If communication link error is displayed, remove jumper wire and go to step 12). Using scan tool, select ECT V or IAT V PID from PID/DATA monitor. If PID value is less than.2 volt, replace sensor. If PID value is.2 volt or more, remove jumper wire and go to next step.
6. 11) Check Resistance Of Sensor Signal & SIG RTN Circuits Turn ignition off. Ensure suspect temperature sensor is disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 38 (ECT sensor) or test pin No. 39 (IAT sensor) at breakout box and SIG RTN terminal at suspect sensor wiring harness connector. Also, measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal at suspect sensor wiring harness connector. If both resistance readings are less than 5 ohms, replace PCM. If any resistance reading is 5 ohms or more, repair open circuit.
7. 12) Check For Sensor Signal Short To VREF Turn ignition off. Ensure suspect temperature sensor is disconnected. Measure resistance between test pin No. 90 (VREF) and test pin No. 38 (ECT sensor) or test pin No. 39 (IAT sensor) at breakout box. If resistance is 10,000 ohms or more, replace PCM. If resistance is less than 10,000 ohms, repair short circuit to VREF. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.
8. 20) DTC P0117 Or P0112 DTC P0117 (ECT) or P0112 (IAT) indicates sensor signal is less than self-test minimum. Minimum signal for IAT and ECT sensor is.2 volt. Possible causes for these faults are: Circuit grounded in wiring harness. Faulty sensor. Faulty connection. Faulty PCM. Turn ignition off. Disconnect suspect temperature sensor connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition on. Using scan tool, select ECT V of IAT V PID from PID/DATA monitor menu. If PID value is less than 4.2 volts, go to next step. If PID value is 4.2 volts or more, replace sensor.
9. 21) Check VREF Circuit Voltage At TP Sensor Turn ignition off. Disconnect TP sensor connector. Turn ignition on. Measure voltage between VREF and SIG RTN at TP sensor wiring harness connector. If voltage is 4-6 volts, connect TP sensor and go to next step. If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000).
10. 22) Check Signal Circuit For Short To Ground Turn ignition off. Disconnect suspect sensor. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 38 (ECT) or No. 39 (IAT) and test pins No. 24, 51 and 91. If any resistance reading is less than 10,000 ohms, repair short to ground. If all resistance readings are 10,000 ohms or more, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 90). No test procedures have been omitted.
11. 90) Continuous Memory DTC P0112, P1112, P0113, P0117, P1117 Or P0118: Check Sensor These DTCs indicate possible intermittent fault. Possible causes for these faults are: Faulty sensor. Faulty sensor connector. Open or grounded circuit in harness. Faulty PCM. Turn ignition on. Using scan tool, select ECT or IAT PID from PID/DATA monitor menu. While observing PID, tap on sensor to simulate road shock. Wiggle sensor connector. If no change in temperature reading occurs, go to next step. If any change in temperature occurs, turn ignition off. Inspect connectors for loose, damaged or corroded terminals. Repair as necessary. If connectors are okay, replace sensor.
12. 91) Check EEC-V Wiring Harness While still observing PID, wiggle and bend small sections of wiring harness working toward PCM. If fault is indicated, isolate fault and repair as necessary. If no fault is found, go to next step.
13. 92) Inspect PCM & Wiring Harness Connectors Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose terminals. If connectors and terminals are damaged, repair as necessary. Clear DTCs and repeat «QUICK TEST»(ref-131243-S07493578722001123100000). If connectors and terminals are okay, fault cannot be identified at this time. Testing is complete. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 92) to step 100). No test procedures have been omitted.
14. 100) DTC P0125 These DTCs indicate ECT sensor has not reached normal operating temperature. Possible causes for this fault are: Insufficient engine warm-up time. Thermostat leaking or stuck open. Low coolant.. Check and repair cooling system as necessary. Clear DTCs and repeat «QUICK TEST»(ref-131243-S07493578722001123100000)

CIRCUIT TEST DB - ENGINE FUEL TEMPERATURE (EFT) SENSOR

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test only when directed by QUICK TEST . EFT sensor will operate within the range of -40-275°F (-40-135°C). This circuit test is intended to diagnose the following components and circuits

1. EFT sensor.
2. Wiring harness circuits (EFT and SIG RTN).
3. Powertrain Control Module (PCM).

Engine Fuel Temperature (EFT) Sensor Connector Terminals. Scheme 9

Fuel Rail Pressure (FRP) Sensor Connector Terminals. Scheme 10

PCM EFT TERMINAL IDENTIFICATION

EFT SENSOR SPECIFICATIONS

Note. Fuel Rail Pressure (FRP) sensor may also be known as Injection Pressure (IP) sensor. Engine Fuel Temperature (EFT) sensor may also be known as Fuel Rail Temperature (FRT) sensor.

1. 1) DTC P0181: Check For KOER DTCs This DTC indicates sensor signal is greater than self-test maximum. Check for following possible causes: Open circuit in wiring harness. Faulty wiring harness connector. Faulty EFT sensor. Faulty PCM. Start engine. Ensure engine is at normal operating temperature. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P0182 or P0183 is present with DTC P0181, go to next step. If only DTC P0181 is present, clear DTCs. Perform OBD-II DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000).
2. 2) DTC P0180, P0181, P0182 Or P0183 These DTCs indicate sensor signal is greater or less than self-test maximum. Check for following possible causes: Open or short circuit in wiring harness. Faulty wiring harness connector. Faulty EFT sensor. Faulty PCM. Turn ignition off. Disconnect EFT sensor connector. With scan tool connected, turn ignition on. NOTE: If scan tool communication link error is displayed, remove jumper wire and go to step 5). Using scan tool, select EFTA V PID from PID/DATA monitor menu. Note PID value. Connect a jumper wire between signal circuit (EFT A) terminal and SIG RTN terminal at EFT sensor wiring harness connector. If PID value is more than 4.5 volts with sensor disconnected and less than.2 volt with jumper wire connected, replace EFT sensor. If PID value is not as specified, proceed as follows. For DTC P0182, go to next step. For DTC P0183, go to step 5). If PID value is less than 4.5 volts with EFT sensor disconnected, go to next step. If PID value is more than.2 volt with jumper wire connected, go to step 5).
3. 3) Check VREF Circuit Voltage At Fuel Rail Pressure (FRP) Sensor Turn ignition off. Disconnect FRP sensor connector. Turn ignition on. Measure voltage between ground and VREF terminal at FRP sensor wiring harness connector. (Scheme 10) If voltage is 4-6 volts, connect FRP sensor and go to step 7). If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000).
4. 4) Check Signal Circuit For Short To Ground Turn ignition off. Ensure EFT sensor is disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin for EFT circuit and test pin No. 91 at breakout box. See «PCM EFT TERMINAL IDENTIFICATION»(ref-131243-S18240793982001123100000) table. Also, measure resistance between test pin for EFT A circuit and ground. If both resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair short to ground.
5. 5) Check EFT Signal For Short To VREF Measure resistance between test pin for EFT A circuit and test pin No. 90 at breakout box. See «PCM EFT TERMINAL IDENTIFICATION»(ref-131243-S18240793982001123100000) table. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to VREF circuit.
6. 6) Check For Open Circuit Measure resistance of EFT A circuit between test pin for EFT A circuit at breakout box and EFT sensor wiring harness connector. See «PCM EFT TERMINAL IDENTIFICATION»(ref-131243-S18240793982001123100000) table. (Scheme 9) Also, measure resistance of SIG RTN circuit between EFT sensor wiring harness connector and test pin No. 91 at breakout box. If both resistance readings are less than 5 ohms, replace PCM. If any resistance reading is 5 ohms or more, repair open circuit.
7. 7) Continuous Memory DTC P0180, P0181, P0182 Or P0183 These DTCs indicate possible intermittent fault. Possible causes for these faults are: Faulty sensor. Faulty sensor connector. Faulty wiring harness. Faulty PCM. Turn ignition on. Using scan tool, select EFTA PID from PID/DATA monitor menu. While observing PID, tap on sensor to simulate road shock. Wiggle sensor connector. If no change in temperature reading occurs, go to next step. If any change in temperature occurs, inspect connectors for loose, damaged or corroded terminals. Repair as necessary. If connectors are okay, replace PCM.
8. 8) Check Sensor Wiring Harness While observing EFTA PID, wiggle and bend small sections of wiring harness working toward PCM. If fault is indicated, isolate fault and repair as necessary. If no fault is found, go to next step.
9. 9) Inspect PCM & Wiring Harness Connectors Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. If connectors and terminals are damaged, repair as necessary and repeat «QUICK TEST»(ref-131243-S07493578722001123100000). If connectors and terminals are okay, fault cannot be identified at this time. Testing is complete.

CIRCUIT TEST DC - MASS AIRFLOW (MAF) SENSOR

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when directed by QUICK TEST. This CIRCUIT TEST is intended to diagnose the following

1. MAF sensor.
2. Wiring harness circuits (VPWR, PWR GND, MAF SIG and MAF RTN).
3. Powertrain Control Module (PCM).

To prevent replacement of good components, be aware the following non-EEC related areas may be cause of problem

1. Air cleaner element.
2. Inlet air duct.
3. Throttle body.

MAF Sensor Extension Circuits & Connector Terminals. Scheme 11

1. 1) KOER DTC P1101: Check MAF Sensor Continuous Memory DTCs DTC P1101, retrieved during KOER ON-DEMAND SELF-TEST, indicates MAF signal was not 0.34-1.96 volts during self-test. Drive vehicle for 10 minutes and repeat «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) and «CONTINUOUS MEMORY SELF-TEST»(ref-131243-S36947921172001123100000) . If any Continuous Memory DTCs are present with KOER P1101, proceed as follows: Continuous Memory DTC P0102, go to step 6). Continuous Memory DTC P0103, go to step 20). All other Continuous Memory DTCs, service DTCs as necessary. If no Continuous Memory DTCs are present with KOER P1101, go to next step. NOTE: DTC P1101 may be caused by low battery or by use of a garage exhaust ventilation system. Ensure vehicle is vented to outside atmosphere before repeating «QUICK TEST»(ref-131243-S07493578722001123100000) .
2. 2) KOEO/KOER DTC P1101: MAF Output Voltage DTC P1101, retrieved during KOEO or KOER ON-DEMAND SELF-TEST, indicates voltage exceeded .2-volt test range. Possible causes for this fault are: Air leak before or after MAF sensor. Faulty or contaminated MAF sensor. Faulty MAF sensor wiring harness connector. Open PWR GND or MAF RTN circuit. Faulty PCM. Turn ignition off. Ensure MAF sensor is connected properly. If MAF sensor is not connected properly, repair as necessary and retest. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950) and connect PCM to breakout box. Turn ignition on. Measure voltage between test pin No. 88 (MAF SIG) and test pins No. 103 (PWR GND) at breakout box. If voltage is more than .2 volt, go to step 12). If voltage is .2 volt or less, go to step 8).
3. 3) Continuous Memory DTC P1100: Check MAF Circuit Intermittent Voltage Input DTC P1100, retrieved from continuous memory indicates voltage went out of range (.39-3.90 volts) sometime during previous 40 warm-up cycles. Possible causes for this fault are: Faulty MAF sensor. Faulty MAF sensor wiring harness circuit or connector. Start engine and allow to idle. If engine does not idle smoothly, repair cause of rough idle condition before continuing. Raise engine speed to 1500 RPM for 5 seconds, and return to idle. Using scan tool, select MAF PID from PID/DATA monitor menu. While observing PID, tap on sensor to simulate road shock. Wiggle sensor connector. If MAF PID voltage stays within .39-3.90 volts range, go to next step. If MAF PID voltage does not stay within .39-3.90 volts range, check MAF sensor connector for loose, damaged or corroded terminals. Repair as necessary. If connector is okay, replace MAF sensor.
4. 4) Check MAF Sensor Circuit Integrity Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950) and connect PCM to breakout box. Turn ignition on. Connect voltmeter between test pin No. 36 (MAF RTN) and No. 88 (MAF SIG). While observing voltmeter, wiggle and bend wiring harness between sensor and dash panel. Wiggle and bend wiring harness between dash panel and PCM. If voltage reading goes out of normal range (.39-3.90 volts), isolate fault and repair as necessary. Reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes. If voltage does not go out of normal range, fault cannot be duplicated or identified at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 6). No test procedures have been omitted.
5. 6) Continuous Memory & KOER DTC P0102: Check MAF Low Input Signal To PCM DTC P0102 indicates MAF signal was less than .39 volt sometime during normal engine operation. Possible causes for this fault are: Open or closed MAF circuit. Open circuit (MAF, MAF RTN, PWR GND, or VPWR). MAF circuit shorted to ground. Air leak before or after MAF sensor. Faulty MAF sensor or connector. Faulty TP system. Faulty PCM. Ensure air induction system is okay. Repair if necessary. Start engine and allow to idle. If engine does not idle smoothly, repair cause of rough idle condition before continuing. If KOER DTC P0505 is present, go to «CIRCUIT TEST KE»(ref-131243-S40499418132001123100000) , step 2). On A/T models, if vehicle cannot maintain an idle and engine stalls, go to step 9). If engine idles smoothly, raise engine speed to 1500 RPM for 5 seconds then return to idle. Using scan tool, select MAF V PID from PID/DATA monitor menu. If PID value is less than .39 volt, go to next step. If PID value is .6-1.0 volt, go to step 15). For all other PID values, go to step 2).
6. 7) Check VPWR Circuit Voltage Turn ignition off. Disconnect MAF sensor. Turn ignition on. Measure voltage between VPWR terminal of MAF sensor wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit. Reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.
7. 8) Check Resistance Of VPWR Circuit Turn ignition off. Leave MAF sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between VPWR terminal of MAF sensor wiring harness connector and test pin No. 71 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in VPWR circuit.
8. 9) Check MAF Circuit For Short To Ground Or MAF RTN Circuit Disconnect scan tool Data Link Connector (DLC). Measure resistance between test pin No. 88 (MAF SIG) and test pins No. 36 (MAF RTN), 51 and 103 (PWR GND) at breakout box. If all resistance readings are more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground and reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.
9. 10) Check MAF RTN Circuit For Short To PWR GND Circuit Measure resistance between test pin No. 36 (MAF RTN) and test pins No. 51 and 103 (PWR GND) at breakout box. If both resistance readings are more than 10,000 ohms, reconnect scan tool and go to next step. If resistance is 10,000 ohms or less, repair short to ground and reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.
10. 11) Check Resistance Of MAF Signal Circuit Measure resistance between MAF terminal at MAF sensor wiring harness connector and test pin No. 88 (MAF) at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in MAF circuit and reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.
11. 12) Check PWR GND Circuit To MAF Sensor Connect PCM to breakout box. Turn ignition on. Measure voltage between VPWR and PWR GND terminals at MAF sensor wiring harness connector. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, go to step 14).
12. 13) Check PWR GND Circuit Resistance Disconnect PCM from breakout box. Disconnect scan tool Data Link Connector (DLC). Measure resistance between PWR GND terminal at MAF sensor wiring harness connector and negative battery terminal. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, repair open in PWR GND circuit and reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.
13. 14) Check MAF RTN Circuit Resistance Measure resistance between MAF RTN terminal at MAF sensor wiring harness connector and test pin No. 36 (MAF RTN) at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in MAF RTN and reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.
14. 15) Check MAF Circuit For Short To Ground In PCM Connect PCM to breakout box. Disconnect scan tool Data Link Connector (DLC). Measure resistance between test pin No. 88 (MAF) and test pins No. 36 (MAF RTN), 51 and 103 (PWR GND) at breakout box. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, replace PCM.
15. 16) Check MAF RTN Circuit For Short To Ground Measure resistance between test pin No. 36 (MAF RTN) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, replace PCM.
16. 17) Check MAF Circuit Output Ensure ignition is off. Reconnect MAF sensor. Ensure PCM is connected to breakout box. Start engine and allow to idle. If engine does not idle smoothly, repair cause of rough idle condition before continuing. Measure voltage between test pin No. 88 (MAF) and negative battery terminal. If voltage is .34-1.96 volts, go to next step. If voltage is not .34-1.96 volts, replace MAF sensor and reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.
17. 18) Measure Voltage Between MAF & MAF RTN Circuits With engine idling, measure voltage between test pin No. 36 (MAF RTN) and 88 (MAF) at breakout box. If voltage is .34-1.96 volts, go to next step. If voltage is not .34-1.96 volts, replace MAF sensor and reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.
18. 19) Check MAF Circuit Output With Scan Tool Start engine and allow to idle. Using scan tool, select MAF V PID from PID/DATA monitor menu. If PID value is .34-1.96 volts, fault is intermittent and cannot be identified at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . If voltage is not .34-1.96 volts, replace PCM.
19. 20) DTC P0103: Check MAF High Input Signal To PCM DTC P0103 indicates MAF signal was more than 3.9 volts sometime during normal engine operation. Possible causes for this fault are: Restricted MAF sensor screen. MAF SIG circuit shorted to VPWR. Faulty MAF sensor or connector. Faulty PCM. Ensure air induction system is okay. Repair if necessary. Start engine and allow to idle. If engine does not idle smoothly, repair cause of rough idle condition before continuing. If KOER DTC P0505 is present, go to «CIRCUIT TEST KE»(ref-131243-S40499418132001123100000) , step 2) If engine idles smoothly, raise engine speed to 1500 RPM for 5 seconds then return to idle. Using scan tool, select MAF V PID from PID/DATA monitor menu. PID value should be more than 3.90 volts. Turn ignition off. Disconnect MAF sensor connector. Connect a jumper wire between PWR GND and MAF RTN terminals at MAF sensor wiring harness connector. Start engine and allow to idle. Using scan tool, select MAF V PID from PID/DATA monitor menu. If PID value does not change to less than .39 volt, go to next step. If PID value changes to less than .39 volt, replace MAF sensor and reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.
20. 21) Check MAF Circuit For Short To Power Leave ignition off and MAF sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 88 (MAF) and test pin No. 24 or 103 at breakout box. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair MAF circuit short to power.
21. 22) Check MAF Circuit For Short To VREF Turn ignition off. Measure resistance between test pin No. 88 (MAF) and test pin No. 90 (VPWR) at breakout box. If resistance is more than 10,000 ohms, replace PCM. If resistance is 10,000 ohms or less, repair short between MAF and VREF circuit and reset Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes.

CIRCUIT TEST DD - FUEL RAIL PRESSURE (FRP) SENSOR

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when directed by QUICK TEST. This CIRCUIT TEST is intended to diagnose the following

1. FRP sensor.
2. Wiring harness circuits (FRP Signal and SIG RTN).
3. Powertrain Control Module (PCM).

FRP SENSOR VOLTAGE-TO-FUEL PRESSURE CONVERSION CHART

1. 1) DTC P0192 This DTC indicates FRP voltage signal is less than self-test minimum. Possible causes for this fault are: FRP signal is shorted to SIG RTN or PWR GND. FRP circuit is open. Low fuel pressure. Faulty FRP sensor. Faulty PCM. Ensure vehicle has fuel. Turn ignition on. Using scan tool, access FRP PID from PID/DATA monitor menu. If PID voltage is less than .2 volt, go to step 3). If PID voltage is .2 volt or more, go to step 12). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 1) to step 3). No test procedures have been omitted.
2. 3) Generate Opposite Signal Turn ignition off. Disconnect FRP sensor connector. Connect a jumper wire between FRP terminal and VREF terminal at FRP sensor wiring harness connector. If scan tool communication problem is present, disconnect jumper wire and go to step 23). Using scan tool, select FRP V PID from PID/DATA monitor menu. If PID voltage is 4.6 volts or less, disconnect jumper wire and go to next step. If PID voltage is more than 4.6 volts, replace FRP sensor.
3. 4) Measure VREF Voltage With FRP sensor disconnected, turn ignition on. Measure voltage between VREF terminal and SIG RTN terminal at FRP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
4. 5) Check FRP Circuit Resistance Turn ignition off. Leave FRP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between FRP terminal at FRP sensor wiring harness connector and test pin No. 14 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in VPWR circuit.
5. 6) Check FRP Circuit For Short To PWR GND Or SIG RTN Measure resistance between test pin No. 14 and test pins No. 91 (SIG RTN), 24 and 103 (PWR GND) at breakout box. If any resistance reading is less 10,000 ohms or less, repair short circuit. If all resistance readings are more than 10,000 ohms, replace PCM.
6. 7) DTC P0193 This DTC indicates FRP voltage signal is more than self-test maximum. Possible causes for this fault are: FRP signal is shorted to VREF or PWR. High fuel pressure. Faulty FRP sensor. Faulty PCM. Turn ignition on. Using scan tool, select FRP V sensor from PID/DATA monitor menu. If PID voltage is more than 4.8 volts, go to step 9). If PID voltage is not as specified, fault may be intermittent. Go to step 14). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 7) to step 9). No test procedures have been omitted.
7. 9) DTC P0193: Generate Opposite Signal Turn ignition off. Disconnect FRP sensor connector. Turn ignition on. Using scan tool, select FRP V PID from PID/DATA monitor menu. If scan tool communication problem is present, disconnect jumper wire and go to step 23). If PID voltage is less than .2 volt, replace FRP sensor. If PID voltage is .2 volt or more, go to step 11).
8. 10) DTC P0190 Possible causes for this fault are: VREF open circuit. VREF open is sensor. Disconnect FRP sensor connector. Turn ignition on. Measure voltage between VREF and SIG RTN terminals at FRP sensor wiring harness connector. If voltage is 4-6 volts, go to step 12). If voltage is 4-6 volts, go to next step.
9. 11) Check For Open Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 14 and test pins No. 90 (VREF) and 91 (SIG RTN) at breakout box. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit.
10. 12) Measure FRP Sensor Resistance Measure resistance between FRP and SIG RTN sensor terminals. If resistance is not 30-40 k/ohms, replace FRP sensor. If resistance is 30-40 k/ohms, proceed as follows: If Continuous Memory DTC P0190 is present, go to step 14). If DTC P0192 is present, replace PCM. If DTC P0193 is present, go to next step.
11. 13) Check FRP Circuit For Short To VREF Or VPWR Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 14 and test pins No. 90 (VREF) and 71 (VPWR) at breakout box. If both resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair short circuit.
12. 14) Check For Intermittent Fault Reconnect FRP sensor connector. Turn ignition on. Using scan tool, select FRP V PID from PID/DATA monitor menu. Observe PID voltage for fault while tapping on FRP sensor. Wiggle and bend wiring harness and connector between sensor and PCM. Fault will be indicated by a sudden change in PID voltage. If fault is indicated, isolate and repair as necessary. If fault is not indicated, symptom is intermittent and cannot be located at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) for additional test procedures.
13. 15) Check Fuel Pressure - KOEO/KOER DTC P0191 DTC P0191 indicates the FRP sensor has exceeded the Self-Test Calibration limits and can only be retrieved during KOEO and KOER Self-Test. DTC P0191 (FRP) circuit malfunction low limit is 1.6 volts 138 kPa (20 psi) for gasoline vehicles, or 1.3 volts @ 586 kPa (70 psi) for natural gas and 3.9 volts at 413 kPa (60 psi) for gasoline vehicles, or 3.7 volts @ 724 kPa (130 psi) for natural gas. Continuous DTC P1168 indicates the FRP sensor reading is too low. Continuous DTC P1169 indicates the FRP sensor reading is too high. DTC 1168 low limit is 551 kPa (80 psi). DTC 1169 high limit is 896 kPa (130 psi). Possible causes for this fault are: High fuel pressure. Low fuel pressure. Excessive resistance in circuit. Faulty FRP sensor. Low or no fuel. NOTE: If DTC P0230 or P0231 is present, service these DTCs before proceeding with this test. Turn ignition on. Ensure vehicle has sufficient fuel. Turn ignition off. Release fuel pressure. Connect pressure gauge to Schrader valve. With engine running, check fuel pressure. If the pressure reading within 138 kPa (20 psi) and 413 kPa (60 psi) for gasoline, or 552 kPa (80 psi) and 827 kPa (120 psi) for natural gas vehicles (NG), go to next step. If the pressure reading is not within 138 kPa (20 psi) and 413 kPa (60 psi) for gasoline, or 552 kPa (80 psi) and 827 kPa (120 psi) for natural gas vehicles (NG), go to «CIRCUIT TEST HC»(ref-131243-S35918939922001123100000) for gasoline or CIRCUIT TEST HB for NG.
14. 16) Check FRP PID Fuel Pressure Turn ignition on. Using scan tool, select FRP PID from PID/DATA monitor menu. If PID psi reading is within 10 psi of fuel pressure gauge psi reading in step 15), go to step 18). If PID psi reading is not within 10 psi, repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .
15. 17) Check Fuel Rail Solenoid Using scan tool, access OUTPUT TEST MODE. While observing fuel rail solenoid, cycle output on and off several times. If solenoid clicking can be heard or felt, exit output test mode and go to next step. If no solenoid clicking can be heard or felt, go to step 21).
16. 18) Measure VREF Voltage Disconnect FRP sensor connector. Turn ignition on. Measure voltage between VREF terminal and SIG RTN terminal at FRP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
17. 19) Check FRP Circuit For Excessive Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between FRP terminal at FRP sensor wiring harness connector and test pin No. 14 at breakout box. Measure resistance between SIG RTN terminal at FRP sensor wiring harness connector and test pin No. 91 (SIG RTN) at breakout box. Also, measure resistance between VREF terminal at FRP sensor wiring harness connector and test pin No. 90 at breakout box. If all resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair circuit.
18. 20) Monitor FRP Circuit With Scan Tool Turn ignition on. Using scan tool, select FRP V PID from PID/DATA monitor menu. If PID voltage is less than .2 volt, replace FRP sensor. If PID voltage is not as specified, replace PCM.
19. 21) Check Voltage At Fuel Rail Solenoid Using scan tool, access OUTPUT TEST MODE and select ALL ON. Disconnect fuel rail solenoid connector. Measure voltage between VPWR circuit terminal at fuel rail solenoid wiring harness connector and negative terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit. NOTE: When in output test mode, voltage measurement must be made within 7 seconds of activating test mode.
20. 22) Check Ground Circuit Using scan tool, access OUTPUT TEST MODE and select ALL ON. Measure voltage between VPWR and ground circuit terminals at fuel rail solenoid wiring harness connector and negative terminal. If voltage is more than 10.5 volts, replace fuel rail solenoid. If voltage is 10.5 volts or less, repair open circuit.
21. 23) Check VREF Voltage To FRP Sensor Disconnect FRP sensor connector. Turn ignition on. Measure voltage between VREF and SIG RTN circuit terminals at FRP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF is out of range. Go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
22. 24) Check For Shorted FRP Signal Turn ignition off. Disconnect scan tool Data Link Connector (DLC). Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 14 and test pins No. 90, 91, 24 and 103 at breakout box. If all resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair short circuit.

CIRCUIT TEST DG - KNOCK SENSOR (KS)

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and perform COMPREHENSIVE COMPONENT MONITOR REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS. After drive cycle is completed, repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test only when directed by QUICK TEST. This test is intended to diagnose the following

1. Knock Sensor (KS).
2. Wiring harness circuits (KS and SIG RTN).
3. Powertrain Control Module (PCM).

To prevent replacement of good components, be aware the following non-EEC related areas may be at fault

1. Poor fuel quality.
2. Ignition system.
3. Ignition or valve timing.
4. Engine mechanical condition.

DUAL Knock Sensor Test Circuits & Connector Terminals. Scheme 12

1. 1) Check Knock Sensor Voltage DTC P0325 & P0326 indicate spark knock system failed. Possible causes for these faults are: Open or short in harness. Faulty knock sensor. Faulty Powertrain Control Module (PCM). Turn ignition off. Ensure knock sensor is connected. Perform COMPREHENSIVE COMPONENT MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950). Connect PCM to breakout box. Turn ignition on. Measure voltage between test pins No. 57 and No. 91 (SIG RTN). If voltage is less than.5 volt, go to next step. If voltage is.5 volt or more, go to step 6).
2. 2) Check For Intermittent Circuit Fault Measure voltage test pins No. 57 and 91 at breakout box. While observing voltmeter, wiggle small sections of wiring harness starting at knock sensor working toward PCM. Lightly tap on knock sensor and PCM. If fault is indicated (voltage changes), isolate fault and repair as necessary. If no fault is indicated, go to next step.
3. 3) Check Knock Sensor Resistance Turn ignition off. Disconnect PCM from breakout box. Measure resistance between test pins No. 57 (KS) and 91 (SIG RTN) at breakout box. If resistance is 4.39-5.35 megohms, go to step 8). (Scheme 12) If resistance is more than 5.35 megohms, go to next step. If resistance is less than 4.39 megohms, go to step 5).
4. 4) Check For Open Circuit Disconnect knock sensor connector. Measure resistance between test pin No. 57 and KS terminal at knock sensor wiring harness connector. Note resistance reading. Measure resistance between test pin 91 at breakout box and SIG RTN terminal at knock sensor wiring harness connector. If both resistance readings are less than 5 ohms, replace knock sensor. If any resistance reading is 5 ohms or more, repair open circuit.
5. 5) Check Circuit For Short To Ground Leave knock sensor disconnected. Measure resistance between test pin No. 57 and test pins No. 91, 77 and 103 at breakout box. If resistance is more than 10,000 ohms, replace knock sensor. If resistance 10,000 ohms or less, repair short to ground.
6. 6) Check Circuit For Short To Power Turn ignition on. Measure voltage between test pin No. 57 and test pin No. 77 or 103 at breakout box. If voltage is less than.5 volt, replace PCM. If voltage is.5 volt or more, repair short to power. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 8). No test procedures have been omitted.
7. 8) Check PCM For Short To Ground Turn ignition off. Connect PCM to breakout box. Measure resistance between test pins No. 57 and 91 (SIG RTN) at breakout box. If resistance is more than 10,000 ohms, replace knock sensor. Reconnect all components and repeat «QUICK TEST»(ref-131243-S07493578722001123100000). If fault is still present, replace PCM. If resistance is 10,000 ohms or less, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 8) to step 15). No test procedures have been omitted.
8. 15) Check Knock Sensor Voltage DTCs P0326 (KS1) and P0331 (KS2) indicate spark knock has not been sensed. DTCs P0325 (KS1) and P0330 (KS2) indicate spark knock system failed. Possible causes for these faults are: Open or short in harness. Faulty knock sensor. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950). Connect PCM to breakout box. Turn ignition on. Measure voltage between test pin No. 32 (KS2) or No. 57 (KS1) and test pin No. 91 (SIG RTN). If voltage is 2.2-2.6 volts, go to next step. If voltage is less than 2.2 volts, go to step 18). If voltage is more than 2.6 volts, go to step 20).
9. 16) Check For Intermittent Circuit Fault Measure voltage test pin No. 32 (KS2) or No. 57 (KS1) and test pin No. 91 at breakout box. While observing voltmeter, wiggle small sections of wiring harness starting at knock sensor(s) working toward PCM. Lightly tap on knock sensor and PCM. If fault is indicated (voltage changes), isolate fault and repair as necessary. If no fault is indicated, go to next step.
10. 17) Check For Voltage Increase Turn ignition off. Disconnect scan tool Data Link Connector (DLC). Set voltmeter on AC scale. Start engine and allow to idle. Measure voltage between suspect sensor test pin No. 32 (KS2) or 57 (KS1) and test pin No. 91 at breakout box. Raise engine speed to 3000 RPM. If AC voltage increases, replace PCM. If AC voltage does not increase, go to next step.
11. 18) Check Circuit Resistance Turn ignition off. Disconnect PCM from breakout box. Disconnect suspect knock sensor. Measure resistance of KS circuit (KS1 or KS2) between suspect sensor wiring harness connector and test pin No. 32 (KS2) or 57 (KS1) at breakout box. Measure resistance of SIG RTN circuit between suspect sensor wiring harness connector and test pin No. 91 at breakout box. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit.
12. 19) Check Circuit For Short To Ground Measure resistance between test pin No. 32 (KS2) or 57 (KS1) and test pins No. 91, 77 and 103 at breakout box. Also, measure resistance between test pin No. 32 (KS2) or 57 (KS1) and ground. If both resistance readings are more than 10,000 ohms, replace knock sensor. If any resistance reading is 10,000 ohms or less, repair short circuit.
13. 20) Check Circuit For Short To Power Disconnect PCM from breakout box. Turn ignition on. Measure voltage between test pin No. 32 (KS2) or 57 (KS1) and test pin No. 77 or 103. If voltage is less than.5 volt, replace PCM. If voltage.5 volt or more, repair short to power.

CIRCUIT TEST DH - THROTTLE POSITION (TP) SENSOR

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test only when directed by QUICK TEST. This test is intended to diagnose the following

1. TP sensor.
2. Wiring harness circuits (PWR GND, SIG RTN, TP, VPWR and VREF).
3. Powertrain Control Module (PCM).

Normal range of throttle angle measurement for TP sensor is 0-85 degrees. To pass QUICK TEST procedure, range of throttle rotation (in degrees) must be within 3 percent of specification.

To prevent replacement of good components, be aware the following non-EEC related areas may be at fault

1. Idle speed.
2. Binding throttle shaft or linkage.
3. TP sensor not seated.

TP Sensor Schematic. Scheme 13

Identifying TP Sensor Circuit & Connector Terminals. Scheme 14

1. 1) KOEO/KOER DTC P1124: Check For Other DTCs DTC P1124 indicates TP sensor rotational setting may be out of self-test range. Possible causes for this fault are: Faulty TP sensor. Faulty Powertrain Control Module (PCM). Perform «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) and KOER ON-DEMAND SELF-TEST. Check for DTC P1400. If DTC P1400 is present, go to «CIRCUIT TEST HE»(ref-131243-S00083294452001123100000) . If DTC P1400 is not present with DTC P1124, go to next step.
2. 2) Check For Binding Throttle Plate Inspect throttle body for binding. If throttle body is binding, check for binding throttle or cruise control linkage, vacuum line or harness interference. Repair as necessary. If no mechanical problem is found, go to step 8).
3. 3) DTC P1120: Check Connector Terminals DTC P1120 indicates TP sensor closed throttle position is below range of 3.4 percent (.17 volt) Possible causes for this fault are: Damaged wiring harness or connectors. Open in VREF circuit. Faulty TP sensor. Faulty Powertrain Control Module (PCM). Inspect TP sensor connector for loose, damaged or corroded terminals. Inspect wiring harness between TP sensor and PCM for damage or corrosion. Repair as necessary. If no mechanical problem is found, go to next step.
4. 4) Check For Stuck TP Sensor Turn ignition off. Using scan tool, select TP V PID from PID/DATA monitor menu. While observing TP V PID, slowly move throttle through range from closed to wide open throttle. If PID value indicates any sudden drop to less than .49 volt, go to next step. If PID value increases and decreased gradually and smooth, go to step 20).
5. 5) Check VREF Circuit Voltage Disconnect TP sensor connector. Turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
6. 6) Check TP Circuit Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 89 (TP) and TP terminal of TP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in TP circuit.
7. 7) Check TP Sensor Signal To PCM Connect PCM to breakout box. Start engine and idle for 2 minutes. While slowly opening throttle, measure voltage between test pin No. 89 (TP) and 91 (SIG RTN) at breakout box. If at any time voltage enters .17-.40 volt range, replace TP sensor. If voltage does not enter .17-.40 volt range, repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If DTC P1120 is still present, go to step 20).
8. 8) DTC P0123 Or P0124 These DTCs indicate TP signal is more than self-test maximum. Possible causes for this fault are: TP sensor not seated correctly. Faulty TP sensor. TP circuit shorted to VREF or VPWR. VREF circuit shorted to VPWR. Open in SIG RTN circuit. Faulty PCM. Turn ignition off. Disconnect TP sensor connector. Inspect connector for loose, damaged or corroded terminals. Turn ignition on. Using scan tool, select TP V PID for PID/DATA monitor menu. If PID voltage is .17 volt or more, go to step 10). If PID voltage is less than .17 volt, go to next step.
9. 9) Check VREF Circuit Voltage Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect components and go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
10. 10) Check TP Circuit For Short To Power Turn ignition off. Leave TP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 89 (TP) and test pins No. 71 (VPWR) and 90 (VREF) at breakout box. If any resistance reading is 10,000 ohms or less, repair short circuit. If both resistance readings are more than 10,000 ohms, replace PCM.
11. 11) DTC P0122 This DTC indicates TP signal is less than self-test minimum of .17 volt. Possible causes for this fault are: TP sensor not seated correctly. Faulty TP sensor. Open TP or VREF circuit. TP circuit shorted to SIG RTN or PWR GND. Faulty PCM. NOTE: An intermittent fault can cause a Continuous Memory DTC P0122. If a Continuous Memory DTC P0122 is still present after performing steps 11-14, go to step 20). Turn ignition off. Disconnect TP sensor connector. Inspect connector for loose, damaged or corroded terminals. Connect a jumper wire between VREF and TP terminals at TP wiring harness connector. Turn ignition on. NOTE: If communication link error is displayed, remove jumper wire and go to step 14). Using scan tool, select TP V PID from PID/DATA monitor menu. If PID voltage is more than 4.60 volts, replace TP sensor. If PID voltage is 4.60 volts or less, remove jumper wire and go to next step.
12. 12) Check VREF Circuit Voltage Turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
13. 13) Check TP Circuit Resistance Turn ignition off. Leave TP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 89 (TP) and TP terminal at TP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in TP circuit.
14. 14) Check TP Circuit For Short To SIG RTN Or PWR GND Disconnect scan tool Data Link Connector (DLC). Measure resistance between test pin No. 89 (TP) and test pins No. 91 (SIG RTN), 24 or 103 (PWR GND) at breakout box. If any resistance reading is 10,000 ohms or less, repair TP circuit short to SIG RTN or PWR GND. If both resistance readings are more than 10,000 ohms, replace PCM.
15. 15) Continuous Memory DTC P1121 This DTC indicates TP signal is inconsistent with MAF sensor signal. Possible causes for this fault are: TP sensor not seated correctly. Faulty TP sensor. Air leak between MAF sensor and throttle body. If engine will start, go to next step. If engine is a no-start, check for cracks or openings in air induction system between MAF sensor and throttle body. If air induction system is okay, go to «CIRCUIT TEST A»(ref-131243-S24299898242001123100000) .
16. 16) Check Operation Of TP Sensor Turn ignition on. Using scan tool, select TP V PID from PID/DATA monitor menu. While observing PID V, slowly move throttle through range from closed position to wide open throttle. If PID voltage changes from .53-4.66 volts, go to next step. If PID voltage does not change from .53-4.66 volts, replace TP sensor.
17. 17) Check Operation Of TP Sensor While Driving Vehicle Drive vehicle (vary throttle position) while accessing TP V PID and LOAD PID. If TP V PID voltage is 2.44 volts or less and LOAD PID value is more than 25 percent, go to next step. If TP PID voltage is more than 2.44 volts and LOAD PID value is less than 25 percent, check for cracks or openings in air induction system between MAF sensor and throttle body. If air induction system is okay, replace TP sensor.
18. 18) Check TP Sensor Low With Engine Under Load Start engine and allow to idle. If engine does not start, go to «CIRCUIT TEST A»(ref-131243-S24299898242001123100000) . Drive vehicle (vary throttle position) near higher gears (preferably overdrive) while accessing TP V PID and LOAD PID. If TP V PID is .24 volt or more and LOAD PID is less than 60 percent, fault is intermittent and cannot be duplicated at this time. Testing is complete. If TP V PID is less than .24 volt and LOAD PID is 60 percent or more, tighten TP sensor (if necessary). Clear DTCs. Perform test drive utilizing all phases of vehicle operation. Perform «QUICK TEST»(ref-131243-S07493578722001123100000) . If DTC Continuous Memory P1121 is still present, replace MAF sensor. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 18) to step 20). No test procedures have been omitted.
19. 20) Continuous Memory DTC P1120 Or P1125 These DTCs indicate TP signal went to less than .49 volt or more than 4.60 volts sometime during the last 80 drive cycles. Possible causes for this fault are: Faulty TP sensor wiring harness or connector. Faulty TP sensor. With scan tool connected, start engine and allow to idle. Raise engine speed to 1500 RPM for 5 seconds and return to idle. Using scan tool, select TP V PID from PID/DATA monitor menu. While observing PID, lightly tap on TP sensor to simulate road shock. Wiggle sensor connector and wiring harness. If TP PID voltage stays within normal operating range (.49-4.60 volts), go to next step. If TP PID voltage goes out of range, inspect TP sensor installation. Repair as necessary and retest. If TP sensor installation is okay, replace TP sensor.
20. 21) Check Wiring Harness Between TP Sensor & PCM Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950). Connect PCM to breakout box. Connect DVOM between test pin No. 89 (TP) and 91 (SIG RTN). While observing DVOM, wiggle small sections of wiring harness starting at the TP sensor working toward PCM. If DVOM reading stays within normal operating range (.49-4.60 volts), problem is intermittent and cannot be identified at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . If DVOM reading goes out of range, isolate fault and repair as necessary.
21. 22) DTC P0121: Verify KOER ON-DEMAND SELF-TEST Completion Start engine and allow to idle. Using scan tool, enter «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) . If DTC P0121 is present or KOER ON-DEMAND SELF-TEST cannot be completed, go to next step. If KOER ON-DEMAND SELF-TEST is completed and DTC P0121 is not present, problem is intermittent and cannot be identified at this time.
22. 23) Attempt To Recreate DTC With engine idling, place gear selector in Drive or Reverse. If KOER ON-DEMAND SELF-TEST completes, go to next step. If KOER ON-DEMAND SELF-TEST does not complete, turn ignition off and wait for 15 seconds. Start engine and allow to idle. Enter «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) . If DTC P0121 is present or KOER ON-DEMAND SELF-TEST does not complete, go to next step. If KOER ON-DEMAND SELF-TEST completes and DTC P0121 is not present, problem is intermittent and cannot be identified at this time.
23. 24) Check For Open Circuit Turn ignition off. Disconnect TP sensor connector. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance of TP circuit between TP sensor wiring harness connector and test pin No. 89 at breakout box. Also, measure resistance of SIG RTN circuit between TP sensor wiring harness connector and test pin No. 91 at breakout box. If both resistance readings are less than 5 ohms, replace TP sensor. If any resistance reading is 5 ohms or more, repair open circuit.

CIRCUIT TEST DL - CYLINDER HEAD TEMPERATURE (CHT) SENSOR

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test only when directed by QUICK TEST. This test is intended to diagnose the following

1. Wiring harness circuits (CHT and SIG RTN).
2. Faulty CHT sensor.
3. Faulty Powertrain Control Module (PCM).

Identifying CHT Circuits & Connector Terminals. Scheme 15

CHT SENSOR SPECIFICATIONS

1. 1) DTC P1116 Or P1288 DTC P1116 or P1228 indicates CHT sensor is out of self-test range. Possible causes for these faults are: Engine overheating. Low coolant level. Faulty sensor. Faulty sensor connector. Poor thermostat operation. Start engine and raise speed to 2000 RPM. Ensure upper radiator hose is warm and pressurized. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). Check for DTC P1116 or P1288. If DTC P1116 or P1288 is not present, service remaining faults and repeat «QUICK TEST»(ref-131243-S07493578722001123100000). If DTC P1116 or P1288 is present, go to next step.
2. 2) Check VREF Circuit Voltage Turn ignition off. Disconnect TP sensor connector. Turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. (Scheme 4) If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, reconnect sensor and go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000).
3. 3) Check CHT Sensor Circuit Resistance Turn ignition off. Disconnect CHT sensor. Measure resistance between CHT sensor terminals. See «CHT SENSOR SPECIFICATIONS»(ref-131243-S33850248432001123100000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace CHT sensor.
4. 4) Start engine. Ensure engine is at normal operating temperature. Raise engine speed to 2000 RPM for 2 minutes. Measure resistance between CHT sensor terminals. See «CHT SENSOR SPECIFICATIONS»(ref-131243-S33850248432001123100000) table. If resistance is as specified, replace PCM. If resistance is not as specified, replace CHT sensor.
5. 5) DTC P1289 Or P1290 These DTCs indicate CHT sensor circuit fault. Possible causes for these faults are: Open or grounded circuit. Faulty sensor. Faulty sensor connector. Faulty Powertrain Control Module (PCM). Turn ignition on. Using scan tool, select CHT V PID from PID/DATA monitor menu. If PID voltage is less than.2 volt, go to next step. If PID voltage is.2 volt or more, go to step 7).
6. 6) Check For Grounded Circuit Disconnect CHT sensor connector. Using scan tool, select CHT V PID from PID/DATA monitor menu. If PID voltage is more than 4.6 volts, replace CHT sensor. If PID voltage is 4.6 volts or less, go to step 21).
7. 7) Check For Open Circuit Connect a jumper wire between CHT sensor wiring harness connector terminals. Using scan tool, select CHT V PID from PID/DATA monitor menu. NOTE: If communication link error is displayed, remove jumper wire and go to step 12). If PID voltage is less than.2 volt, replace CHT sensor. If PID voltage is.2 volt or more, remove jumper wire and go to step 11). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 7) to step 10). No test procedures have been omitted.
8. 10) DTC P1118 This DTC indicates CHP sensor signal is more than self-test maximum. Possible causes for this fault are: Open circuit. Faulty CHT sensor. Faulty PCM. Turn ignition off. Disconnect CHT sensor connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect a jumper wire between CHT sensor wiring harness connector terminals. Turn ignition on. NOTE: If communication link error is displayed, remove jumper wire and go to step 12). Using scan tool, select CHT V PID from PID/DATA monitor menu. If PID voltage is less than.2 volt, replace CHT sensor. If PID voltage is.2 volt or more, remove jumper wire and go to next step.
9. 11) Check For Open Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance of CHT circuit between CHT sensor wiring harness connector and test pin No. 66 at breakout box. Also, measure resistance of SIG RTN circuit between CHT sensor wiring harness connector and test pin No. 91 at breakout box. If both resistance readings are less than 5 ohms, replace PCM. If any resistance reading is 5 ohms or more, repair open circuit.
10. 12) Check CHT Signal For Short To VREF Turn ignition off. Disconnect CHT sensor connector. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 66 and 90 at breakout box. If resistance is more than 10,000 ohms, replace PCM. If resistance is 10,000 ohms or less, repair circuit short to VREF. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.
11. 20) DTC P0117 This DTC indicates CHP sensor signal is less than self-test minimum. Possible causes for this fault are: Open or grounded circuit. Faulty CHT sensor. Faulty PCM. Turn ignition off. Disconnect CHT sensor wiring harness connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition on. Using scan tool, select CHT V PID from PID/DATA monitor menu. If PID voltage is more than 4.6 volts, replace CHT sensor. If PID voltage is 4.6 volts or less, remove jumper wire and go to next step.
12. 21) Check VREF Circuit Voltage Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If voltage is 4-6 volts, reconnect TP sensor and go to next step. If voltage is not 4-6 volts, reconnect sensor and go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000).
13. 22) Check Signal Circuit For Short To Ground Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 66 (CHT) and test pins No. 24, 51 (PWR GND) and 91 (SIG RTN) at breakout box. If all resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair circuit short. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 30). No test procedures have been omitted.
14. 30) DTC P1285 This DTC indicates that PCM has sensed an engine overheat condition from CHT sensor. Check cooling system for leaks and restrictions. Check for cause of overheat condition. Repair as necessary. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 30) to step 40). No test procedures have been omitted.
15. 40) Engine Temperature Warning Light Always On, Engine Is Not Overheating If «QUICK TEST»(ref-131243-S07493578722001123100000) was performed and no DTCs are present, go to next step. If QUICK TEST was not performed, perform QUICK TEST and service any DTCs that are present.
16. 41) Engine Temperature Warning Light Always On (No DTCs) This DTC indicates that PCM has sensed a engine warning light circuit fault. Possible causes for this fault are: Faulty instrument cluster. Faulty wiring harness. Faulty PCM. Disconnect PCM 104-pin connector. Turn ignition on. If engine temperature warning light is off and temperature gauge is reading in the normal zone, replace PCM. If engine temperature warning light is still on, check instrument cluster and temperature warning light circuits. See INSTRUMENT PANELS article in the ACCESSORIES & EQUIPMENT section for diagnosis and testing. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 41) to step 90). No test procedures have been omitted.
17. 90) Continuous Memory DTC P0117, P0118, P1117, P1289 Or P1290 These DTCs indicate intermittent CHT sensor failure. Possible causes for these faults are: Open or grounded circuit. Faulty CHT sensor. Low coolant level. Faulty PCM. Turn ignition on. Using scan tool, select CHT PID from PID/DATA monitor menu. While observing CHT PID, lightly tap on CHT sensor to simulate road shock. Wiggle sensor connector. A fault is indicated by a sudden change of CHT PID temperature. If no fault is indicated, go to next step. If fault is indicated, turn ignition off. Disconnect and inspect connectors. If connectors are okay, replace CHT sensor. Clear DTCs and perform COMPREHENSIVE COMPONENT MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000).
18. 91) Check Wiring Harness With CHT PID still selected, wiggle and shake small sections of wiring harness. A fault is indicated by a sudden change of CHT PID temperature. If no fault is indicated, go to next step. If fault is indicated, isolate and repair as necessary. Clear DTCs and perform COMPREHENSIVE COMPONENT MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000).
19. 92) Check PCM Wiring Harness Turn ignition off. Disconnect CHT and PCM connectors. Inspect connectors for loose, damaged or corroded terminals. Repair as necessary. Clear DTCs and perform COMPREHENSIVE COMPONENT MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000). If connectors are okay, problem cannot be located at this time. Clear DTCs and perform COMPREHENSIVE COMPONENT MONITOR REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS. Repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 92) to step 100). No test procedures have been omitted.
20. 100) DTC P1299 This DTC indicates an engine overheat condition was detected by CHT sensor and fail-safe cooling strategy was activated by FMEM. Possible causes for this fault are: Cooling system fault. Low coolant level. Engine mechanical fault. Locate cooling system fault and repair as necessary.

CIRCUIT TEST DP - VEHICLE SPEED SENSOR (VSS)

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and perform OBD-II Drive Cycle. See DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS. After drive cycle is completed, repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Delayed engagement of transmission may be caused by mechanical malfunction. Harsh shifts and/or erratic speedometer reading may be caused by a failed speedometer or an open or intermittent ground within the instrument panel (electronic instrument cluster).

Perform this test when directed by QUICK TEST. This CIRCUIT TEST is intended to diagnose

1. Vehicle Speed Sensor (VSS).
2. VSS wiring harness circuits. (VSS+ and VSS-).
3. Powertrain Control Module (PCM).

Identifying VSS Circuits & Connector Terminals. Scheme 16

1. 1) DTC P0500 Or P0501 These DTCs indicate PCM detected incorrect output from VSS sometime during vehicle operation. Possible causes for these faults are: Faulty VSS. Open or shorted circuit. Faulty PCM. Turn ignition off. Disconnect VSS sensor. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 58 and VSS(+) terminal at VSS wiring harness connector. Measure resistance between test pin No. 33 and VSS(-) terminal at VSS wiring harness connector. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open in VSS circuit.
2. 2) Check VSS Circuits For Shorts To Power Or Ground Turn ignition off. Ensure PCM and VSS are disconnected. Measure resistance at breakout box terminals as follows: Measure resistance between test pins No. 58 and 33. Measure resistance between test pin No. 58 and test pins No. 51 or 103 (PWR GND). Measure resistance between test pins No. 58 and 71 (VPWR). Measure resistance between test pins No. 33 and 71 (VPWR). If all resistance readings are more than 500 ohms, go to next step. If any resistance reading is 500 ohms or less, go to step 12).
3. 3) Check VSS Resistance Measure resistance between VSS terminals. If resistance is not 190-250 ohms, replace VSS. If resistance is 190-250 ohms, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 5). No test procedures have been omitted.
4. 5) DTC P0500 This DTC indicates PCM detected incorrect output from VSS sometime during vehicle operation. Possible causes for this fault are: Faulty VSS. Open or shorted circuit. Faulty PCM. Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-000950), leaving PCM disconnected. Measure voltage between test pins No. 58 and 103 at breakout box while slowly rotating drive wheel. Voltage should fluctuate from less than one volt to more than 5 volts as wheels are rotated. If voltage is as specified, replace PCM. If voltage is not as specified, go to next step.
5. 6) Check VPWR To VSS Turn ignition off. Disconnect VSS connector. Turn ignition on. Measure voltage between VPWR and PWR GND terminals at VSS wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, go to step 10).
6. 7) Check VSS Circuits For Short To Power Turn ignition on. Measure voltage between test pins No. 58 and 103 at breakout box. If voltage is one volt or more, go to step 12). If voltage is less than one volt, go to next step.
7. 8) Check VSS Circuits For Short To Ground Turn ignition off. Measure resistance between test pin No. 58 and 103 at breakout box. If resistance is more than 3000 ohms, go to next step. If resistance is 3000 ohms or less, go to step 12).
8. 9) Check VSS Circuit Resistance Measure resistance between test pin No. 58 and VSS terminal at VSS wiring harness connector. If resistance is less than 5 ohms, replace VSS. If resistance is 5 ohms or more, repair open VSS circuit.
9. 10) Check VSS Ground Circuit Resistance Turn ignition off. Ensure PCM and VSS are disconnected. Measure resistance between chassis ground and PWR GND terminal at VSS wiring harness connector. If resistance is less than 5 ohms, repair open in VPWR circuit to VSS. If resistance is 5 ohms or more, repair open in ground circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 12). No test procedures have been omitted.
10. 12) Verify If Short Is In Wiring Harness Or Another Module Determine if any other modules are connected to VSS circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. If no other modules are connected to vehicle speed circuit, repair short circuit. If other modules are connected to vehicle speed circuit, disconnect module(s) (one at a time) that are associated with VSS circuit. After disconnecting each module, check again for short circuit. Refer to test step that sent you to this step. Repeat until each associated module has been disconnected or short circuit has been eliminated. If short circuit no longer exists with associated module(s) disconnected, diagnose appropriate module and/or related system. See appropriate article in the ACCESSORIES & EQUIPMENT section. If short circuit still exists with all associated modules disconnected, repair short in VSS circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 15). No test procedures have been omitted.
11. 15) KOER DTC P1501: Check PCM VSS PID For Input Signal This DTC indicates VSS input signal is out of range. A DTC 1501 will be set and self-test will abort whenever PCM detects VSS input signal during KOER ON-DEMAND SELF-TEST. Possible cause for this fault is a noisy VSS input signal from RFI/EMI external source (ignition wires, charging circuits etc.). Start engine and allow to idle. Using scan tool, select VSS PID from PID/DATA monitor menu and observe vehicle speed input to PCM. While observing VSS PID, increase engine speed to 2000 RPM and decrease to idle several times. If VSS PID reading is 3 MPH or more, go to step 22). If VSS PID value is less than 3 MPH, fault cannot be duplicated at this time. Clear DTCs and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If DTC P1501 is still present, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 15) to step 20). No test procedures have been omitted.
12. 20) Continuous Memory DTC P0503: Check For Intermittent Fault This DTC indicates poor VSS performance. Possible causes for this fault are: Noisy VSS input signal from RFI/EMI external source (ignition wires, charging circuits etc.). Damaged circuit. Faulty VSS. Faulty VSS gear(s). Turn ignition off. Disconnect VSS sensor. Visually inspect VSS and VSS circuits for potential faults as follows: Loose VSS circuit connectors. Loose VSS circuit connector pins. Damaged VSS wiring harness insulation. Incorrect VSS circuit routing. Incorrect VSS installation. If no faults are found, go to next step. If faults are found, repair as necessary.
13. 21) Check PCM VSS PID For Input Signal Using scan tool, select VSS PID. Test drive vehicle at several steady speeds at more and less than 30 MPH. NOTE: On scan tools with Data Record feature, record data for playback to help identify variations. During each steady speed, check for VSS PID variations of plus (+) or minus (-) 5 MPH for 10 seconds or more. If any variations occur, go to next step. If variations do not occur, fault cannot be duplicated at this time. Testing is complete.
14. 22) Check VSS Wiring Harness Routing Visually inspect VSS wiring harness. Ensure wiring is not routed near ignition wires or alternator wires. Verify VSS wiring harness is shielded and grounded (if applicable). Repeat step 1) to check VSS circuits. If faults are found, repair as necessary. If no faults are found, fault cannot be duplicated at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 25). No test procedures have been omitted.
15. 25) DTC P1500 This DTC indicates PCM detected intermittent input from VSS. Possible causes for this fault are: Intermittent open or shorted circuit. Faulty VSS. Faulty PCM. Turn ignition off. Disconnect VSS sensor. Visually inspect VSS and VSS circuits for potential faults as follows: Loose VSS circuit connectors. Loose VSS circuit connector pins. Damaged VSS wiring harness insulation. Incorrect VSS circuit routing. Incorrect VSS installation. If no faults are found, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . If faults are found, repair as necessary.

CIRCUIT TEST DR - CAMSHAFT POSITION (CMP) SENSOR

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

CMP signal provides PCM information for fuel injector synchronization. The CMP signal originates from Camshaft Position (CMP) sensor.

Enter this CIRCUIT TEST only when instructed during QUICK TEST. This test is only intended to diagnose the following

1. CMP, PWR GND, SIG RTN and VPWR wiring harness circuits.
2. Faulty Camshaft Position (CMP) sensor.
3. Faulty Powertrain Control Module (PCM).

Identifying CMP Circuits & Connector Terminals. Scheme 17

1. 1) DTC P0340 This DTC indicates PCM has detected a CMP sensor circuit fault. Possible causes for this fault are: CMP circuit open or shorted wiring harness. PWR GND or VPWR circuit open (Hall Effect type CMP sensor). SIG RTN circuit open (Variable Reluctance type CMP sensor). Faulty CMP sensor. Faulty PCM. Attempt to start engine. If engine starts, go to next step. If engine does not start, go to «CIRCUIT TEST A»(ref-131243-S24299898242001123100000) .
2. 2) Attempt To Generate DTC P0340 Clear PCM memory. Start engine. Raise engine speed to 1500 RPM for 10 seconds. Return to idle speed. Raise engine speed to 1500 RPM for 10 seconds again. Turn ignition off. Perform «QUICK TEST»(ref-131243-S07493578722001123100000) to retrieve Continuous Memory DTCs. If DTC P0340 is not present, fault is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . If DTC P0340 is present, go to next step (Hall Effect type CMP sensor) or step 5) (Variable Reluctance type CMP sensor).
3. 3) Check VPWR Circuit Voltage Turn ignition off. Disconnect CMP sensor connector. Turn ignition on. Measure voltage between VPWR terminal at CMP sensor wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VREF circuit.
4. 4) Check PWR GND To CMP Sensor Turn ignition off. Measure resistance between PWR GND circuit at CMP sensor wiring harness connector and negative battery terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PWR GND circuit.
5. 5) Check For Open Circuit Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 85 (CID) at breakout box and CMP terminal at CMP sensor wiring harness connector. Also measure resistance as follows: On models with variable reluctance type CMP sensor, measure resistance between test pin No. 91 (SIG RTN) and SIG RTN terminal at CMP sensor wiring harness connector. On all models, if both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit.
6. 6) Check CMP Circuit For Short To Power Ensure CMP sensor is disconnected. Turn ignition on. Measure voltage between test pin No. 85 and test pins No. 51 and 103 (PWR GND) at breakout box. If voltage is less one volt, go to next step. If voltage is one volt or more, repair CMP circuit short to power.
7. 7) Check CMP Circuit For Short To Ground Turn ignition off. Disconnect scan tool Data Link Connector (DLC). Measure resistance between test pin No. 85 and test pins No. 51, 103 (PWR GND) and 91 (SIG RTN) at breakout box. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short to ground or SIG RTN in CMP circuit.
8. 8) Check For Short In PCM Connect PCM to breakout box. Measure resistance between test pin No. 85 and test pins No. 23, 51, 71, 91, 97 and 103 at breakout box. If all resistance readings are more than 500 ohms, go to next step (Variable Reluctance type CMP sensor) or step 10) (Hall Effect type CMP sensor). If any resistance reading is 500 ohms or less, replace PCM.
9. 9) Check CMP Sensor Output Turn ignition off. Reconnect CMP sensor connector. Set DVOM on AC scale to monitor less than 5 volts. Start engine. Measure voltage between test pins No. 85 and 51 while varying engine speed. If voltage varies more than one volt, replace PCM. If voltage does not vary more than one volt, replace CMP sensor.
10. 10) Check CMP Sensor Voltage Output Turn ignition off. Disconnect PCM connector. Ensure CMP sensor is installed properly. Connect DVOM between test pins No. 85 and 51. Using starter, bump engine (do not allow engine to start) for at least 10 engine revolutions. If voltage switches from less than 2 volts to more than 8 volts, replace PCM. If voltage does not switch from less than 2 volts to more than 8 volts, replace CMP sensor.

CIRCUIT TEST DS - AIR CONDITIONING PRESSURE (ACP) SENSOR

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when directed by QUICK TEST. This CIRCUIT TEST is intended to diagnose

1. ACP sensor.
2. ACP wiring harness circuits (ACP, VREF and SIG RTN).
3. Powertrain Control Module (PCM).

Identifying ACP Sensor Test Circuit & Connector Terminals. Scheme 18

1. 1) DTC P1461 This DTC indicates PCM has detected high voltage in ACP circuit. Possible causes for this fault are: Faulty ACP sensor. Open or shorted circuit. Faulty Powertrain Control Module (PCM). Turn ignition on. Using scan tool, select ACP V PID from PID/DATA monitor menu. If PID voltage is 4.9 volts or more, go to next step. If PID voltage is less than 4.9 volts, fault is intermittent. Go to step 18).
2. 2) Check VREF & SIG RTN Circuit Turn ignition off. Disconnect ACP sensor connector. Turn ignition on. Measure voltage between SIG RTN and VREF terminals at ACP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF is out of range or SIG RTN circuit is open. Go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
3. 3) Induce Opposite Signal Turn ignition on. Using scan tool, select ACP V PID from PID/DATA monitor menu. If PID voltage is 4.9 volts or more, go to next step. If PID voltage is less than 4.9 volts, replace ACP sensor. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .
4. 4) Check ACP Circuit For Short To VREF Turn ignition off. Disconnect scan tool Data Link Connector (DLC). Disconnect PCM 104-pin connector. Measure resistance between ACP and VREF terminals at ACP sensor wiring harness connector. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair ACP circuit short to VREF. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .
5. 5) Check ACP Circuit For Short To Power Turn ignition on. Measure voltage between ACP terminal at ACP sensor wiring harness connector and chassis ground. If voltage is less than one volt, replace PCM. If voltage is one volt or more, repair ACP circuit short to power. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .
6. 6) Check Circuit Resistance Turn ignition off. Leave ACP sensor disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 86 (ACP) and ACP terminal at ACP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .
7. 7) Check PCM Connect PCM to breakout box. Leave ACP sensor disconnected. Connect a jumper wire between test pins No. 86 and 91 (SIG RTN) at breakout box. Turn ignition on. Using scan tool, select ACP V PID from PID/DATA monitor menu. If PID voltage is less than 4.9 volts, replace ACP sensor. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If PID voltage is 4.9 volts or more or if scan tool is now unable to communicate, replace PCM. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 7) to step 10). No test procedures have been omitted.
8. 10) DTC P1462 This DTC indicates PCM has detected low voltage in ACP circuit. Possible causes for this fault are: Faulty ACP sensor. Open or shorted circuit. Faulty Powertrain Control Module (PCM). Turn ignition on. Using scan tool select ACP V PID. If PID voltage is .15 volt or less, go to next step. If PID voltage is more than .15 volt, fault is intermittent. Go to step 18).
9. 11) Check VREF Circuit At ACP Sensor Turn ignition off. Disconnect ACP sensor connector. Turn ignition on. Measure voltage between SIG RTN and VREF terminals at ACP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF is out of range. Go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
10. 12) Induce Opposite Signal Turn ignition off. Connect a jumper wire between ACP and VREF terminals at ACP sensor wiring harness connector. Turn ignition on. Using scan tool, select ACP V PID from PID/DATA monitor menu. NOTE: If communication link error is displayed, remove jumper wire and go to next step. If PID voltage is 4 volts or less, go to next step. If PID voltage is more than 4 volts, replace ACP sensor. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .
11. 13) Check ACP Circuit For Short To Ground Or SIG RTN Turn ignition off. Disconnect scan tool Data Link Connector (DLC). Disconnect PCM 104-pin connector. Measure resistance between ACP and SIG RTN terminals at ACP sensor wiring harness connector. Also, measure resistance between ACP terminal at ACP sensor wiring harness connector and negative battery terminal. If both resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short circuit. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .
12. 14) Check ACP Circuit Resistance Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 86 (ACP) at breakout box and ACP terminal at ACP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ACP circuit. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .
13. 15) Check A/C Clutch Engagement Turn ignition on. Reconnect ACP sensor. Turn A/C switch on while listening for A/C clutch engagement. If A/C clutch engages when A/C switch is turned on, replace PCM. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If A/C clutch does not engage when ignition is turned on, go to next step.
14. 16) Check Refrigerant Charge Reconnect all components. Connect A/C manifold gauge set and check if A/C system has correct refrigerant charge. Service A/C system if necessary. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If A/C system has correct refrigerant charge, replace PCM. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 18). No test procedures have been omitted.
15. 18) Check Wiring Harness & Sensor Turn ignition on. Using scan tool, select ACP V PID from PID/DATA monitor menu. While observing ACP V PID, lightly tap on ACP sensor to simulate road shock. Wiggle sensor connector and wiring harness. A fault is indicated by a sudden change of PID voltage. If fault is indicated, isolate and repair as necessary. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If no faults are indicated, unable to duplicate fault at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 18) to step 20). No test procedures have been omitted.
16. 20) DTC P1463 This DTC indicates PCM has detected that ACP sensor did not detect sufficient change in A/C system pressure when A/C switch was turned on. Possible causes for this fault are: A/C system mechanical malfunction. A/C system electrical malfunction (non-EEC related). A/C clutch continuous engagement. ACP or VREF open circuit. Faulty ACP sensor. Turn A/C and defroster off. Start engine and allow to idle. Verify A/C clutch disengages. If A/C clutch disengaged, go to next step. If A/C clutch did not disengage, check A/C clutch circuit. See CLIMATE CONTROL (A/C ALWAYS ON) in TESTS W/O CODES - EEC-V article. Repair as necessary.
17. 21) Check Power & Ground To A/C Clutch Turn ignition off. Disconnect A/C cycling switch. Connect a jumper wire between A/C cycling switch connector terminals. Disconnect A/C clutch. Connect non-powered test light between power and ground terminals at A/C clutch wiring harness connector. Start engine and allow to idle. Turn A/C switch on. Monitor test light for 15 seconds. If test light comes on or A/C clutch can be heard clicking, go to next step. If test light does not come on or A/C clutch cannot be heard clicking, go to «CIRCUIT TEST KM»(ref-131243-S08299686702001123100000) , step 15).
18. 22) Check ACP V PID Start engine. Ensure A/C is off. Using scan tool, access ACP V PID from PID/DATA monitor menu. Note A/C V PID voltage reading. Monitor PID value and turn A/C on. Note PID voltage reading within 5 seconds of A/C clutch engagement and compare reading with PID reading noted previously. If PID voltage change is more than .3 volt, no problem is indicated at this time. If PID voltage change is not more than .3 volt, check A/C system for proper operation. Repair as necessary.
19. 23) Check Refrigerant Charge Reconnect all components. Connect A/C manifold gauge set. With A/C off, note high pressure reading. Turn A/C on and within 5 seconds, note high pressure reading. If high pressure reading changes more than 30 psi (207 kPa), go to next step. If high pressure reading does not change more than 30 psi (207 kPa), service A/C system if necessary. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .
20. 24) Check VREF Circuit At ACP Sensor Turn ignition off. Disconnect ACP sensor connector. Turn ignition on. Measure voltage between SIG RTN and VREF terminals at ACP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF is out of range. Go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
21. 25) Check ACP Circuit Resistance Turn ignition off. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 86 (ACP) at breakout box and ACP terminal at ACP sensor wiring harness connector. If resistance is less than 5 ohms, replace ACP sensor. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If resistance is 5 ohms or more, repair open in ACP circuit. Start engine and turn A/C on for 15 seconds. Turn A/C off and repeat QUICK TEST.

CIRCUIT TEST FB - POWER TAKE OFF (PTO)

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test only when directed here. This CIRCUIT TEST is intended to diagnose

1. PTO wiring harness circuit.
2. Powertrain Control Module (PCM).

Identifying PT0 Test Circuit & Switch Schematic. Scheme 19

1. 1) Check PTO Switch PTO signals PCM that additional load is being applied to engine. If PTO circuit failure occurs, a DTC may be set. Possible causes for this fault are: PTO circuit shorted to power. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect PTO switch connector. Measure resistance between PTO switch terminals. With switch off, resistance should be more than 10,000 ohms. With switch on, resistance should be less than 5 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace PTO switch. Perform OBD-II DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS.
2. 2) Check For Short To Power Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition on. Measure voltage between test pin No. 4 and test pin No. 51 or 103 at breakout box. If voltage is less than one volt, reconnect PCM and PTO switch connectors and go to next step. If voltage is one volt or more, repair circuit short to power.
3. 3) MIL On: Check PTO PID Turn ignition off. Connect scan tool to DLC. Turn ignition on. Using scan tool, select PTO PID from PID/DATA monitor. NOTE: Some vehicles do not support a PTO PID. If PTO PID is available and displaying ON or OFF, go to next step. If PTO PID is not as specified, go to step 9). NOTE: The following step requires operating PTO. Refer to PTO manufacturer of PTO for operating instructions.
4. 4) Check PTO Circuit With Scan Tool Turn ignition on. Engine may need to be started to engage PTO. Cycle PTO switch/handle while observing PTO PID. If PID cycled ON, delay, then turned ON, PTO input is okay. Check for additional symptoms and repair as necessary. If PID value is not as specified, go to next step.
5. 5) Check PTO Circuit For Short To Ground Turn ignition off. Disconnect PTO switch connector. Disconnect scan tool from Data Link Connector (DLC). Measure resistance between test pin No. 4 and test pin No. 77 or 103 at breakout box. If resistance is 10,000 ohms or less, repair short circuit. If resistance is more than 10,000 ohms, go to step 7). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 7). No test procedures have been omitted.
6. 7) Reconnect PCM to breakout box. Connect scan tool to DLC. Connect a jumper wire between positive battery terminal and PTO terminal at PTO switch wiring harness connector. Turn ignition on. Using scan tool, select PTO PID. PID value should be ON with jumper wire and OFF with jumper wire disconnected. If PID value is as specified, PTO circuit from PTO switch to PCM is okay. Refer to PTO manufacturer for service information of PTO. If PID value is not as specified, go to next step.
7. 8) Check Circuit Resistance Turn ignition off. Disconnect PCM from breakout box. Measure resistance between test pin No. 4 and PTO terminal at PTO switch wiring harness connector. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in PTO circuit.
8. 9) Perform KOEO & KOER Self-Test Perform «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) and KOER ON-DEMAND SELF-TEST. If any DTCs are present, service DTC as necessary. If no DTCs are present, go to next step.
9. 10) Perform Drive Cycle Ensure PTO is disengaged. Perform OBD-II DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. Retrieve Continuous Memory DTCs. If any DTCs are present, service DTCs as necessary. If no DTCs are present, fault cannot be duplicated at this time. MIL on can be caused by engaging PTO, creating an engine load while OBD-II monitors were running. If symptom is still present, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) .

CIRCUIT TEST FD - BRAKE PEDAL POSITION (BPP) SWITCH

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when directed by QUICK TEST. This test is intended to diagnose a faulty BPP switch, circuit or PCM. To prevent replacement of good components, be aware following non-EEC related areas may be at fault

1. Brakelight bulb.
2. Brakelight switch or brakelight fuse.

Note. Brake Pedal Position (BPP) switch is also referred to as a Brake On/Off (BOO) switch.

Note. PCM receives Brake Pedal Position (BPP) information through the Standard Corporate Protocol (SCP) link. This circuit test will only verify that self-test was performed correctly. For wiring identification, see appropriate wiring diagram in WIRING DIAGRAMS article.

1. 1) KOER DTC P0703 Or P1703: Verify Brake Pedal Was Depressed These DTCs indicate that when brake pedal was applied during KOER ON-DEMAND SELF-TEST, BPP signal did not cycle high and low. Possible causes for this fault are: Brake pedal not applied during self-test. Brake pedal applied during entire self-test. Open or short brakelight circuit. Open or short BPP circuit. Faulty BPP switch. Faulty Lighting Control Module. Faulty Powertrain Control Module (PCM). If brake was not applied and released during «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) , repeat test. Depress and release brake pedal only once during test. If pedal was applied and released, diagnose Lighting Control Module (LCM) and/or related system. See appropriate article in the ACCESSORIES & EQUIPMENT section.
2. 2) KOEO DTC P0703 Or P1703 These DTCs indicate that BPP signal voltage was high during KOEO ON-DEMAND SELF-TEST. Possible causes for these faults are: Brake pedal applied during self-test. Open or short BPP circuit. All brakelights open. Faulty brakelight ground. Faulty BPP switch. If brake was applied during «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) , repeat test. DO NOT apply brake during self-test. If pedal was not applied, diagnose Lighting Control Module (LCM) and/or related system. See DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS in appropriate MODULE COMMUNICATIONS NETWORK article in the ACCESSORIES & EQUIPMENT section to determine articles that are associated with LCM module. Repair system or replace module as necessary. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 2) to step 4). No test procedures have been omitted.
3. 4) Check For BPP PID Cycling Turn ignition on. Using scan tool, select BPP PID from PID/DATA monitor menu. While observing PID, apply and release brake several times. NOTE: If BPP PID is not available, go to step 10). If PID does not cycle ON and OFF, go to step 10). If PID cycles ON and OFF, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) , step 10).
4. 5) Check For Power To BBP Switch Ensure related fuses and brakelight bulbs are good. Disconnect BPP switch (located on brake pedal). Measure B+ input voltage between BPP switch wiring harness connector and chassis ground. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in B+ circuit to BPP switch.
5. 6) Check BPP Switch Depress brake pedal. Measure resistance between BPP switch terminals. If resistance is 5 ohms or more, replace BPP switch. If resistance is less than 5 ohms, repair open circuit between BPP switch and brakelight ground.
6. 7) Verify BPP Switch Is Not Always Closed Ensure ignition is off. Disconnect BPP switch (located on brake pedal). Turn ignition on. If brakelights are still on, go to next step. If brakelights are off, verify correct installation of BPP switch. If installation is okay, replace BPP switch.
7. 8) Check For Short To Power In PCM Turn ignition off. Disconnect PCM 104-pin connector. Turn ignition on. Check brakelights. If brakelights are still on, go to next step. If brakelights are off, replace PCM.
8. 9) Check For Short To Power Turn ignition off. Ensure PCM and BPP switch are disconnected. One at a time, disconnect all modules associated with brakelight circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. After disconnecting each module, turn ignition on and check brakelights. Turn ignition off. Repeat until each associated module has been disconnected or brakelights turn off. If brakelights are still on after disconnecting all associated modules, repair short to power in BPP circuit. If brakelights are off with associated module(s) disconnected, diagnose appropriate module and/or related system. See DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS in MODULE COMMUNICATIONS NETWORK article in the ACCESSORIES & EQUIPMENT section to determine articles that are associated with module that was disconnected to eliminate short to power. Repair system or replace module as necessary.
9. 10) Check For BPP Circuit Cycling Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure voltage between test pin No. 92 and chassis ground while applying and releasing brake. If voltage cycles on and off, replace PCM. If voltage does not cycle, repair open in BPP circuit between PCM and BPP circuit connection to brakelight B+ circuit.

CIRCUIT TEST FF - POWER STEERING PRESSURE (PSP) SWITCH

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Some vehicles may not have power steering, but PCM may be equipped with PSP switch software strategy. If a KOEO DTC P1650 or P1651 is displayed, check if vehicle is equipped with power steering. If vehicle is not equipped with power steering, disregard DTC P1650 or P1651.

This test is only intended to diagnose

1. Wiring harness circuits (SIG RTN and PSP).
2. PSP switch.
3. Powertrain Control Module (PCM).

Identifying PSP Circuits & Connector Terminals. Scheme 20

1. 1) DTC P1650 Or P1651 DTC P1650 indicates PSP signal is out of self-test range. DTC P1651 indicates PSP signal malfunction. Possible causes for these faults are: Open or short in wiring harness. Faulty PSP switch. Faulty PSP switch/shorting bar damage. Faulty Powertrain Control Module (PCM). Start engine and allow to idle. Using scan tool, select PSP PID from PID/DATA monitor menu. Observe PID and turn steering wheel left, then right. If PID value does not indicate a change, go to next step. If PID value indicates a change, unable to duplicate or identify fault. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) .
2. 2) Check PSP Switch Operation Turn ignition off. Disconnect PSP switch connector. Install a jumper wire between PSP switch wiring harness connector. Start engine and allow to idle. Record PID reading. Disconnect jumper wire and record PID reading. If PSP PID changed from high to low, replace PSP switch. If PID value did not change as specified, go to next step.
3. 3) Check PSP Circuit Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance of PSP circuit between test pin No. 31 at breakout box and PSP terminal at PSP switch wiring harness connector. Also, measure resistance of SIG RTN circuit between test pin No. 91 at breakout box and SIG RTN terminal at PSP switch wiring harness connector. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open in PSP or SIG RTN circuit.
4. 4) Check For Short In PSP Circuit Measure resistance between test pins No. 31 and 91 at breakout box. Also, measure resistance between test pin No. 31 and chassis ground. If both resistance readings are 10,000 ohms or more, replace PCM. If any resistance reading is less than 10,000 ohms, repair short circuit.

Enter this test when directed by QUICK TEST. This test is only intended to diagnose

1. Harness circuits (SIG RTN and OCT ADJ).
2. Octane adjust shorting bar connector.

Purpose of Octane Adjust Shorting Bar is to provide optimum spark advance for fuel used. If engine detonates (spark knock), remove Octane Shorting Bar. This retards spark advance about 3-4 degrees. If engine continues to detonate, use fuel with a higher octane rating.

Identifying Octane Adjust Shorting Bar Connector. Scheme 21

Identifying Octane Adjust Circuits. Scheme 22

1. 1) DTC P1390 This DTC indicates Octane Adjust (OCT ADJ) shorting bar is not in place or OCT ADJ circuit is open. Turn ignition off. Inspect octane adjust shorting bar connector. If shorting bar has been removed, go to next step. If shorting bar is in place, go to step 4).
2. 2) Check For Modification Decal If vehicle has modification decal indicating OCT ADJ shorting bar was removed as a factory authorized procedure, testing is complete. If engine has spark knock, check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article. If vehicle does not have modification decal, go to next step.
3. 3) Check For DTC P1390 Replace OCT ADJ shorting bar. Perform «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) . If DTC P1390 is present, go to next step. If DTC P1390 is not present, testing is complete.
4. 4) Check Octane Adjust Circuit Resistance Continuity should exist from OCT ADJ circuit, through octane adjust shorting bar connector and shorting bar to SIG RTN circuit. Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 30 and 91 at breakout box. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open OCT ADJ circuit, shorting bar or SIG RTN circuit.
5. 5) Check For DTC P1390 Start engine. Allow engine to reach normal operating temperature. Turn ignition off. Perform «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) . If DTC P1390 is not present, go to next step. If DTC P1390 is present, return to step 1).
6. 6) Verify Shorting Bar Is Installed Turn ignition off. Inspect octane adjust shorting bar connector. If shorting bar is in place, go to step 8). If shorting bar has been removed, go to next step.
7. 7) Check For Modification Decal If vehicle has modification decal indicating OCT ADJ shorting bar was removed as a factory authorized procedure, go to step 10). If vehicle does not have a modification decal, replace shorting bar. If engine has spark knock, check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article.
8. 8) Check For Technical Service Bulletin (TSB) If a TSB authorizing removal of OCT ADJ shorting bar exists, go to next step. If authorizing TSB does not exist, testing is complete. If engine has spark knock, check for additional symptoms and repair as necessary. Go to TESTS W/O CODES - EEC-V article.
9. 9) Remove OCT ADJ Shorting Bar Turn ignition off. Remove OCT ADJ shorting bar. Test drive vehicle to verify complaint. If spark knock is present, go to next step. If spark knock is not present, testing is complete.
10. 10) Check Octane Adjust Circuit For Short To Ground Turn ignition off. Disconnect 104-pin PCM connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between OCT ADJ terminal at octane adjust shorting bar connector and test pins No. 51, 91 and 103 at breakout box. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short to ground. If engine still has spark knock, check for additional symptoms and repair as necessary. Go to TESTS W/O CODES - EEC-V article.
11. 11) Check PCM Connect PCM to breakout box. Turn ignition on. Measure voltage between test pin No. 30 and test pins No. 51 and 103 at breakout box. If voltage is 4 volts or less, replace PCM. If engine still has spark knock, check for additional symptoms and repair as necessary. Go to TESTS W/O CODES - EEC-V article. If voltage is more than 4 volts, remove breakout box. If engine still has spark knock, check for additional symptoms and repair as necessary. Go to TESTS W/O CODES - EEC-V article.

CIRCUIT TEST H - FUEL CONTROL

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Only use this test to diagnose the following

1. HO2S and sensor connection.
2. Vacuum systems.
3. Fuel injector and/or fuel injector circuitry.
4. Powertrain Control Module (PCM).
5. Electrical circuits (HO2S, HO2S GND, INJ 1-8, VPWR and SIG RTN).

Note. HO2S may be displayed on scan tool as 02S.

To prevent replacement of good components, be aware the following non-EEC areas may be cause of driveability concerns

1. Ignition system.
2. Faulty evaporative emission system.
3. EGR and/or PCV system.
4. Air intake system.
5. Engine oil contamination.
6. Fuel system.
7. Exhaust system leaks or restriction.
8. Engine cooling system.

Identifying HO2S Connector Terminal. Scheme 23

Identifying Fuel Injector Connector Terminals. Scheme 24

Locating HO2S (With Dual Exhaust). Scheme 25

Locating HO2S (With Single Exhaust). Scheme 26

Note. Test procedure begins with step 20). No test procedures have been omitted.

1. 20) Perform KOER Self-Test Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P1127, P1128 or P1129 is present, go to appropriate circuit test. See «DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART»(ref-131243-S33178436662001123100000). If DTC P1127, P1128 or P1129 is not present, go to next step.
2. 21) DTC P0133 & P0153 This DTC indicates that response rate is below calibration in HO2S as follows: DTC P0133 for right front HO2S. DTC P0153 for left front HO2S. Possible causes are: Open or shorted circuit. Exhaust leak. Excessive fueling. HO2S coated with contaminants. Faulty MAF sensor. Leak in air induction system. Turn ignition on. Using scan tool, access GENERIC OBD-II FUNCTIONS and enter. Select DIAGNOSTIC MONITORING TEST RESULTS and enter. Scroll to TEST ID: 01 and enter. Press START. If measured value is 614 or less, go to next step. If measured value is more than 614, fault cannot be duplicated or identified at this time and testing is complete. Perform HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE. See FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE under «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. Repeat step 20). If DTC P1127, P1128 or P1129 is not present, testing is complete.
3. 22) Check For HO2S Contamination Check following possibilities as potential source of contamination: Use of unapproved silicon sealers. Use of unapproved cleaners. Fuel contaminated by silicon additives. Fuel contaminated by lead. Excessive oil burning. Antifreeze leaking internally. If none of these conditions are present, go to next step. If any of these conditions are present, repair source of contamination as necessary. Replace HO2S. Change oil, filter. Perform HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE. See FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE under «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS.
4. 23) Check For Unmetered Air Leaks Vacuum or air leaks in non-EEC-V areas could cause fault code to set. Check the following as potential source of air leak: Leaking vacuum hoses. Leaking intake manifold gasket. EGR system. PCV system. Poorly seated oil dip stick and/or dipstick tube. If none of these conditions are present, go to next step. If any of these conditions are present, repair source of air leak as necessary. Perform HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE. See FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE under «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS.
5. 24) Check HO2S Circuits Turn ignition off. Disconnect suspect HO2S wiring harness connector. Connect a jumper wire between HO2S SIG and VPWR terminals at suspect HO2S wiring harness connector. Turn ignition on. Using scan tool, select appropriate HO2S PID from PID/DATA monitor menu. If PID voltage is 1.5 volts or less, remove jumper wire and go to next step. If PID voltage is more than 1.5 volts, replace HO2S and change engine oil. Perform HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE. See FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE under «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS.
6. 25) Check HO2S Signal Circuit Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance of HO2S SIG circuit between suspect HO2S test pin at breakout box and HO2S SIG terminal at HO2S wiring harness connector. See HO2S TEST PIN IDENTIFICATION table. Also, measure resistance between test pin No. 91 at breakout box and SIG RTN terminal at suspect HO2S wiring harness connector. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit. Perform HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE. See FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE under «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. HO2S TEST PIN IDENTIFICATION (1) Application HO2S SIG Test Pin No. HO2S HTR Test Pin No. HO2S-11 60 93 HO2S-12 35 95 HO2S-21 87 94 HO2S-22 61 96 (1) SIG RTN circuit is test pin No. 91. VPWR circuit is test pin No. 71 and 97.
7. 26) Check HO2S For Short Circuit Disconnect scan tool from Data Link Connector (DLC). Measure resistance between test pin No. 71 (VPWR) and appropriate HO2S SIG test pin at breakout box as follows: HO2S 11, HO2S SIG test pin No. 60. HO2S 21, HO2S SIG test pin No. 87. Refer to illustrations for HO2S identification. (Scheme 25)or (Scheme 26). Also, measure resistance between appropriate HO2S SIG test pin and test pin No. 91 (SIG RTN) at breakout box. If all resistance readings are more than 10,000 ohms, replace PCM. Perform HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE. See FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE under «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If any resistance reading is 10,000 ohms or less, repair short circuit. Perform HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE. See FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE under DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS.
8. 27) DTC P0131 & P0151: Contaminated HO2S/Voltage Shift These DTCs are set when HO2S generates negative voltage. Possible causes are: Crossed HO2S SIG / SIG RTN circuit wiring. HO2S contaminated with water, fuel, etc. Check for moisture in HO2S connector and repair as necessary. If connector is dry, go to next step.
9. 28) Check HO2S For Short Circuit Ensure ignition is off. Disconnect suspect HO2S. Disconnect PCM 104-pin connector. Inspect connectors for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 60 (DTC P0131) or No. 87 (DTC P0151) at breakout box and HO2S SIG and SIG RTN terminals at suspect HO2S wiring harness connector. If both resistance readings are less than 5 ohms, replace HO2S. If any resistance reading is 5 ohms or more, repair open circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 28) to step 30). No test procedures have been omitted.
10. 30) DTC P0135, P0141, P0155 Or P0161 DTCs received separately indicate a short to ground or open circuit in HO2S heater circuit. DTCs received in pairs, such as P0135 and P0155 or P0141 and P0161, indicate HO2S heater circuit is shorted to a power source of more than 2 volts. DTC P0135 is for HO2S 11. DTC P0155 for HO2S 12. DTC P0141 for HO2S 21. DTC P0161 for HO2S 22.. Refer to illustrations for HO2S identification. (Scheme 25)or (Scheme 26). Possible causes are: Signal shorted in wiring harness or HO2S. Water in connectors. Cut or pulled wires. Open in GND or VPWR circuit. Corroded terminals. Faulty HO2S heater. Inspect HO2S connectors for loose, damaged or corroded terminals. Repair as necessary. If HO2S connectors are okay, go to next step.
11. 31) Perform KOEO Self-Test Start engine and operate at 2000 RPM for one minute. Turn ignition off. Perform «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000). If DTC P0135, P0141, P0155 or P0161 is present, go to next step. If specified DTCs are not present, fault is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).
12. 32) Check For Voltage At HO2S Heater Wiring Harness Connector Turn ignition off. Disconnect suspect HO2S. Inspect wiring harness for damage and repair as necessary. Turn ignition on. Measure voltage between SIG RTN and VPWR terminals at suspect HO2S wiring harness connector. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, go to step 34).
13. 33) Check For Open VPWR Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance of VPWR circuit between VPWR terminal at suspect HO2S wiring harness connector and test pin No. 71 at breakout box. If resistance is less than 4 ohms, go to next step. If resistance is 4 ohms or more, check circuit fuse. If fuse is okay, repair open circuit.
14. 34) Check HO2S Heater Resistance Turn ignition off. With suspect sensor disconnected, measure resistance between HO2S HTR terminal and VPWR terminal at suspect HO2S. If resistance is 3-30 ohms, go to next step. If resistance is not 3-30 ohms, replace HO2S.
15. 35) Check For Short Circuit Measure resistance between HO2S HTR terminal at HO2S and HO2S case. Measure resistance between HO2S HTR terminal and SIG RTN terminal at HO2S. Also, measure resistance between VPWR terminal at HO2S and HO2S case. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, replace HO2S.
16. 36) Check For Short Circuit Disconnect scan tool from DLC. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins at breakout box as indicated: DTC P0135, test pin No. 93 and test pins No. 24, 91, 97 and 103. DTC P0141, test pin No. 95 and test pins No. 24, 91, 97 and 103. DTC P0155, test pin No. 94 and test pins No. 24, 91, 97 and 103. DTC P0161, test pin No. 96 and test pins No. 24, 91, 97 and 103. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short circuit.
17. 37) Leave ignition off and sensor disconnected. Measure resistance between HO2S HTR terminal at suspect HO2S wiring harness connector and appropriate HO2S HTR test pin at breakout box as follows: HO2S HTR 11, test pin No. 93. HO2S HTR 12, test pin No. 95. HO2S HTR 21, test pin No. 94. HO2S HTR 22, test pin No. 96. Refer to illustrations for HO2S identification. (Scheme 25)or (Scheme 26). If resistance is 4 ohms or more, repair open circuit or excessive resistance in wiring harness. If resistance is less than 4 ohms, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 37) to step 40). No test procedures have been omitted.
18. 40) DTC P1130, P1150, P1131, P1151, P1132 Or P1152: HO2S Not Switching DTCs P1131 and P1151 indicate air/fuel ratio is correcting rich for an overly lean condition. DTCs P1132 and P1152 indicate air/fuel ratio is correcting lean for an overly rich condition. DTCs P1130 and P1150 indicate fuel system has reached maximum compensation and HO2S is not switching at the adaptive limits. Possible causes are: Fuel system malfunction. EGR system malfunction. Air intake or vacuum system leak. Engine oil level too high. Incorrect cam timing. Restricted air cleaner. Faulty PCV system. Excessive internal engine wear. Inspect engine for obvious defects in specified systems. Repair as necessary. If no faults are found, go to next step.
19. 41) DTC P0171, P0172, P0174 Or P0175: HO2S Not Switching DTCs P0171 and P0174 indicate air/fuel ratio is correcting rich for an overly lean condition. DTCs P0172 and P0175 indicate air/fuel ratio is correcting lean for an overly rich condition. Possible causes are: Fuel system malfunction. EGR system malfunction. Air intake or vacuum system leak. Engine oil level too high. Incorrect cam timing. Restricted air cleaner. Faulty PCV system. Excessive internal engine wear. Inspect engine for obvious defects in specified systems. Repair as necessary. If no faults are found, go to next step.
20. 42) Perform KOER Self-Test Turn ignition off. Connect scan tool to DLC. Disconnect fuel vapor hose from intake manifold and plug fitting at intake manifold. Start engine, and operate at 2000 RPM for 5 minutes. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) and proceed as follows: If DTCs P1127, P1128 or P1129 are present, go to appropriate CIRCUIT TEST. See «DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART»(ref-131243-S33178436662001123100000). If DTC P0131 or P0151 is present in continuous memory, go to step 27). If DTC P1130, P1131, P1150 or P1151 is present, go to step 43). If DTC P1130, P1132, P1150 or P1152 is present, go to step 49). If none of these DTCs are present, proceed as follows: If Continuous Memory DTC P1130, P1150, P0171, P0172, P0174 or P0175 is present, go to step 52). If DTC P1132 or P1152 is no longer present, go to «CIRCUIT TEST HX»(ref-131243-S14911163472001123100000), step 22). If DTC P1131 or P1151 is no longer present, go to «CIRCUIT TEST HX»(ref-131243-S14911163472001123100000), step 58). On all others without reoccurring DTCs, fault is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).
21. 43) HO2S Circuit Test (With Lean DTCs) Disconnect suspect HO2S. Turn ignition on. Using scan tool, select appropriate HO2S PID from PID/DATA monitor menu. Connect a jumper wire between HO2S SIG and VPWR terminals at suspect HO2S wiring harness connector. If spark occurs, remove jumper wire and go to step 47). If HO2S voltage is more than 1.3 volts, go to next step. If voltage is 1.3 volts or less, go to step 46).
22. 44) Check Circuit Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950). Connect PCM to breakout box. Measure resistance between negative battery terminal and SIG RTN terminal at suspect HO2S wiring harness connector. If resistance is less than 5 ohms, go to step 52). If resistance is 5 ohms or more, go to next step.
23. 45) Check For Open Circuit Turn ignition off. Disconnect PCM from breakout box. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal at suspect HO2S wiring harness connector. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open circuit.
24. 46) Check Resistance Of HO2S SIG & Ground Circuits Turn ignition off. Install breakout box, leaving PCM disconnected. Disconnect suspect HO2S connector. Inspect connectors for loose, damaged or corroded terminals. Repair as necessary. Measure resistance of HO2S SIG circuit between HO2S SIG terminal at suspect HO2S wiring harness connector and appropriate HO2S SIG test pin at breakout box as follows: HO2S 11, test pin No. 60. HO2S 21, test pin No. 87. Refer to illustrations for HO2S identification. (Scheme 25)or (Scheme 26). Also, measure resistance between SIG RTN terminal at suspect HO2S wiring harness connector and test pin No. 91 at breakout box. If all resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit.
25. 47) Check HO2S Circuit For Short To Ground Measure resistance between test pins No. 24, 51, 77, 91 and 103 and appropriate HO2S SIG test pin at breakout box as follows: HO2S 11, test pin No. 60. HO2S 21, test pin No. 87. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short circuit.
26. 48) Check HO2S For Short To Ground Reconnect HO2S connector. Measure resistance between test pins No. 91 and 103 and appropriate HO2S SIG test pin at breakout box as follows: HO2S 11, test pin No. 60. HO2S 21, test pin No. 87. If any resistance reading is 10,000 ohms or less, replace HO2S. If all resistance readings are more than 10,000 ohms, replace PCM.
27. 49) Check HO2S PID Ensure ignition is off. Disconnect suspect HO2S connector. Turn ignition on. Using scan tool, select appropriate HO2S PID from PID/DATA monitor menu. If PID voltage is more than.2 volt, go to next step. If PID voltage is.2 volt or less, go to step 51).
28. 50) Check For Short To Power Turn ignition off. Disconnect scan tool from DLC. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between the following test pins at breakout box: DTC P01130 and P01132 - Measure resistance between test pin No. 60 and test pins No. 71 and 93. DTC P01150 and P01152 - Measure resistance between test pin No. 87 and test pins No. 71 and 94. If all resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair short to power.
29. 51) Check For Shorted HO2S Ensure suspect HO2S is disconnected. Turn ignition on. Using scan tool, select appropriate HO2S PID from PID/DATA monitor menu. If PID voltage is more than.45 volt, replace HO2S. If PID voltage is.45 volt or less, reconnect all connectors and go to next step.
30. 52) Check Fuel Pressure Release fuel system pressure. See REMOVE/INSTALL/OVERHAUL article. With ignition off, install fuel pressure gauge. Using scan tool, access OUTPUT TEST MODE. Command fuel pump on. Note fuel pressure. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123324) article. If fuel system pressure is not as specified, go to «CIRCUIT TEST HC»(ref-131243-S35918939922001123100000). If fuel system pressure is as specified, go to step 55).
31. 53) Check System Ability To Hold Fuel Pressure With fuel pressure gauge installed, cycle ignition from OFF to ON position 3-4 times to pressurize fuel system (DO NOT start engine). If fuel pressure does not remain within 5 psi (34 kPa) of maximum pressure after one minute, go to «CIRCUIT TEST HC»(ref-131243-S35918939922001123100000), step 5). If fuel pressure remains within 5 psi (34 kPa) of maximum pressure reading for one minute, proceed as follows: For no-start vehicles, go to step 55). For DTCs P1130, P01150, P0171, P0172, P0174 and P0175, go to next step. For HO2S DTCs displayed with misfire DTCs, go to step 56). For all other DTCs, go to step 60).
32. 54) Check Ability To Hold Fuel Pressure With fuel pressure gauge installed, cycle ignition from OFF to ON position 3-4 times to pressurize fuel system (DO NOT start engine). Note fuel pressure. If fuel pressure remains within 5 psi (34 kPa) of maximum pressure for at least 10 seconds, go to step 56). If fuel pressure drops more than 5 psi, go to step 58).
33. 55) Check Ability Of Injectors To Deliver Fuel With fuel pressure gauge installed, cycle ignition from OFF to ON position 3-4 times to pressurize fuel system (DO NOT start engine). Note fuel pressure. Disconnect Inertia Fuel Shutoff (IFS) switch. Crank engine for 5 seconds. If fuel pressure remains within 5 psi (34 kPa) of maximum pressure, reconnect IFS switch and go to next step. If fuel pressure drops more than 5 psi (34 kPa), electronic engine control system is not cause of no-start. Reconnect all components. See TESTS W/O CODES - EEC-V article for further diagnosis of no-start.
34. 56) Check Fuel Injector & Circuit Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure and record resistance between suspect fuel injector circuit test pin and test pin No. 71 at breakout box. Refer to FUEL INJECTOR INJ CIRCUIT IDENTIFICATION table. Resistance should be 11-18 ohms. If resistance is not as specified, go to next step. If resistance is as specified, go to step 59). NOTE: If misfire DTCs are present with fuel control DTCs, use misfire DTCs to determine which fuel injector circuits require testing. FUEL INJECTOR INJ CIRCUIT IDENTIFICATION Injector No. Test Pin No. 1 75 2 101 3 74 4 100 5 (1) 73 6 (1) 99 7 (1) 72 8 (1) 98 9 (1) 68 10 (1) 42 (1) If applicable.
35. 57) Check Resistance Of Fuel Injector Circuit Turn ignition off. Disconnect suspect fuel injector connector. Measure resistance between test pin No. 71 at breakout box and VPWR terminal at suspect fuel injector wiring harness connector. Also, measure resistance between fuel injector signal test pin(s) at breakout box and same fuel injector circuit terminal at suspect fuel injector wiring harness connector. If all resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open circuit.
36. 58) Check Fuel Injector Circuit For Short To Power Or Ground Measure resistance between fuel injector test pin(s) and test pins No. 24, 71 and 103 at breakout box. Also, measure resistance between fuel injector test pin(s) at breakout box and chassis ground. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is less than 10,000 ohms, repair short circuit.
37. 59) Check Fuel Injector Drive Signal With ignition off, connect PCM to breakout box. Connect non-powered 12-volt test light between suspect fuel injector test pin and test pin No. 71. Crank or start engine. If test light glows dimly, system is functioning properly. Reconnect all components and go to next step. If test light does not glow dimly (no light/bright light), replace PCM.
38. 60) Check Fuel Injector Flow & Leakage Turn ignition off. Remove breakout box. Reconnect PCM and fuel injector connector(s). Use Rotunda fuel injector tester from Fuel Tester Kit (113-00114) to flow test fuel injectors. Follow injector tester instructions. If fuel injector flow or leakage rate is not okay, replace defective fuel injector(s). If flow rate for each fuel injector is okay, proceed as follows: For DTCs P1131 and P1151, go to next step. For DTCs P0171, P0174, P1130, and P1150, go to step 62). For DTCs P1132 and P1152, go to step 65). For DTCs P1172 and P1175, fault is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).
39. 61) Check Secondary Air Injection If vehicle is not equipped with secondary air injection, go to next step. Turn ignition off. Disconnect secondary air injection hoses from engine and plug air injection ports (engine side). With engine at operating temperature, perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P1131 or P1151 is present, reconnect air injection hoses and go to next step. If DTC P1131 or P1151 is not present, go to «CIRCUIT TEST HM»(ref-131243-S40869920992001123100000), step 7).
40. 62) Check Air Induction System Check air induction system for leaks. Check PCV system for leaks. Check vacuum hoses for damage and tight connections. Check intake manifold gaskets. If any faults are found, repair as necessary. If no faults are found, proceed as follows: For Continuous Memory DTCs P0171, P0174, P1130 or P1150, fault is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000). For DTCs P1131 and P1130, or P1151 and P1150, go to next step.
41. 63) Check Cylinder Compression Using compression gauge, check cylinder compression. If cylinder compression is not okay, repair engine as necessary. If compression is okay, go to next step (DTCs P1130, P1131, P1150 and P1151) or step 65) (DTCs P1132 and P1152). If misfire DTCs are displayed with fuel control DTCs, go to «CIRCUIT TEST HD»(ref-131243-S13555492582001123100000), step 20).
42. 64) Check HO2S Integrity Any vacuum or air leaks can cause DTCs P1130, P1131, P1150, and P1151. Possible causes are: Leaking vacuum actuators. HO2S coated with contaminates. Faulty EGR valve. Faulty PCV system Unmetered air leaks between throttle body and MAF sensor. Engine sealing problems (intake and IAC valve). Turn ignition off. Inspect HO2S wiring harness for chafing, burned wires or other damage. Repair as necessary. Disconnect suspect HO2S connector. Connect DVOM between SIG RTN terminal and HO2S SIG terminal at suspect HO2S. Start engine and operate at 2000 RPM for 3 minutes. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) while monitoring HO2S voltage. If HO2S voltage is more than.5 volt during or at end of test, go to step 70). If voltage is.5 volt or less, replace HO2S sensor.
43. 65) Perform KOER Self-Test Start engine, and warm it to normal operating temperature. Turn ignition off. Disconnect suspect HO2S. Connect a jumper wire between HO2S SIG terminal at suspect HO2S wiring harness connector and negative battery terminal. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P1131 or P1151 is present, remove jumper wire and go to next step. If DTC P1131 or P1151 is not present, check PCM connector and repair as necessary. If connector is okay, replace PCM.
44. 66) HO2S Check Leave HO2S disconnected. Connect DVOM between HO2S SIG terminal and SIG RTN terminal at suspect HO2S wiring harness connector. Disconnect any vacuum hose from vacuum tree. Start engine and operate at 2000 RPM. If DVOM reads less than.4 volt within 30 seconds, go to step 70). If DVOM does not read.4 volt within 30 seconds, replace HO2S. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 66) to step 70). No test procedures have been omitted.
45. 70) Monitor HO2S PID Start engine and allow to idle. Ensure engine is at normal operating temperature. Using scan tool, select HO2S PID from PID/DATA monitor menu. Observe PID value while wiggling and bending wiring harness between HO2S and PCM. If PID voltage stays high (more than.45 volt) or stays low (less than.45 volt), isolate fault and repair as necessary. If PID voltage switches, go to next step.
46. 71) Monitor HO2S PID During Test Drive Using an assistant, test drive vehicle under various conditions while observing HO2S PID. If PID voltage switches from about.4 to.6 volt, system is okay and testing is complete. If voltage does not switch from about.4 to.6 volt, replace HO2S. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 71) to step 80). No test procedures have been omitted.
47. 80) DTC P0136, P0156, P1137, P1138, P1157 & P1158 DTCs P0136 and P0156 indicate that output voltage of downstream HO2S is not within set limits. KOER DTCs P1137, P1138, P1157 and P1158 indicate lack of HO2S switching. Possible causes are: Damaged wiring harness or connector. Exhaust system leaks. Contaminated or defective HO2S. Inspect for faults. Repair as necessary. If no faults are found, go to next step (for DTCs P0136 and P0156) or step 82) (for DTCs P1137, P1138, P1157 and P1158).
48. 81) Perform KOER Self-Test Start engine, and operate at 2000 RPM for 3 minutes. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P1137, P1138, P1157 or P1158 is present, go to next step. If specified DTCs are not present, fault is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).
49. 82) Check Exhaust System Leaks in exhaust system between engine and end of catalytic converter can cause DTCs P0136 and P0156. Possible causes are: Incorrect HO2S torque. Exhaust system leaks. Inspect exhaust system including catalytic converter and HO2S. Repair as necessary. If exhaust system is okay, go to next step.
50. 83) Check HO2S SIG Circuit For Short Circuit Turn ignition off. Ensure suspect HO2S is disconnected. Disconnect scan tool from DLC. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 91 (SIG RTN) and appropriate HO2S SIG test pin and at breakout box as follows: HO2S 12, test pin No. 35. HO2S 22, test pin No. 61. Also, measure resistance between appropriate HO2S SIG test pin and test pins No. 24 (PWR GND), 71 (VPWR), 90 (VREF) and 103 (PWR GND) at breakout box. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short circuit.
51. 84) Check Ground Circuit Resistance Measure resistance between HO2S SIG terminal at suspect HO2S wiring harness connector and appropriate HO2S SIG test pin at breakout box as follows: HO2S 12, test pin No. 35. HO2S 22, test pin No. 61. Also, measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal at suspect HO2S wiring harness connector. If any resistance reading is 5 ohms or more, repair open circuit. If all resistance readings are less than 5 ohms, go to next step.
52. 85) Check HO2S Circuit Turn ignition off. Connect scan tool to DLC. Reconnect suspect HO2S and PCM connectors. Turn ignition on. Using scan tool, select appropriate HO2S PID from PID/DATA monitor menu. DTCs P0136, P1137 and P1138 are for HO2S 12. DTCs P0156, P1157 and P1158 are for HO2S 22. Refer to illustrations for HO2S identification. (Scheme 25)or (Scheme 26). If PID voltage is more than 1.5 volts, go to step 88). If PID voltage is 1.5 volts or less, go to next step.
53. 86) Check Ground Circuit In PCM Turn ignition off. Disconnect PCM wiring harness from breakout box. Measure resistance between test pins No. 103 (PWR GND) and No. 91 (SIG RTN) at breakout box. If resistance is less than 5 ohms, remove breakout box. Reconnect PCM wiring harness to PCM and go to next step. If resistance is 5 ohms or more, replace PCM.
54. 87) Check HO2S PID Connect a jumper wire between VPWR and HO2S SIG terminals at suspect HO2S wiring harness connector. Turn ignition on. Using scan tool, select appropriate HO2S PID from PID/DATA monitor menu. If PID voltage is more than 1.5 volts, replace HO2S. Perform HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE. See FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE under «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If PID voltage is 1.5 volts or less, replace PCM. Perform HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE. See FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE under DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS.
55. 88) Check For HO2S Voltage Turn ignition on. Measure voltage between SIG RTN terminal at suspect HO2S wiring harness connector and negative battery terminal. Also, measure voltage between HO2S SIG terminal at suspect HO2S wiring harness connector and negative battery terminal. If any voltage reading is more than 1.5 volts, replace PCM. If both voltage readings are 1.5 volts or less, replace HO2S. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 88) to step 100). No test procedures have been omitted.
56. 100) KOER DTC P0127 DTC P0127 indicates that HO2S heater was not on during KOER self-test and testing of HO2S did not occur. Possible cause is cool exhaust system. Connect scan tool to DLC. Using scan tool, access all HO2S heater PIDs. If all PIDs indicate ON, repeat «QUICK TEST»(ref-131243-S07493578722001123100000). If any PIDs indicate OFF, operate engine until all PIDs are on. Repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 100) to step 110). No test procedures have been omitted.
57. 110) KOER P1128 & P1129 These DTCs indicate that during KOER self-test, one or both HO2S signals were crossed from bank to bank. DTC P1128 refers to HO2S in front of converter. DTC P1129 refers to HO2S behind converter. Possible causes for these faults are: Crossed HO2S connectors. Crossed HO2S wiring at HO2S connector. Crossed HO2S wiring at PCM connector. Turn ignition off. Disconnect suspect HO2S. Inspect connector for indication of crossed wires or incorrect installation. Repair as necessary. If no faults are found, go to next step.
58. 111) Verify Proper HO2S SIG Pin Location Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Disconnect both suspect HO2S connectors. DTC P1128 is for HO2S 11 and 21. DTC P1129 is for HO2S 12 and 22. Refer to illustrations for HO2S identification. (Scheme 25)or (Scheme 26). Measure resistance between HO2S SIG terminal at suspect HO2S wiring harness connector and appropriate HO2S SIG test pin at breakout box as follows: HO2S 11, test pin No. 60. HO2S 12, test pin No. 87. HO2S 21, test pin No. 35. HO2S 22, test pin No. 61. If resistance is less than 5 ohms, fault is intermittent and cannot be duplicated at this time. If resistance is 5 ohms or more, HO2S wiring is crossed. Recheck all HO2S wiring pin locations at PCM and HO2S connectors. Repair as necessary.

CIRCUIT TEST HC - GASOLINE FUEL DELIVERY SYSTEM

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when directed by QUICK TEST or if directed by other test procedures. This test is used to diagnose

1. Fuel pressure.
2. Fuel filter.
3. Fuel return.
4. Fuel supply.
5. Fuel injector.
6. Engine vacuum systems.
7. Chassis components.

1. 1) Check System Integrity Turn ignition off. Inspect fuel system for leaks, damage or kinked hoses. Inspect fuel system related wiring harness connectors for loose, damaged or corroded terminals. Repair as necessary. Ensure battery is fully charged and fuses are okay. Repair as necessary. If no faults are found, go to next step.
2. 2) Check Voltage At Fuel Pump Connector Connect battery charger to battery. Ensure vehicle has fuel in tank and inertia switch is set correctly. Disconnect fuel pump connector. Turn ignition on. Connect DVOM between fuel pump power circuit terminal and ground terminal at fuel pump wiring harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Using scan tool, access OUTPUT TEST MODE. Command fuel pump on and observe DVOM voltage reading. If voltage is more than 12.5 volts, exit output test mode. Reconnect fuel pump connector and go to next step. If voltage is 12.5 volts or less, go to «CIRCUIT TEST KB»(ref-131243-S34403782012001123100000) step 70).
3. 3) Check For Proper Fuel Filter Maintenance Check last time fuel filter was replaced. If fuel filter has been serviced regularly, go to next step. See FUEL FILTER REPLACEMENT INTERVALS table. If fuel filter has not been serviced regularly, replace fuel filter and go to next step. FUEL FILTER REPLACEMENT INTERVALS Application Interval (Miles) 2 Inch Diameter Filter 50,000 3 Inch Diameter Filter 75,000
4. 4) Check Fuel Pressure Release fuel system pressure. Turn ignition off. Install fuel pressure gauge. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command fuel pump on. Note fuel pressure. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123324) article. If fuel pressure is as specified, go to step 12). If fuel pressure is not as specified, proceed as follows: If fuel pressure is more than 85 psi (586 kPa), no problem is indicated at this time. Check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article.
5. 5) Check System Ability To Hold Fuel Pressure With fuel pressure gauge installed, turn ignition off. Exit OUTPUT TEST MODE. If fuel pressure remains within 5 psi (34 kPa) of specification for 60 seconds, go to step 7). If fuel pressure does not remain within 5 psi (34 kPa) of specification for 60 seconds, go to next step.
6. 6) Check Pressure Regulator Diaphragm With fuel pressure gauge installed, start engine and operate for 10 seconds. Turn ignition off and wait 10 seconds. Start engine again and allow to idle for 10 seconds. Turn ignition off. Disconnect and inspect hose from fuel pressure regulator. If hose is wet with fuel, replace fuel pressure regulator. If hose is dry, go to step 12).
7. 7) Check Fuel Pressure; Test Drive Vehicle With fuel pressure gauge installed, disconnect and plug fuel pressure regulator hose. Ensure fuel pressure gauge can be seen by vehicle operator. Drive vehicle while noting gauge reading during heavy acceleration. If fuel pressure reading stays within 3 psi (21 kPa) of original pressure reading, go to next step. If fuel gauge reading does not stay within 3 psi (21 kPa) of original pressure reading, go to step 13).
8. 8) Check Fuel Pressure Regulator; Test Drive Vehicle With fuel pressure gauge installed, reconnect fuel pressure regulator hose. Install vacuum gauge to intake manifold. Ensure both gauges can be seen by vehicle operator. Drive vehicle while noting gauges during heavy acceleration. Gauge readings should be as follows: Fuel pressure gauge reading increases and vacuum gauge reading decreases. Fuel pressure gauge reading decreases and vacuum gauge reading increases. If gauge readings are as specified, fuel system is functioning properly and testing is complete. If gauge readings are not as specified, go to next step.
9. 9) Check Vacuum Supply Turn ignition off. Disconnect and plug fuel pressure regulator hose. Install vacuum pump to fuel pressure regulator. Start engine and operate at idle. Observe fuel pressure gauge while applying vacuum to regulator. If fuel pressure changes as vacuum changes, repair restricted vacuum source. If fuel pressure does not change as vacuum changes, replace fuel pressure regulator.
10. 10) Check Fuel Pressure Regulator Leave ignition off and scan tool connected to DLC. Release fuel system pressure. Disconnect fuel return hose at fuel rail. Connect a separate hose to fuel rail and put opposite end of hose in clean, one quart container. Turn ignition on. Enter OUTPUT TEST MODE. Command fuel pump on. Note fuel pressure and fuel returning to container. Exit OUTPUT TEST MODE. Command fuel pump off. If fuel pressure is 35-40 psi (240-280 kPa) 35-40 psi with fuel returning to container, go to next step. If fuel pressure is not 35-40 psi (240-280 kPa) or fuel is not returning to container, replace fuel pressure regulator.
11. 11) Check Fuel Return Ensure fuel return line is disconnected at fuel rail. Disconnect fuel return hose at fuel pump. Check return hose for restrictions. Apply 3-5 psi (21-34 kPa) compressed air to return hose. If air flows freely, replace fuel pump. If air does not flow freely, repair or replace fuel return hose.
12. 12) Check Fuel Injector Flow & Leakage Turn ignition off. Use Rotunda fuel injector tester from Fuel Tester Kit (113-00114) to flow test fuel injectors. If flow rate for each fuel injector is within specification, system is okay and testing is complete. Check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article. If flow rate for any fuel injector is not within specification, replace defective fuel injector.
13. 13) Check Fuel Supply System Turn ignition off. Release fuel system pressure. Disconnect fuel supply hose at fuel rail and at the fuel pump. Check supply hose for restrictions. Apply 3-5 psi (21-34 kPa) compressed air to supply hose. If air flows freely, replace fuel pump. If air does not flow freely, repair or replace fuel supply hose.

CIRCUIT TEST HD - MISFIRE DETECTION MONITOR

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Only use this test to diagnose

1. Ignition system.
2. Fuel pressure.
3. Fuel injectors.
4. Engine vacuum system.
5. Evaporative system.
6. Canister purge solenoid.
7. Internal engine wear.

Identifying CKP Sensor & Crankshaft Wheel. Scheme 27

MISFIRE TROUBLE CODES

1. 1) Check Possible Cause Of Misfire If vehicle runs out of fuel, a trouble code may be stored in PCM memory. Ensure vehicle has not recently run out of fuel. Clear PCM memory and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) if necessary. If vehicle has not recently run out of fuel, go to next step.
2. 2) Check Crankshaft Pulley On models equipped with crankshaft pulley-mounted pulse ring, check crank pulley and pulse ring for damage or looseness. On models not equipped with crankshaft pulley-mounted pulse ring, remove front cover if necessary. Check crank pulley and pulse ring for damage or looseness. On all models, repair or replace as necessary. If no faults are found, go to next step.
3. 3) Check For Continuous DTCs Check for other non-misfire Continuous Memory DTCs which could cause the misfire DTC. If any other Continuous Memory DTCs are present, service as necessary. Disregard misfire DTCs at this time. If no other Continuous Memory DTCs are present, go to next step.
4. 4) Check For KOEO DTCs If any KOEO DTCs are present, service as necessary. Disregard misfire DTCs at this time. If any other DTCs are present, perform appropriate «CIRCUIT TEST»(ref-131243-S22790623452001123100000) . If no KOEO DTCs are present, check spark plugs and spark plug wires. If spark plugs and spark plug wires are okay, go to next step.
5. 5) Check For KOER DTCs If any KOER DTCs except P1131, P1137, P1151 or P1157 are present, service as necessary. Disregard misfire DTCs at this time. If KOER DTCs P1131, P1137, P1151 or P1157 are present, go to step 8). If no KOER DTCs are present, go to next step (models equipped with Differential Pressure Feedback (DPF) EGR system) or go to step 8) (models not equipped with DPF EGR system).
6. 6) Check/Compare PID Values Turn ignition and all accessories off. Ensure engine is warmed to normal operating temperature. Turn ignition on. Using scan tester, select and record DPFEGR PID voltage. Start engine and allow to idle. Record DPFEGR PID voltage. If both DPFEGR PID voltage values are within .15 volt of each other, go to step 8). If DPFEGR PID voltages are not within .15 volt of each other, go to «CIRCUIT TEST HE»(ref-131243-S00083294452001123100000) , step 100). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 8). No test procedures have been omitted.
7. 8) Check Fuel Injector & Circuit Resistance Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00959), leaving PCM disconnected. Measure and record resistance between suspected fuel injector test pin and test pin No. 71 and 97 at breakout box. See «MISFIRE TROUBLE CODES»(ref-131243-S41982078462001123100000) table for injector test pin identification. If resistance is 11-18 ohms, go to step 9). If resistance is not 11-18 ohms, go to «CIRCUIT TEST H»(ref-131243-S28517695792001123100000) , step 56).
8. 9) Check Fuel Injector Drive Signal With ignition off, connect PCM to breakout box. Connect a non-powered 12-volt test light between test pin No. 71 or 97 and suspect fuel injector test pin at breakout box. Crank or start engine. If test light glows dimly, system is operating properly. Go to next step. If test light does not glow dimly (no light/bright light), replace PCM.
9. 10) Check Fuel Pressure Turn ignition off. Release fuel pressure. See REMOVE/INSTALL/OVERHAUL article. Install fuel pressure gauge. Start engine and allow to idle. Note fuel pressure gauge reading. Increase engine speed to 2500 RPM and maintain for one minute. Note fuel pressure. If fuel pressure is 20-60 psi (138-413 kPa), go to next step. If fuel pressure is not as specified, check and repair fuel system as necessary.
10. 11) Check System Ability To Hold Fuel Pressure Start engine and allow to idle. Note fuel pressure gauge reading. Increase engine speed to 2500 RPM and maintain for one minute. Check for fuel leaking from around fuel injectors, fuel pressure regulator and fuel hoses. Repair as necessary. Turn ignition off and note fuel pressure gauge reading. If fuel pressure remains within 5 psi (35 kPa) of specification for one minute, go to next step. If fuel pressure does not remain within 5 psi (35 kPa) of specification for one minute, check fuel system and repair as necessary.
11. 12) Check Fuel Injector Flow & Leakage Turn ignition off. Use Rotunda injector tester from Fuel Tester Kit (113-00114) to flow test fuel injectors. Follow injector tester instructions. If flow rate for each fuel injector is okay, go to step 20). If flow rate for any fuel injector is not okay, clean or replace defective fuel injector. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 20). No test procedures have been omitted.
12. 20) Check Vacuum System Inspect all vacuum hoses for kinks or damage. Ensure all vacuum connections are clean and tight. Repair as necessary. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If vacuum system is okay, go to next step. NOTE: The misfire monitor can be affected by the evaporative emission system.
13. 21) Check Evaporative Emission System Inspect carbon canister for fuel saturation. Replace carbon canister if canister contains liquid fuel. If carbon canister is okay, go to next step.
14. 22) Pressure Test Evaporative System Using Rotunda Evaporative Emission System Tester (134-00056), pressure test evaporative system starting at EVAP service port (if equipped) then at fuel filler cap. Follow evaporative emission system tester instructions. If evaporative emission system holds pressure, go to next step. If system does not hold pressure, isolate fault and repair as necessary. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS.
15. 23) Check Vacuum In Evaporative System Inspect vacuum hoses between engine and carbon canister for restrictions or damage. Ensure all vacuum connections are clean and tight. Check fuel tank vent system blockage. Repair as necessary. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If no faults are found, go to step 26).
16. 24) Check EVAP Canister Purge Valve Turn ignition off. Disconnect EVAP Canister Purge Control Valve (CPCV). EVAP CANP is located in right side of engine compartment, next to A/C accumulator. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect a jumper wire between positive battery terminal and VPWR (Red wire) terminal at EVAP CANP wiring harness connector. Connect another jumper wire between ground and EVAP CPCV (Gray/Yellow wire) terminal at EVAP CPCV wiring harness connector. Connect a vacuum pump to manifold side of EVAP CPCV and apply 16 in. Hg. With battery voltage applied, EVAP CPCV should open and pass air freely. If EVAP CPCV functions as specified, go to next step. If EVAP CPCV does not function as specified, replace EVAP CPCV. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS.
17. 25) Check Engine Condition Inspect engine for obvious faults. Ensure compression is okay. Check PCV system for restrictions or leaks. Repair as necessary. If no faults can be found, misfire trouble code is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) , step 50).
18. 26) Check EVAP Canister Purge Control Valve (CPCV) Housing Turn ignition off. Ensure vehicle is at room temperature. Connect vacuum pump to fuel vapor port at EVAP CPCV and apply 16 in. Hg. If vacuum holds, go to next step. If vacuum releases, replace EVAP CPCV.
19. 27) Check For Filter Contamination Disconnect hose from vacuum input port of EVAP CPCV. Connect vacuum pump to EVAP CPCV vacuum input port and apply 10-15 in. Hg. If little or no vacuum is lost, service EVAP CPCV filter. If filter is okay, replace EVAP CPCV. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If vacuum is not as specified, go to step 25). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 27) to step 30). No test procedures have been omitted.
20. 30) Check For Additional Misfire DTCs If any DTCs except P0300 are present, go to step 1). If no other DTCs are present, go to next step.
21. 31) Check For Continuous DTCs If Continuous Memory DTCs are present, service DTCs as necessary. If no other misfire DTCs are present, go to next step.
22. 32) Check/Compare PID Values Turn ignition and all accessories off. Ensure engine is warmed to normal operating temperature. Turn ignition on. Using scan tool, select DPFEGR PID from PID/DATA monitor menu. Record PID voltage. Start engine and allow to idle. Again, record DPFEGR PID voltage. If both PID voltage values are within .15 volt of each other, go to step 40) (models with Hall Effect type camshaft position sensor) or go to step 41) (models with variable reluctance type camshaft position sensor). If DPFEGR PID voltage is not as specified, go to «CIRCUIT TEST HE»(ref-131243-S00083294452001123100000) , step 100). NOTE: Hall Effect type camshaft position sensor has a 3-pin connector. Variable reluctance type camshaft position sensor has a 2-pin connector. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 32) to step 40). No test procedures have been omitted.
23. 40) DTC P1309 This fault indicates misfire detection monitor malfunction. Turn ignition and all accessories off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00959), leaving PCM disconnected. Connect DVOM between test pin No. 85 and test pin No. 51 or 103 at breakout box. Using starter, bump engine in short bursts for at least 10 revolutions. DO NOT allow engine to start. If voltage switches from less than 2 volts to more than 8 volts, check CMP sensor for correct installation. If sensor is correctly installed, replace PCM. If voltage does not switch from less than 2 volts to more than 8 volts, replace CMP sensor. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS.
24. 41) Check CMP Sensor Output Turn ignition and all accessories off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00959). Connect PCM to breakout box. Connect DVOM between test pin No. 85 and test pin No. 51 or 103 at breakout box. Start engine and vary engine speed. If A/C voltage varies more than .1 volt, check CMP sensor for correct installation. If sensor is correctly installed, replace PCM. If voltage does not vary more than .1 volt, replace CMP sensor. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS.

CIRCUIT TEST HE - EGR SYSTEM

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed by QUICK TEST. This test is only intended to diagnose

1. Differential Pressure Feedback (DPF) EGR sensor.
2. DPFE sensor hoses.
3. EGR Vacuum Regulator (VR) solenoid.
4. Orifice tube assembly.
5. Faulty EGR valve.
6. Wiring harness circuits (DPFEGR, EVR, EVR PWR, SIG RTN and VREF).
7. Faulty Powertrain Control Module (PCM).

DPFEGR Sensor Wiring Harness Connector Terminals. Scheme 28

EGR VR Solenoid Wiring Harness Connector Terminals. Scheme 29

Identifying DPFEGR System Components. Scheme 30

Scheme 31

Scheme 32

1. 1) DTC P1400: Check DPFEGR Sensor Voltage This DTC indicates DPFEGR circuit input fault. Possible causes for this fault are: Leaking upstream pressure hose. DPFEGR circuit shorted to GND or SIG RTN circuit. VREF shorted to GND or SIG RTN circuit. Faulty DPFEGR sensor. Faulty PCM. Turn ignition on. Using scan tool, select DPFEGR PID from PID/DATA monitor menu. If PID voltage is less than.2 volt, DPFEGR sensor voltage is less than minimum. Go to next step. If voltage is.2 volt or more, inspect DPFEGR sensor vacuum hoses. Repair as necessary and retest. If vacuum hoses are okay, fault is intermittent. Go to step 6).
2. 2) Generate Opposite DPFEGR Sensor Signal Turn ignition off. Disconnect DPFEGR sensor connector. Connect a jumper wire between DPFEGR and VREF terminals at DPFEGR sensor wiring harness connector. Turn ignition on. Using scan tool, select DPFEGR PID. If scan tool error occurs, disconnect jumper wire and go to next step. If PID voltage is not 4-6 volts, remove jumper wire and go to next step. If PID voltage is 4-6 volts, replace DPFEGR sensor.
3. 3) Measure VREF Voltage At DPFEGR Sensor Measure voltage between SIG RTN terminal and VREF terminal at DPFEGR sensor wiring harness connector. If voltage is 4-6 volts, go to step 4). If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000).
4. 4) Check DPFEGR Circuit For Short To Ground Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 65 and test pins No. 51, 91 and 103. If all resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair short to ground. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 6). No test procedures have been omitted.
5. 6) Wiggle Test Sensor & Harness Turn ignition on. Using scan tool, select DPFEGR PID. Observe DPFE PID voltage for indication of fault while shaking and bending DPFEGR sensor wiring harness and connector. Tap lightly on DPFEGR sensor to simulate road shock. An indication of fault is a sudden change in DPFEGR PID voltage. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.
6. 10) DTC P1401: Check DPFEGR Sensor Voltage This DTC indicates PCM has detected DPFEGR circuit input above maximum. Possible causes for this fault are: Open in DPFEGR circuit or SIG RTN circuit. DPFEGR circuit shorted to VREF or PWR circuit. VREF circuit shorted to PWR circuit. Faulty DPFEGR sensor. Faulty PCM. Turn ignition on. Using scan tool, select DPFEGR PID. If PID voltage is more than 4 volts, go to next step. If PID voltage is 4 volts or less, go to step 19).
7. 11) Check DPFEGR Circuit For Short To Power Turn ignition off. Disconnect DPFEGR sensor connector. Turn ignition on. Measure voltage between DPFEGR terminal at DPFEGR sensor wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, go to step 13).
8. 12) Check For Short To Power Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 65 and test pins No. 51 and 103 at breakout box. If voltage is more than 10.5 volts, repair short to power between DPFEGR and PWR circuits. If voltage is 10.5 volts or less, replace PCM.
9. 13) Generate Opposite DPFEGR Signal Turn ignition off. Connect a jumper wire between DPFEGR and SIG RTN terminals at DPFEGR sensor wiring harness connector. Turn ignition on. Using scan tool, select DPFEGR PID. If scan tool error occurs, disconnect jumper wire and go to step 18). If PID voltage is.05 volt or more, go to step 16). If PID voltage is less than.05 volt, disconnect jumper wire and go to next step.
10. 14) Verify VREF Is Within Range Turn ignition on. Measure voltage between SIG RTN terminal and VREF terminal at DPFEGR sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000).
11. 15) Check DPFEGR Circuit For Short To VREF Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure voltage between test pins No. 65 and 90 at breakout box. If voltage is less than one volt, replace DPFEGR sensor. If voltage is one volt or more, repair short circuit.
12. 16) Check DPFEGR For Open Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Ensure DPFEGR sensor is disconnected. Measure resistance between test pin No. 65 and DPFEGR terminal at DPFEGR sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in DPFEGR circuit.
13. 17) Check SIG RTN For Open Circuit Measure resistance between test pin No. 91 and SIG RTN terminal at DPFEGR sensor wiring harness connector. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in SIG RTN circuit.
14. 18) Check DPFEGR For Short To VREF Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure voltage between test pins No. 65 and 90 at breakout box. If voltage is less than one volt, replace PCM. If voltage is one volt or more, repair short between DPFEGR and VREF circuits.
15. 19) Wiggle Test Sensor & Harness Turn ignition on. Using scan tool, select DPFEGR PID. Observe PID voltage for indication of fault while shaking and bending DPFEGR sensor wiring harness and connector. An indication of fault is a sudden change in DPFEGR PID voltage. Tap lightly on DPFEGR sensor to simulate road shock. If fault is indicated, isolate and repair as necessary. If no fault is indicated, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).
16. 20) DTC P0402: Check EGR Flow At Idle This DTC indicates PCM has detected EGR flow at idle. Possible causes for this fault are: EGR valve stuck open. EGR Vacuum Regulator (VR) solenoid vent plugged. EGRVR circuit shorted to ground. EGRVR circuit shorted to VREF circuit. Pinched, plugged or damaged vacuum hose. Faulty EGR VR solenoid. Faulty PCM. NOTE: If Continuous Memory DTC P1405 is present, go to step 50). Disconnect and plug EGR vacuum hose. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P0402 is present, engine stalls or will not start, check EGR tube, EGR valve and hoses. Repair as necessary and retest. If DTC P0402 is not present, engine starts and does not stall, go to next step.
17. 21) Check EGR Flow Turn ignition off. Reconnect EGR vacuum hose. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P0402 is present, engine stalls or will not start, go to next step. If DTC P0402 is not present, engine starts and does not stall, fault is intermittent. Check for pinched vacuum hoses. Repair as necessary and retest. If vacuum hoses are okay, go to step 30).
18. 22) Check EGR System Using vehicle's vacuum diagram label, check EGR system vacuum hoses for damage, tight connections and correct routing. If hoses are okay, go to next step. If hoses are not okay, repair as necessary.
19. 23) Check DPFEGR Sensor Output Turn ignition off. Disconnect pressure hoses at DPFEGR sensor. Connect vacuum pump to DPFEGR sensor downstream port marked REF. Turn ignition on. Using scan tool, select DPFEGR PID from PID/DATA monitor menu. PID voltage should be.75-1.25 volts with ignition on and no vacuum applied. Using vacuum pump, apply 8-9 in. Hg. PID voltage should be more than 4 volts. When vacuum is quickly released, PID voltage should drop to less than 1.5 volts within 3 seconds. If PID voltage is not as specified, replace DPFEGR sensor. If PID voltage is as specified, go to next step.
20. 24) Check EGR Flow At Idle With EGR VR Solenoid Disconnected Turn ignition off. Disconnect EGR valve vacuum hose. Connect vacuum gauge to hose. Start engine and allow to idle. While observing vacuum gauge, disconnect EGR VR solenoid connector. If vacuum gauge reading is more than 1.6 in. Hg, go to next step. If vacuum gauge reading is 1.6 in. Hg or less, go to step 26).
21. 25) Check EGR VR Solenoid Vent Turn ignition off. Disconnect EGR VR solenoid vacuum hoses. Remove EGR VR solenoid vent cap (if removable). Remove EVR filter and inspect for restriction. Plug EGR VR solenoid vacuum supply port. (Scheme 31) Using a vacuum pump, apply 15 in. Hg to EGR VR solenoid source port. If vacuum holds or is slow to release, EGR VR solenoid is plugged or restricted. Repair or replace EGR VR solenoid as necessary. If vacuum releases (solenoid not plugged or restricted), replace EGR VR solenoid. (Scheme 31): Testing EGR VR Solenoid
22. 26) Check EGR VR Solenoid Coil Resistance Turn ignition off. Disconnect EGR VR solenoid connector. Measure resistance between EGR VR solenoid terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EGR VR solenoid.
23. 27) Check EGRVR Circuit For Short To Ground Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 47 (EVR) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in EGRVR circuit.
24. 28) Check EGRVR Circuit For Short To VREF Measure resistance between test pins No. 47 and 90 at breakout box. If resistance is more than 10,000 ohms, replace PCM. If resistance is 10,000 ohms or less, repair short between EGRVR circuit and VREF circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 28) to step 30). No test procedures have been omitted.
25. 30) Check DPFEGR Sensor Output Turn ignition off. Disconnect pressure hoses at DPFEGR sensor. Connect vacuum pump to DPFEGR sensor port marked REF. Turn ignition on. Using scan tool, select DPFEGR PID and note voltage reading. PID voltage should be.75-1.25 volts with ignition on and no vacuum applied. Using vacuum pump, apply 8-9 in. Hg. PID voltage should be more than 4 volts. When vacuum is quickly released, PID voltage should drop to less than 1.5 volts within 3 seconds. If PID voltage is not as specified, replace DPFEGR sensor. If PID voltage is as specified, go to next step.
26. 31) Check DPFEGR Sensor Voltage Reconnect DPFEGR sensor connector. Turn ignition on. Using scan tool, select DPFEGR PID and note voltage reading. PID voltage should be.75-1.25 volts. Disconnect vacuum hose at EGR valve and plug hose. Connect a vacuum pump to EGR valve. Start engine and allow to idle. Observe DPFEGR PID voltage at idle and compare to PID voltage reading taken with ignition on. Apply only enough vacuum (2-3 in. Hg) to open EGR valve without stalling engine and release vacuum. Repeat several times while observing DPFEGR PID voltage on scan tool. DPFEGR PID voltage should increase as EGR valve begins to open and return to initial voltage value as vacuum is released. A slow return to voltage is an indication of a slow closing EGR valve. If DPFEGR PID voltage does not indicate fault, go to next step. If DPFEGR PID voltage indicates a fault (an open, binding or slow closing EGR valve), service or replace EGR valve.
27. 32) Check EGR Valve Vacuum While Wiggling EGR VR Solenoid Circuit Turn ignition off. Remove vacuum pump from EGR valve vacuum hose and connect a vacuum gauge to hose. Turn ignition on. Observe vacuum gauge for indication of fault while wiggling EGR VR solenoid wiring harness and connector. Fault is indicated by a sudden jump in vacuum reading. Tap lightly on EGR VR solenoid to simulate road shock. If no faults are indicated, go to next step. If fault is indicated, isolate and repair fault as necessary.
28. 33) Check EGR VR Solenoid For Restriction Turn ignition off. Remove EGR VR solenoid vent filter. Inspect for contamination or water. Remove EGR vacuum hose and inspect for restriction. Repair or replace as necessary. If no faults can be found, problem is intermittent and cannot be identified at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 33) to step 50). No test procedures have been omitted.
29. 50) DTC P1405: Check For Upstream Pressure Hose Connection Check upstream hose for clean, tight connection. (Scheme 32) Repair as necessary. Perform EGR MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If hose is okay, go to next step. (Scheme 32): Identifying DPFEGR Sensor Vacuum Circuits
30. 51) Inspect Upstream Pressure Hose Check upstream hose for clean, tight connection. Ensure hose is not plugged, pinched, wet or contaminated. Repair as necessary. Perform EGR MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If hose is okay, go to next step.
31. 52) Inspect Orifice Tube Assembly & DPFEGR Sensor Check DPFEGR sensor port marked HI for restriction or damage. Inspect exhaust manifold side pressure pick-up tube at orifice tube assembly for restriction or damage. Repair as necessary. Perform EGR MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If no faults are found, go to next step.
32. 53) Check DPFEGR Sensor Output Disconnect pressure hoses at DPFEGR sensor. Connect vacuum pump to DPFEGR sensor port marked REF. Turn ignition on. Using scan tool, select DPFEGR PID and note voltage reading. PID voltage should be.75-1.25 volts with ignition on and no vacuum applied. Using vacuum pump, apply 8-9 in. Hg. PID voltage should be more than 4 volts. When vacuum is quickly released, PID voltage should drop to less than 1.5 volts within 3 seconds. If PID voltage is not as specified, replace DPFEGR sensor. If PID voltage is as specified, fault cannot be duplicated at this time. Testing is complete. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 53) to step 60). No test procedures have been omitted.
33. 60) DTC P1406: Check For Downstream Pressure Hose Connection Check downstream hose for clean, tight connection. (Scheme 30) Repair as necessary. If hose is okay, go to next step.
34. 61) Inspect Downstream Pressure Hose Check downstream hose for clean, tight connection. Ensure hose is original equipment. Ensure hose is not pinched, wet or contaminated. Repair as necessary. If hose is okay, go to next step.
35. 62) Inspect Orifice Tube Assembly & DPFEGR Sensor Check DPFEGR sensor ports for restriction or damage. Inspect intake manifold side pressure pick-up tube at orifice tube assembly for restriction or damage. Repair as necessary. If no faults are found, go to next step.
36. 63) Check DPFEGR Sensor Output Disconnect pressure hoses at DPFEGR sensor. Connect vacuum pump to DPFEGR sensor port marked REF. Turn ignition on. Using scan tool, select DPFEGR PID and note voltage reading. PID voltage should be.75-1.25 volts with ignition on and no vacuum applied. Using vacuum pump, apply 8-9 in. Hg. PID voltage should be more than 4 volts. When vacuum is quickly released, PID voltage should drop to less than 1.5 volts within 3 seconds. If PID voltage is not as specified, replace DPFEGR sensor. If PID voltage is as specified, fault cannot be duplicated at this time. Testing is complete. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 63) to step 70). No test procedures have been omitted.
37. 70) DTC P0401 This DTC indicates self-test has detected insufficient EGR flow. Possible causes are: EGR valve stuck closed. EGR valve diaphragm leak. EGR flow plugged or restricted. Faulty EGR hose. EVR VPWR circuit open. EVR VPWR circuit to PCM open or shorted to PWR. DPFEGR sensor VPWR circuit open. Faulty DPFEGR sensor hoses. Faulty DPFEGR sensor. Faulty EGR VR solenoid. Faulty PCM. If fault is currently present, KOER DTC P1408 should be present. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P1408 is present, go to next step. If DTC P1408 is not present, go to step 90).
38. 71) DTC P1408 This DTC indicates KOER self-test has detected EGR flow out of range. Possible causes are: EGR valve stuck closed. EGR valve diaphragm leak. EGR flow plugged or restricted. Faulty EGR hose. EGRVR circuit to PCM open. EGRVR circuit to PCM open or shorted to PWR. DPFEGR sensor VPWR circuit open. DPFEGR sensor hoses faulty or reversed. Downstream pressure hoses plugged or removed. Faulty orifice tube assembly. Faulty DPFEGR sensor. Faulty EGR VR solenoid. Faulty PCM. Retrieve Continuous Memory DTCs. If any DTCs except DTCs P1403 or P1406 are present, service DTCs as necessary before continuing with this test. If DTC P1406 is present, go to step 60). If no DTCs are present, go to next step.
39. 72) Perform KOER SELF-TEST While Monitoring EGR Vacuum Disconnect vacuum hose from EGR valve and connect hose to vacuum gauge. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) while monitoring gauge. Disregard DTCs set during this test. During test, if EGR vacuum increased to 3 in. Hg or more, go to next step. If vacuum stays below 3 in. Hg, vacuum is insufficient to open EGR valve. Go to step 80).
40. 73) Inspect DPFEGR Pressure Hoses Check both DPFEGR sensor hoses for correct routing. (Scheme 32) Ensure hoses are not restricted or plugged or leaking. Inspect DPFE sensor and orifice tube assembly for restriction or damage at pick-up tube. If no faults are found, go to next step. If faults are found, repair as necessary.
41. 74) Check VREF Voltage At DPFEGR Sensor Disconnect pressure hoses at DPFEGR sensor. Connect vacuum pump to DPFEGR sensor port marked REF. Turn ignition on. Using scan tool, select DPFEGR PID and note voltage reading. PID voltage should be.75-1.25 volts with ignition on and no vacuum applied. Using vacuum pump, apply 8-9 in. Hg. PID voltage should be more than 4 volts. When vacuum is quickly released, PID voltage should drop to less than 1.5 volts within 3 seconds. If PID voltage is not as specified, go to next step. If PID voltage is as specified, reconnect hoses and go to step 76).
42. 75) Measure Voltage At DPFEGR Sensor Connector Disconnect DPFEGR sensor connector. Turn ignition on. Measure voltage between VREF terminal and SIG RTN terminal at DPFEGR sensor wiring harness connector. If voltage is 4-6 volts, replace DPFEGR sensor. If voltage is not 4-6 volts, voltage is out of range. Go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000).
43. 76) Check EGR Valve Function Turn ignition off. Disconnect and plug hose at EGR valve. Connect vacuum pump to EGR valve. Start engine and allow to idle. Using scan tool, select DPFEGR and RPM PIDs. Slowly apply 5-10 in. Hg to EGR valve and hold for 10 seconds. It may be necessary to increase engine speed to obtain 1000 RPM. As vacuum increases, PID voltage should rise (up to 2.5 volts). When vacuum is held steady, PID voltage should hold steady. If PID voltage is as specified, reconnect all components and go to step 85). If PID voltage is not as specified, service or replace EGR valve. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 76) to step 80). No test procedures have been omitted.
44. 80) Check EGR VR Solenoid Vacuum Inspect vacuum hoses between EGR VR solenoid and EGR valve for leaks, restrictions, damage or incorrect routing. Repair as necessary. If hoses are okay, disconnect vacuum hoses at EGR VR solenoid. Connect vacuum pump to EGR VR solenoid vacuum supply hose. Start engine and allow to idle. If vacuum gauge reading is 15 in. Hg or more, go to next step. If vacuum gauge reading is less than 15 in. Hg, isolate fault and repair as necessary.
45. 81) Check VPWR To EGR VR Solenoid Turn ignition off. Disconnect EGR VR solenoid connector. Turn ignition on. Measure voltage between ground and VPWR terminal at EGR VR solenoid wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit.
46. 82) Check Resistance At EGR VR Solenoid Turn ignition off. Measure resistance between EGR VR solenoid terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EGR VR solenoid.
47. 83) Check EGRVR Circuit For Short To PWR Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 47 (EGRVR) at breakout box and chassis ground. If voltage is less than one volt, go to next step. If voltage is more than one volt, repair short to power in EGRVR circuit.
48. 84) Check EGRVR Circuit For Open In Harness Turn ignition off. Measure resistance between test pin No. 47 and EGRVR terminal at EGR VR solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in EGRVR circuit.
49. 85) Check EGR VR Solenoid Vacuum Output Capability Reconnect EGR VR solenoid connector. Reconnect PCM to breakout box. Disconnect hose from EGR valve. Connect EGR vacuum hose to vacuum gauge. Start engine and allow to idle. Connect a jumper wire between test pin No. 47 at breakout box and chassis ground. If vacuum gauge reading is 4 in. Hg or more, replace PCM. If vacuum gauge is less than 4 in. Hg, replace EGR VR solenoid. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 85) to step 90). No test procedures have been omitted.
50. 90) Check EGR System Turn ignition off. Check entire EGR system for deterioration or signs of intermittent failure. Repair as necessary. If no faults are found, go to next step.
51. 91) Check EGR Valve Operation Disconnect and plug hose at EGR valve. Connect vacuum pump to EGR valve. Start engine and allow to idle. Using scan tool, select DPFEGR and RPM PIDs. Slowly apply 5-10 in. Hg to EGR valve and hold for 10 seconds. It may be necessary to increase engine speed to avoid stalling. When vacuum increases, PID voltage should increase as EGR valve opens. EGR operation should be smooth with no binding. If EGR valve opens smoothly and holds vacuum, go to next step. If EGR valve is not as specified, service or replace EGR valve as necessary. NOTE: In cold climate, EGR valve may freeze shut and thaw when engine warms, causing intermittent DTC to be set in PCM memory.
52. 92) Check EVR For Short To PWR Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950) to PCM connector. Connect PCM to breakout box. Start engine and allow to idle. Connect a jumper wire between test pin No. 47 at breakout box and chassis ground to turn EGR VR solenoid on. Vacuum gauge reading should be more than 4 in. Hg. Observe vacuum gauge for fault while tapping lightly on EGR VR solenoid. Fault will be indicated by a sudden drop of vacuum. Wiggle EGR VR solenoid vacuum hoses, wiring harness and connector. If fault is indicated, isolate and repair as necessary. If no faults are indicated, symptom cannot be identified at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 92) to step 100). No test procedures have been omitted.
53. 100) Check For EGR Flow Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) and service any other DTCs that are present. If no other DTCs are present, disconnect and plug EGR vacuum supply hose. Turn ignition on. Using scan tool, select DPFEGR PID and note voltage reading. Start engine and allow to idle. Again, note PID voltage reading. Compare PID voltage readings. An increase in PID voltage at idle indicates DPFEGR sensor is sensing EGR flow. If PID voltage increased about.15 volt or more at idle, service or replace EGR valve. If PID voltage did not increase, inspect EGR VR solenoid vent and vent filter. If no faults are found, replace EGR VR solenoid. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 100) to step 110). No test procedures have been omitted.
54. 110) DTC P1409 This DTC indicates self-test has detected electrical malfunction in EGRVR circuit. Possible causes are: EGRVR circuit open or shorted. Faulty EGR VR solenoid. Faulty PCM. Turn ignition off. Disconnect EGR VR solenoid connector. Measure resistance between EGR VR solenoid terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EGR VR solenoid.
55. 111) Check VPWR To EGR VR Solenoid Turn ignition on. Measure voltage between VPWR terminal at EGR VR solenoid wiring harness connector and chassis ground. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit.
56. 112) Check EGRVR Circuit Continuity Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 47 and EGRVR terminal at EGR VR solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in EGRVR circuit.
57. 113) Check EGRVR For Short To PWR Turn ignition on. Measure voltage between test pin No. 47 at breakout box and chassis ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in EGRVR circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 113) to step 120). No test procedures have been omitted.
58. 120) Continuous Memory DTC P1409 This DTC indicates self-test has detected electrical malfunction in EGRVR circuit. Possible causes are: EGRVR circuit open or shorted. Faulty EGR VR solenoid. Faulty PCM. Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 47 and 24 (PWR GND) at breakout box. Voltage should be more than 10.5 volts. Observe DVOM for indication of fault while wiggling EGR VR wiring harness and connector. Fault is indicated by a sudden drop in voltage reading. Tap lightly on EGR VR solenoid to simulate road shock. If fault is indicated, isolate and repair as necessary. If no faults are indicated, unable to duplicate or identify fault at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).

CIRCUIT TEST HF - CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the exhaust system and downstream HO2S.

Internal damage of a catalytic converter is usually caused by abnormal engine operation upstream of catalyst. Conditions that produce higher than normal temperatures in the catalytic converter, such as cylinder misfire, are likely suspects.

MISFIRE DIAGNOSTIC TROUBLE CODES (DTC)

1. 1) DTC P0420 Or P0430: Check Possible Cause Of Misfire DTC P0420 indicates bank one catalyst system efficiency is below minimum requirement. DTC P0430 indicates bank 2 catalyst system efficiency is below minimum requirement. Possible causes are: Use of leaded fuel. Oil contamination. Cylinder misfire. Fuel pressure too high. HO2S sensor improperly connected. Damaged exhaust system component. Faulty ECT sensor. Faulty HO2S. Retrieve all Continuous Memory DTCs. If misfire codes are not present, go to next step. See «MISFIRE DIAGNOSTIC TROUBLE CODES (DTC)»(ref-131243-S12204222642001123100000) table. If any misfire codes are present, isolate cylinder and repair as necessary. NOTE: Non-California applications do not have an HO2S monitor. A Catalyst Efficiency Monitor DTC can be generated for a rear HO2S concern. To check for a rear HO2S concern, go to «CIRCUIT TEST H»(ref-131243-S28517695792001123100000) , step 81). If any repairs are made, perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) . If no repairs were necessary, go to step 3).
2. 2) Check HO2S Monitor DTCs If DTCs P0136, P0138, P0141, P0156, P0158 or P0161 were present in step 1), perform appropriate circuit test. See «DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART»(ref-131243-S33178436662001123100000) . If none of these DTCs are present in step 1), go to next step.
3. 3) Check ECT Sensor DTCs If DTCs P0117, P0118, P0125 or P1117 were present in step 1), perform appropriate circuit test. If none of these codes are present in step 1), go to next step.
4. 4) Check For Other DTCs If any DTCs except P0420 and P0430 are present in step 1), perform appropriate circuit test. If no DTCs except P0420 and/or P0430 are present in step 1), go to next step.
5. 5) Check Rear HO2S Wiring Harness Turn ignition off. Ensure HO2S wiring harness is correctly routed and connectors are tight. Repair as necessary. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Also check PCM pins. If PCM pins are damaged, replace PCM. If wiring harness and connectors are okay, go to next step.
6. 6) Check Fuel Pressure Turn ignition off. Release fuel pressure. See REMOVE/INSTALL/OVERHAUL article. Install fuel pressure gauge. Start engine and allow to idle. Note fuel pressure gauge reading. Increase engine speed to 2500 RPM and maintain for one minute. If fuel pressure is as specified, go to next step. For fuel pressure specifications, see «FUEL PRESSURE SPECIFICATIONS»(ref-123324) article. If fuel pressure is not as specified, go to «CIRCUIT TEST HC»(ref-131243-S35918939922001123100000) .
7. 7) Check For Exhaust System Leaks If exhaust system leaks, it may cause catalyst monitor efficiency test to fail. Inspect exhaust system for cracks, loose connections or punctures. Repair as necessary. If exhaust system is okay, go to next step.
8. 8) Check For Exhaust System Restrictions Inspect exhaust system for collapsed areas, dents or excessive bending. Repair or replace as necessary. If exhaust system is okay, go to next step.
9. 9) Check Manifold Vacuum Install tachometer. Connect vacuum gauge to intake manifold vacuum source. Start engine and raise engine speed to 2000 RPM. Manifold vacuum should rise to more than 16 in. Hg. If manifold vacuum is okay, go to next step. If manifold vacuum is low, go to step 11).
10. 10) Check Manifold Vacuum For Exhaust Restriction Leave tachometer and vacuum gauge connected. Start engine and raise engine speed to 2000 RPM. On a non-restricted system, manifold vacuum increases quickly to normal range as increased RPM is maintained. On a restricted system, manifold vacuum increases slowly to normal range as increased RPM is maintained. If manifold vacuum is okay, no indication of exhaust leak or restriction has been detected and testing is complete. If manifold vacuum is low or slow to respond, go to next step.
11. 11) Check Manifold Vacuum Leave tachometer and vacuum gauge connected. Disconnect exhaust pipe from exhaust manifold. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is downstream from exhaust manifold. Reconnect exhaust pipe to exhaust manifold and go to next step. If manifold vacuum is still low or slow to respond, fault is in exhaust manifold or intake manifold gasket. Repair as necessary.
12. 12) Check Manifold Vacuum Leave tachometer and vacuum gauge connected. Disconnect muffler/tailpipe assembly from rear of catalytic converter. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is in muffler/tailpipe assembly. Repair as necessary. If manifold vacuum is still not okay, fault is in catalytic converter. Repair as necessary. Check tailpipe/muffler assembly for debris from catalytic converter.

CIRCUIT TEST HG - PCV SYSTEM

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Use this test to diagnose Positive Crankcase Ventilation (PCV) valve and related vacuum hoses.

PCV System Schematic. Scheme 33

1. 1) Check PCV Valve Remove PCV valve. Shake valve and listen for rattle. If PCV valve rattles when shaken, install PCM valve and go to next step. Replace PCV valve if it does not rattle when shaken.
2. 2) Check PCV System Start engine and warm to normal operating temperature. Disconnect hose from remote air cleaner or outlet tube. Place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, go to next step. If vacuum from hose holds paper in place for one minute, PCV system is okay and testing is complete.
3. 3) Check Evaporative Emission System Disconnect evaporative emission hose from PCV system and plug connector. Again, place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, isolate vacuum leak or restriction and repair as necessary. If vacuum from hose holds paper in place for one minute, proceed as follows: On models equipped with Fuel Tank Pressure (FTP) sensor, go to «CIRCUIT TEST HX»(ref-131243-S14911163472001123100000) , step 47).

CIRCUIT TEST HK - VARIABLE CAM TIMING (VCT)

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed by QUICK TEST. This test is only intended to diagnose

1. Wiring harness circuits (VCT and VPWR).
2. VCT solenoid.
3. Faulty Powertrain Control Module (PCM).

Identifying Variable Cam Timing (VCT) Solenoid Wiring Harness Connector Terminals. Scheme 34

1. 1) KOEO Or KOER DTC P1380 This DTC indicates a short or open exists in VCT solenoid valve circuit. Possible causes for this fault are: Open or short circuit. Faulty VCT solenoid. Faulty PCM. Start engine. Ensure engine is at normal operating temperature. Perform «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) and KOER ON-DEMAND SELF-TEST. If KOEO or KOER DTC P1380 is present, go to next step. If KOEO or KOER DTC P1380 is not present, fault may be intermittent. Disconnect PCM 104-pin connector and VCT connector. Inspect connectors for loose, damaged or corroded terminals. Repair as necessary and retest. If no faults are found, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) .
2. 2) Check VPWR Voltage Disconnect VCT solenoid connector. Turn ignition on. Measure voltage between chassis ground and VCT terminal at VCT solenoid wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair VPWR circuit.
3. 3) Check For Open VCT Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Measure resistance between test pin No. 44 at breakout box and VCT terminal at VCT solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open VCT circuit.
4. 4) Check VCT Circuit For Short To Ground Measure resistance between test pin No. 44 and test pins No. 71, 91 and 103 at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair open VCT circuit.
5. 5) Check VCT Solenoid Measure resistance between VCT solenoid terminals. If resistance is 3-6 ohms, go to next step. If resistance is not 3-6 ohms, replace VCT solenoid.
6. 6) Check VCT Solenoid For Short To Case Measure resistance between each VCT solenoid terminal and VCT solenoid case. If both resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, replace VCT solenoid. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 11). No test procedures have been omitted.
7. 11) DTC P1381 & P1383 DTC P1381 is set when overadvanced timing is detected. Possible causes are: Camshaft timing improperly set. No oil flow to piston chamber. Low oil pressure. VCT solenoid stuck closed. Camshaft advance mechanism binding (VCT unit). DTC P1383 is set when overretarded timing is detected. Possible causes are: Camshaft timing improperly set. Continuous oil flow to piston chamber. VCT solenoid stuck open. Camshaft advance mechanism binding (VCT unit). Start engine. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) . If KOER DTC P1381 or P1383 is present, go to next step. If KOER DTC P1381 or P1383 is not present, fault may be intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) .
8. 12) Check Camshaft Timing Check camshaft timing. See appropriate article in the ENGINES section. Repair as necessary. If camshaft timing is okay, camshaft advance mechanism is unable to move. Repair or replace VCT unit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 12) to step 15). No test procedures have been omitted.
9. 15) Continuous Memory DTC P1380 This DTC indicates a short or open exists in VCT solenoid valve circuit. Possible causes for this fault are: Open or short circuit. Faulty VCT solenoid. Faulty PCM. Start engine. Ensure engine is at normal operating temperature. Using scan tool, select RCAM PID from PID/DATA monitor menu. Start engine. Increase engine speed to 1500 RPM. While observing PID value, wiggle small sections of wiring harness starting at VCT solenoid working toward PCM. If a momentary open or short circuit is indicated, PID value will change from positive to negative. If engine starts to run rough, VCT circuit may be intermittently shorted to ground causing camshaft to fully retard. If fault is indicated, isolate fault and repair as necessary. If no fault is indicated, unable to duplicate or identify fault at this time. Service any other DTCs that are present. If no other DTCs are present, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) .
10. 16) Continuous Memory DTC P1381 This fault is set when overadvanced timing is detected. Possible causes are: Camshaft timing improperly set. No oil flow to piston chamber. Low oil pressure. VCT solenoid stuck closed. Camshaft advance mechanism binding (VCT unit). NOTE: Testing is performed with cooling fan off. Start engine. Ensure engine is at normal operating temperature. Using scan tool, select CAMERR PID from PID/DATA monitor menu. Start engine. Observe PID value and increase and decrease engine speed from 1500 RPM to idle several times. If PID value does not change from negative to positive, repair or replace VCT unit. If PID value changes from negative to positive, unable to duplicate or identify fault at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) .
11. 17) Continuous Memory DTC P1383 This fault is set when overretarded timing is detected. Possible causes are: Camshaft timing improperly set. Continuous oil flow to piston chamber. Low oil pressure. VCT solenoid stuck open. Camshaft advance mechanism binding (VCT unit). NOTE: Testing is performed with cooling fan off. Start engine. Ensure engine is at normal operating temperature. Using scan tool, select CAMERR PID from PID/DATA monitor menu. Start engine. Observe PID value and increase and decrease engine speed from 1500 RPM to idle several times. If engine runs rough and PID value indicates more than 50 percent error, repair or replace VCT unit. If engine does not run rough and PID value indicates 50 percent error or less, unable to duplicate or identify fault at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) .

CIRCUIT TEST HM - SECONDARY AIR INJECTION (AIR) SYSTEM

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (BATT+, EAIR, EAIR MONITOR and Ground).
2. Solid State Relay (SSR).
3. Electric Air Pump (EAP).
4. Air injection by-pass solenoid.
5. Air injection diverter solenoid.
6. Air injection diverter valve.
7. Air injection by-pass solenoid.
8. Powertrain Control Module (PCM).

Identifying Electric AIR Test Circuit & Connector Terminals. Scheme 35

Mechanical AIR Test Circuit & Connector Terminals. Scheme 36

Identifying Electric AIR Pump Components. Scheme 37

1. 1) DTC P0412: Check BATT+ At SSR This DTC indicates EAIR primary circuit failure. Possible causes are: EAIR circuit open or short to power. AIR by-pass solenoid failure. Faulty Solid State Relay (SSR). Faulty PCM. Turn ignition off. Disconnect SSR. Turn ignition on. Measure voltage between BATT+ terminal at SSR wiring harness connector and negative battery terminal. If voltage is more 10.5 volts, go to next step. If voltage is 10.5 volts or less, go to step 6).
2. 2) Check EAIR Circuit Resistance Turn ignition off. Disconnect AIR by-pass solenoid. Temporarily remove secondary air system dedicated fuse. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 70 (EAIR) at breakout box and EAIR terminal at SSR wiring harness connector. If resistance is 5 ohms or more, repair open circuit. If resistance is less than 5 ohms, go to next step.
3. 3) Check EAIR Circuit Short To Power Measure resistance between test pin No. 70 and test pins No. 51, 71, 90, 97 and 103 at breakout box. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short circuit.
4. 4) Check For Short Circuit Reconnect AIR by-pass solenoid connector. Measure resistance between test pin No. 70 and test pins No. 51, 71, 90, 97 and 103 at breakout box. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, replace AIR by-pass solenoid.
5. 5) Check For Short Circuit Reconnect SSR connector. Measure resistance between test pin No. 70 and test pins No. 51, 71, 90, 97 and 103 at breakout box. If resistance is more than 10,000 ohms, go to step 14). If DTC P0411 or P1411 is present, remove breakout box. Reconnect PCM to PCM wiring harness connector and go step 9). If specified DTCs are not present, go to next step. If resistance is 10,000 ohms or less, replace SSR.
6. 6) Check BATT+ Circuit Resistance Disconnect SSR connector. Measure resistance between terminal "A" at SSR wiring harness connector and AIR system dedicated fuse holder. If resistance is less than 5 ohms, replace dedicated fuse and go to step 8). If resistance is 5 ohms or more, repair open in BATT+ circuit.
7. 7) DTC P0411 Or P1411 Check secondary air hoses for damage, wear or poor connections. Repair as necessary. If all hoses are okay, go to next step.
8. 8) Check Electric Pump Operation Disconnect air hose from AIR diverter valve(s). Start engine and allow to idle. After a 5 second delay, airflow should be present at disconnected air hose for 30-90 seconds. If airflow is present, go to step 15). If airflow is not present, go to step 11).
9. 9) Check For Vacuum At Diverter Valve Turn ignition off. Remove breakout box and reconnect PCM. Disconnect vacuum hose from diverter valve(s). Start engine and allow to idle. After a 5 second delay, vacuum should be present at disconnected vacuum hose(s) for 30-90 seconds. If vacuum is present, go to next step. If vacuum is not present, go to step 30).
10. 10) Check Diverter Valve Turn ignition off. Reconnect vacuum hose at diverter valve(s). Disconnect and plug air tube from diverter valve(s) outlet side. Check diverter valve for damage and repair if necessary. Start engine and allow to idle. After a 5 second delay, vacuum should be present at disconnected air tube(s) for 30-90 seconds. If vacuum is present, repair exhaust tube(s) from diverter valve to exhaust manifold(s). If vacuum is not present, replace hose from electric AIR pump to diverter valve(s).
11. 11) Check EAIR MONITOR Circuit Voltage Turn ignition off. Disconnect electric AIR pump. Turn ignition on. Measure voltage between EAIR MONITOR circuit at electric AIR pump wiring harness connector and chassis ground. If voltage is more than 10.5 volts for 20-30 seconds after a 5-10 second delay, go to step 13). If voltage is not as specified, go to next step.
12. 12) Check Ground Circuit Measure resistance between ground terminal at electric AIR pump wiring harness connector and chassis ground. If resistance is less than 5 ohms, go to step 19). If resistance is 5 ohms or more, repair open in ground circuit.
13. 13) Check Air Pump Hoses Disconnect electric AIR pump air inlet hose. Check hose for water, restriction and binding. Replace hose as necessary. If hose is okay, replace electric AIR pump.
14. 14) Check For Voltage At SSR Turn ignition off. Reconnect AIR by-pass solenoid and SSR. With breakout box installed and PCM connected, turn ignition on. Measure voltage between chassis ground and test pins No. 5 and 70 at breakout box. If any voltage reading is 10.5 volts or less, replace PCM. If both voltage reading are more than 10.5 volts, replace SSR.
15. 15) Check Air Pump For Water Turn ignition off. Disconnect electric pump air hoses and wiring harness connector. Check AIR pump for water. If water is present, replace electric pump. If water is not present, testing is complete (for DTC P0412) or go to step 9) (for DTCs P0411 or P1411). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 15) to step 17). No test procedures have been omitted.
16. 17) DTC P0413: Check BATT+ At SSR This DTC indicates EAIR monitor circuit is low when electric AIR pump is commanded on. Possible causes are: EAIR circuit open or short to power. Faulty Solid State Relay (SSR). Faulty electric AIR pump. Faulty PCM. Turn ignition off. Disconnect SSR. Turn ignition on. Measure voltage between BATT+ terminal at SSR wiring harness connector and negative battery terminal. If voltage is more 10.5 volts, go to step 19). If voltage is 10.5 volts or less, go to step 24). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 17) to step 19). No test procedures have been omitted.
17. 19) Check EAIR MONITOR Circuit Voltage Turn ignition off. Reconnect SSR. Disconnect electric AIR pump wiring harness connector. Turn ignition on. Measure voltage between EAIR MONITOR terminal at electric AIR pump wiring harness connector and chassis ground. If voltage is 10.5 volts or less and DTC P0411 is present, replace AIR pump. If voltage is 10.5 volts or less and DTC P0411 is not present, go to next step. If voltage is more than 10.5 volts, go to step 23).
18. 20) Check EAIR MONITOR Circuit For Short To Power Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, replace PCM.
19. 21) Check EAIR MONITOR Circuit Continuity Turn ignition off. Disconnect SSR and electric AIR pump connector. Measure resistance between test pin No. 5 at breakout box and EAIR MONITOR terminal at SSR wiring harness connector. Also, measure resistance between EAIR MONITOR terminal at SSR wiring harness connector and EAIR MONITOR terminal at AIR pump wiring harness connector. If any resistance reading is 5 ohms or more, repair open in EAIR MONITOR circuit. If both resistance readings are less than 5 ohms, go to next step.
20. 22) Check EAIR MONITOR Circuit For Short To Ground Measure resistance between test pin No. 5 and test pins No. 51, 76 and 91 at breakout box. If all resistance readings are more than 10,000 ohms, replace SSR. If any resistance reading is 10,000 ohms or less, repair short to ground in EAIR MONITOR circuit.
21. 23) Check EAIR MONITOR Circuit Voltage Reconnect air pump. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Start engine and allow to idle. Measure voltage between test pin No. 5 at breakout box and chassis ground. After about 5 seconds, if voltage is more than 10.5 volts, replace PCM. If voltage is 10.5 volts or less, repair open in EAIR MONITOR circuit.
22. 24) Check BATT+ Circuit Continuity Measure resistance between BATT+ terminal at SSR wiring harness connector and terminal "A" at SSR wiring harness connector and AIR system dedicated fuse. If resistance is less than 5 ohms, replace dedicated fuse. If resistance is 5 ohms or more, repair open in BATT+ circuit.
23. 25) DTC P1414: Check EAIR MONITOR Circuit Continuity This DTC indicates electric AIR pump is commanded off, but PCM indicates AIR pump is one. Possible causes are: EAIR circuit open or short to power. Faulty Solid State Relay (SSR). Faulty electric AIR pump. Faulty PCM. Turn ignition off. Disconnect air pump and SSR wiring harness connectors. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 5 at breakout box and EAIR MONITOR terminal at electric AIR pump wiring harness connector. If resistance is 5 ohms or more, repair open in EAIR MONITOR circuit. If resistance is less than 5 ohms, go to next step.
24. 26) Check AIR Pump Resistance Measure resistance between electric AIR pump terminals. If resistance is .5-5.0 ohms, go to next step. If resistance is not .5-5.0 ohms, replace AIR pump.
25. 27) Check EAIR MONITOR Circuit For Short To Power Turn ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, repair short to power.
26. 28) Check For Voltage Reconnect SSR and electric AIR pump connectors. Connect PCM to breakout box. Turn ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. Also, measure voltage between test pin No. 70 at breakout box and chassis ground. If any voltage reading is 10.5 volts or less, replace PCM. If both voltage readings are more than 10.5 volts, replace SSR. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 28) to step 30). No test procedures have been omitted.
27. 30) Check Air Pump Hoses Turn ignition off. Remove air hose between AIR by-pass solenoid and AIR diverter valve. Check hose for restrictions, leaks and cracks. Replace hose as necessary. If hose is okay, go to next step.
28. 31) Check AIR By-Pass Solenoid Disconnect air by-pass solenoid connector. Turn ignition on. Using scan tool, select OUTPUT TEST MODE. Connect voltmeter to AIR by-pass solenoid wiring harness connector. Observe voltmeter while cycling outputs on and off. If voltage cycles more than .5 volt, go to next step. If voltage does not cycle more than .5 volt, go to step 33).
29. 32) Check AIR By-Pass Solenoid Mechanical Operation Remain in OUTPUT TEST MODE. Reconnect AIR by-pass solenoid connector. Disconnect vacuum hose from AIR by-pass solenoid. Connect vacuum hose to vacuum pump. Apply 16 in. Hg to AIR by-pass solenoid. Observe voltmeter while cycling outputs on and off. If vacuum releases as outputs cycle, repair vacuum hose between solenoid and manifold vacuum tree. If vacuum does not release, replace AIR by-pass solenoid.
30. 33) Check Air By-Pass Solenoid Resistance Turn ignition off. Disconnect AIR by-pass solenoid connector. Measure resistance between AIR by-pass solenoid terminals. If resistance is 50-100 ohms, go to next step. If resistance is not 50-100 ohms, replace AIR by-pass solenoid.
31. 34) Check BATT+ Circuit Voltage Turn ignition on. Measure voltage between BATT+ terminal at AIR by-pass solenoid wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in BATT+ circuit.
32. 35) Check EAIR Circuit Continuity Turn ignition off. Disconnect SSR connector. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 70 at breakout box and EAIR terminal at SSR wiring harness connector. Also, measure resistance between test pin No. 70 at breakout box and AIR by-pass solenoid wiring harness connector. If any resistance reading is 5 ohms or more, repair open in EAIR circuit. If both resistance readings are less than 5 ohms, go to next step.
33. 36) Check EAIR Circuit For Short To Ground Turn ignition off. Measure resistance between test pin No. 70 and test pins No. 51, 76 and 91 at breakout box. If all resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short to ground in EAIR circuit.
34. 37) Check EAIR Circuit For Short To Power Measure resistance between test pin No. 70 and test pins No. 71 and 97 at breakout box. If both resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair short to power in EAIR circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 37) to step 40). No test procedures have been omitted.
35. 40) DTC P0411 This DTC indicates secondary air is not being diverted when requested. Possible causes are: Damaged vacuum hoses. Faulty AIR diverter valve. Faulty AIR pump. Faulty AIR diverter solenoids. Check vacuum hoses for restrictions, damage or improper routing. Check AIR pump for broken or loose belt. If belt is broken or loose, go to step 81). If any other faults are found, repair as necessary. If no faults are found, go to next step.
36. 41) Check For Vacuum At Diverter Valve Turn ignition off. Check all AIR vacuum hoses for restrictions, cracks and kinks. Replace vacuum hoses as necessary. If vacuum hoses are okay, go to next step
37. 42) Check For Vacuum At AIR Diverter Valves Disconnect control vacuum hose from AIR diverter valves. Start engine. Ensure engine is at normal operating temperature. Check for vacuum at disconnected control vacuum hose. If vacuum is present, go to next step. If vacuum is not present, go to step 63).
38. 43) Check AIR Diverter Valves Disconnect air hose from AIR diverter valve outlet. Check diverter valve outlet for heat damage. Replace diverter valve(s) as necessary and go to step 60). If AIR diverter valves are okay, go to next step.
39. 44) Check AIR Diverter Valve Diaphragm Connect vacuum pump to AIR diverter valve. Apply 10 in. Hg. Repeat vacuum test for remaining AIR diverter valve. If vacuum holds, go to next step. If vacuum releases, replace AIR diverter valve(s).
40. 45) Check AIR Diverter Valve Flow Start engine and allow to idle. Increase engine speed to 1500 RPM. If airflow is present at AIR diverter valve outlet, go to next step. If airflow is not present, go to step 71).
41. 46) Check AIR Diverter Valve Operation Vent auxiliary vacuum source. Ensure airflow switches from valve outlet to dump port or silencer port. If airflow does not switch, replace AIR diverter valve(s). If airflow switches, go to next step.
42. 47) Visually Inspect AIR By-Pass Valve Turn ignition off. Disconnect vacuum hose from AIR by-pass valve outlet. Check by-pass valve outlet for heat damage. Replace diverter valve(s) as necessary and go to step 60). If AIR diverter valves are okay, go to next step.
43. 48) Check For Vacuum Remove vacuum supply hose from AIR by-pass valve. While checking vacuum, start engine and allow to idle. Vacuum should be present after a 10 second delay. If vacuum is as specified, go to next step. If vacuum is not as specified, go to step 63).
44. 49) Check AIR By-Pass Valve Diaphragm Connect vacuum pump to AIR by-pass valve. Apply 10 in. Hg. If vacuum holds, go to next step. If vacuum releases, replace AIR by-pass valve. Verify symptom is no longer present.
45. 50) Check For Air Supply Start engine and allow to idle. Ensure engine is at normal operating temperature. Check for vacuum at AIR by-pass valve supply hose. If airflow is present, go to next step. If airflow is not present, go to step 71).
46. 51) Check For Air At AIR By-Pass Outlet Connect vacuum pump to AIR by-pass valve. Start engine and allow to idle. Apply 10 in. Hg. to valve. Increase engine speed to 1500 RPM. If airflow is present at AIR by-pass valve outlet, go to next step. If airflow is not present, replace AIR diverter valve. Verify symptom is no longer present.
47. 52) Check For Air At Other AIR By-Pass Outlet Allow engine to idle. Vent auxiliary vacuum source. Air flow should switch from AIR diverter valve outlet to other outlet. If airflow does not switch, replace AIR diverter by-pass valve. If airflow switches, go to step 63). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 60). No test procedures have been omitted.
48. 60) Visually Inspect Check Valve System Turn ignition off. Check all AIR hoses, tubes, control valve and check valves for leaks or external signs of damage. Repair as necessary. If no faults are found, go to next step.
49. 61) Inspect Hoses At Valves Disconnect hose from check valve inlet. Inspect inside of hose for damage from hot exhaust gas. If hose is damaged, replace hose and check valve. If hose is okay, go to next step.
50. 62) Inspect Check Valve Operation Start engine. Ensure engine is at normal operating temperature. Listen or feel for escaping exhaust gas from check valve. If exhaust gas is escaping, replace check valve. Verify symptom is no longer present. If exhaust gas is not escaping, check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article.
51. 63) Check AIR By-Pass & AIR Diverter Solenoid Turn ignition off. Disconnect suspect AIR by-pass solenoid connector. Using scan tool, access OUTPUT TEST MODE. Connect DVOM positive lead to VPWR circuit terminal at suspect solenoid wiring harness connector. Connect negative lead to signal circuit terminal at suspect solenoid wiring harness connector. Observe voltmeter while cycling outputs on and off. If voltage cycles, go to next step. If voltage does not cycle, remove DVOM and go to step 76).
52. 64) Check Vacuum To AIR Diverter Or AIR Bypass Solenoid Remove vacuum hose from suspect solenoid. Start engine and allow to idle. Check for vacuum. If vacuum is present, replace solenoid. If vacuum is not present, go to next step. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 64) to step 66). No test procedures have been omitted.
53. 66) Check Vacuum Supply To Reservoir Turn ignition off. Remove vacuum inlet hose at reservoir marked MAN or VAC. Start engine and allow to idle. If vacuum is present at hose, go to next step. If vacuum is not present, go to step 69) (if vehicle has check valve) or repair vacuum hose (if vehicle does not have check valve). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 66) to step 68). No test procedures have been omitted.
54. 68) Check Reservoir Turn ignition off. Connect vacuum gauge to outlet hose at reservoir (not marked MAN or VAC). Start engine and allow to idle for 30 seconds. If vacuum increases 15-20 in. Hg., replace reservoir outlet hose. If vacuum is not as specified, replace reservoir.
55. 69) Check Air Flow At Check Valve Turn ignition off. Mark check valve for installation reference. Remove check valve. Connect vacuum pump to Black side of check valve. Connect vacuum gauge to opposite end of valve. Apply 16 in. Hg. If vacuum holds, go to next step. If vacuum releases, replace check valve.
56. 70) Inspect Check Valves Ability To Hold Vacuum Remove vacuum pump from check valve. If vacuum holds, no fault is indicated at this time. Check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article. If vacuum releases, replace check valve. Verify symptom is no longer present.
57. 71) Check Belt Tension Ensure belt tension is correct. If belt tension is correct, go to next step. If belt tension is not correct, go to step 81).
58. 72) Check Air Pump Operation Leave ignition off. Disconnect air supply hose from AIR diverter valve. Start engine and allow to idle. Check airflow at pump outlet while varying engine speed. If airflow does not increase as engine speed increases, go to next step. If airflow increases as engine speed increases, no fault is indicated at this time. Check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article.
59. 73) Check Silencer & Filter Remove inlet hose (if equipped). Inspect inlet port for restriction or blockage and repair as necessary. If no faults are found, replace AIR pump. Verify symptom is no longer present. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 73) to step 75). No test procedures have been omitted.
60. 75) DTC P0413, DTC P0414, P0416 Or P0417: Voltage For AIR Solenoid Does Not Change Turn ignition off. Disconnect AIR by-pass/diverter solenoid connector. Turn ignition on. Measure voltage between VPWR terminal at AIR by-pass wiring harness connector and negative battery terminal. Repeat for AIR diverter solenoid (if equipped). If both voltage readings are more than 10.5 volts, go to next step. If any voltage reading is 10.5 volts or less, repair open in VPWR circuit.
61. 76) Check AIR By-Pass & Diverter Solenoid Resistance Turn ignition off. Measure resistance between AIR by-pass solenoid terminals. Also, measure resistance between AIR diverter solenoid terminals. If both resistance readings are 50-100 ohms, go to next step. If any resistance reading is not 50-100 ohms, replace solenoid assembly.
62. 77) Check AIRB & AIRD Circuit Resistance Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 11 at breakout box and AIRD terminal at solenoid connector. Measure resistance between test pin No. 51 at breakout box and AIRB terminal at solenoid connector. If either resistance measurement is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If both resistance measurements are less than 5 ohms, go to next step.
63. 78) Check AIRB & AIRD Circuit For Short To Ground Leave ignition off and solenoids disconnected. Measure resistance between test pin No. 11 (AIRD) and test pins No. 51, 91 and 103 at breakout box. Also, measure resistance between test pin No. 51 (AIRB) and test pins No. 51, 91 and 103 at breakout box. If both resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair circuit short to ground.
64. 79) Check AIRB & AIRD Circuit For Short To Power Measure resistance between test pin No. 11 and test pins No. 71 and 97 at breakout box. Also, measure resistance between test pin No. 51 and test pins No. 71 and 97 at breakout box. If any resistance reading is 10,000 ohms or less, repair short to power. If both resistance readings are more than 10,000 ohms, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 79) to step 81). No test procedures have been omitted.
65. 81) Excessive Belt Noise Check belt tension. If belt is loose, adjust as necessary. Verify symptom is no longer present. If belt tension is okay, go to next step.
66. 82) Check For Loose Pulley Check for loose AIR pump pulley. Check for loose AIR pump mounting brackets. Check for seized AIR pump. Check for broken mounting bolts. Repair as necessary. If no faults are present, testing is complete. Check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article.
67. 83) Check for Excessive Air Noise Start engine and allow to idle. Listen and note engine noises. Turn engine off. Verify AIR pump belt tension is correct before continuing with this test. Go to step 81). Disconnect AIR pump belt. Start engine and allow to idle. If engine noises are still present, return to test that sent you here. If engine noises are no longer present, check AIR pump mounting brackets. Check AIR pump fittings. Repair as necessary. Install AIR pump belt and adjust belt as necessary. Verify symptom is no longer present.

CIRCUIT TEST HU - AIR INTAKE SYSTEM

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Accelerator linkage.
2. Air cleaner assembly.
3. Air inlet tube.
4. Clean air tube and resonator.
5. Throttle body assembly.
6. IMRC actuator assembly.
7. Intake Manifold Runner Control (IMRC) assembly.
8. Wiring harness circuits (IMRC, IMRC MONITOR, SIG RTN, PWR GND and VPWR).
9. Powertrain Control Module (PCM).

Air Intake Circuit & Components Schematic. Scheme 38

Identifying IMRC Wiring Harness Connector Terminals. Scheme 39

Identifying Intake Manifold Tuning (IMT) Valve Vacuum Solenoid Wiring Harness Connector Terminals. Scheme 40

HOT IDLE PID VALUES

1. 1) Confirm Drive Symptom Test drive vehicle. Check for any of the following symptoms: Accelerator pedal sticking or binding. Hard start/long cranking. Hesitation or stalls at idle. Rough idle. Lack of power. If symptom is present, go to next step. If symptom is not present, fault cannot be duplicated or identified at this time. Check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article.
2. 2) Check Accelerator Linkage If linkage sticks, binds or grabs, go to next step. If linkage operation is okay, go to step 6).
3. 3) Inspect Accelerator/Speed Control Cables Turn ignition off. Disconnect accelerator and speed control cables from throttle body. Inspect cables for freedom of travel from accelerator pedal/speed control device to throttle body linkage cable connector. If cables move freely, go to next step. If cables do not move freely, repair as necessary.
4. 4) Check Throttle Return Screw Remove clean air tube from throttle body. Ensure no foreign material or debris is preventing throttle plate from rotating in fully closed position. Check throttle return screw. If throttle return screw is in contact with throttle linkage lever arm when throttle is fully closed, go to next step. If throttle screw is not as specified, replace throttle body.
5. 5) Check Throttle Body Snap throttle from wide open to closed position several times. Slowly cycle throttle from closed to wide open position. Check for freedom of travel especially during initial throttle opening. If throttle does not rotate freely, replace throttle body assembly. If throttle moves freely, fault cannot be duplicated or identified at this time. Check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article.
6. 6) Check Air Filter Check air filter. Clean or replace as necessary. If air filter is okay, go to step 8). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 8). No test procedures have been omitted.
7. 8) Check Related Engine Systems If sent here from CIRCUIT TEST QA, go to next step. If not sent here from CIRCUIT TEST QA, ensure following engine systems are in good operating condition: Positive Crankcase Ventilation (PCV) system. Ignition system. Exhaust system. Engine cooling system. Ensure engine coolant temperature is more than 180°F (82°C). Fuel pressure. Fuel quality. If systems are operating correctly, go to next step. If systems are not operating correctly, go to CIRCUIT TEST as indicated: Exhaust system: repair as necessary. Fuel pressure: «CIRCUIT TEST HC»(ref-131243-S35918939922001123100000). PCV system: «CIRCUIT TEST HG»(ref-131243-S09618704472001123100000). Engine cooling system: repair as necessary.
8. 9) Check For Vacuum Leaks Start engine and allow to idle. Inspect inlet air system from MAF sensor to intake manifold for cracks, loose connections or faulty gaskets. Inspect intake manifold, EGR diaphragm and vacuum hoses for leaks. Repair as necessary. If no faults are found, go to next step.
9. 10) Check Idle Speed Turn all accessories off. Start engine and warm to normal operating temperature. Using scan tool, select RPM PID and IAC PID, idle air percent duty cycle. See «HOT IDLE PID VALUES»(ref-131243-S03699697622001123100000) table. If RPM and IAC PIDs are as specified, go to next step. If RPM AND IAC PIDS are not as specified, go to step 12).
10. 11) Check Idle Control Response Ensure engine is at normal operating temperature. Ensure electric cooling fan (if equipped) is off, but connector is not disconnected. With engine operating at idle, snap throttle wide open and return to idle position. If engine stalls or engine speed fluctuates excessively before returning to idle, go to next step. If engine does not stall or engine speed does not fluctuate, air intake system is okay and testing is complete. Check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article.
11. 12) Check IAC Solenoid Function Leave accessories off. With engine operating at idle, disconnect IAC solenoid connector. If engine speed does not change, replace IAC solenoid and clear Keep Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes. If engine speed changes, proceed as follows: For vehicles without fast idle symptom, go to next step. For vehicles with fast idle symptom, go to step 14).
12. 13) Check Throttle Body Turn ignition off. Remove throttle body. With throttle fully closed, ensure light cannot be seen between throttle bore and plate. Snap throttle from wide open to closed position several times. Slowly cycle throttle from closed to wide open position. Check for freedom of travel especially during initial throttle opening. If faults are present, replace throttle body and clear Keep Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes. If throttle body is okay, fault cannot be duplicated or identified at this time. Reinstall throttle body and check for additional symptoms and repair as necessary. See TESTS W/O CODES - EEC-V article.
13. 14) Check IAC Circuit For Short To Ground Leave accessories off and IAC solenoid disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 83 (IAC) and test pin No. 51 or 103 (PWR GND) at the breakout box. If resistance is more than 10,000 ohms, replace PCM. If resistance is 10,000 ohms or less, repair short to ground.
14. 15) DTC P1516, P1517, P1518 & P1519 DTCs P1516 and P1517 indicate control circuit failure. DTCs P1518 indicates IMRC stuck open. DTC P1519 indicates IMRC stuck closed. Possible causes are: Faulty vacuum hoses. Faulty vacuum solenoid. Faulty vacuum actuator. Cables improperly routed, binding or seized. Damaged or disconnected IMRC housing return springs. Lever return stop obstructed or bent. Lever wide open stop obstructed or bent. IMRC actuator cable or gears seized. On models with electric IMRC system, visually inspect IMRC cables for correct routing. Ensure cable core wire has slack at IMRC housing and stop screw contacts lever. On models with vacuum operated IMRC system, ensure sensor linkage is attached and secure. With engine running, lever must contact closed plate stop screw. On all models, operate IMRC plates while checking for binding and sticking. If any faults are found, repair as necessary. If no faults are found, go to next step.
15. 16) Check IMRC Function If IMRC is vacuum controlled, start engine and allow to idle for 20 seconds. Turn ignition off. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Turn all outputs on. When IMRC is commanded on, lever(s) should rotate to full open position. One or both levers should contact wide open stop (one lever being slightly off is acceptable). IRMC levers should cycle fully from closed to open position. If faults are present, go to next step. If no faults are present proceed as follows: With DTC P1516 and/or P1517, go to step 64). With DTC P1518, go to step 26). With DTC P1519, go to step 29).
16. 17) Check IMRC Operation Start engine and allow to idle. Apply parking brake. Raise engine speed to more than 3500 RPM. When engine speed exceeds 3500 RPM, one or both levers should contact wide open stop (one lever being slightly off is acceptable). When engine speed drops to less than 3000 RPM, one or both levers should contact closed plate stop screw. If levers do not cycle, go to next step. If levers cycle as specified, proceed as follows: With DTC P1516 and/or P1517, go to step 64). With DTC P1518, go to step 26). With DTC P1519, go to step 29).
17. 18) Perform IMRC Mechanical Test Turn ignition off. Disconnect cables from both left and right intake runners. Operate both levers while checking for binding or sticking. Feel for return spring tension. If any faults are found, repair as necessary. If no faults are found, proceed as follows: With DTC P1516 and/or P1517, go to step 64). With DTC P1518, go to step 26). With DTC P1519, go to step 29).
18. 19) Verify IMRC Circuit Fault Possible causes are: IMRC control circuit open or shorted to PWR GND or SIG RTN. VREF circuit open or shorted to IMRC control circuit. Faulty IMRC actuator. Faulty Powertrain Control Module (PCM). Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select IMRCF PID. If PID value indicates YES, go to next step. If PID value indicates NO, fault is intermittent. Go to step 36).
19. 20) Check IMRC Voltage Turn ignition off. Disconnect IMRC actuator connector. Turn ignition on. Measure voltage between VPWR terminal at IMRC actuator wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit.
20. 21) Check For Open Circuit Measure voltage between SIG RTN terminal and VPWR terminal at IMRC actuator wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in SIG RTN circuit.
21. 22) Check IMRC Circuit Driver For Short To Ground Turn ignition off. Disconnect scan tool from DLC. Measure resistance between IMRC SIGNAL terminal at IMRC actuator wiring harness connector and negative battery terminal. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, go to step 39).
22. 23) Check IMRC Circuit Driver For Short To Ground Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure voltage between test pin No. 42 and test pin No. 51 or 103 (PWR GND) at breakout box. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short circuit.
23. 24) Check IMRC Circuit Driver For Open Circuit Measure resistance between test pin No. 42 at breakout box and IMRC SIGNAL terminal at IMRC actuator wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in IMRC SIGNAL circuit.
24. 25) Verify PCM IMRC Driver Reconnect IMRC actuator connector. Turn ignition on. Connect jumper wire between test pin No. 42 and test pin No. 51 or 103 at breakout box. If IMRC plates open, replace PCM. If IMRC plates do not open, replace IMRC actuator.
25. 26) DTC P1518: Check IMRC MONITOR Circuit DTC P1518 indicates low circuit voltage. Possible causes are: IMRC control circuit shorted. Faulty IMRC actuator. Faulty Powertrain Control Module (PCM). Connect scan tool to DLC. Ensure IMRC plates are closed. If IMRC plates are open, go to step 20). Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select IMRCM PID from PID/DATA monitor menu. If PID voltage is more than 1.6 volts, go to step 34). If PID voltage is 1.6 volts or less, go to next step.
26. 27) Check IMRC Monitor Circuit Turn ignition off. Disconnect IMRC actuator connector. Turn ignition on. Using scan tool, select IMRCM PID. If PID voltage changed to more than 1.6 volts when IMRC actuator was disconnected, replace IMRC actuator. If PID voltage stayed at less than 1.6 volts, go to next step.
27. 28) Check For Short To Ground Turn ignition off. Disconnect PCM 104-pin connector. Disconnect scan tool from DLC. Measure resistance between IMRCM terminal at IMRC actuator wiring harness connector and negative battery terminal. Also, measure resistance between IMRCM terminal and SIG RTN terminal at IMRC actuator wiring harness connector. If both resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair short to ground in IMRCM circuit.
28. 29) DTC P1519 DTC P1519 indicates IMRC input is greater than expected. Possible causes are: IMRC circuit open. IMRC circuit shorted to ground or VREF. SIG RTN circuit open. Faulty IMRC actuator. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect IMRC actuator connector. Turn ignition on. Connect jumper wire between IMRCM terminal and SIG RTN terminal at IMRC actuator wiring harness connector. Using scan tool, select IMRCM PID from PID/DATA monitor menu. NOTE: If scan tool communication error exists, remove jumper wire and go to step 38). If PID voltage is less than.2 volt, remove jumper wire and go to step 40). If PID voltage is.2 volt or more, remove jumper wire and go to next step.
29. 30) Check For Open In SIG RTN Circuit Turn ignition off. Disconnect scan tool from DLC. Measure resistance between SIG RTN terminal at IMRC actuator wiring harness connector and negative battery terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in SIG RTN circuit and go to step 33).
30. 31) Check IMRCM Circuit Continuity Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 8 (IMRCM) and IMRCM terminal at IMRC actuator wiring harness connector. If resistance is less than 5 ohms, replace PCM and go to step 33). If resistance is 5 ohms or more, repair open in IMRCM circuit and go to step 33).
31. 32) Check Circuit Operation Turn ignition off. Reconnect all components. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Access IMRCM and IMRC PIDs. Connect DVOM between test pin No. 8 and test pin No. 51 or 103. Command outputs ON. IMRCM PID reading should be less than 1.6 volts (DVOM reading should be same) and IMRC PID value should indicate ON. If PID values are as specified, fault is intermittent, go to step 34). If PID values are not as specified, replace IMRC actuator and go to next step.
32. 33) IMRC Verification Drive Cycle Clear PCM memory. Using scan tool, select IMRC PID, IMRCM PID and RPM PID. Test drive vehicle with transmission in Overdrive. Complete 3 accelerations from a complete stop to a speed requiring engine speed of more than 3500 RPM. Watch for PID values to change. Stop vehicle. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000) and retrieve all DTCs. If any DTCs are present, go to appropriate «CIRCUIT TEST»(ref-131243-S22790623452001123100000). If no DTCs are present, testing is complete.
33. 34) Wiggle Test Turn ignition off. Disconnect IMRC actuator connector. Connect jumper wire between terminals IMRCM and SIG RTN at IMRC actuator wiring harness connector. Turn ignition on. Using scan tool, select IMRCM PID. Observe PID for signs of fault. A fault will be indicated by change in PID voltage from less than.2 volt to more than 1.6 volts. Wiggle wiring harness between IMRC actuator connector and PCM connector. If fault is indicated, isolate fault and repair as necessary. If no faults are indicated, remove jumper wire and go to next step.
34. 35) Wiggle Test Leave IMRC actuator disconnected. Turn ignition on. Using scan tool, select IMRCM PID. Observe PID for signs of fault. A fault will be indicated by change in PID voltage to less than 1.6 volt. Wiggle wiring harness between IMRC actuator connector and PCM connector. If fault is indicated, isolate fault and repair as necessary. If no faults are indicated, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).
35. 36) Intermittent Circuit Malfunction Turn ignition off. Reconnect all components. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select OUTPUT TEST MODE. Select IMRCM and IMRC PIDs. If scan tool will not allow access to PIDs while in Output Test Mode, install Breakout Box (014-00950). Connect PCM to breakout box. Connect a DVOM between test pin No. 42 and test pin No. 51 or 103 at breakout box. Command outputs ON. IMRC PID should indicate ON and (DVOM should indicate less than one volt) and IMRCM PID should indicate less than 1.6 volts. Observe PID values for signs of fault. A fault will be indicated by sudden change in IMRCM PID voltage or in DVOM voltage reading. Wiggle wiring harness between IMRC actuator connector and PCM connector. If fault is indicated, isolate fault and repair as necessary. If no faults are indicated, go to next step.
36. 37) Check For Intermittent Short To Ground Turn ignition on. While observing IMRC plates, wiggle wiring harness between IMRC actuator connector and PCM connector. If IMRC plates move while wiggling harness, a possible short to ground in IMRC control circuit is indicated. Isolate fault and repair if necessary. If no faults are indicated, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).
37. 38) Check For Short To VREF Circuit Turn ignition. Disconnect IMRC actuator connector. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 8 and 90 at breakout box. If resistance is more than 10,000 ohms, replace PCM. If resistance is 10,000 ohms or less, repair short between IMRCM and VREF circuit.
38. 39) Check For Short To Ground Turn ignition off. Disconnect IMRC actuator connector. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 42 and test pin No. 91 (SIG RTN) and 103 (PWR GND) at break. If both resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair short to PWR GND or SIG RTN in IMRC control circuit.
39. 40) Check IMRC Circuit Turn ignition off. Reconnect all components. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Observe IMRC lever(s). If lever(s) cycle open during output command, go to step 32). If levers do not cycle open during output command, go to step 20). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 40) to step 64). No test procedures have been omitted.
40. 64) Determine IMRC Fault Path DTC P1516 or P1517 indicate IMRC plates open or closed time exceeded PCM program. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select IMRCM PID. Also select IMRC2M PID. If PID voltage is less than 3 volts, go to step 29). If PID voltage is 3 volts or more, go to step 26).
41. 65) DTC P1549: Check IMT Valve & Vacuum Actuator Connection This fault indicates IMTV circuit fault. Possible causes are: VPWR circuit open. Open or shorted signal circuit. Faulty IMT valve. Faulty Powertrain Control Module (PCM). Turn ignition off. Check IMT valve system. Ensure wiring harness connector is installed properly. Repair as necessary. If no faults are found, go to next step.
42. 66) Check PCM Driver Command Start engine. Using scan tool, select IMTV PID from PID/DATA monitor menu. Observe PID value and increase engine speed to about 3500 RPM. PID value should indicate 100 percent then drop to 50 percent when engine RPM is more than 3500. If PID value is as specified, PCM driver command is okay. Go to next step. If PID value is not as specified, replace PCM.
43. 67) Check IMT Valve Actuator Or Vacuum Solenoid VPWR Circuit For Open Turn ignition off. Disconnect IMT valve actuator connector or IMT vacuum solenoid connector. (Scheme 40) Measure resistance between chassis ground and VPWR terminal at IMT valve actuator/vacuum solenoid wiring harness connector. If voltage is more than 10.5 volts, go to step 69). If voltage is 10.5 volts or less, repair open in VREF circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 67) to step 69). No test procedures have been omitted.
44. 69) Check For Open Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 46 at breakout box and IMT VALVE SIGNAL terminal at IMT valve actuator/vacuum solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in IMT VALVE SIGNAL circuit.
45. 70) Check IMT Valve Actuator Or Vacuum Solenoid Signal Circuit For Short To PWR GND Measure resistance between test pin No. 46 and test pin No. 77 or 103 at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair IMT VALVE SIGNAL circuit short to PWR GND circuit.
46. 71) Check IMT VALVE SIGNAL Circuit For Short To VPWR Turn ignition on. Measure voltage between test pin No. 46 and test pin No. 77 or 103 at breakout box. If voltage is one volt or more, repair IMT VALVE SIGNAL circuit short to VPWR. If voltage is less than one volt, go to next step.
47. 72) Check PCM Driver Turn ignition off. Connect PCM to breakout box. Connect a DVOM between ground and VPWR terminal at IMT valve actuator/vacuum solenoid wiring harness connector. Turn ignition on. Voltage should be less than one volt. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. DVOM voltage reading should be more than 10.5 volts. If voltage is not as specified, replace PCM. If voltage is as specified, go to next step.
48. 73) Check IMT Valve Shutter Remove IMT valve. Check IMT valve shutter for damage. Rotate shutter and check for binding. Replace IMT valve as necessary. If IMT valve is okay, leave IMT valve disassembled. Go to next step.
49. 74) Check IMT Valve Actuator Reconnect IMT valve actuator connector. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Observe IMT valve shutter and command all outputs ON. If shutter rotates, no fault is indicated at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000). If shutter does not rotate, replace IMT valve actuator. Verify symptom is no longer present.
50. 75) Check Manifold Vacuum Reconnect IMT valve solenoid connector. Inspect IMT valve solenoid vacuum hoses for kinks, blockage, damage and proper routing. Repair as necessary. Disconnect vacuum supply hose (from intake manifold) at IMT valve solenoid. Install a vacuum gauge to disconnected vacuum supply hose. Start engine and allow to idle. If vacuum is more than 10 in. Hg, reconnect vacuum hose and go to next step. If vacuum is 10 in. Hg or less, repair vacuum source.
51. 76) Check Vacuum between Vacuum Solenoid & IMT Valve Disconnect vacuum supply hose (from solenoid) at IMT valve. Install a vacuum gauge to disconnected vacuum supply hose. Start engine and allow to idle. Note vacuum gauge reading. Increase engine speed to about 3500 RPM. Note vacuum gauge reading. If vacuum is zero in. Hg at idle and more than 10 in. Hg with engine speed at about 3500 RPM, go to step 73). If vacuum is not as specified, replace vacuum solenoid. Verify symptom is no longer present.
52. 77) Check IMT Valve Using a vacuum pump, apply about 10 in. Hg to IMT valve and observe IMT valve shutter. If shutter rotates 90 degrees with vacuum applied and returns to original position with vacuum released, fault is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000). If shutter does not operate as specified, replace IMT valve. Verify symptom is no longer present. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 77) to step 80). No test procedures have been omitted.
53. 80) Check For Open Circuit Turn ignition off. Disconnect vacuum solenoid connector. Turn ignition on. Measure voltage between chassis ground and VPWR terminal at vacuum solenoid wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit.
54. 81) Check Voltage To Vacuum Actuators Disconnect vacuum actuator connectors. Measure voltage between chassis ground and VPWR terminal at each vacuum actuator wiring harness connector. If both voltage readings are more than 10.5 volts, go to next step. If any voltage reading is 10.5 volts or less, repair open in VPWR circuit.
55. 82) Check PCM Driver Connect a DVOM between ground and VPWR terminal at vacuum solenoid wiring harness connector. Voltage should be less than one volt. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. DVOM voltage reading should be more that 10.5 volts. If voltage is not as specified, go to next step. If voltage is as specified, go to step 86).
56. 83) Check For Short To PWR GND Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 42 and test pin No. 77 or 103 (PWR GND) at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in IMRC SIGNAL circuit.
57. 84) Check For Short To VPWR Turn ignition on. Measure voltage between test pin No. 42 and test pin No. 77 or 103 at breakout box. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to VPWR in IMRC SIGNAL circuit.
58. 85) Check For Open In IMRC SIGNAL Circuit Turn ignition off. Measure resistance between test pin No. 42 and IMRC SIGNAL terminal at vacuum solenoid wiring harness connector. If resistance is less than 5 ohms, no fault is indicated at this time. Reconnect all components and go to step 33). If resistance is 5 ohms or more, repair open in IMRC SIGNAL circuit. Go to step 33).
59. 86) Check Vacuum To Vacuum Solenoid Inspect vacuum solenoid hoses for kinks, blockage, damage and proper routing. Repair as necessary. Disconnect vacuum supply hose (from intake manifold) at vacuum solenoid. Install a vacuum gauge to disconnected vacuum supply hose. Start engine and allow to idle. If vacuum is more than 10 in. Hg, reconnect vacuum hose and go to next step. If vacuum is 10 in. Hg or less, repair vacuum source. Go to step 33).
60. 87) Check Vacuum To Vacuum Actuators Disconnect vacuum hose at vacuum solenoid (hose going to actuators). Install a vacuum gauge to vacuum solenoid. Start engine and allow to idle. Note vacuum gauge reading. Increase engine speed to about 3500 RPM. Note vacuum gauge reading. If vacuum is more than 10 in. Hg at idle and zero in. Hg with engine speed at about 3500 RPM, turn ignition off and go to next step. If vacuum is not as specified, replace vacuum solenoid. Verify symptom is no longer present.
61. 88) Check For Open PWR GND Circuit Turn ignition on. Measure voltage between PWR GND terminal and VPWR terminal at each vacuum actuator wiring harness connector. If both voltage readings are more than 10.5 volts, go to next step. If any voltage reading is 10.5 volts or less, repair open PWR GND circuit. Go to step 33).
62. 89) Check For Short To VPWR Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between IMRC SIGNAL terminal and PWR GND terminal at each vacuum actuator wiring harness connector. If both voltage reading is less than one volt, go to next step. If any voltage reading is one volt or more, repair short to VPWR in IMRC SIGNAL circuit. Go to step 33).
63. 90) Check For Short To PWR GND Turn ignition off. Measure resistance between test pin No. 8 and test pin No. 77 or 103 at breakout box. Also, measure resistance between test pin No. 9 and test pin No. 77 or 103 at breakout box. If both resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, replace short to PWR GND. Go to step 33).
64. 91) Check For Open Circuit Measure resistance between test pin No. 8 at breakout box and IMRCM terminal at vacuum actuator (for right cylinder head) wiring harness connector. Also, measure resistance between test pin No. 9 at breakout box and IMRCM terminal at vacuum actuator (for left cylinder head) wiring harness connector. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading in 5 ohms or more, repair open circuit and go to step 33).
65. 92) Check PCM Monitor Circuits Connect PCM to breakout box. Turn ignition on. Using scan tool, select IMRCM and IMRC2M PIDs from PID/DATA monitor menu. Connect a jumper wire between test pins No. 8 and 103 at breakout box. IMRCM PID. voltage should be zero volts. Disconnect jumper wire at terminal No. 103 and connect jumper wire to terminal No. 97. IMRCM voltage should now be 2.5 volts. Connect a jumper wire between test pins No. 9 and 103 at breakout box. IMRC2M PID voltage reading should be zero volts. Disconnect jumper wire at terminal No. 103 and connect jumper wire to terminal No. 97. IMRC2M PID voltage should now be 2.5 volts (5 volts if checking at breakout box with a DVOM). If PID voltage readings are as specified, remove jumper wires and go to next step. If any PID voltage reading is not as specified, replace PCM. Go to step 33).
66. 93) Check Signal Voltage Reconnect vacuum actuator connectors and vacuum solenoid connector. Start engine and allow to idle. Note IMRCM and IMRC2M PID voltage readings. Increase engine speed to more than 3500 RPM. Again, note IMRCM and IMRC2M PID voltage readings. PID voltage readings should be more than 3 volts at idle and less than.5 volt with engine speed at more than 3500 RPM (voltage will be more than 6 volts at idle and less than on volt at 3500 RPM if checking at breakout box with a DVOM). If PID voltage readings are as specified, no fault is indicated at this time. Fault may be intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000). If any PID voltage reading is not as specified, replace vacuum actuator that failed. Go to step 33). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 93) to step 95). No test procedures have been omitted.
67. 95) Perform IMRC Wiggle Test Turn ignition off. Connect scan tool to DLC. Turn ignition on. Using scan tool, select IMRCM PID. Observe PID value while wiggling wiring harness between IMRC actuator connector and PCM. If PID value fluctuates, isolate fault and repair as necessary. If PID value does not fluctuate, replace PCM and go to step 33).

CIRCUIT TEST HX - EVAPORATIVE EMISSION (EVAP) MONITOR & SYSTEM

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs. If any EVAP components were replaced, perform VEHICLE PREPARATION FOR OBD-II OR MONITOR REPAIR VERIFICATION DRIVE CYCLE and EVAP RUNNING LOSS SYSTEM REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS. After drive cycle is completed, repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Leaks in fuel tank, filler cap or vapor hoses.
2. Faulty Canister Vent (CV) solenoid.
3. Faulty Fuel Tank Pressure (FTP) Sensor.
4. Faulty carbon canister.
5. Wiring harness circuits (CV, FLI, FTP, EVAP CANISTER PURGE, SIG RTN, PWR GND, VPWR and VREF).
6. Faulty PCM.

Identifying EVAP System Components. Scheme 41

EVAP Canister Purge Valve Circuits & Connector Terminals. Scheme 42

Identifying CV Solenoid Circuits & Connector Terminals. Scheme 43

Identifying FTP Circuits & Connector Terminals. Scheme 44

1. 1) Continuous Memory DTC P0442 This DTC indicates a fuel vapor leak has been detected. Check the following for possible cause for this fault: Faulty aftermarket EVAP system components. Faulty fuel filler cap. Faulty fuel vapor hoses or tubes. Faulty EVAP system components. CV solenoid partially open when commanded closed. Faulty EVAP canister. If no faults are found, go to next step. If any faults are found, repair as necessary. After repair is completed, go to next step. NOTE: When checking EVAP system for leaks or blockage, energize (close) Canister Vent (CV) solenoid for a maximum of 9 minutes per test step. Then de-energize CV solenoid prior to performing the next test step. This is done to ensure proper closing of CV solenoid.
2. 2) Check For EVAP System Leaks At Evaporative Emission Test Port Disconnect and plug EVAP return tube (EVAP Canister Purge (CANP) valve-to-intake manifold) at intake manifold vacuum source. Turn ignition on. Using scan tool, select VPWR PID from PID/DATA monitor menu. If PID voltage is less than 12 volts, go to step 61). If PID voltage is 12 volts or more, locate evaporative test port (marked EVAPORATIVE SERVICE PORT) between EVAP CANP valve and EVAP canister. If vehicle does not have a test port, go to next step. Install EVAP System Leak Tester (134-00056) including compressed gas source (nitrogen or argon) and pressure regulator to test port. Using scan tool, energize CV solenoid by entering OUTPUT TEST MODE, and commanding all outputs ON. Select ALL OFF mode and press START button on scan tool. Regulate gas pressure on tester to 14 in. H2O. Using instructions provided with EVAP system leak tester, pressurize EVAP system. Follow system leak test instructions provided with tester. If pressure stays at more than 6 in. H2O, disconnect tester and go to next step. If pressure drops to 6 in. H2O or less, check fuel filler cap for damage. Replace cap as necessary and retest. If fuel filler cap is okay, disconnect tester and go to next step.
3. 3) Check For Small Leaks At Fuel Filler Cap Install EVAP system leak tester to fuel filler pipe. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Pressurize EVAP system to 14 in. H2O. Using leak detector provided with test kit, check for leakage at fuel filler cap area and evaporative test port. If no leak is indicated, unable to duplicate fault at this time. If a leak is indicated, replace fuel filler cap or evaporative test port (test port may be part of EVAP CANP valve) and repeat this step to verify repair. If leak is still indicated, go to next step. If no leak is indicated, testing is complete.
4. 4) Leak Test System With Tester At Fill Position Connect EVAP system leak tester to evaporative test port. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Select ALL OFF mode and push START button. Regulate gas pressure on tester to 14 in. H2O. Follow system leak test instructions provided with tester. Turn selector on tester to FILL position. Pressurize EVAP system to 14 in. H2O If pressure stays at 13.8-14.2 in. H2O, go to next step. If pressure drops to less than 13.8 in. H2O, discontinue pressurizing EVAP system and go to step 6). NOTE: To ensure CV solenoid remains closed, DO NOT energize solenoid with scan tool for more than 9 minutes. If necessary, de-energize CV solenoid with some time passing then re-energize solenoid.
5. 5) Check Complete EVAP System Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Pressurize EVAP system to 14 in. H2O. Using leak detector provided with test kit, check for leakage between the following EVAP system locations: Check EVAP return tube to EVAP CANP valve. Check EVAP CANP valve to EVAP CV solenoid. Check EVAP canister to fuel tank. Check fuel filler pipe and fuel cap. If leak is detected, repair as necessary. After repair is completed, go to next step. If no leak is detected, discontinue pressurizing EVAP system and go to next step.
6. 6) Check For Leak Between EVAP Return Tube & EVAP Canister Turn ignition off. Disconnect EVAP canister tube (from fuel tank) at fuel vapor tee located between EVAP CANP valve and EVAP canister (or "F" fitting on canister). Plug or cap fuel vapor tee (or fitting on canister). Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Pressurize EVAP system to 14 in. H2O. Using leak detector provided with test kit, check for leakage at the following EVAP system locations: Check EVAP return tube. Check EVAP canister purge outlet tube. Check EVAP canister vent hose. If no leak is indicated, remove plug or cap from fuel vapor tee (or fitting on canister). Go to next step. If a leak is indicated, repair as necessary and repeat this step to verify repair. Go to next step.
7. 7) Check For Leak Between EVAP Canister Tube & Fuel Tank Turn ignition off. Remove EVAP system leak tester. Remove fuel filler cap. Install EVAP system leak tester to fuel filler pipe. Plug open end of EVAP canister tube (from fuel tank) at fuel vapor tee (or fitting on canister). Turn ignition on. Turn selector on tester to FILL position. Pressurize EVAP system to 14 in. H2O. Using leak detector provided with test kit, check for leakage at EVAP canister tube between fuel tank and EVAP canister. Also, check for leakage at fuel tank pressure sensor, fuel vapor vent valve(s) fuel vapor control valve and fuel filler pipe. If no leak is indicated, go to next step. If a leak is indicated, repair as necessary. Repeat this step to verify repair then go to next step.
8. 8) Verification Leak Check At Fuel Filler Pipe Turn ignition off. Reconnect EVAP canister tube to fuel vapor tee (or fitting on canister) Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Pressurize EVAP system to 14 in. H2O. Follow instructions provided with EVAP system leak tester and perform system leak test. If no leak is indicated, no fault is indicated at this time. Testing is complete. If a leak is indicated, return to step 4). Repair as necessary and repeat this step to verify repair. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 8) to step 10). No test procedures have been omitted.
9. 10) Continuous Memory DTC P0443 This DTC indicates an intermittent EVAP Canister Purge (CANP) valve circuit fault. Repeat «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) and KOER ON-DEMAND SELF-TEST. If DTC P0443 is present in Continuous Memory only, go to step 16). If DTC P0443 is present in KOEO or KOER self-test, go to next step.
10. 11) DTC P0443: Check VPWR Circuit Voltage Turn ignition off. Disconnect EVAP CANP valve connector. Turn ignition on. Measure voltage between VPWR terminal at EVAP CANP valve wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit. NOTE: To check EVAP CANP valve resistance, engine must be cold.
11. 12) Check EVAP CANP Valve Resistance Turn ignition off. Measure resistance between EVAP CANP valve terminals. If resistance is 30-38 ohms, go to next step. If resistance is not 30-38 ohms, replace EVAP CANP valve.
12. 13) Check EVAP Canister Purge (CANP) Valve Circuit Resistance Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 56 at breakout box and EVAP CANISTER PURGE terminal at EVAP CANP valve wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in EVAP CANISTER PURGE circuit.
13. 14) Check Circuit For Short To PWR GND Disconnect scan tool from DLC. Measure resistance between test pin No. 56 and test pins No. 24 and 103 at breakout box. If any resistance reading is 10,000 ohms or less, repair EVAP CANISTER PURGE circuit short to PWR GND circuit. If both resistance readings are more than 10,000 ohms, go to next step.
14. 15) Check Circuit For Short To VPWR Turn ignition on. Measure voltage between test pin No. 56 and test pins No. 51 and 103 at breakout box. If any voltage reading is more than 10.5 volts, repair EVAP CANP PURGE circuit short to VPWR circuit. If both voltage readings are 10.5 volts or less, replace PCM.
15. 16) Perform Wiggle Test Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Using DVOM, measure resistance between test pins No. 56 and 71 at breakout box. Observe DVOM for indication of fault while shaking and bending EVAP CANP valve wiring harness and connector. A fault will be indicated by resistance changing to less than 30 ohms or more than 38 ohms. Tap lightly on EVAP CANP valve to simulate road shock. If fault is indicated, isolate fault and repair as necessary. If no fault is indicated, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 18). No test procedures have been omitted.
16. 18) Continuous Memory DTC P1450 This DTC indicates that PCM has detected EVAP control system has excessive fuel tank vacuum. Possible causes are: EVAP canister purge tube blocked or kinked. Fuel vapor elbow on EVAP canister is contaminated. Restricted EVAP canister. Canister Vent (CV) solenoid stuck closed. Plugged or contaminated CV solenoid filter. EVAP Canister Purge (CANP) valve stuck open. Fuel filler cap stuck closed (no vacuum relief). Open in VREF circuit. Faulty Fuel Tank Pressure (FTP) sensor. Check for kinks in fuel vapor hoses/tubes. Visually inspect EVAP canister inlet port, CV solenoid filter and canister vent hose for contamination or debris. Repair as necessary and go to next step. If no faults are found, go to next step.
17. 19) Check For Blockage Disconnect and plug EVAP return tube (EVAP CANP valve-to-intake manifold) at intake manifold vacuum source. Plug CV solenoid (or filter) or plug canister vent hose. Locate evaporative test port (marked EVAPORATIVE SERVICE PORT) between EVAP CANP valve and EVAP canister. Install EVAP System Leak Tester (134-00056) including compressed gas source (nitrogen or argon) and pressure regulator to test port. Regulate gas pressure on tester to 14 in. H2O. Using instructions provided with EVAP system leak tester, pressurize EVAP system. Remove plug from CV solenoid (or filter) or from canister vent hose. If pressure drops rapidly, remove EVAP system leak tester and go to next step. If pressure does not drop rapidly, blockage exists. Check the following: Check for faulty vent solenoid. Check for faulty or plugged EVAP canister. Check for kinked, plugged or damaged EVAP hoses/tubes. Repair as necessary and repeat this step to verify repair. Go to step 22). NOTE: When checking EVAP system for leaks or blockage, energize (close) Canister Vent (CV) solenoid for a maximum of 9 minutes per test step. Then de-energize CV solenoid prior to performing the next test step. This is done to ensure proper closing of CV solenoid.
18. 20) Pressure Check Fuel Filler Cap Install EVAP system leak tester to fuel filler pipe. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Pressurize EVAP system to 14 in. H2O. Using leak detector provided with test kit, check for leakage at fuel filler cap area and evaporative test port. If no leak is indicated, go to next step. If a leak is indicated, replace fuel filler cap or evaporative test port (test port may be part of EVAP CANP valve) and repeat this step to verify repair. Go to next step.
19. 21) Check For Blockage With Fuel Filler Cap Removed Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Pressurize EVAP system to 14 in. H2O. Remove fuel filler cap. If pressure drops rapidly, remove EVAP system leak tester and go to next step. If pressure does not drop rapidly, blockage exists. Check the following: Check for faulty vent solenoid. Check for faulty or plugged EVAP canister. Check for kinked, plugged or damaged EVAP hoses/tubes. Repair as necessary and repeat this step to verify repair then go to next step.
20. 22) Check Fuel Tank Pressure Sensor Parameter Identification (PID) Remove fuel filler cap. Turn ignition on. Using scan tool, select FTP V PID. If PID voltage is 2.4-2.8 volts, install fuel filler cap and go to next step. If PID voltage is not 2.4-2.8 volts, go to step 24).
21. 23) Check For Stuck Open EVAP CANP Valve Turn ignition off. Remove plug from CV solenoid (or filter) or from plug canister vent hose (if not done previously). Remove plug and reconnect EVAP return tube (EVAP CANP valve-to-intake manifold) at intake manifold vacuum source. Ensure fuel filler cap is installed. Turn ignition on. Using scan tool, select FTP V and EVAPPDC PIDs. Start engine. When EVAPPDC PID reading is zero, if FTP V PID voltage is less than 2.4 volts, EVAP CANP valve is stuck open. Replace EVAP CANP valve. When EVAPPDC PID reading is zero, if FTP V PID voltage is 2.4 volts or more, blockage still exists in EVAP system between evaporative test port and fuel tank or between EVAP canister and CV solenoid. Repair as necessary or return to step 19) to help determine blockage location.
22. 24) Check Voltage Between VREF & SIG RTN Circuits Turn ignition off. Disconnect FTP sensor connector, located on top of fuel tank. Turn ignition on. Measure voltage between VREF and SIG RTN terminals at FTP sensor wiring harness connector. If voltage is 4-6 volts, replace FTP sensor. If voltage is not 4-6 volts, go to next step.
23. 25) Check For Open VREF Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 90 and VREF terminal at FTP sensor wiring harness connector. If resistance is less than 5 ohms, replace PCM. Go to step 22) to verify repair. If resistance is 5 ohms or more, repair open in VREF circuit. Go to step 22) to verify repair.
24. 26) DTC P0452: Check FTP Sensor Connector This DTC indicates FTP circuit input is below minimum. Turn ignition off. Visually inspect FTP sensor for liquid fuel contamination. FTP sensor is located on top of fuel tank. Repair as necessary. If connector is okay, go to next step.
25. 27) Check FTP Sensor Voltage Turn ignition on. Using scan tool, select FTP V PID. If PID voltage is less than .22 volt, go to next step. If voltage is .22 volt or more, fault is intermittent. Go to step 31).
26. 28) Check Opposite Induced High FTP Signal Turn ignition off. Disconnect FTP sensor connector. Connect a jumper wire between VREF and FTP terminals at FTP sensor wiring harness connector. Turn ignition on. If scan tool communication link error is displayed, remove jumper wire and go to step 29). Using scan tool, select FTP V PID. If PID voltage is not 4-6 volts, remove jumper wire and go to next step. If PID voltage is 4-6 volts, replace FTP sensor.
27. 29) Check Voltage At FTP Sensor Connector Measure voltage between VREF and SIG RTN terminals at FTP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF voltage is out of range. Go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
28. 30) Check For Short Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Disconnect scan tool from DLC. Measure resistance between test pin No. 62 and test pins No. 51 and 103 at breakout box. If both resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is 10,000 ohms or less, repair FTP circuit short to SIG RTN or PWR GND circuit.
29. 31) Check For Intermittent Short To Ground Reconnect scan tool to DLC. Turn ignition on. Using scan tool, select FTP V PID. Observe FTP V PID for indication of fault while shaking and bending FTP sensor wiring harness and connector. A fault will be indicated by a sudden change in FTP V PID voltage. Tap lightly on sides of FTP sensor to simulate road shock. DO NOT tap on top of sensor. If fault is indicated, isolate fault and repair as necessary. If no fault is indicated, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 31) to step 33). No test procedures have been omitted.
30. 33) DTC P0453: Check FTP Sensor Voltage Turn ignition on. Using scan tool, select FTP V PID. If PID voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, fault is intermittent. Go to step 42).
31. 34) Check For Short To Power Turn ignition off. Disconnect FTP sensor connector, located on top of fuel tank. Turn ignition on. Measure voltage between FTP terminal at FTP sensor wiring harness connector and negative battery terminal. If voltage is 10.5 volts or less, go to step 36). If voltage is more than 10.5 volts, go to next step.
32. 35) Check FTP Circuit For Short To VPWR Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 62 and 103 at breakout box. If voltage is more than 10.5 volts, repair short circuit. If voltage is 10.5 volts or less, replace PCM.
33. 36) Check Opposite Induced Low FTP Signal Turn ignition off. Connect a jumper wire between SIG RTN and FTP terminals at FTP sensor wiring harness connector. Turn ignition on. If scan tool communication link error is displayed, remove jumper wire and go to step 41). Using scan tool, select FTP V PID. If PID voltage is less than .1 volt, remove jumper wire and go to next step. If PID voltage is .1 volt or more, unable to induce opposite signal. Go to step 39).
34. 37) Check Voltage At FTP Sensor Connector Measure voltage between VREF and SIG RTN terminals at FTP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF voltage is out of range. Go to «CIRCUIT TEST C»(ref-131243-S27286541052001123100000) .
35. 38) Check For Short Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 62 and 90 at breakout box. If resistance is more than 10,000 ohms, replace FTP sensor. If resistance is 10,000 ohms or less, repair FTP circuit short to VREF circuit.
36. 39) Check For Open FTP Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 62 at breakout box and FTP terminal at FTP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in FTP circuit.
37. 40) Check For Open SIG RTN Circuit Measure resistance between test pin No. 91 at breakout box and SIG RTN terminal at FTP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in SIG RTN circuit.
38. 41) Check FTP Circuit For Short To VREF Circuit Measure resistance between test pins No. 62 and 90 at breakout box. If resistance is more than 10,000 ohms, replace PCM. If resistance is 10,000 ohms or less, repair FTP circuit short to VREF circuit.
39. 42) Check For Intermittent Open Or Short To Power Turn ignition on. Using scan tool, select FTP V PID. Observe FTP V PID for indication of fault while shaking and bending FTP sensor wiring harness and connector. A fault will be indicated by a sudden change in FTP V PID voltage. Tap lightly on sides of FTP sensor to simulate road shock. DO NOT tap on top of sensor. If fault is indicated, isolate fault and repair as necessary. If no fault is indicated, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 42) to step 44). No test procedures have been omitted.
40. 44) Continuous Memory DTC P0445 This DTC indicates a large fuel vapor leak or no purge flow has been detected. Check the following for possible cause for this fault: Faulty aftermarket EVAP system components. Faulty fuel filler cap. Faulty fuel vapor hoses or tubes. Faulty EVAP system components. CV solenoid partially stuck open. Faulty Fuel Tank Pressure (FTP) sensor. Faulty EVAP canister. If no faults are found, go to next step. If any faults are found, repair as necessary. After repair is completed, go to next step. NOTE: When checking EVAP system for leaks or blockage, energize (close) Canister Vent (CV) solenoid for a maximum of 9 minutes per test step. Then de-energize CV solenoid prior to performing the next test step. This is done to ensure proper closing of CV solenoid.
41. 45) Check For EVAP System Leaks Disconnect and plug EVAP return tube (EVAP CANP valve-to-intake manifold) at intake manifold vacuum source. Turn ignition on. Using scan tool, select VPWR PID from PID/DATA monitor menu. If PID voltage is less than 12 volts, go to step 61). If PID voltage is 12 volts or more, locate evaporative test port (marked EVAPORATIVE SERVICE PORT) between EVAP CANP valve and EVAP canister. If vehicle does not have a test port, go to step 50). Install EVAP System Leak Tester (134-00056) including compressed gas source (nitrogen or argon) and pressure regulator to test port. Using scan tool, energize CV solenoid by entering OUTPUT TEST MODE, and commanding all outputs ON. Select ALL OFF mode and press START button on scan tool. Regulate gas pressure on tester to 14 in. H2O. Using instructions provided with EVAP system leak tester, pressurize EVAP system. Follow system leak test instructions provided with tester. If pressure stays at more than 6 in. H2O, go to next step. If pressure drops to 6 in. H2O or less, remove EVAP system leak tester and go to step 50).
42. 46) Check For Blockage Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Pressurize EVAP system to 14 in. H2O. Command all outputs OFF. If pressure drops rapidly, go to step 48). If pressure does not drop rapidly, go to next step.
43. 47) Check For Blockage Between EVAP CANP Valve & EVAP Canister Disconnect and plug EVAP canister purge outlet tube (between EVAP CANP valve and EVAP canister) at EVAP canister. Re-pressurize system to 14 in. H2O. Remove plug from outlet tube. If system does not immediately lose pressure, remove blockage or contamination from EVAP canister purge outlet tube, or replace tube. Go to step 46) to verify repair. If system immediately releases pressure, check the following: Check for faulty vent solenoid. Check for faulty or plugged EVAP canister. Check for kinked, plugged or damaged EVAP hoses/tubes. Repair as necessary. Repeat test step 46) to verify repair and go to next step.
44. 48) Check For Blockage Between EVAP Test Port & Fuel Tank Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Pressurize EVAP system to 14 in. H2O. Remove fuel filler cap. If pressure drops to zero, leave fuel filler cap off and go to step 56). If pressure does not drop to zero, remove EVAP system leak tester and go to next step.
45. 49) Check For Blockage Between Fuel Tank & EVAP Canister Tube Install EVAP system leak tester at fuel filler pipe. Disconnect and plug EVAP canister tube (from fuel tank) at fuel vapor tee located between EVAP CANP valve and EVAP canister (or "F" fitting on canister). Turn ignition on. Pressurize EVAP system to 14 in. H2O. Remove plug from EVAP canister tube. If pressure drops, install fuel filler cap, EVAP canister tube and go to step 56). If pressure does not drop, check the following: Check for faulty vent solenoid. Check for faulty or plugged EVAP canister. Check for kinked, plugged or damaged EVAP hoses/tubes. Repair as necessary. Repeat step 48) to verify repair. Leave fuel filler cap off and go to step 56).
46. 50) Check For Leaks At Fuel Filler Cap Area Install EVAP system leak tester to fuel filler pipe. Using scan tool, energize CV solenoid by entering OUTPUT TEST MODE, and commanding all outputs ON. Pressurize EVAP system to 14 in. H2O. Follow system leak test instructions provided with tester and check for leaks around fuel filler cap. If no leak is detected, remove EVAP system leak tester and install fuel filler cap. Go to next step. If a leak is detected, replace fuel filler cap and repeat this step to verify repair. If leak is still indicated, go to next step. If no leak is indicated, testing is complete.
47. 51) Check EVAP Canister Plug CV solenoid (or filter) or plug canister vent hose. Locate evaporative test port (marked EVAPORATIVE SERVICE PORT) between EVAP CANP valve and EVAP canister and install EVAP system leak tester. Pressurize EVAP system to 14 in. H2O. Using leak detector provided with test kit, check for leakage at EVAP canister and CV solenoid assembly. If no leak is indicated, go to next step. If a leak is indicated, repair as necessary. Repeat step 45) to verify repair. If leak is still indicated, go to next step. If no leak is indicated, testing is complete.
48. 52) Check For Leak Between EVAP Test Port & EVAP Canister Disconnect EVAP canister tube (from fuel tank) at fuel vapor tee located between EVAP CANP valve and EVAP canister (or "F" fitting on canister). Plug or cap fuel vapor tee (or fitting on canister). Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Command all outputs ON. Pressurize EVAP system to 14 in. H2O. Using leak detector provided with test kit, check for leakage at EVAP return tube between intake manifold source and EVAP canister. If leak is detected, repair as necessary. After repair is completed reconnect all components and go to next step. If no leak is detected, go to step 54).
49. 53) Verify Repair Disconnect and plug EVAP return tube (EVAP CANP valve-to-intake manifold) at intake manifold vacuum source. Locate evaporative test port (marked EVAPORATIVE SERVICE PORT) between EVAP CANP valve and EVAP canister. Install EVAP system leak tester to test port. Using scan tool, energize CV solenoid by entering OUTPUT TEST MODE, and commanding all outputs ON. Select ALL OFF mode and press START button on scan tool. Regulate gas pressure on tester to 14 in. H2O. Using instructions provided with EVAP system leak tester, pressurize EVAP system. If pressure stays at more than 6 in. H2O, remove EVAP system leak tester. Leave fuel filler cap off and go to step 56). If pressure drops to 6 in. H2O or less, remove EVAP system leak tester and go to next step.
50. 54) Check For Leak Between EVAP Canister Tube & Fuel Tank Turn ignition off. Disconnect EVAP canister tube (from fuel tank) at fuel vapor tee located between EVAP CANP valve and EVAP canister (or "F" fitting on canister). Plug or cap fuel vapor tee (or fitting on canister). Install EVAP system leak tester to fuel filler pipe. Pressurize EVAP system to 14 in. H2O. Using leak detector provided with test kit, check for leakage at the following components. Fuel filler pipe. Fuel tank. Fuel vapor control valve tube assembly. FTP sensor. EVAP canister tube between fuel vapor control valve and EVAP canister. Repair as necessary. After repair is completed, go to next step to verify repair. If no leak is detected, remove plug from EVAP canister tube. Reconnect EVAP canister tube and install fuel filler cap. Remove EVAP system leak tester from fuel filler pipe and install at EVAP test port. Perform step 53) to verify leak no longer exists. After test is completed, remove fuel filler cap and go to step 56).
51. 55) Verify Repair Pressurize EVAP system to 14 in. H2O. If pressure drops to 6 in. H2O or less, leak in EVAP system still exists. Repeat step 54) to isolate leak and repair as necessary. If pressure stays at more than 6 in. H2O, remove plug from EVAP canister tube and reconnect tube. Install fuel filler cap. Remove EVAP system leak tester from fuel filler pipe and install at EVAP test port. Perform step 53) to verify leak no longer exists. After test is completed, remove fuel filler cap and go to next step.
52. 56) Check FTP Sensor Operation Turn ignition on. Using scan tool, select VPWR PID. If PID voltage is 10.5 volts or less, go to step 61). After completing step, return to this test step and continue testing. If PID voltage is more than 10.5 volts, select FTP V PID. If PID voltage is 2.4-2.8 volts, go to next step. If PID voltage is not 2.4-2.8 volts, replace FTP sensor. Repeat this step to verify repair, then go to next step.
53. 57) FTP Sensor Functional Check Install EVAP leak tester to fuel filler pipe. Plug canister vent hose or close CV solenoid to atmosphere by taping CV filter shut. Turn ignition on. Using scan tool, select FTP V PID. Pressurize EVAP system to 14 in. H2O. If PID voltage is 4.2-4.9 volts, remove EVAP system leak tester. Remove plug from vent hose or remove tape from CV solenoid filter. Install fuel filler cap and go to next step. If PID voltage is not 4.2-4.9 volts, replace FTP sensor. Repeat step 56) to verify repair.
54. 58) Check For EVAP CANP Valve Operation Turn ignition off. Remove plug and connect EVAP return tube at intake manifold vacuum source. Turn ignition on. Using scan tool, select EVAPPDC and FTP V PIDs. Start engine and observe EVAPPDC PID value. Idle engine until EVAPPD PID reaches 40 percent duty cycle. If FTP V PID voltage is less than 2.6 volts, no problem is indicated at this time. Testing is complete. If FTP V PID voltage is 2.6 volts or more, go to next step.
55. 59) Check Intake Manifold Vacuum To EVAP CANP Valve Turn ignition off. Disconnect input port vacuum hose and EVAP return tube at EVAP CANP valve. Install vacuum gauge to open end of input port vacuum hose and plug open end of EVAP return tube. Start engine. Note vacuum gauge reading. Turn ignition off. Install vacuum gauge to EVAP return tube and plug open end of input port vacuum hose. Start engine and note vacuum gauge reading. If both vacuum readings are 14-20 in. Hg, replace EVAP CANP valve. If both vacuum gauge readings are not 14-20 in. Hg, check for blockage in input port vacuum hose or EVAP return tube. Check intake manifold vacuum tree or port for blockage. Repair as necessary. Repeat step 58) to verify repair. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 59) to step 61). No test procedures have been omitted.
56. 61) Check Battery Voltage Turn ignition off. Measure voltage across battery terminals. If voltage is 12 volts or more, return to step that directed you here and continue EVAP system leak test. If voltage is less than 12 volts, recharge battery and return to step that directed you here and continue EVAP system leak test. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 61) to step 65). No test procedures have been omitted.
57. 65) DTC P1451: Check Voltage To Canister Vent (CV) Solenoid This DTC indicates an CV solenoid circuit fault. Possible causes are: Open VPWR circuit. Open or shorted CV circuit. Faulty CV solenoid. Faulty PCM. Turn ignition off. Disconnect CV solenoid connector. Turn ignition on. Measure voltage between VPWR terminal at CV solenoid wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit.
58. 66) Check CV Solenoid Resistance Turn ignition off. Measure resistance between CV solenoid terminals. If resistance is 48-65 ohms, go to next step. If resistance is not 48-65 ohms, replace CV solenoid.
59. 67) Check CV Circuit Resistance Disconnect PCM 104-pin wiring harness connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 67 at breakout box and CV terminal at CV solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in VREF circuit.
60. 68) Check CV Circuit Short To PWR GND Disconnect scan tool. Measure resistance between test pin No. 67 and test pins No. 51 and 103 at breakout box. If any resistance reading is less than 10,000 ohms, repair CV circuit short to PWR GND. If both resistance readings are 10,000 ohms or more, reconnect scan tool and go to next step.
61. 69) Check CV Circuit Short To PWR Turn ignition on. Measure voltage between chassis ground and test pin No. 67 at breakout box. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair CV circuit short to PWR, VREF, VPWR or chassis ground.
62. 70) Check CV Signal From PCM Turn ignition off. Reconnect CV solenoid connector. Connect PCM to breakout box. Start engine and allow to idle. Measure voltage between test pin No. 67 and test pin No. 51 or 103 at breakout box. If voltage is 10-14 volts, replace CV solenoid. If voltage is not 10-14 volts, replace PCM.
63. 76) DTC P0460: Check Fuel Tank Level Indicators This DTC indicates a Fuel Level Input (FLI) circuit fault. Possible causes are: Empty fuel tank. Overfilled fuel tank. Faulty fuel pump. Faulty fuel gauge or instrument cluster. FLI circuit fault. CASE GND circuit shorted to VPWR. Faulty PCM. Turn ignition on. Note fuel gauge reading. Using scan tool, select FLI PID. If both fuel gauge and FLI PID readings are between 1/4 (25 percent for FLI PID) and 3/4 (75 percent for FLI PID), go to step 78). If readings are not as specified, inspect fuel tank for leaks. Repair as necessary and retest. If fuel tank is okay, go to next step (for DTC P0460) or go to «TESTS W/O CODES»(ref-131532) article for additional symptoms.
64. 77) Check For Low Fuel Flow Turn ignition on. While observing both fuel gauge and FLI PID, add 2-3 gallons of fuel to fuel tank. If fuel gauge or FLI PID reading does not increase, go to step 81). If either fuel gauge or FLI PID reading increases as fuel is added, drain or fill fuel tank so fuel level is 25-75 percent full. Clear DTCs. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If DTC P0460 is still present, go to step 79).
65. 78) Check FLI Voltage Start engine. Using scan tool, select FLI V PID. If PID voltage is .9-2.5 volts, check for a mechanically stuck fuel pump. Repair as necessary. If voltage is not as specified, go to next step.
66. 79) Check FLI Voltage Using Breakout Box Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950). Connect PCM to breakout box. Using scan tool, select FLI V PID. Note PID voltage reading. Measure voltage between test pin No. 12 or No. 9 and test pin No. 91 at breakout box. If both voltage readings are .9-2.5 volts, go to next step. If voltage is not as specified, check fuel gauge for proper installation. Repair as necessary and repeat this step to verify repair. If fuel gauge installation is okay and one voltage reading is not as specified, replace PCM. If fuel gauge installation is okay and both voltage readings are not as specified, go to step 81).
67. 80) Check CAS GND PID Start engine. Using scan tool, select CAS GND PID. Note PID voltage reading. Measure voltage between test pins No. 25 and 91 at breakout box. If both voltage readings are .3 volt or less, reconnect all components. Clear DTCs. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If DTC P0460 is still present, check for open fuel gauge/instrument cluster CASE GND circuit, faulty fuel gauge or faulty instrument panel. Repair as necessary.
68. 81) Check Fuel Pump Resistance Disconnect fuel pump module connector. Measure resistance between CASE GND terminal and FLI terminal at fuel pump module pigtail connector. If resistance is 15-160 ohms, reconnect fuel pump module and go to next step. If resistance is not 15-160 ohms, replace fuel pump module.
69. 82) Check For Short To VPWR Ensure ignition is off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950). Connect PCM to breakout box. Turn ignition on. Measure voltage between test pin No. 12 or No. 9 and test pin No. 51 or 103 at breakout box. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, go to step 84).
70. 83) Check FLI & CASE GND Circuits Disconnect PCM from breakout box. Measure voltage between test pin No. 12 or No. 9 and test pin No. 51 or 103. Also, measure voltage between PCM test pin No. 25 and test pin No. 51 or 103. If both voltage readings are 10.5 volts or less, replace PCM. If any voltage reading is more than 10.5 volts, repair short to VPWR in FLI or CASE GND circuits.
71. 84) Check FLI Circuit For Open Or Short To GND Turn ignition off. Disconnect battery terminals. Measure resistance between test pins No. 12 or No. 9 and test pin No. 25 at breakout box. If resistance is 15-187 ohms, reconnect all components. Clear DTCs and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If DTC P0460 is still present, replace PCM. If resistance is not 15-187 ohms, repair CASE GND or FLI circuit.

CIRCUIT TEST JB - SECONDARY IGNITION

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

1. 1) Preliminarily Test Ensure battery is fully charged and all accessories are off. Check all wiring harnesses and connectors for damage, and burned or overheated insulation. Repair as necessary. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If no problems are found, go to next step (if using engine analyzer) or go to step 20) (if not using engine analyzer).
2. 2) Connect Engine Analyzer DTC P0350 indicates an ignition coil primary circuit malfunction. Install Rotunda Engine Analyzer (010-00869) engine analyzer. If vehicle has a no-start condition, go to next step. If vehicle starts, go to step 4).
3. 3) Check For Normal Ignition Pattern Crank engine and observe scope pattern. If scope pattern is normal, go to «CIRCUIT TEST A»(ref-131243-S24299898242001123100000) , step 7). If scope pattern is not normal, repair IGN START run circuit (no-start condition) or go to next step (if vehicle starts).
4. 4) Check For Normal Ignition Operation Start engine. Select Multi-Strike operating mode on engine analyzer. Multi-Strike operating mode is dependent on PCM calibration and is limited to less than 2000 RPM. Observe scope pattern and check average spark output voltage and variation of pattern. If average spark output firing voltage is 20,000 or less with output variation 8000 volts or less, no problem is indicated at this time. Testing is complete. If DTCs P0300-P0310 are present, check fuel pressure. See «CIRCUIT TEST HD»(ref-131243-S13555492582001123100000) , step 5). If directed here from TESTS W/O CODES - EEC-V article, return to symptom test that directed you here. On all others, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . If spark output voltage is not as specified, go to step 12) (models equipped with coil on plug system).
5. 5) Check Spark Voltage Check spark output voltage for all cylinders. If average spark output voltage is more than 20,000 volts with spark output variation less than 8000 volts, check spark plugs for wear and spark plug wires for 7000 ohms per foot maximum resistance. Repair as necessary. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If spark output voltage is not as specified, go to next step.
6. 6) Check For Voltage Variation Between Cylinders If spark output voltage variation is more than 8000 volts, check spark plugs for wide gap or worn electrode. Repair as necessary. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If spark output voltage variation is less than 8000 volts, go to next step.
7. 7) Check For High Spark Voltage If spark output voltage is consistently high in one or more cylinders, check for defective spark plug or wire. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If spark output voltage is not consistently high in one or more cylinders, go to next step.
8. 8) Check For Low Spark Voltage If spark output voltage is consistently low in one or more cylinders, go to next step. If spark output voltage is not consistently low in one or more cylinders, proceed as follows: If DTCs P0300-P0310 are present, go to «CIRCUIT TEST HD»(ref-131243-S13555492582001123100000) , step 5). If directed here from TESTS W/O CODES - EEC-V article, return to symptom test that directed you here. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 8) to step 12). No test procedures have been omitted.
9. 12) Check For High Spark Voltage Observe scope pattern and check average spark output voltage and variation of pattern. If average spark output firing voltage is more than 20,000 with output variation 8000 volts or less, check spark plugs for wear. Check ignition coil for proper installation. Repair as necessary. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If spark output voltage is not as specified, go to next step.
10. 13) Check For Voltage Variation Between Cylinders If spark output voltage variation is more than 8000 volts, check spark plugs for wide gap or worn electrode. Repair as necessary. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If spark output voltage variation is less than 8000 volts, go to next step.
11. 14) Check For High Spark Voltage If spark output voltage is consistently high in one or more cylinders, ignition coils are not firmly connected. Check ignition coil installation. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If spark output voltage is not consistently high in one or more cylinders, go to next step.
12. 15) Check For Low Spark Voltage If spark output voltage is consistently low in one or more cylinders, go to next step. If spark output voltage is not consistently low in one or more cylinders, proceed as follows: If DTCs P0300-P0310 are present, go to «CIRCUIT TEST HD»(ref-131243-S13555492582001123100000) , step 5). On all others, identify symptom and go to TESTS W/O CODES - EEC-V article.
13. 16) Check For Missing Spark Pattern If spark is not missing from any cylinder, go to next step. If spark is missing from any cylinder, check spark plug for wear. Replace as necessary and retest. If spark plug is okay, go to «CIRCUIT TEST JF»(ref-131243-S14109061052001123100000) .
14. 17) Check Inductive Voltage Check inductive voltage on each ignition wire and coil individually. If inductive voltage is not present on any ignition wire or coil, go to «CIRCUIT TEST JF»(ref-131243-S14109061052001123100000) , step 1). If inductive voltage is present on any ignition wire or coil, check spark plugs and ignition wire resistance. Replace ignition wire if resistance is greater than 7000 ohms per foot (30.5 cm). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 17) to step 20). No test procedures have been omitted.
15. 20) Check For Spark At Spark Plug Disconnect Inertia Fuel Shutoff (IFS) switch. Disconnect ignition coil or plug wire from spark plug. Install Spark Tester (303-D037) to spark plug. Crank engine. If spark is present, go to next step. If spark is not present, go to «CIRCUIT TEST JF»(ref-131243-S14109061052001123100000) .
16. 21) Check For Spark At ALL Spark Plugs Using spark tester check for spark at all plugs while cranking engine. If spark is present at all plugs, go to next step. If spark is not present at all plugs, go to «CIRCUIT TEST JF»(ref-131243-S14109061052001123100000) .
17. 22) Check Spark Quality With spark tester installed, crank engine and observe color of spark for each cylinder. If spark strong (Bluish/White), go to next step. If spark is not strong, replace ignition coil. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS.
18. 23) Check Spark Plugs Remove and inspect spark plugs for damage and wear. If spark output voltage is not as specified, go to next step. Replace plugs as necessary. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. If spark plugs are okay, proceed as follows: If sent here from CIRCUIT TEST HD, step 4), go to «CIRCUIT TEST HD»(ref-131243-S13555492582001123100000) , step 5). If directed here from TESTS W/O CODES - EEC-V article, return to symptom test that directed you here. On all other models, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) .

CIRCUIT TEST JD - CRANKSHAFT POSITION (CKP) SENSOR

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Crankshaft Position (CKP) sensor.
2. CKP wiring harness or connector(s).
3. Faulty Powertrain Control Module (PCM).

Identifying CKP Sensor Circuits & Connector Terminals. Scheme 45

1. 1) Check CKP+ Circuit To PCM Turn ignition off. Disconnect scan tool from DLC. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950). Connect PCM to breakout box. Turn ignition on. Measure voltage between test pin No. 21 (CKP+) at breakout box and negative battery terminal. If voltage is not 1-2 volts, go to next step. If voltage is 1-2 volts, go to step 10).
2. 2) Check For CKP+ Voltage Fault Turn ignition off. Disconnect CKP sensor connector. Turn ignition on. Measure voltage between test pin No. 21 (CKP+) at breakout box and negative battery terminal. If voltage is more than one volt, but less than 2 volts, go to next step. If voltage is not as specified, go to step 18).
3. 3) Check For CKP- Voltage Fault Ensure ignition is on. Measure voltage between test pin No. 22 at breakout box and negative battery terminal. If voltage is 1-2 volts, replace CKP sensor. If voltage is not 1-2 volts, go to next step.
4. 4) Determine Fault If voltage reading in step 3) is less than one volt, go to next step. If voltage reading in step 3) is not less than one volt, go to step 6).
5. 5) Check CKP- Circuit For Short To Ground Turn ignition off. Disconnect PCM from breakout box. Measure resistance between breakout box test pin 22 and test pins No. 51 and 103 at breakout box. If both resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is less than 10,000 ohms, repair CKP- circuit short to ground.
6. 6) Check CKP- Sensor For Short To Power Turn ignition on. Measure voltage between breakout box test pins 22 and negative battery terminal. If voltage is .5 volt or more, repair CKP- circuit short to power. If resistance is less than .5 volt, replace PCM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.
7. 10) Check CKP Sensor Voltage At PCM While cranking engine, measure voltage between test pins No. 21 and 22 at breakout box. If A/C voltage stabilized at more than .4 volt, CKP circuit is okay. Go to «CIRCUIT TEST JB»(ref-131243-S19672241292001123100000) . If voltage is .4 volt or less, go to next step.
8. 11) Check CKP Sensor Voltage At PCM Disconnect PCM 104-pin connector. While cranking engine, measure voltage between test pins No. 21 and 22 at breakout box. If A/C voltage stabilized at more than .4 volt, replace PCM. If voltage is .4 volt or less, go to next step.
9. 12) Check CKP Circuit Resistance Turn ignition off. Measure resistance between test pins No. 21 and 22 at breakout box. If resistance is 300-800 ohms, go to step 16). If resistance is not 300-800 ohms, go to next step.
10. 13) Determine Fault If resistance is less than 300 ohms in step 12), go to step 17). If resistance is not less than 300 ohms in step 12). go to next step.
11. 14) Check For Open Circuit Disconnect CKP sensor connector. Measure resistance between test pin No. 21 at breakout box and CKP+ terminal at CKP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in CKP+ circuit.
12. 15) Check For Open Circuit Measure resistance between test pin No. 22 at breakout box and CKP- terminal at CKP sensor wiring harness connector. If resistance is less than 5 ohms, replace CKP sensor. If resistance is 5 ohms or more, repair open in CKP- circuit.
13. 16) Check CKP Sensor & Trigger Wheel Check CKP sensor and trigger wheel for damage. Repair as necessary. If CKP sensor and trigger wheel are not damaged, replace CKP sensor.
14. 17) Check CKP+ Circuit For Short To CKP- Circuit Disconnect CKP sensor connector. Measure resistance between test pins No. 21 and 22 at breakout box. If resistance is more than 10,000 ohms, replace CKP sensor. If resistance is 10,000 ohms or less, CKP+ circuit is shorted to CKP- circuit. Repair as necessary.
15. 18) Determine Fault If voltage reading in step 2) is less than one volt, go to next step. If voltage reading in step 3) is not less than one volt, go to step 20).
16. 19) Check CKP+ Circuit For Short To Ground Turn ignition off. Disconnect PCM from breakout box. Measure resistance between breakout box test pin 21 and test pins No. 51 and 103 at breakout box. If both resistance readings are more than 10,000 ohms, replace PCM. If any resistance reading is less than 10,000 ohms, repair CKP+ circuit short to ground.
17. 20) Check CKP+ Sensor For Short To Power Turn ignition on. Measure voltage between breakout box test pins 21 and negative battery terminal. If voltage is .5 volt or more, repair CKP+ circuit short to power. If resistance is less than .5 volt, replace PCM.

CIRCUIT TEST JF - INTEGRATED IGNITION COIL ON PLUG FAILURE

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS. After drive cycle is completed, repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Ignition coils.
2. Ignition coils harness.
3. Powertrain Control Module (PCM).

Identifying Coil On Plug Ignition Coil Test Circuit & Connector Terminals. Scheme 46

Ignition Coil-To-Cylinder Correlation. Scheme 47

1. 1) Determine Which Coil Is Not Firing Using engine analyzer, ignition coil-to-cylinder correlation chart, determine which coil is not firing. (Scheme 47) Record cylinder, coil and PCM test pin number and go to step 3). NOTE: Performing «CIRCUIT TEST JB»(ref-131243-S19672241292001123100000) and using test results can help determine which coil is not firing.
2. 2) Determine Which Coil Is Not Firing Using DTC and coil-to-cylinder correlation chart, determine which coil is not firing. (Scheme 47) Record cylinder, coil and PCM test pin number and go to next step.
3. 3) Check Coil Operation DTCs P0350-P0360 indicate ignition coil 1-10 primary circuit faults. Possible causes are: Open or short in IGN START/RUN circuit. Open or short to ground in CD circuit. Faulty ignition coil. Faulty PCM. Disconnect suspect coil. Connect a test light between suspect coil wiring harness connector terminals. Disconnect inertia fuel shutoff switch connector. Crank engine and observe test light. If test light blinks consistently, coil circuit is okay. Go to next step. If test light does not blink consistently, go to step 5).
4. 4) Check Coil Turn ignition off. Remove suspect coil. Install Spark Tester (D81P-666-A) to suspect coil. Reconnect coil connector. Observe spark tester and crank engine. If spark is not present, replace coil. Inspect spark plug and replace as necessary. If spark is present, check spark plug. Replace as necessary and retest. If spark plug is okay, no fault is present at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).
5. 5) Check IGN START/RUN Voltage To Coil Turn ignition on. Measure voltage between IGN START/RUN terminal at suspect coil wiring harness connector and chassis ground. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check condition of related fuses/fuse links. If fuse/fuse links are blown, check for short to ground. Repair as necessary. If fuse/fuse links are okay, repair open in IGN START/RUN circuit.
6. 6) Check Coil Driver Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950). Measure resistance of CD circuit between appropriate CD circuit test pin at breakout box (determined from coil-to-cylinder correlation chart) at suspect coil wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in CD circuit.
7. 7) Check CD Circuit For Short To VPWR Turn ignition on. Measure resistance between appropriate CD circuit test pin at breakout box (determined from coil-to-cylinder correlation chart) and chassis ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair CD circuit short to VPWR circuit.
8. 8) Check CD Circuit For Short To Ground Turn ignition off. Disconnect scan tool from DLC. Measure resistance between test pin No. 77 and appropriate CD circuit test pin at breakout box (determined from coil-to-cylinder correlation chart). If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in CD circuit.
9. 9) Check Coil Driver For Short To Ground Connect PCM to breakout box. Connect a test light between test pin No. 97 and appropriate CD circuit test pin at breakout box (determined from coil-to-cylinder correlation chart). Turn ignition on. If test light is off, go to next step. If test light is on, CD circuit is shorted in PCM. Replace PCM.
10. 10) Check Coil Driver Operation With test light still connected, crank engine. If test light blinks consistently, go to next step. If test light does not blink consistently, replace PCM. Reconnect all components. Clear DTCs. If symptom or DTC is still present, coil may be damaged also. Go to next step.
11. 11) Check Coil Turn ignition off. Remove suspect coil. Connect Spark Tester (D81P-6666-A) to suspect coil. Observe spark tester and crank engine. If spark is present, inspect spark plug and replace as necessary. If spark plug is okay, testing is complete. If spark is not present, replace coil. Inspect spark plug and replace as necessary. If spark plug is okay, testing is complete.

CIRCUIT TEST JH - TACHOMETER OUTPUT FAILURE

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly.

Perform this test when instructed to or if directed by other test procedures. This test is used to diagnose the following

1. Powertrain Control Module (PCM).

Identifying Instrument Cluster Test Circuit. Scheme 48

1. 1) Check CTO Circuit For Short To Power Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 48 and chassis ground. If voltage is less than .5 volt, go to next step. If voltage is .5 volt or more, repair short circuit.
2. 2) Check CTO Signal From PCM Turn ignition off. Connect PCM to breakout box. Start engine and allow to idle. Measure voltage between test pin No. 48 and chassis ground. If voltage is 3-9 volts, go to next step. If voltage is not 3-9 volts, replace PCM.
3. 3) Check For Short To Ground Turn ignition off. Disconnect PCM from breakout box. Measure resistance between test pin No. 48 and test pin No. 51 or 103. Also, measure resistance between test pin No. 48 and chassis ground. If any resistance reading is 10,000 ohms or less, repair short to ground in CTO circuit. If both resistance readings are more than 10,000 ohms, CTO circuit is okay. Check instrument cluster and repair as necessary. See INSTRUMENT PANELS article in the ACCESSORIES & EQUIPMENT section for diagnosis and testing.

CIRCUIT TEST KB - FUEL PUMP DRIVER MODULE (FPDM)

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Fuel Pump Driver Module (FPDM).
2. Inertia Fuel Shutoff (IFS) switch.
3. Wiring harness circuits (B+, FP, FPM, Ground, FP and VPWR).
4. FPDM power supply relay.
5. Powertrain Control Module (PCM).

Identifying Fuel Pump Driver Module Test Circuit & Connector Terminals. Scheme 49

1. 1) DTC P1233 Or P1234 These DTCs indicate PCM has stopped receiving diagnostic information from Fuel Pump Driver Module (FPDM). If DTC P1233 or P1234 is present in «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) , go to next step. If DTC P1233 or P1234 is not present in KOEO ON-DEMAND SELF-TEST, PCM is now receiving a signal from FPDM. Fault may have been IFS switch was tripped, then reset. If engine starts, go to step 25). If vehicle has a no-start condition, disregard DTCs P1233 and P1234 at this time and repeat «QUICK TEST»(ref-131243-S07493578722001123100000) . If any other DTCs are present, perform appropriate circuit test and repair as necessary. After repairing no-start condition, go to step 25) to diagnose intermittent causes of DTC P1233 or P1234.
2. 2) Check If Engine Starts Attempt to start engine. If engine starts, go to step 15). If engine does not start, verify IFS switch is set (button depressed) and go to next step.
3. 3) Check Power & Ground Circuits To FPDM Turn ignition off. Disconnect FPDM connector. Turn ignition on. Measure voltage between VPWR terminal and ground terminal at FPDM wiring harness connector. If voltage is more than 10.5 volts, replace FPDM. If voltage is 10.5 volts or less, go to next step.
4. 4) Check Power To FPDM Turn ignition on. Measure voltage between VPWR terminal at FPDM wiring harness connector and ground. If voltage is more than 10.5 volts, repair open ground circuit to FPDM. If voltage is 10.5 volts or less, go to step 14). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 6). No test procedures have been omitted.
5. 6) Check Battery Voltage To CCRM Turn ignition off. Disconnect CCRM connector, located in left front of engine compartment. Measure voltage between terminal No. 11 at CCRM wiring harness connector and ground. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check condition of related fuse. If fuse is blown, check for short to ground. Repair as necessary. If fuse is okay, repair open B+ circuit.
6. 7) Check For Open Circuit Measure resistance of FPDM PWR circuit between terminal No. 5 at CCRM wiring harness connector and FPDM wiring harness connector. If resistance is less than 5 ohms, replace CCRM. If resistance is 5 ohms or more, go to step 13).
7. 8) Check B+ Voltage To FPDM Power Supply Relay Disconnect FPDM power supply relay. Relay is located in power distribution box in engine compartment. Measure voltage between B+ terminal at FPDM power supply relay wiring harness connector and ground. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check condition of related fuse. If fuse is blown, check for short to ground. Repair as necessary. If fuse is okay, repair open B+ circuit.
8. 9) Check Ground Circuit Disconnect scan tool. Measure resistance of ground circuit between negative battery terminal and ground terminal at FPDM power supply relay wiring harness connector. If resistance is 5 ohms or more, repair open ground circuit to FPDM. If resistance is less than 5 ohms, go to next step.
9. 10) Check For Open FPDM PWR Circuit Measure resistance of FPDM PWR circuit between FPDM wiring harness connector and FPDM power supply relay wiring harness connector. If resistance is 5 ohms or more, go to step 13). If resistance is less than 5 ohms, reconnect FPDM and go to next step.
10. 11) Check VPWR Circuit Turn ignition on. Measure voltage between negative battery terminal and VPWR terminal at FPDM power supply relay wiring harness connector. If voltage more than 10.5 volts, replace FPDM power supply relay. If voltage is 10.5 volts or less, repair open in VPWR circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 11) to step 13). No test procedures have been omitted.
11. 13) Isolate Open In FPDM PWR Circuit Turn ignition off. Leave FPDM and FPDM power supply relay disconnected. Disconnect IFS switch. Measure resistance of FPDM PWR circuit between FPDM wiring harness connector and IFS switch wiring harness connector. Also, measure resistance of FPDM PWR circuit between FPDM power supply relay wiring harness connector and IFS switch wiring harness connector. If both resistance readings are less than 5 ohms, verify IFS switch is set (button depressed). If IFS switch is set, replace IFS switch. If resistance is 5 ohms or more, repair open in appropriate circuit.
12. 14) Isolate Open In VPWR Circuit Turn ignition off. Disconnect EEC-V power relay. Disconnect IFS switch. Measure resistance of VPWR circuit between EEC-V power relay wiring harness connector and IFS switch wiring harness connector. Also, measure resistance of VPWR circuit between FPDM wiring harness connector and IFS switch wiring harness connector. If both resistance readings are less than 5 ohms, verify IFS switch is set (button depressed). If IFS switch is set, replace IFS switch. If resistance is more than 5 ohms, repair open in VPWR circuit.
13. 15) Check For Open FPM Circuit Turn ignition off. Disconnect FPDM connector. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 40 (FPM) at breakout box and FPM terminal at FPDM wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in FPM circuit.
14. 16) Check For Short To Power Turn ignition on. Measure voltage between test pin No. 40 at breakout box and ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in FPM circuit.
15. 17) Check FPM For Short To Ground Turn ignition off. Disconnect scan tool. Measure resistance between test pin No. 40 at breakout box and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in FPM.
16. 18) Check FPM Output From FPDM Reconnect FPDM. Turn ignition on. Measure voltage between test pins No. 40 and 51 (PWR GND) at breakout box. If voltage is .2-1.0 volt, replace PCM. If voltage is not .2-1.0 volt, replace FPDM. It is normal for voltage to cycle less than .02 and return to .02-1.0 volt. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 18) to step 25). No test procedures have been omitted.
17. 25) Check For Intermittent Short Or Open Circuit Turn ignition on. Using scan tool, select FP M PID from PID/DATA monitor menu. Observe FP M PID value for indication of fault while performing the following. Fault will be indicated if FP M PID changes to less than 20 percent or changes to more than 80 percent. Wiggle and bend all FPDM system related wiring harnesses and connectors. Lightly tap on IFS switch and FPDM to simulate road shock. If any faults are found, isolate fault and repair as necessary. If no faults are found, problem cannot be duplicated at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 25) to step 30). No test procedures have been omitted.
18. 30) DTC P1235 Or P1236 These DTCs indicate an FP circuit fault has been detected. This is due to an intermittent or hard fault. If DTC P1235 or P1236 is present in «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) or KOER ON-DEMAND SELF-TEST, DTC is a hard fault. Go to next step. If DTC P1235 or P1236 is not present in KOEO ON-DEMAND SELF-TEST or «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000) , fault is intermittent. Go to step 40).
19. 31) Check For Open Circuit Turn ignition off. Disconnect FPDM connector. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 80 (FP) at breakout box and FP terminal at FPDM wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in FP circuit.
20. 32) Check FP Circuit For Short To Power Turn ignition on. Measure voltage between test pin No. 80 (FP) at breakout box and ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in FP circuit.
21. 33) Check For Short To Ground Turn ignition off. Disconnect scan tool. Measure resistance between test pin No. 80 and at breakout box and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in FP circuit.
22. 34) Check FP Circuit In FPDM Reconnect FPDM. Turn ignition on. Measure voltage between test pins No. 51 (PWR GND) and 80 at breakout box. If voltage is 4.5-5.5 volts, replace PCM. If voltage is not 4.5-5.5 volts, replace FPDM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 34) to step 40). No test procedures have been omitted.
23. 40) Check For Intermittent Short Or Open Circuit Turn ignition on. using scan tool, select FP M PID. Observe FP M PID value for indication of fault while lightly tapping on FPDM to simulate road shock. Fault will be indicated if FP M PID value changes from 50 percent. Wiggle and bend FP circuit between FPDM and PCM. If any faults are found, isolate fault and repair as necessary. If no faults are found, problem cannot be duplicated at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 40) to step 47). No test procedures have been omitted.
24. 47) DTC P1237 Or P1238 These DTCs indicate FPDM has detected a fuel pump secondary circuit fault. This is due to an intermittent or hard fault. If DTC P1237 or P1238 is present in «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) or KOER ON-DEMAND SELF-TEST, DTC is a hard fault. Go to next step. If DTC P1237 or P1238 is not present in KOEO or KOER ON-DEMAND SELF-TEST, fault is intermittent. Go to step 57).
25. 48) Check If Engine Starts Attempt to start engine. If engine starts, go to step 62). If engine does not start, go to next step.
26. 49) Check Circuit Resistance Turn ignition off. Disconnect scan tool. Disconnect FPDM connector. Measure resistance between FP PWR terminal and FUEL PUMP GROUND terminal at FPDM wiring harness connector. If resistance is 10 ohms or more, go to step 54). If resistance is less than 10 ohms, go to next step.
27. 50) Check Ground Circuit For Short To Power Turn ignition on. Measure voltage between chassis ground and FUEL PUMP GROUND terminal at FPDM wiring harness connector. If voltage is one volt or more, repair short to power. If voltage is less than one volt, go to next step.
28. 51) Check FP PWR Circuit For Short To Ground Turn ignition off. Disconnect fuel pump connector. Measure resistance between negative battery terminal and FP PWR terminal at FPDM wiring harness connector. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in FP PWR circuit.
29. 52) Check For Power To Fuel Pump Reconnect FPDM and scan tool. Turn ignition on. Connect DVOM between FP PWR terminal and FUEL PUMP GROUND terminal at fuel pump wiring harness connector. Using scan tool, access OUTPUT TEST MODE. Command fuel pump on. Fuel pump will turn on for about 5 seconds. With fuel pump commanded on, if voltage is more than 10 volts, replace fuel pump. If voltage is 10 volts or less, verify battery is full charged. Ensure fuel pump on command did not time-out before voltage check was made. If battery is okay and on command did not time-out, replace FPDM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 54). No test procedures have been omitted.
30. 54) Isolate Open Circuit Turn ignition off. Disconnect fuel pump. Measure resistance of FP PWR circuit between fuel pump wiring harness connector and FPDM wiring harness connector. Measure resistance of FUEL PUMP GROUND circuit between fuel pump wiring harness connector and FPDM wiring harness connector. Also, measure internal resistance of fuel pump. If all resistance readings are less than 10 ohms, no faults are present. Verify results of previous steps. If any resistance reading is 10 ohms or more, repair open in appropriate circuit or replace fuel pump. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 54) to step 57). No test procedures have been omitted.
31. 57) Check Fuel Pump Secondary Circuit Turn ignition on. Using scan tool, select FP M PID. Observe FP M PID value for indication of fault while lightly tapping on FPDM to simulate road shock. Fault will be indicated if FP M PID value changes from 50 percent. Wiggle and bend FP PWR circuit and FUEL PUMP GROUND circuit between FPDM and fuel pump. Lightly tap on fuel pump and FPDM to simulate road shock. If any faults are found, isolate fault and repair as necessary. If no faults are found, go to next step.
32. 58) Check FP PWR Circuit For Short To Ground Turn ignition off. Disconnect FPDM. Connect a test light between FP PWR terminal and FPDM PWR terminal at FPDM wiring harness connector. Turn ignition on. Observe test light for indication of fault while wiggling and bending FP PWR circuit between FPDM and fuel pump. If a fault is indicated, test light will turn on. If any faults are found, isolate fault and repair as necessary. If no faults are found, unable to duplicate or identify fault at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 58) to step 61). No test procedures have been omitted.
33. 61) Check Voltage To FPDM With Ignition Off Turn ignition off. Disconnect FPDM connector. Measure voltage between FPDM PWR terminal at FPDM wiring harness connector and chassis ground. If voltage is 2 volts or less, go to next step. If voltage is more than 2 volts, go to step 65).
34. 62) Check FPDM Leave FPDM disconnected. Turn ignition on. Listen for fuel pump operation. If fuel pump operates, repair short to power in FP PWR circuit. If fuel pump does not operate, replace FPDM. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 62) to step 65). No test procedures have been omitted.
35. 65) Check Voltage To FPDM Turn ignition off. Disconnect FPDM power supply relay. Measure voltage between FPDM PWR terminal at FPDM wiring harness connector and chassis ground. If voltage is 2 volts or less, replace FPDM power supply relay. If voltage is more than 2 volts, repair short to power in FPDM PWR circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 65) to step 70). No test procedures have been omitted.
36. 70) Check Battery Voltage With Outputs Commanded On Turn ignition off. Disconnect fuel pump connector. Connect scan tool to DLC. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Connect a DVOM between battery terminals. While monitoring battery voltage, command all outputs ON. If battery voltage is more than 11 volts, command all outputs OFF and go to next step. If battery voltage is 11 volts or less, service battery/charging system as necessary.
37. 71) Check Ground Circuit To Fuel Pump Turn ignition off. Connect DVOM between FP PWR terminal at fuel pump wiring harness connector and negative battery terminal. Using scan tool, command all outputs on. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, locate and repair fault in ground circuit to fuel pump.
38. 72) Check Voltage To FPDM Turn ignition off. Disconnect FPDM connector. Turn ignition on. Measure voltage between negative battery terminal and VPWR terminal at FPDM wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts, or less, go to next step.
39. 73) Check FP PWR Circuit Turn ignition off. Connect a jumper wire between VPWR terminal and FP PWR terminal at FPDM wiring harness connector. Turn ignition on. Measure voltage between FP PWR terminal at fuel pump wiring harness and negative battery terminal. If voltage is more than 10.5 volts, and is within .5 volt of voltage measured in step 72), replace FPDM. If voltage is not as specified, isolate high resistance in FP PWR circuit and repair as necessary. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 73) to step 75). No test procedures have been omitted.
40. 75) Check For B+ Turn ignition off. Disconnect EEC-V power relay. Relay is located in power distribution box in left front of engine compartment. Turn ignition on. Measure voltage between B+ terminal at EEC-V power relay wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check for incorrect voltage supply to EEC-V power relay and repair as necessary.
41. 76) Check FPDM PWR Circuit Turn ignition off. Connect a jumper wire between B+ terminal and VPWR terminal at EEC-V power relay harness connector. Turn ignition on. Measure voltage between negative battery terminal and VPWR terminal at FPDM wiring harness connector. If voltage is more than 10.5 volts, replace FPDM. If voltage is 10.5 volts or less, isolate for high resistance in system circuits and repair as necessary.

CIRCUIT TEST KE - IDLE AIR CONTROL (IAC) VALVE

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Throttle linkage.
2. Wiring harness circuits (IAC and VPWR).
3. Faulty Idle Air Control (IAC) valve.
4. Faulty throttle body.
5. Faulty Powertrain Control Module (PCM).

Scheme 50

1. 1) Check For DTCs Retrieve and record all Continuous Memory DTCs. Perform «KOER ON-DEMAND SELF-TEST»(ref-131243-S21378199322001123100000). If DTC P0505, P1504 or P1507 is present, go to next step. If DTC P0505 or P1507 is not present, IAC system is okay and testing is complete. If symptom exists, go to TESTS W/O CODES - EEC-V article.
2. 2) DTC P0505, P1504 & P1507 DTCs P0505 and P1504 indicate IAC system malfunction has been detected. DTC P1507 indicates that IAC system under speed fault has been detected. Possible causes are: IAC circuit open or shorted to PWR. VPWR circuit open. Contaminated IAC valve assembly. Damaged throttle body. Faulty IAC valve. Faulty PCM. Turn ignition off. Disconnect IAC valve connector. Turn ignition on. Measure voltage between VPWR terminal at IAC valve wiring harness connector and battery ground terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit.
3. 3) Check IAC Valve Resistance Turn ignition off. Connect DVOM positive lead to VPWR terminal at IAC valve. Connect DVOM negative lead to IAC terminal at IAC valve. If resistance is 6-13 ohms, go to next step. If resistance is not 6-13 ohms, replace IAC valve assembly.
4. 4) Check IAC Valve Internal Short To Case Turn ignition off. Measure resistance between each IAC valve terminal and IAC housing. If both resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, replace IAC valve assembly.
5. 5) Check Air Inlet System Turn ignition off. Remove air filter. Inspect air filter, MAF sensor and air inlet system for excessive dirt or contamination. Repair as necessary. If air inlet system is okay, go to next step.
6. 6) Check For Vacuum Leaks Start engine and allow to idle. Inspect air inlet system any of the following possible faults: Cracked or punctured air inlet tube. Loose inlet air tube or air cleaner housing. Loose or damaged throttle body. Contaminated or damaged IAC valve assembly. Faulty EGR valve or gasket Faulty PCV valve or hose. Check entire system for vacuum leaks. Repair as necessary. If no vacuum leaks are found, go to next step.
7. 7) Check IAC Circuit Continuity Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between breakout box test pin No. 83 (IAC) and IAC terminal at IAC valve wiring harness connector. If resistance is 5 ohms or more, repair open in IAC circuit. If resistance is less than 5 ohms, go to next step.
8. 8) Check IAC Circuit For Short To Power Turn ignition on. Measure voltage between test pin No. 83 (IAC) at breakout box and chassis ground. If voltage is one volt or more, repair short to power in IAC circuit. If voltage is less than one volt, go to next step.
9. 9) Check IAC Circuit For Short To Ground Turn ignition off. Disconnect scan tool from DLC. Measure resistance between test pin No. 83 (IAC) and test pins No. 51 and 103 (PWR GND) at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in IAC circuit.
10. 10) Check IAC Signal From PCM Connect PCM to breakout box. Connect IAC valve to wiring harness connector. Connect DVOM between test pins No. 83 (IAC) and No. 51 (PWR GND) at breakout box. Start engine and slowly increase speed to 3000 RPM. If voltage is not 3.0-11.5, replace PCM. If voltage is 3.0-11.5 volts, proceed as follows: If Continuous Memory DTC P1504 or P1507 is present, go to step 30). If Continuous Memory DTC P1504 or P1507 is not present, check throttle body for damage. Repair as necessary. If throttle body is okay, replace IAC valve. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 20). No test procedures have been omitted.
11. 20) DTC P1506 This DTC indicates IAC system has reached over speed malfunction. Possible causes are: IAC circuit short to ground. IAC assembly stuck open. Air intake leaks or restrictions. Damaged throttle body. Contaminated or damaged IAC valve assembly. Faulty Powertrain Control Module (PCM). Start engine and allow to idle. Inspect air inlet system any of the following possible faults: Cracked or punctured air inlet tube. Loose inlet air tube or air cleaner housing. Loose or damaged throttle body. Contaminated or damaged IAC valve assembly. Faulty EGR valve or gasket. Faulty PCV valve or hose. Check entire system for vacuum leaks. Repair as necessary. If no vacuum leaks are found, go to next step.
12. 21) Check EVAP System Turn ignition off. Disconnect hoses from EVAP canister purge valve. Connect a vacuum pump to carbon canister hose port. (Scheme 50) Using vacuum pump, apply 16 in. Hg to port. If vacuum bleeds off within 20 seconds, replace EVAP canister purge valve. If vacuum holds, go to next step. (Scheme 50): Identifying EVAP Canister Purge Hose Ports
13. 22) Check IAC Valve Function Start engine and allow to idle. Ensure transmission is in Park or Neutral and engine is warmed to normal operating temperature. Disconnect IAC valve wiring harness connector. If engine speed drops, go to next step. If engine speed does not drop, check throttle body for damage. If throttle body is okay, replace IAC valve.
14. 23) Check IAC Circuit For Short To Ground Turn ignition off. Disconnect scan tool from DLC. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 83 (IAC) and test pins No. 51 and 103 (PWR GND) at breakout box. If both resistance readings are more than 10,000 ohms and idle speed is normal, go to step 30). If both resistance readings are more than 10,000 ohms and high idle speed is present, replace PCM. If resistance is 10,000 ohms or less, repair short to ground in IAC circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 23) to step 25). No test procedures have been omitted.
15. 25) DTC P1505: Check Inlet Air Supply This DTC indicates IAC system has reached the adaptive learning limit. Possible causes are: Air intake leaks or restrictions. Throttle body linkage binding. Contaminated or damaged IAC valve assembly. Damaged throttle body. Inspect air intake system for leaks. Repair as necessary. If air intake system is okay, go to next step.
16. 26) Check Air Inlet System Turn ignition off. Remove air filter. Inspect air filter, MAF sensor and air inlet system for excessive dirt or contamination. Repair as necessary. If air intake system is okay, go to next step.
17. 27) Check Throttle Body & Linkage Disconnect accelerator cable. Remove air cleaner tube from throttle body. Check cable and throttle body linkage for binding or interference. If faults are present, go to «CIRCUIT TEST HU»(ref-131243-S15468956572001123100000), step 3). If no faults are present, go to CIRCUIT TEST HU, step 8). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 27) to step 30). No test procedures have been omitted.
18. 30) Check IAC System For Intermittent Open Or Short Circuit Connect scan tool to DLC. Start engine and allow to idle. Ensure all accessories are off and engine is warmed to normal operating temperature. Using scan tool, select IAC and RPM PIDs from PID/DATA monitor menu. IAC duty cycle should be 20-45 percent. Observe IAC and RPM PIDs for indication of fault while performing the following: Wiggle and bend wiring harness starting at IAC valve and work toward PCM. Lightly tap on IAC valve to simulate road shock. Fault will be indicated by sudden change in IAC PID or RPM PID value. If any faults are found, isolate fault and repair as necessary. If no faults are found, problem cannot be duplicated at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000).

CIRCUIT TEST KF - FAN CONTROL (FC) RELAY

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

PCM determines engine cooling fan requirements and controls fan operation through Low Fan Control (LFC) and High Fan Control (HFC) circuits. HFC relay is normally open.

Perform this test only when instructed by QUICK TEST or directed by other test procedures. This test is only intended to diagnose

Scheme 51

1. Wiring harness circuits (LFC, HFC, B+, FAN PWR and VPWR).
2. Low Fan Control (LFC) relay and High Fan Control (HFC) relay.
3. Powertrain Control Module (PCM). NOTE: During diagnosis, use CIRCUIT PIN IDENTIFICATION table to determine correct breakout box test pin, circuit and relay being tested. CIRCUIT PIN IDENTIFICATION DTC Circuit/Relay Breakout Box Pin No. P1474 LFC 28 P1479 HFC 46

1. 1) DTC P1474 & P1479: Check For VPWR To Applicable Fan Control Relay DTC P1474 indicates a Low Speed Fan Control (LFC) primary circuit failure. DTC P1479 indicates a High Speed Fan Control (HFC) primary circuit failure. Possible causes are: Open or shorted LFC or HFC circuit. Open VPWR circuit to fan control relay. Faulty fan control relay (LFC or HFC). Faulty PCM. Turn ignition off. Disconnect appropriate fan control relay. Turn ignition on. Using a voltmeter, measure voltage between VPWR terminal at appropriate fan control relay wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit to appropriate fan control relay.
2. 2) Check For LFC Or HFC Circuit Cycling Turn ignition on, engine off. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) in ADDITIONAL SYSTEM FUNCTIONS. Connect a test light between VPWR terminal and LFC or HFC terminal at appropriate fan control relay wiring harness connector. Using scan tool, command appropriate cooling fan speed on and off. If test light turns on and off, replace appropriate fan control relay. If test light does not turn on and off, turn ignition off, remove test light and go to next step.
3. 3) Check LFC Or HFC Circuit For Short To Power Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition on, engine off. Measure voltage between ground and LFC or HFC terminal at appropriate fan control relay wiring harness connector. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair LFC or HFC circuit for short to power.
4. 4) Check LFC Or HFC Circuit For Short To Ground Turn ignition off. Disconnect scan tool. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between ground and appropriate test pin (LFC or HFC) at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair LFC or HFC circuit short to ground.
5. 5) Check For Open LFC Or HFC Circuit Measure resistance between appropriate test pin (LFC or HFC) at breakout box and LFC or HFC terminal at appropriate fan control relay wiring harness connector. If resistance is less than 5 ohms, replace PCM. If resistance 5 ohms or more, repair open in LFC or HFC circuit. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 10). No test procedures have been omitted.
6. 10) Continuous Memory DTC P1474 Continuous Memory DTC P1474 indicates an LFC circuit failure occurred during vehicle operation. Possible causes are: Open VPWR circuit to LFC relay. Open or shorted LFC circuit. Turn ignition off. Ensure A/C and defroster are off. Disconnect cooling fan motor connector (both fan motor connectors on models with 2 fans). Inspect connector(s) for loose, damaged or corroded terminals. Repair as necessary. Connect a test light between ground and power-to-low fan terminal at fan motor wiring harness connector (either connector on models with 2 fans). Turn ignition on, engine off. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) in ADDITIONAL SYSTEM FUNCTIONS. Command low speed fan ON. Test light should be on. Observe test light for indication of fault (test light will turn off to indicate fault) while performing the following: Shake and bend LFC circuit between PCM and LFC relay. Shake and bend VPWR circuit to LFC relay. Lightly tap on LFC relay to simulate road shock. If fault is indicated, turn ignition off. Isolate and repair open or short to power in wiring harness. If fault is not indicated, go to next step.
7. 11) Check LFC Circuit For Short To Ground Turn ignition on, engine off. Ensure cooling fan motor connector(s) are disconnected and test light is still connected. Using scan tool, command low speed fan OFF. Test light should be off. Observe test light for indication of fault (test light will turn on to indicate fault) while performing the following: Shake and bend LFC circuit between PCM and LFC relay. Lightly tap on LFC relay to simulate road shock. If fault is indicated, isolate and repair short to ground in wiring harness. If fault is not indicated, problem is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 11) to step 20). No test procedures have been omitted.
8. 20) Continuous Memory DTC P1479 Continuous Memory DTC P1479 indicates an HFC circuit failure has occurred during vehicle operation. Possible causes are: Open VPWR circuit to HFC relay. Open or shorted HFC circuit. Turn ignition off. Ensure A/C and defroster are off. Disconnect cooling fan motor connector (both fan motor connectors on models with 2 fans). Inspect connector(s) for loose, damaged or corroded terminals. Repair as necessary. Connect a test light between ground and power-to-high speed fan terminal at fan motor wiring harness connector (either connector on models with 2 fans). Turn ignition on, engine off. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) in ADDITIONAL SYSTEM FUNCTIONS. Command high speed fan on. Test light should be on. Observe test light for indication of fault (test light will turn off to indicate fault) while performing the following: Shake and bend HFC circuit between PCM and HFC relay. Shake and bend VPWR circuit to HFC relay. Lightly tap on HFC relay to simulate road shock. If fault is indicated, turn ignition off. Isolate and repair open or short to power in wiring harness. If fault is not indicated, go to next step.
9. 21) Check HFC Circuit For Short To Ground Turn ignition on, engine off. Ensure cooling fan motor connector(s) are disconnected and test light is still installed. Using scan tool, command high speed fan OFF. Test light should be off. Observe test light for indication of fault (test light will turn on to indicate fault) while performing the following: Shake and bend HFC circuit between PCM and HFC relay. Lightly tap on HFC fan control relay to simulate road shock. If fault is indicated, turn ignition off. Isolate and repair short to ground in wiring harness. If fault is not indicated, problem is intermittent. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000) . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 21) to step 31). No test procedures have been omitted.
10. 31) Cooling Fan Will Not Operate At Any Speed Ensure ignition is on, scan tool is still connected and in «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) , and cooling fan is commanded off. Disconnect cooling fan motor connector. Using scan tool, command high speed cooling fan ON. Using a voltmeter, measure voltage between ground and High Fan PWR terminal at fan motor wiring harness connector. If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, go to step 35).
11. 32) Check B + Circuit To HFC & LFC Relays Turn ignition off. Ensure cooling fan motor connector(s) are disconnected. Disconnect HFC and LFC relays. Measure voltage between ground and B + terminal at HFC and LFC relay wiring harness connectors. If both voltage readings are more than 10.5 volts, go to next step. If any voltage reading is 10.5 volts or less, check for faulty B + circuit (open circuit or blown fuse). If a fuse is blown, check for short to ground before replacing fuse. Repair as necessary. Recheck cooling fan operation.
12. 33) Check For Open Circuit Measure resistance of High Fan PWR circuit between HFC relay wiring harness connector and cooling fan motor wiring harness connector(s). Also, measure resistance of Low Fan PWR circuit between LFC relay wiring harness connector and cooling fan wiring harness connector(s). If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, locate and repair open circuit. Recheck cooling fan operation.
13. 34) Check Power To Cooling Fan Motor Reconnect HFC and LFC relays. Ensure cooling fan motor connector(s) are disconnected. Turn ignition on, engine off. Using scan tool, access «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) . Command low speed fan on. Measure voltage between ground and Low Fan PWR terminal at cooling fan motor wiring harness connector. If voltage is more than 10 volts, replace HFC relay and go to next step. If voltage is 10 volts or less, go to step 75) and follow procedure for low speed fan inoperative. After repair, repeat step 75) and follow procedure for high speed fan inoperative.
14. 35) Check Cooling Fan Ground Circuit Turn ignition off. Disconnect scan tool. Measure resistance between ground and ground terminal at cooling fan motor wiring harness connector. If resistance is less than 5 ohms, replace cooling fan motor(s). If resistance is 5 ohms or more, locate and repair open in ground circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 35) to step 40). No test procedures have been omitted.
15. 40) Determine Which Fan Speed Is Operational If high speed fan was inoperative in step 30), go to step 46). If low speed fan was inoperative in step 30), go to next step.
16. 41) Low Speed Fan Inoperative Turn ignition on, engine off. Ensure scan tool is still in «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) with fan commanded off. Disconnect cooling fan motor connector. Using scan tool, command low speed fan ON. Measure voltage between ground and Low Fan PWR terminal at cooling fan motor wiring harness connector. If voltage is more than 10 volts, verify ground circuit to cooling fan motor. If ground is okay, replace fan motor and recheck cooling fan operation. If voltage is 10 volts or less, go to next step.
17. 42) Check Voltage To LFC Relay Disconnect LFC relay. Measure voltage between ground and B+ terminal at LFC relay wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check for faulty B+ circuit (open circuit or blown fuse). If a fuse is blown, check for short to ground before replacing fuse. Repair as necessary. Recheck cooling fan operation.
18. 43) Check For Open Circuit Measure resistance of Low Fan PWR circuit between LFC relay wiring harness connector and cooling fan motor wiring harness connector(s). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open in Low Fan PWR circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 43) to step 46). No test procedures have been omitted.
19. 46) High Speed Fan Inoperative Ensure scan tool is connected and still in OUTPUT TEST MODE with fan commanded off. Disconnect cooling fan motor connector. Turn ignition on, engine off. Using scan tool, command high speed fan ON. Measure voltage between ground and High Fan PWR terminal at cooling fan motor wiring harness connector. If voltage is more than 10 volts, verify ground circuit to cooling fan motor. If ground is okay, replace fan motor and recheck cooling fan operation. If voltage is 10 volts or less, go to next step.
20. 47) Check For B+ To HFC Relay Disconnect HFC relay. Measure voltage between ground and B + terminal at HFC relay wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, locate cause of no B+ to HFC relay (blown fuse or open circuit). If fuse is blown, check for short circuit before replacing fuse. Repair as necessary. Recheck cooling fan operation.
21. 48) Check For Open High Fan PWR Circuit Turn ignition off. Measure resistance of High Fan PWR circuit between HFC relay wiring harness connector and cooling fan motor wiring harness connector. If resistance is less than 5 ohms, go to step 75). If resistance is 5 ohms or more, repair open in High Fan PWR circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 48) to step 50). No test procedures have been omitted.
22. 50) Low Speed &/Or High Speed Cooling Fan Inoperative If one cooling fan is inoperative, but other cooling fan operates normally, go to step 70). Turn ignition off. Disconnect LFC and HFC relays. Measure voltage between ground and B+ terminal at both LFC and HFC relay wiring harness connectors. If both voltage readings are more than 10.5 volts, go to next step. If any voltage reading is 10.5 volts or less, locate and repair open in B+ circuit. If fuse or fuse link was blown, check and repair cause of blown fuse or fuse link. Recheck cooling fan operation.
23. 51) Check Fan PWR Circuit, Fan Ground & Internal Fan Circuits Ensure ignition is off. Measure resistance between ground and Fan PWR terminal at both LFC and HFC relay wiring harness connectors. If both resistance readings are less than 15 ohms, go to next step. If any resistance reading is 15 ohms or more, go to step 56).
24. 52) Check For Short To Ground In Fan PWR Circuit Disconnect both cooling fan motors. Measure resistance between ground and Fan PWR terminal at HFC relay wiring harness connector. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, locate and repair short to ground in Fan PWR circuit. Recheck cooling fan operation.
25. 53) Check HFC & LFC Relay Operation Ensure cooling fan motor connectors are disconnected. Reconnect HFC and LFC relays. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) in ADDITIONAL SYSTEM FUNCTIONS. Check relays as follows: HFC Relay Turn ignition on, engine off. Using scan tool, command high speed fan ON. Wait 15 seconds. Using a voltmeter, measure voltage between ground and Fan PWR terminal at cooling fan motor wiring harness connector (either fan motor). Voltage should be more than 10.5 volts. LFC Relay Turn ignition on, engine off. Using scan tool, command low speed fan ON. Using a voltmeter, measure voltage between ground and Fan PWR terminal at cooling fan motor wiring harness connector (either fan motor). Voltage should be more than 10 volts. If both voltage readings are as specified, replace cooling fan motor(s). If any voltage reading is not as specified, note which fan speed is inoperative and go to step 75). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 53) to step 56). No test procedures have been omitted.
26. 56) Check Fan PWR Circuit Resistance Turn ignition off. Disconnect cooling fan motor (either one). Measure resistance of Fan PWR circuit between cooling fan motor wiring harness connector and both HFC and LFC relay wiring harness connectors. If both resistance readings are less than 15 ohms, go to next step. If any resistance reading is 15 ohms or more, locate and repair open in Fan PWR circuit. Recheck cooling fan operation.
27. 57) Check Cooling Fan Ground Circuit Measure resistance between ground and ground terminal at cooling fan motor wiring harness connector. If resistance is less than 5 ohms, replace inoperative cooling fan motor(s). If resistance is 5 ohms or more, locate and repair open in ground circuit. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 57) to step 65). No test procedures have been omitted.
28. 65) Low &/Or High Speed Cooling Fan Always Runs Ensure A/C Pressure Switch (ACPSW) is okay before proceeding with this test step. Turn A/C and defroster off. Turn ignition off. Disconnect LFC relay. Turn ignition on. If cooling fan continues to run, go to next step. If cooling fan stops, go to step 80).
29. 66) Check HFC Relay Turn ignition off. Disconnect HFC and LFC relays. Turn ignition on. Check cooling fan operation. If cooling fan stops, go to step 80). If cooling fan remains on, turn ignition off. Repair Fan PWR circuit for short to power. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 68) to step 70). No test procedures have been omitted.
30. 70) One Cooling Fan Inoperative & Other Cooling Fan Operates Normally (With No DTCs Set) Turn ignition off. Disconnect inoperative cooling fan motor connector. Measure resistance between ground and ground terminal at fan motor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit. Recheck cooling fan operation.
31. 71) Check For Voltage To Fan Disconnect remaining cooling fan motor. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) in ADDITIONAL SYSTEM FUNCTIONS. Command high speed fan on. Measure voltage between ground and High Fan PWR terminal at inoperative cooling fan motor wiring harness connector. If voltage is more than 10 volts, replace inoperative cooling fan motor. Recheck cooling fan operation. If voltage is 10 volts or less, locate and repair open circuit between inoperative cooling fan motor and splice to other fan motor. Recheck fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 71) to step 75). No test procedures have been omitted.
32. 75) Accessing Parameter Identification (PID) A inoperative high speed of low speed fan can be caused by a primary circuit fault, even though a DTC was not set. Check if scan tool being used is capable of accessing PID values while in Output Test Mode. If PID access is possible, go to next step. If PID access is not possible, go to step 78) (if low speed fan inoperative) or step 79) (if high speed fan inoperative).
33. 76) Check Operation Of Primary Fan Circuits Reconnect all connectors. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) in ADDITIONAL SYSTEM FUNCTIONS. Perform the appropriate test procedure as follows: Low Speed Fan Inoperative Using scan tool, select LFCA and LFCF PIDs from PID/DATA monitor menu. With low speed fan off, LFCA PID should read OFF and LFCF PID should read NO. Command low speed fan on. LFCA PID should read ON and LFCF PID should still be NO. High Speed Fan Inoperative Using scan tool, select HFCA and HFCF PIDs from PID/DATA monitor menu. Command high speed fan on. HFCA PID should read OFF and LFCF PID should read NO. Command high speed fan on. HFCA PID should read ON and HFCF PID should still be NO. If LFCF PID of HFCF PID indicated YES with fan commanded on or off, a primary circuit fault is detected. Go to step 1) and perform diagnosis for DTC P1479 (if HFCF PID was yes) or perform diagnosis for DTC P1474 (if LFCF PID was yes). If LFCF PID of HFCF PID indicated NO with fan commanded on or off, primary circuits are okay. Replace LFC relay (if low speed fan is inoperative) or replace HFC relay (if high speed fan is inoperative). Verify applicable Fan PWR circuit is not shorted to ground. Recheck cooling fan operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 76) to step 78). No test procedures have been omitted.
34. 78) Check Operation Of Low Speed Fan Primary Circuits Reconnect all connectors. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-000950). Connect PCM to breakout box. Turn ignition on. Measure voltage between test pins No. 77 and 28. Note voltage reading. Using scan tool, access OUTPUT TEST MODE. Command low speed fan on. Again, measure voltage between test pins No. 77 and 28. If voltage change was more than 6 volts when low speed fan was commanded ON, primary circuits are okay. Replace LFC relay. Verify applicable Fan PWR circuit is not shorted to ground. Recheck cooling fan operation. If voltage change was not more than 6 volts when speed fan was commanded ON, LFC primary circuit fault is detected. Go to step 1) and perform diagnosis for DTC P1474.
35. 79) Check Operation Of High Speed Fan Primary Circuits Reconnect all connectors. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-000950). Connect PCM to breakout box. Turn ignition on. Measure voltage between test pins No. 77 and 46. Note voltage reading. Using scan tool, access OUTPUT TEST MODE. Command high speed fan on. Again, measure voltage between test pins No. 77 and 46. If voltage change was more than 6 volts when high speed fan was commanded ON, primary circuits are okay. Replace HFC relay. Verify applicable Fan PWR circuit is not shorted to ground. Recheck cooling fan operation. If voltage change was not more than 6 volts when high speed fan was commanded ON, HFC primary circuit fault is detected. Go to step 1) and perform diagnosis for DTC P1479.
36. 80) Check Operation Of Primary Fan Circuits Reconnect LFC or HFC relay connector. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. See «OUTPUT TEST MODE»(ref-131243-S21043523042001123100000) in ADDITIONAL SYSTEM FUNCTIONS. Perform the appropriate test procedure as follows: Fan Stops Running With LFC Relay Disconnected Using scan tool, select LFCA and LFCF PIDs from PID/DATA monitor menu. Command low speed off. LFCA PID should read OFF and LFCF PID should read NO. Fan Stops Running With HFC Relay Disconnected Using scan tool, select HFCA and HFCF PIDs from PID/DATA monitor menu. Command high speed fan off. HFCA PID should read OFF and HFCF PID should read NO. If LFCF PID of HFCF PID indicated YES with fan commanded OFF, a primary circuit fault is detected. Go to step 1) and perform diagnosis for DTC P1479 (if HFCF PID was yes) or perform diagnosis for DTC P1474 (if LFCF PID was yes). If LFCF PID of HFCF PID indicated NO with fan commanded OFF, primary circuits are okay. Replace LFC relay (if fan stopped running with LFC relay disconnected) or replace HFC relay (if fan stopped running with HFC relay disconnected). Recheck cooling fan operation.

CIRCUIT TEST KM - WOT A/C CUT-OFF (WAC)

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuits (ACCS, ACPSW, VPWR and WAC).
2. Faulty WOT A/C cutoff relay.
3. Faulty Powertrain Control Module (PCM).

Scheme 52

1. 1) KOEO & KOER DTC P1460: Verify ACCS PID Is Off These DTCs indicate a WAC circuit fault or A/C was on during self-test. Possible causes are: A/C on during self-test. Open or shorted circuit. Faulty WOT A/C cutoff relay. Faulty PCM. Ensure A/C and defroster were off during «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) and KOER ON-DEMAND SELF-TEST. If vehicle is not equipped with A/C, ignore P1460. If A/C or defroster was on during self-test, turn system off and repeat self-test. If vehicle is equipped with A/C, start engine and allow to idle. Using scan tool, select ACCS PID. If PID value indicates OFF, go to next step. If PID value indicates ON, go to step 20).
2. 2) Check VPWR Circuit Turn ignition off. Disconnect WOT A/C cutoff relay connector. Turn ignition on. Measure voltage between VPWR terminal at WOT A/C cutoff relay wiring harness connector and chassis ground. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000). NOTE: To identify FSV relay terminals, refer to numbers molded on relay.
3. 3) Check WOT A/C Cutoff Relay Turn ignition off. Measure resistance between terminal No. 1 or No. 85 and all other relay terminals. Resistance should be either 40-120 ohms, or more than 10,000 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace WOT A/C cutoff relay. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000).
4. 4) Check WOT A/C Cutoff (WAC) Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 69 (WAC) at breakout box and chassis ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in WAC circuit. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000).
5. 5) Check WAC Circuit For Short To Ground Turn ignition off. Disconnect scan tool. Measure resistance between test pin No. 69 (WAC) at breakout box and chassis ground. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in WAC circuit. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000).
6. 6) Check For Open WAC Circuit Measure resistance between test pin No. 69 at breakout box and WAC terminal at WOT A/C cutoff relay wiring harness connector. If resistance is less than 5 ohms, replace PCM. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000). If resistance is 5 ohms or more, repair open in WAC circuit. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.
7. 10) Check For Voltage To A/C Cycling Switch Turn ignition on. Disconnect A/C cycling switch. Turn A/C switch on. Measure voltage between A/C Demand Switch input terminal at A/C cycling switch wiring harness connector and chassis ground. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check for fault in A/C demand switch, related fuses or related wiring harness. See AIR CONDITIONING & HEATING SERVICE & REPAIR article.
8. 11) Check A/C Cycling Switch Contacts Turn ignition off. Measure resistance between A/C cycling switch terminals. If resistance is less than 5 ohms, reconnect A/C cycling switch and go to next step. If resistance is 5 ohms or more, check for low refrigerant charge.
9. 12) Check For Voltage To A/C High Pressure Switch Disconnect A/C high pressure switch connector. Turn ignition and A/C switch on. Measure voltage between chassis ground and A/C Demand Switch input terminal at A/C high pressure switch wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check for open circuit between A/C cycling switch and A/C high pressure switch. Repair as necessary and verify symptom no longer exists.
10. 13) Check Continuity Of A/C High Pressure Switch Contacts Turn ignition off. Measure resistance of high pressure contacts at A/C high pressure switch. If resistance is less than 5 ohms, reconnect A/C high pressure switch and go to next step. If resistance is 5 ohms or more, check for high pressure (refrigerant overcharge). Service A/C system as necessary. If A/C system pressure is okay, replace A/C high pressure switch. Verify symptom no longer exists.
11. 14) Check Voltage To PCM Ensure ignition is off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Turn A/C on. Measure voltage between test pin No. 41 (ACCS) at breakout box and chassis ground. If voltage is 10.5 volts or less, repair open circuit between A/C high pressure switch and PCM. If voltage is more than 10.5 volts, replace PCM and verify symptom no longer exists.
12. 15) Check A/C Demand Switch Voltage Turn ignition off. Disconnect WOT A/C cutoff relay. Turn ignition on. Turn A/C on. Measure voltage at A/C Demand Switch input terminal at WOT A/C cutoff relay wiring harness connector. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in A/C demand circuit between WOT A/C cutoff relay and ACCS circuit splice to PCM. Verify symptom no longer exists.
13. 16) Check A/C Clutch PWR & A/C Clutch Ground Circuits Disconnect A/C clutch. Disconnect scan tool. Measure resistance of A/C clutch PWR circuit between WOT A/C cutoff relay wiring harness connector and A/C clutch wiring harness connector. Also, measure resistance of A/C clutch ground circuit between A/C clutch wiring harness connector and ground. If both resistance readings are less than 5 ohms, replace WOT A/C cutoff relay. Verify symptom no longer exists. If any resistance reading is 5 ohms or more, repair open in appropriate circuit. Verify symptom no longer exists. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 19). No test procedures have been omitted.
14. 19) DTC P1464: Check ACCS PID This DTC indicates ACCS input to PCM was high during self-test. Ensure A/C and defroster were off during «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) and KOER ON-DEMAND SELF-TEST. If A/C or defroster was on during self-test, turn system off and repeat self-test. Turn ignition on. Using scan tool, select ACCS PID. If PID value indicates ON, go to next step. If PID value indicates OFF, verify self-test results. Leave A/C and defroster off and repeat «QUICK TEST»(ref-131243-S07493578722001123100000).
15. 20) Check ACCS PID Turn ignition off. Disconnect A/C cycling switch. Turn ignition on. Using scan tool, select ACCS PID. If PID value indicates OFF, verify A/C demand switch operation. Repair as necessary. See AIR CONDITIONING & HEATING SERVICE & REPAIR article. If A/C demand switch operation is okay, repair short to power in A/C demand circuit to A/C cycling switch. If PID value indicates ON, go to next step.
16. 21) Check For Short To Power Turn ignition off. Disconnect WOT A/C cutoff relay. Turn ignition on. Measure voltage between chassis ground and A/C clutch PWR terminal at WOT A/C cutoff relay wiring harness connector. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in A/C clutch PWR circuit. Verify symptom no longer exists.
17. 22) Check ACCS Circuit For Short To Power Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 41 (ACCS) at breakout box and chassis ground. If voltage is one volt or more, repair short to power in ACCS circuit. Verify symptom no longer exists. If voltage is less than one volt, go to next step.
18. 23) Check ACCS Circuit Voltage To PCM Turn ignition off. Reconnect WOT A/C cutoff relay. Turn ignition on. Measure voltage between test pin No. 41 (ACCS) at breakout box and chassis ground. If voltage is one volt or more, replace WOT A/C cutoff relay and verify symptom no longer exists. If voltage is less than one volt, replace PCM and verify symptom no longer exists. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 23) to step 25). No test procedures have been omitted.
19. 25) Check WOT A/C Cutoff Relay Ensure A/C clutch and WOT A/C cutoff relay is connected. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Turn A/C on. While listening to A/C clutch, command outputs ON and OFF several times. If A/C clutch engages and disengages when outputs are cycled off and on, system is functioning properly. If symptom is intermittent, go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000). If A/C clutch does not operate as specified, replace WOT A/C cutoff relay. Verify symptom no longer exists. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 25) to step 30). No test procedures have been omitted.
20. 30) Continuous Memory DTC P1460 This DTC indicates WOT A/C cutoff relay circuit failure. If vehicle is not equipped with A/C, disregard this DTC. Turn ignition off. Disconnect A/C cycling switch. Connect a jumper wire between terminals of A/C cycling switch wiring harness connector. Turn ignition and A/C switch on. Check for indication of fault while performing the following: Wiggle and bend WAC circuit between WOT A/C cutoff relay and terminal No. 69 at PCM. Lightly tap on WOT A/C cutoff relay to simulate road shock. Check connectors for clean tight connection. Fault will be indicated by A/C clicking on. If any faults are found, isolate fault and repair as necessary. If no faults are found, go to next step.
21. 31) Check For Intermittent Ensure jumper wire is still connected between terminals of A/C cycling switch wiring harness connector. Using scan tool, access OUTPUT TEST MODE. Command all outputs OFF. Check for indication of fault while performing the following: Wiggle and bend WAC circuit between terminal No. 69 at PCM and WOT A/C cutoff relay. Wiggle and bend VPWR circuit to WOT A/C cutoff relay. Lightly tap on WOT A/C cutoff relay to simulate road shock. Check connectors for clean tight connection. Fault will be indicated by A/C clicking on. If any faults are found, isolate and repair as necessary. Start engine and allow to idle for 15 seconds with A/C on. Turn ignition and A/C off. Repeat «QUICK TEST»(ref-131243-S07493578722001123100000). If no faults are found, fault cannot be duplicated at this time. Go to «CIRCUIT TEST Z»(ref-131243-S22790623452001123100000). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 31) to step 35). No test procedures have been omitted.
22. 35) WOT A/C Cutoff Relay Turn ignition off. Ensure WOT A/C cutoff relay is disconnected. Measure resistance between normally closed contacts (terminals No. 3 and 4) at WOT A/C cutoff relay. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace WOT A/C cutoff relay. Verify symptom no longer exists.
23. 36) Check Voltage To WOT A/C Cutoff Relay Disconnect A/C clutch relay. Turn ignition on. Measure voltage between IGN RUN terminal at A/C clutch relay wiring harness connector and chassis ground. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check condition of related fuse. If fuse is blown, check for short to ground. Repair as necessary. If fuse is okay, repair open in IGN RUN circuit. Verify symptom no longer exists.
24. 37) Check For Open Ground Circuit Turn ignition off. Measure resistance of ground circuit between A/C clutch relay wiring harness connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit.
25. 38) Check For Open In A/C Demand Circuit Measure resistance of A/C DEMAND circuit between WOT A/C cutoff relay wiring harness connector and A/C clutch relay wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in A/C DEMAND circuit.
26. 39) Check A/C Clutch PWR & A/C Clutch Ground Circuits Disconnect A/C clutch. Disconnect scan tool. Measure resistance of A/C clutch PWR circuit between A/C clutch relay wiring harness connector and A/C clutch wiring harness connector. Also, measure resistance of A/C clutch ground circuit between A/C clutch wiring harness connector and ground. If both resistance readings are less than 5 ohms, replace A/C clutch relay. Verify symptom no longer exists. If any resistance reading is 5 ohms or more, repair open in appropriate circuit. Verify symptom no longer exists. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 39) to step 45). No test procedures have been omitted.
27. 45) Check ACCS PID Turn ignition off. Disconnect A/C high pressure switch. Disconnect A/C clutch relay. Turn ignition on. Using scan tool, select ACCS PID. If PID value indicates OFF, replace A/C clutch relay. Verify symptom no longer exists. If PID value indicates ON, go to next step.
28. 46) Check A/C Demand Circuit Turn ignition off. Disconnect WOT A/C cutoff relay. Turn ignition on. Measure voltage of A/C demand-to-A/C clutch relay circuit (Violet wire) between WOT A/C cutoff relay wiring harness connector and ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power. Verify symptom no longer exists.
29. 47) Check ACCS PID With WOT A/C Cutoff Relay Disconnected Using scan tool, select ACCS PID. If PID value indicates OFF, replace A/C clutch relay. Verify symptom no longer exists. If PID value indicates ON, go to next step.
30. 48) Check For Short To Power Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between ground and terminal No. 41 at breakout box. If voltage is less than one volt, replace PCM. Verify symptom no longer exists. If voltage is one volt or more, repair short to power in ACCS circuit. Verify symptom no longer exists. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 48) to step 50). No test procedures have been omitted.
31. 50) Check A/C Clutch Relay Turn ignition off. Disconnect A/C clutch. Disconnect A/C clutch relay. Turn ignition on. Measure voltage between A/C CLUTCH PWR terminal (Violet/Blue wire) at A/C clutch wiring harness connector and ground. If voltage is less than 2 volts, replace A/C clutch relay. If voltage is 2 volts or more, repair short to power in A/C CLUTCH PWR circuit. Verify symptom no longer exists. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 50) to step 55). No test procedures have been omitted.
32. 55) Check A/C High Pressure Switch Circuits Turn ignition off. Disconnect A/C high pressure switch. Turn A/C off. Connect a jumper wire between ACPSW terminal and ground terminal at A/C high pressure switch wiring harness connector. (Scheme 52) Start engine and wait 15 seconds. If high speed fan does not turn on, go to next step. If high speed fan turns on, no problem is indicated at this time. Reconnect all components. If A/C related symptom still exists, see AIR CONDITIONING & HEATING SERVICE & REPAIR article. (Scheme 52): Identifying A/C High Pressure Switch Wiring Harness Connector Terminals
33. 56) Check For Open Ground Circuit Start engine and allow to idle. Connect a jumper wire between ACPSW terminal at A/C high pressure switch wiring harness connector and chassis ground. Wait 15 seconds. If high speed fan is still off, remove jumper wire and go to next step. If high speed fan is on, repair open ground circuit to A/C high pressure switch. Verify symptom no longer exists.
34. 57) Check For Open ACPSW Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance of ACPSW circuit between test pin No. 86 at breakout box and A/C high pressure switch wiring harness connector. If resistance is less than 5 ohms, replace PCM. Verify symptom no longer exists. If resistance is 5 ohms or more, repair open in ACPSW circuit. Verify symptom no longer exists.

CIRCUIT TEST MB - OUTPUT TEST MODE NOT FUNCTIONING

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Connection between scan tool and PCM.
2. Connection between scan tool and battery power supply.
3. Correct key sequence executed for outputs.

1. 1) Check Scan Tool Installation Turn ignition off. Check connection between scan tool and Data Link Connector (DLC) for damage or contamination. Service as necessary. If connector is okay, go to next step.
2. 2) Check Scan Tool Power Supply Connector Check connector and wiring harness cable between scan tool and battery power supply for poor connection or damage. Repair as necessary. Perform «ON-BOARD SYSTEM READINESS (OSR) TEST MODE»(ref-131243-S37697508192001123100000) under ADDITIONAL SYSTEM FUNCTIONS to verify communication between scan tool and PCM. See scan tool manufacturer instructions, if necessary. If connector and wiring harness cable are okay, no problem with scan tool installation is indicated. Ensure correct key sequence was used to access outputs in OUTPUT TEST MODE.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Wiring harness circuit (MIL).
2. Faulty Powertrain Control Module (PCM).

MIL Circuit Schematic. Scheme 53

Note. If vehicle will not start, go to CIRCUIT TEST A .

1. 1) MIL Always On If any KOEO or Continuous Memory DTCs are present, service DTCs as necessary before continuing. If no DTCs are present, turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 2 and No. 51 or 103 (PWR GND) at breakout box. If resistance is less than 5 ohms, repair short in MIL circuit between test pin No. 2 and MIL. If resistance is 5 ohms or more, replace PCM.
2. 2) MIL Does Not Come On Turn ignition on. Measure voltage between ground side of MIL fuse and negative battery terminal. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, go to step 4).
3. 3) Check For B+ At Fuse Measure voltage between positive side of MIL fuse and negative battery terminal. If voltage is 10.5 volts or less, repair open in MIL or B+ circuit. If voltage is more than 10.5 volts, replace MIL fuse.
4. 4) Check For B+ At MIL Bulb Turn ignition off. Disconnect instrument cluster connector. Turn ignition on. Measure voltage between B+ circuit terminal at instrument cluster wiring harness connector and negative battery terminal. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in fuse, MIL bulb or B+ circuit to instrument cluster. See INSTRUMENT PANELS article in the ACCESSORIES & EQUIPMENT section.
5. 5) Check Continuity Of MIL Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 2 at breakout box and MIL terminal at instrument cluster wiring harness connector. If resistance is 5 ohms or more, repair open in MIL circuit. If resistance is less than 5 ohms, check MIL bulb and instrument cluster. See INSTRUMENT PANELS article in the ACCESSORIES & EQUIPMENT section. Repair as necessary. If no problems are found, replace PCM.

CIRCUIT TEST NC - IGNITION DIAGNOSTIC MONITOR (IDM)

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose a faulty Powertrain Control Module (PCM).

Continuous Memory DTC P0320

This DTC indicates that (2) successive erratic Profile Ignition Pulses (PIP) have occurred. Possible causes are

1. Loose wires and/or connectors.
2. Short circuit to ground in ignition secondary system.
3. Incorrect 2-way radio installation.

If any of the specified causes were present, repair as necessary. If vehicle will not start, go to CIRCUIT TEST A . If fault is intermittent, go to CIRCUIT TEST Z . If vehicle will start and none of the specified causes were present, replace PCM.

CIRCUIT TEST ND - ENGINE RPM/VEHICLE SPEED LIMITER

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures.

CIRCUIT TEST QB - DIAGNOSTIC TROUBLE CODE P0603 OR P1605

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

KAPWR is interrupted when PCM or battery is disconnected. DTC P0603 or P1605 may be generated during the next PCM power-up.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following

1. Battery terminal condition.
2. Keep Alive Power (KAPWR) circuit routing.
3. KAPWR circuit condition.
4. Faulty Powertrain Control Module (PCM).

Keep Alive Power (KAPWR) Circuit Schematic. Scheme 54

1. 1) DTC P0603 Or P1605: Check Battery Terminals Inspect battery terminals for corrosion or loose connection. Service as necessary. If battery terminals are okay, go to next step.
2. 2) Check Wiring Harness Inspect wiring harness and connectors for damage or corrosion. Ensure wiring harness is not improperly routed too close to ignition or exhaust components. Service as necessary. If no problems are found, go to next step.
3. 3) Check KAPWR Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Connect DVOM between test pin No. 55 (KAPWR) at breakout box and chassis ground. While observing DVOM, wiggle and bend small sections of wiring harness between PCM and dash panel. If voltage is continuously 10.5 volts or more, go to next step. If at anytime, voltage drops to less than 10.5 volts, isolate open in KAPWR circuit and repair as necessary.
4. 4) Check For DTC P0603 & P1605 Perform «KOEO ON-DEMAND SELF-TEST»(ref-131243-S28278812842001123100000) . If DTC P0603 or P1605 is present, replace PCM. If any other DTCs are present, service as necessary. If no DTCs are present, testing is complete. DTC P0603 or P1605 may have been due to a previous repair.

CIRCUIT TEST QC - OBD-II MONITOR TESTING NOT COMPLETE; DIAGNOSTIC TROUBLE CODE P1000

Note. After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This DTC indicates that On Board Diagnostics II (OBD-II) system self-testing has not been completed. To clear DTC P1000, a complete drive cycle, with successful OBD-II system self-test must occur.

A drive cycle consists of vehicle warmed to normal engine temperature and operated in all speed ranges. After self-test successfully completes, SYSTEM PASS can be obtained from PCM.

DTC P1000 will set in PCM memory when any of the following conditions occur

1. Vehicle is new from factory and has not yet completed an OBD-II drive cycle.
2. Battery or PCM has been disconnected.
3. An OBD-II monitor has failed before completion of OBD-II drive cycle.
4. PCM memory has been cleared with a scan tool.

DTC P1000 cannot be cleared from PCM if vehicle is equipped with Power Take Off (PTO) and circuit is shorted to power, or if PTO is on during testing.

1. 1) DTC P1000: Check For Other DTCs If any other DTCs are present, service as necessary. If no other DTCs are present, and vehicle is equipped with PTO, go to next step. If no other DTCs are present, and vehicle is not equipped with PTO, go to step 3).
2. 2) Check PTO PID Turn ignition off. Connect scan tool to Data Link Connector (DLC). Start engine and allow to idle. Using scan tool, select PTO STAT PID. Cycle PTO switch/activator on and off. If PID value does not cycle ON, DELAY and then OFF, go to «CIRCUIT TEST FB»(ref-131243-S24525434152001123100000) . If PID value cycles ON, DELAY and then OFF, PTO circuit is okay. Go to next step.
3. 3) Attempt To Clear DTC P1000 Perform OBD-II DRIVE CYCLE. See «DRIVE CYCLES»(ref-131243-S12461214872001123100000) under ADDITIONAL SYSTEM FUNCTIONS. After drive cycle is completed, repeat «QUICK TEST»(ref-131243-S07493578722001123100000) .

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This DTC indicates that anti-theft system has been activated. When activated, anti-theft system will disable fuel system. To disarm anti-theft system, use key or remote keyless entry to unlock door.

1. 1) Check For Other DTCs If any other DTCs are present, service as necessary before continuing. If no DTCs other than P1260 are present, go to next step.
2. 2) Attempt To Start Engine Use key or remote keyless entry to disarm anti-theft system. Clear PCM memory. Attempt to start engine. If engine starts, no problem is indicated at this time. Testing is complete. If engine does not start, go to next step.
3. 3) Check For DTCs Perform «QUICK TEST»(ref-131243-S07493578722001123100000) . If Continuous Memory DTC P1260 is still present, fault is in anti-theft system. See ANTI-THEFT SYSTEMS article in the ACCESSORIES & EQUIPMENT section. If Continuous Memory DTC P1260 is not present, DTC P1260 is not cause of no-start condition. See TESTS W/O CODES - EEC-V article for no-start diagnosis.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Before continuing with this circuit test, ensure that the following areas are in good condition

1. Air induction system.
2. Vacuum hoses and connections.
3. Wiring harness connectors.
4. Fuel level and quality.
5. Added aftermarket equipment.
6. Base engine (valves, timing, etc.).

Testing Typical PCM Output Control Circuit. Scheme 55

1. 1) Intermittent Test Procedure Proceed to the appropriate circuit test as follows: INPUT CIRCUIT TEST PRIORITY Circuit (1) Step 10) (2) Step 30) (3) Step 40) A/C ON 1st 3rd 2nd ACCS 1st 3rd 2nd ACD 1st 3rd 2nd ACP 1st 3rd 2nd BPP 1st N/A 2nd CASE GND 1st N/A 2nd CHT 1st 3rd 2nd CHTIL 1st N/A 2nd CHP+ (4) 1st 2nd 3rd CMP 1st 2nd 3rd CPP 1st N/A 2nd DPFEGR 1st 2nd 3rd EAIRM 1st 3rd 2nd ECT 1st 2nd 3rd ECT-A 1st 2nd 3rd ECT-B 1st 2nd 3rd FLI 1st 3rd 2nd FPM 1st N/A 2nd FRP 1st 2nd 3rd FSVM 1st N/A 2nd FTP 1st 3rd 2nd HO2S-11 1st 3rd 2nd HO2S-12 1st 3rd 2nd HO2S-21 1st 3rd 2nd HO2S-22 1st 3rd 2nd IAT 1st 2nd 3rd IMRCM 1st 3rd 2nd IMRCM-2 1st 3rd 2nd KS 1st 3rd 2nd MAF 1st 3rd 2nd OCT ADJ 1st 3rd 2nd PNP 1st N/A 2nd PSP 1st 3rd 2nd PTO 1st N/A 2nd TCS 1st N/A 2nd TP 1st 3rd 2nd VSS+ 1st 3rd 2nd (1) Input test (sensor) procedure. (2) Water soak check procedure. (3) Road test procedure. (4) Go to step 50) before performing WATER SOAK TEST. OUTPUT CIRCUIT TEST PRIORITY Circuit (1) Step 20) (2) Step 30) (3) Step 40) AIRB 1st 3rd 2nd AIRD 1st 3rd 2nd CD-1 (4) 1st 3rd 2nd CD-2 (4) 1st 3rd 2nd CD-3 (4) 1st 3rd 2nd CD-4 (4) 1st 3rd 2nd CD-5 1st N/A 2nd CD-6 1st N/A 2nd CD-7 1st N/A 2nd CD-8 1st N/A 2nd CD-9 1st N/A 2nd CD-10 1st N/A 2nd CTO 1st N/A 2nd DOL 1st N/A 2nd EAIR 1st 3rd 2nd EGRVR 1st 3rd 2nd EVAPCP 1st 3rd 2nd EVAPCV 1st 3rd 2nd EVAPPF 1st 3rd 2nd FC 1st 3rd 2nd FP 1st 3rd 2nd FSV 1st 3rd 2nd HFC 1st 3rd 2nd HTR-11 1st 3rd 2nd HTR-12 1st 3rd 2nd HTR-21 1st 3rd 2nd HTR-22 1st 3rd 2nd IAC 1st 3rd 2nd IMRC 1st 3rd 2nd IMT VALVE 1st 3rd 2nd INJ-1 1st 3rd 2nd INJ-2 1st 3rd 2nd INJ-3 1st 3rd 2nd INJ-4 1st 3rd 2nd INJ-5 1st 3rd 2nd INJ-6 1st 3rd 2nd INJ-7 1st 3rd 2nd INJ-8 1st 3rd 2nd INJ-9 1st 3rd 2nd INJ-10 1st 3rd 2nd LFC 1st 3rd 2nd LFP 1st 3rd 2nd MIL 1st N/A 2nd SIL 1st N/A 2nd TCIL 1st N/A 2nd VCT 1st 3rd 2nd WAC 1st 3rd 2nd (1) Output test procedure. (2) Water soak check procedure. (3) Road test procedure. (4) Go to step 50) before performing WATER SOAK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 1) to step 10). No test procedures have been omitted.
2. 10) Intermittent Input Test Procedure Turn ignition off. Connect scan tool to DLC. Using scan tool, select PIDs from the area of suspected wiring or component fault. Turn ignition on. If input is a switch-type component, turn switch on manually. While observing PID value, wiggle and pull on component wiring and connector. Lightly tap on component. If a fault is indicated, PID value will suddenly change. For correct PID values, see PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component. If replacement component does not repair fault, install original component and go to next step.
3. 11) Intermittent KOEO Harness Wiggle Test Leave ignition on with PIDs accessed. While observing PID value, wiggle and pull on wiring harness between suspect component and PCM. Lightly tap on suspect component. If PID value(s) remain within specification, go to next step. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace PCM. If replacement PCM does not repair fault, install original PCM. Return to step 1) and choose another procedure.
4. 12) Intermittent Input KOER Wiggle Test Leave ignition on with PIDs accessed. Access PIDs from area of suspect wiring or component fault. Start engine and allow to idle. While observing PID value, wiggle and pull on component wiring and connector. Lightly tap on suspect component. For correct PID values, see PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component. If replacement component does not repair fault, install original component and go to next step.
5. 13) Intermittent KOER Harness Wiggle Test Leave engine running at idle speed with PIDs accessed. While observing PID value, wiggle and pull on wiring harness between suspect component and PCM. Lightly tap on component. If PID value(s) remain within specification, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If sudden change occurs in PID value or PID value drops out of sensor range, isolate fault and repair as necessary. If fault cannot be located, replace PCM. If replacement PCM does not repair fault, install original PCM. Return to step 1) and choose another procedure. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 20). No test procedures have been omitted.
6. 20) Intermittent Output Test Procedure If no symptoms or DTCs are present, perform road test procedure specified in steps 40) through 43). Turn ignition on. Using scan tool, select PIDs from area of suspect wiring or component fault. Record any Continuous Memory DTCs that are present. Turn ignition off. Disconnect 104-pin connector from PCM. Install Breakout Box (014-00959), leaving PCM disconnected. Connect positive lead of voltmeter to output control circuit of suspect component. (Scheme 55) Connect negative lead to ground. Turn ignition on. Using scan tool, enter OUTPUT TEST MODE. Activate suspect component. While observing voltmeter reading and PID value, lightly tap on component. If a fault is indicated, voltage reading will suddenly change. For correct PID values, see PIN VOLTAGE/PID VALUE CHARTS article. If voltage readings are correct and remain stable within one volt, go to next step. If readings are incorrect or unstable within one volt, replace suspect component. If replacement component does not repair fault, install original component and go to next step.
7. 21) Intermittent Output Wiggle Test Leave ignition on with PIDs accessed. While observing voltmeter reading and PID value, wiggle and pull on wiring harness (VPWR and control circuit) between suspect component and PCM. If voltage reading is correct and remains stable within one volt, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If voltage reading is incorrect or unstable within one volt, isolate fault and repair as necessary. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 21) to step 30). No test procedures have been omitted.
8. 30) Intermittent Water Soak Check Procedure Turn ignition off. Connect scan tool to DLC. Using scan tool, select PIDs from area of suspect wiring or component fault. Start engine and allow to idle. Spray water on suspect component, circuit and connector. Include and relays or relay modules associated with fault. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. If no faults occur, go to next step. If fault occurs, isolate fault and repair as necessary.
9. 31) Intermittent Ignition Component Water Soak Test With engine running, spray water on spark plugs, spark plug wires, CKP sensor and CMP sensor. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. For correct PID values, see PIN VOLTAGE/PID VALUE CHARTS article. If no faults occur, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If fault occurs, isolate fault and repair as necessary. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 31) to step 40). No test procedures have been omitted.
10. 40) Intermittent Road Test Procedure This procedure will monitor PIDs and components using a scan tool and breakout box on a road test. An assistant is necessary for some procedures. This procedure is performed under 4 different conditions; KOEO, engine running at idle speed, 30 MPH and 55 MPH. Compare information with specifications listed in PIN VOLTAGE/PID VALUE CHARTS article. Turn ignition off. Using scan tool, select PIDs from area of suspect wiring or fault. Compare values to KOEO values given in PIN VOLTAGE/PID VALUE CHARTS article. Watch for fault indicated by PID value out of specification. If no faults occur, go to next step. If fault occurs, go to step 10) for input system fault or step 20) for output system fault.
11. 41) Intermittent Road Test For Hot Idle With scan tool connected to DLC, remain in PID access mode. Start engine and allow to idle. With engine warmed to operating temperature, watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. Compare values to HOT IDLE values given in PIN VOLTAGE/PID VALUE CHARTS article. If values remain within specification, go to next step. If values do not remain within specification, go to step 10) for input system fault or step 20) for output system fault.
12. 42) Intermittent Road Test For Slow Cruise Leave scan tool connected to DLC in PID access mode. Ensure all accessories are off. Using an assistant, test drive vehicle at 30 MPH. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. Compare values to 30 MPH values given in PIN VOLTAGE/PID VALUE CHARTS article. If PID values remain within specification, go to next step. If PID values do not remain within specification, go to step 10) for input system fault or step 20) for output system fault.
13. 43) Intermittent Road Test For High Cruise Leave scan tool connected to DLC in PID access mode. Test drive vehicle at 55 MPH. Watch for fault indicated by incorrect PID value, sudden change in PID value or fluctuating engine speed. Compare values to 55 MPH values given in PIN VOLTAGE/PID VALUE CHARTS article. If PID values remain within specification, fault cannot be identified with this procedure. Return to step 1) and choose another procedure. If PID values do not remain within specification, go to step 10) for input system fault or step 20) for output system fault. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 43) to step 50). No test procedures have been omitted.
14. 50) Intermittent Ignition Test Procedure Ensure all accessories are off and battery is fully charged. Perform «QUICK TEST»(ref-131243-S07493578722001123100000). If DTCs are present, service as necessary before continuing. If no DTCs are present, connect Rotunda Distributorless Ignition System (DIS) Tester (007-00075) and go to next step. If intermittent ignition analyzer is not available, return to step 1) and choose another procedure.
15. 51) Turn ignition off. Ensure all accessories are off. Install correct overlay on front of tester panel. Install appropriate program cartridge in slot. Connect proper harness adapter to DIS Tester 104-Pin PCM Adapter (007-00110). Ensure WIGGLE TEST switch is off. Disconnect PCM 104-pin connector. Connect tester to PCM wiring harness connector. Turn ignition on. Press RESET button on tester. Tester will perform a self-test and all test LEDs will light and a beep will be heard. If CASE GND fault memory LED stays on, connect a jumper wire between PCM case to ground and continue with test. If tester performs self-test and VPWR LED turns on, go to step 220). If tester does not perform self-test or VPWR LED does not turn on, go to next step.
16. 52) Scan Tester Check Turn ignition off. Disconnect tester. Connect jumper wire between VPWR jack at tester and positive battery terminal. Connect another jumper wire between PWR GND jack at tester and negative battery terminal. If tester performs self-test, go to step 220). If tester does not perform self-test, tester is not functioning properly. Replace tester and retest. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 190). No test procedures have been omitted.
17. 190) Check For Open VPWR Circuit Turn ignition on. Measure voltage between VPWR jack at DIS tester and negative battery terminal. If voltage is more than 6 volts, go to next step. If voltage is 6 volts or less, repair open in VPWR circuit to PCM.
18. 191) Check PWR GND Circuit Turn ignition off. Measure resistance between PWR GND jack at tester and negative battery terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PWR GND circuit to PCM. Go to step 51).
19. 192) Wiggle Check Connect a jumper wire between PWR GND jack at tester and negative battery terminal. Turn ignition on. Set WIGGLE TEST switch on. Set MODE switch to "B" position. Wiggle and bend wiring harness and connectors. If tester resets, repair open in VPWR circuit to PCM. Go to step 51). If tester does not reset, repair open in PWR GND circuit to PCM. Go to step 51). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 192) to step 220). No test procedures have been omitted.
20. 220) Check For Coil Faults Turn ignition on. Press DIS tester RESET button. If COIL FAULT MEMORY LEDs are off, go to next step. If any COIL FAULT MEMORY LED is on or flashing, go to step 229).
21. 221) Check CASE GND/CKP SHIELD Leave ignition on. If CASE GND/CKP SHIELD FAULT MEMORY LED is off, go to next step. If CASE GND/CKP SHIELD FAULT MEMORY is on or flashing, go to step 253).
22. 222) Check CKP BIAS Leave ignition on. If CKP BIAS SYSTEM STATUS LED is on, go to next step. If CKP BIAS SYSTEM STATUS LED is off, go to step 243).
23. 223) Check For Coil Fault With tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If COIL FAULT MEMORY LEDs are off with engine running or during engine cranking, go to next step. If any COIL FAULT MEMORY LED is on, go to step 229).
24. 224) CASE GND/CKP SHIELD Fault With tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CASE GND/CKP SHIELD FAULT MEMORY LED is off with engine running or during engine cranking, go to next step. If CASE GND/CKP SHIELD FAULT MEMORY LED is on, go to step 253).
25. 225) Check CKP Status With tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CKP FAULT MEMORY LED is off with engine running or during engine cranking, go to next step. If CKP FAULT MEMORY LED is on, go to step 247).
26. 226) Check For CTO Fault With tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CTO FAULT MEMORY LED is off with engine running or during engine cranking, go to next step. If CTO FAULT MEMORY LED is on, go to step 239).
27. 227) Check For CKP Signal With tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CKP SIGNAL SYSTEM STATUS LED is on with engine running or during engine cranking, no fault is indicated at this time. Ignition system is okay and testing is complete. If CKP SIGNAL SYSTEM STATUS LED is off, go to step 247). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 227) to step 229). No test procedures have been omitted.
28. 229) Check For Open IGN START/RUN Circuit Turn ignition off. Disconnect ignition coil pack(s). Turn ignition on. Measure voltage between IGN START/RUN terminal at ignition coil pack wiring harness connector and PWR GND jack at tester. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in IGN START/RUN circuit to coil pack(s).
29. 230) Check For Short Turn ignition off. Measure resistance between PWR GND jack and each COIL jack at tester. Also, measure resistance between VPWR jack and each COIL terminal at tester. If all resistance readings are 6000 ohms or more, go to next step. If any resistance reading is less than 6000 ohms, go to step 236).
30. 231) Check COIL Circuit Resistance Turn ignition off. Measure resistance between each COIL jack at tester and same terminal at ignition coil wiring harness connector. If each resistance reading is less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open in appropriate COIL circuit and retest system.
31. 232) Check COIL Circuit For Short Together Measure resistance between each COIL jack and all other COIL jacks at tester. If all resistance readings are 10,000 ohms or more, go to next step. If any resistance is less than 10,000 ohms, go to step 237).
32. 233) Check For Hard Faults Reconnect coil pack(s). Turn ignition on. Press tester RESET button. Wait for initialization and coil test to run. If COIL FAULT MEMORY LEDs are off, go to next step. If any COIL FAULT MEMORY LED is on or flashing, go to step 238).
33. 234) Wiggle Test Mode B Set tester WIGGLE TEST switch on. Set MODE switch to "B" position. Press RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, go to next step. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
34. 235) Wiggle Test Mode B With Coil Disconnected Turn ignition off. Disconnect coil pack(s). Turn ignition on. Press RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, replace PCM and retest. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
35. 236) Circuit Check Turn ignition off. Disconnect PCM. Reconnect tester to vehicle harness. Measure resistance between each COIL jack and PWR GND jack at tester. Also, measure resistance between COIL jack and VPWR jack at tester. If all resistance readings are 10,000 ohms or more, replace PCM and retest. If any resistance reading is less than 10,000 ohms, repair open in COIL circuit.
36. 237) Check For Short Between Coils Ensure ignition is off. Disconnect PCM. Reconnect tester between coils wiring harness. Measure resistance between each COIL jack and all other COIL jacks at tester. If all resistance readings are 10,000 ohms or more, replace PCM and retest. If any resistance reading is less than 10,000 ohms, repair short between COIL circuits.
37. 238) System Visual Check Ensure ignition is off. Check ignition system connectors for loose, damaged or corroded terminals. Repair as necessary and retest. If connectors are okay, replace ignition coil pack(s).
38. 239) Circuit Check Measure resistance between CTO jack and PWR GND jack at tester. Also, measure resistance between CTO jack and VPWR jack at tester. If any resistance reading is less than 1000 ohms, go to next step. If both resistance reading are more than 1000 ohms, go to step 241).
39. 240) Isolate CTO Short Leave ignition off. Disconnect PCM. Reconnect tester to vehicle wiring harness. Measure resistance between CTO jack and PWR GND jack at tester. Also, measure resistance between CTO jack and VPWR jack at tester. If both resistance readings are 1000 ohms or more, replace PCM and retest. If any resistance reading is less than 1000 ohms, repair fault in CTO circuit.
40. 241) Wiggle Test Mode B Turn ignition on. Set tester WIGGLE TEST switch on. Set MODE switch to "B" position. Press tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If all FAULT MEMORY LEDs are off, go to next step. If any FAULT MEMORY LED is on, press RESET button wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
41. 242) Wiggle Test Set MODE switch to "C" position. Press tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If all FAULT MEMORY LEDs are off, replace PCM and retest. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
42. 243) Check CKP BIAS Turn ignition off. Disconnect CKP sensor connector. Turn ignition on. Press tester RESET button and wait 5 seconds for initialization. If CKP BIAS SYSTEM STATUS LED is off, go to next step. If CKP BIAS SYSTEM STATUS LED is on, go to step 245).
43. 244) Isolate Short Circuit Ensure ignition is off. Disconnect PCM. Reconnect tester to vehicle wiring harness. Measure resistance between CKP+ jack and PWR GND jack at tester. Also, measure resistance between CKP+ jack and VPWR jack at tester. If both resistance readings are more than 10,000 ohms, replace PCM and retest. If any resistance reading is 10,000 ohms or less, repair fault in CKP+ circuit.
44. 245) Circuit Check Measure resistance between CKP- jack and PWR GND jack at tester. Also, measure resistance between CKP- jack and VPWR jack at tester. If any resistance reading is 10,000 ohms or less, go to next step. If both resistance readings are more than 10,000 ohms, replace CKP sensor and retest.
45. 246) Isolate Short Circuit Ensure ignition is off. Disconnect PCM. Reconnect tester to vehicle wiring harness. Measure resistance between CKP- jack and PWR GND jack at tester. Also, measure resistance between CKP- jack and VPWR jack at tester. If both resistance readings are more than 10,000 ohms, replace PCM and retest. If any resistance reading is 10,000 ohms or less, repair fault in CKP- circuit.
46. 247) Check CKP Signal Press tester RESET button and wait 5 seconds for initialization. Crank or start engine. If CKP SIGNAL SYSTEM STATUS LED is off with engine running or during engine cranking, go to next step. If CKP SIGNAL SYSTEM STATUS LED is on, go to step 252).
47. 248) Circuit Check Turn ignition off. Disconnect CKP sensor. Measure resistance between CKP+ terminal at CKP sensor wiring harness connector and CKP+ jack at tester. Also, measure resistance between CKP- terminal at CKP sensor wiring harness connector and CKP- jack at tester. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair CKP circuit and retest.
48. 249) Check For CKP+ Short Leave ignition off. Measure resistance between CKP+ jack and jacks for CKP-, PWR GND and VPWR at tester. If any resistance reading is 10,000 ohms or less, go to next step. If all resistance readings are more than 10,000 ohms, go to step 251).
49. 250) Isolate Short Circuit Ensure ignition is off. Disconnect PCM. Reconnect tester to vehicle wiring harness. Measure resistance between CKP+ jack and jacks for CKP-, PWR GND and VPWR at tester. If any resistance reading is 10,000 ohms or less, repair CKP+ circuit and retest. If all resistance readings are more than 10,000 ohms, replace PCM and retest.
50. 251) Sensor Check Turn ignition off. Inspect CKP sensor and pulse wheel for damage and correct alignment. Service sensor and pulse wheel as necessary. If no problems are found, replace CKP sensor and retest.
51. 252) Wiggle Test Mode B: CKP Circuit Turn ignition on. Set tester WIGGLE TEST switch on. Set MODE switch to "B" position. Press tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, go to next step. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
52. 253) Check CKP SHD For Short To Power Turn ignition off. Measure resistance between CASE GND/CKP SHD jack and VPWR jack at tester. If resistance is 10,000 ohms or less, go to next step. If resistance is more than 10,000 ohms, go to step 255).
53. 254) Isolate Short Ensure ignition is off. Disconnect PCM. Reconnect tester to vehicle wiring harness. Measure resistance between CASE GND/CKP SHD jack and VPWR jack at tester. If resistance is 10,000 ohms or less, repair CASE GND/CKP SHD circuit and retest. If resistance is more than 10,000 ohms, replace PCM and retest.
54. 255) Wiggle Test Mode B: CKP Circuit Turn ignition on. Set tester WIGGLE TEST switch on. Set MODE switch to "B" position. Press tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, repair CASE GND/CKP SHD circuit and retest. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.