Engine Controls Self-Diagnostics: Diagnosis Chrysler 300M I

SELF-DIAGNOSTIC SYSTEM

Note. Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRBIII(R)). If using a generic scan tool, ensure it is OBD-II certified. A generic scan tool may not be capable of performing all necessary test functions.

ON-BOARD DIAGNOSTICS

Note. Before performing any testing procedures, check for any related technical service bulletins.

Malfunction Indicator Light (MIL) may also be referred to as CHECK ENGINE light. MIL is located on lower right side of instrument cluster and is represented by an engine symbol. When ignition is first turned on, MIL should come on and remain on for 2 seconds to verify bulb and circuit operation, and then go off. If MIL does not come on at all, check instrument cluster for diagnosis of MIL. See INSTRUMENT CLUSTER SYSTEMS under SYSTEM TESTS in BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.

Powertrain Control Module (PCM) monitors several different engine control system circuits. If a malfunction occurs which affects vehicle emissions, a Diagnostic Trouble Code (DTC) will be stored in PCM memory and PCM will enter limp-in mode. In limp-in mode, PCM substitutes values for the failed component to continue engine operation, but a loss of good driveability may result. When DTC is stored in PCM memory, PCM will turn MIL on and MIL will remain on steady. If problem exists which does not affect vehicle emissions, a DTC will be stored in PCM but MIL will not be turned on.

PCM might not store a DTC for a monitored circuit even though a malfunction has occurred. This may happen because one of the criteria for the DTC has not been met. Criteria may be a specific engine RPM range, engine temperature and/or voltage input to PCM. For example, assume criteria for DTC requires PCM to monitor a specified sensor output circuit only when engine operates at 750-2000 RPM. If sensor output circuit becomes shorted to ground when engine is operating at 2400 RPM, DTC will not be stored, as short to ground occurred at 2400 RPM which exceeds the limit when PCM monitors the circuit.

If PCM detects an active engine misfire severe enough to cause catalytic converter damage, MIL will immediately start flashing to warn driver of possible catalytic converter damage and DTC will be stored. PCM may turn off MIL if malfunction is not detected during 3 consecutive trips, 3 consecutive engine misfire monitor tests or fuel system monitor tests. For additional information on good trips, see TRIP INDICATOR . For additional information on engine misfire monitor and fuel system monitor, see MONITORED CIRCUITS . PCM performs engine misfire and fuel system monitor tests within predetermined engine speed (RPM) and load operating conditions.

DTCs may only be retrieved for system diagnosis by using a scan tool. See RETRIEVING DIAGNOSTIC TROUBLE CODES . System malfunctions are identified as either hard failures or intermittent failures. For additional information on hard failures or intermittent failures, see HARD FAILURES or INTERMITTENT FAILURES .

DIAGNOSTIC PROCEDURE

If no faults were found while performing basic diagnostic procedures in appropriate BASIC DIAGNOSTIC PROCEDURES article, proceed with self-diagnostics. Always perform a visual inspection before attempting to diagnose engine control system problems. See VISUAL INSPECTION .

VISUAL INSPECTION

Most driveability problems in the engine control system result from faulty wiring, poor electrical connections, improper wire routing, or leaking air and vacuum hose connections. Always perform a visual inspection before attempting to diagnose engine control system problems. Inspect all engine control system components, hoses, connectors and wiring for damage before proceeding with system testing. Make repairs as necessary. After completing visual inspection, retrieve Diagnostic Trouble Codes (DTC). See RETRIEVING DIAGNOSTIC TROUBLE CODES .

Scheme 1

1. Turn ignition off. Diagnostic Trouble Codes (DTC) can only be retrieved using a scan tool. Connect scan tool to Data Link Connector (DLC). DLC is located under left side of instrument panel, near steering column. (Scheme 1) Turn ignition on. If scan tool powers up, go to 4. If scan tool will not power up, go to next step.
2. Check for loose cable connections or bad cable. If cable connections or cable are defective, repair or replace components as necessary, and recheck for DTCs, then go to step 4. If cable connections and cable are okay, go to next step.
3. Measure voltage between ground and terminal No. 16 (Red wire) at DLC. Voltage should be 11 volts or more. If voltage is less than 11 volts, check wiring between DLC and junction block. Repair wiring as necessary. Also check fuse No. 18 (20-amp) in junction block. Junction block is located behind end cover on left side of instrument panel.
4. If scan tool displays USER-REQUESTED COLD BOOT error or USER-REQUESTED WARM BOOT error, or any other error message, record entire displayed error message and follow scan tool manufacturer's instructions. If scan tool does not display an error message, go to next step.
5. If scan tool does not display a bus failure, go to next step. If scan tool displays a bus failure error message, this indicates a scan tool failure or a bus circuit failure. To diagnose and repair bus circuit failure, see COMMUNICATIONS under SYSTEM TESTS in BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
6. Using scan tool manufacturer's instructions, read and record DTCs (generic scan tool) or DTC message (DRBIII scan tool), and freeze frame data. If any DTCs are displayed, perform appropriate diagnostic test. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S22861040292001030200000) table under DIAGNOSTIC TROUBLE CODE DEFINITIONS. After repair is complete, clear DTCs from PCM memory and perform appropriate verification test. If no DTCs are displayed, go to one of the following: For starting or driveability problems, go to appropriate TROUBLE SHOOTING - NO CODES article for diagnosis by symptom. For speed control problems and servicing information, refer to appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT. For charging system problems, refer to appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. For transmission electronic controls system problems, refer to appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.

Using Scan Tool

Note. Clearing Diagnostic Trouble Codes (DTC) with a scan tool will also erase all OBD-II monitor data. This includes all counter information for warm-up cycles, trips and freeze frame data.

Connect scan tool to Data Link Connector (DLC), located under left side of instrument panel. (Scheme 1) Turn ignition on. Using screen prompts on scan tool, clear codes from Powertrain Control Module (PCM).

Self-Erasure

After 3 good trips, Powertrain Control Module (PCM) will turn off the MIL. At that time, the PCM will automatically switch the trip counter to a warm-up cycle counter. The PCM will erase DTCs after 40 warm-up cycles (80 for fuel system monitor or misfire monitor) if the recent malfunction does not reoccur in that time. For additional information on good trips and warm-up cycles, see TRIP INDICATOR .

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DIAGNOSTIC TESTS

Note. Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRBIII(R)) scan tool. A generic scan tool may not be capable of performing all necessary test functions.

Testing

1. Using scan tool, read MAP sensor voltage. If voltage is 2.2 volts or more, go to next step. If voltage is less than 2.2 volts, go to step 11.
2. Turn ignition off. Disconnect MAP sensor connector. (Scheme 2)or (Scheme 3). Turn ignition on. Measure voltage between ground and 5-volt supply circuit (Violet/White wire) at MAP sensor harness connector. If voltage is 4.5-5.2 volts, go to next step. If voltage is not 4.5-5.2 volts, go to step 7.
3. Turn ignition off. Ensure MAP sensor connector is still disconnected. Turn ignition on. Using scan tool, read MAP sensor voltage. If voltage is 2.2 volts or less, go to next step. If voltage is more than 2.2 volts, replace MAP sensor.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Dark Green/Red wire) between MAP sensor harness connector and terminal No. 36 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green/Red wire.
5. Measure resistance between ground and signal circuit (Dark Green/Red wire) at MAP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Dark Green/Red wire between MAP sensor and PCM.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. If voltage in step 2 is 5.2 volts or less, go to next step. If voltage in step 2 is more than 5.2 volts, repair short to voltage in Violet/White wire between MAP sensor harness connector and terminal No. 61 at PCM C2 harness connector. (Scheme 4)
8. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and 5-volt supply circuit (Violet/White wire) at MAP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in 5-volt supply circuit. See WIRING DIAGRAMS article.
9. Measure resistance of 5-volt supply circuit (Violet/White wire) between MAP sensor harness connector and terminal No. 61 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/White wire between MAP sensor and PCM.
10. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
11. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between MAP sensor and PCM while monitoring MAP sensor voltage on scan tool. (Scheme 2)or (Scheme 3). see scheme 2 If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 2

Scheme 3

Scheme 4

1. Turn ignition on. Using scan tool, read MAP sensor voltage. If MAP sensor voltage is less than 1.2 volts, go to step 3. If MAP sensor voltage is 1.2 volts or more, go to next step.
2. Start engine. Using scan tool, read MAP sensor voltage. If MAP sensor voltage is less than.04 volt, go to next step. If MAP sensor voltage is.04 volt or more, go to step 11.
3. Turn ignition off. Disconnect MAP sensor connector. (Scheme 2)or (Scheme 3). Turn ignition on. Measure voltage between ground and 5-volt supply circuit (Violet/White wire) at MAP sensor harness connector. If voltage is 4.5-5.2 volts, go to next step. If voltage is not 4.5-5.2 volts, go to step 8.
4. Ensure MAP sensor connector is still disconnected. Using scan tool, read MAP sensor voltage. If voltage is 1.2 volts or less, go to next step. If voltage is more than 1.2 volts, replace MAP sensor.
5. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Dark Green/Red wire) between MAP sensor harness connector and terminal No. 36 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green/Red wire.
6. Measure resistance between signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire) at MAP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Ensure MAP sensor connector is still disconnected. Measure resistance between ground and 5-volt supply circuit (Violet/White wire) at MAP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in 5-volt supply circuit. See WIRING DIAGRAMS article.
9. Measure resistance of 5-volt supply circuit (Violet/White wire) between MAP sensor harness connector and terminal No. 61 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/White wire between MAP sensor and PCM.
10. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
11. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between MAP sensor and PCM while monitoring MAP sensor voltage on scan tool. (Scheme 2)or (Scheme 3). see scheme 2 If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Start engine and let it idle. Using scan tool, read MAP sensor voltage. If voltage is more than 4.6 volts, go to next step. If voltage is 4.6 volts or less, go to step 8.
2. Turn ignition off. Disconnect MAP sensor connector. (Scheme 2)or (Scheme 3). Disconnect PCM harness connectors. see scheme 2 Measure resistance between signal circuit (Dark Green/Red wire) and 5-volt supply circuit (Violet/White wire) at MAP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and 5-volt supply circuit.
3. Reconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and signal circuit (Dark Green/Red wire) at MAP sensor harness connector. If voltage is 5.2 volts or less, go to next step. If voltage is more than 5.2 volts, repair short to voltage in Dark Green/Red wire.
4. Turn ignition off. Connect a jumper wire between signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire) at MAP sensor harness connector. Turn ignition on. Using scan tool, read MAP sensor voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace MAP sensor.
5. Turn ignition off. Remove jumper wire. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Dark Green/Red wire) between MAP sensor harness connector and terminal No. 36 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green/Red wire.
6. Measure resistance of sensor ground circuit (Black/Light Blue wire) between MAP sensor harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between MAP sensor and PCM while monitoring MAP sensor voltage on scan tool. (Scheme 2)or (Scheme 3). see scheme 2 If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Using scan tool, read IAT sensor voltage. If voltage is less than one volt, go to next step. If voltage is one volt or more, go to step 6.
2. Turn ignition off. Disconnect IAT sensor connector. (Scheme 5)or see scheme 8. Turn ignition on. Using scan tool, read IAT sensor voltage. If is more than one volt, replace IAT sensor. If voltage is one volt or less, go to next step.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Black/Red wire) at IAT sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Black/Red wire between PCM and IAT sensor.
4. Measure resistance between signal circuit (Black/Red wire) and sensor ground circuit (Black/Light Blue wire) at IAT sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
5. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
6. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between IAT sensor and PCM while monitoring IAT sensor voltage on scan tool. (Scheme 5)or see scheme 8. see scheme 2 If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 5

1. Turn ignition on. Using scan tool, read IAT sensor voltage. If voltage is more than 4.6 volts, go to next step. If voltage is 4.6 volts or less, go to step 7.
2. Turn ignition off. Disconnect IAT sensor connector. (Scheme 5)or see scheme 8. Turn ignition on. Measure voltage between ground and signal circuit (Black/Red wire) at IAT sensor harness connector. If voltage is 5.2 volts or less, go to next step. If voltage is more than 5.2 volts, repair short to voltage in Black/Red wire between IAT sensor and PCM.
3. Turn ignition off. Connect a jumper wire between signal circuit (Black/Red wire) and sensor ground circuit (Black/Light Blue wire) at IAT sensor harness connector. Turn ignition on. Using scan tool, read IAT sensor voltage. If voltage is less than one volt, replace IAT sensor. If voltage is one volt or more, remove jumper wire and go to next step.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Black/Red wire) between IAT sensor harness connector and terminal No. 37 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Red wire.
5. Measure resistance of sensor ground circuit (Black/Light Blue wire) between IAT sensor harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in sensor ground circuit.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between IAT sensor and PCM while monitoring IAT sensor voltage on scan tool. (Scheme 5)or see scheme 8. see scheme 2 If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read ECT sensor voltage. If voltage is less than one volt, go to next step. If voltage is one volt or more, go to step 6.
2. Turn ignition off. Disconnect ECT sensor harness connector. (Scheme 6)or (Scheme 7). Using scan tool, read ECT sensor voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace ECT sensor.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Tan/Black wire) at ECT sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Tan/Black wire between PCM and ECT sensor.
4. Measure resistance between signal circuit (Tan/Black wire) and sensor ground circuit (Black/Light Blue wire) at ECT sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
5. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
6. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between ECT sensor and PCM while monitoring ECT sensor voltage on scan tool. (Scheme 6)or (Scheme 7). see scheme 2 If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 6

Scheme 7

1. Turn ignition on. Using scan tool, read ECT sensor voltage. If voltage is more than 4.6 volts, go to next step. If voltage is 4.6 volts or less, go to step 7.
2. Turn ignition off. Disconnect ECT sensor connector. (Scheme 6)or (Scheme 7). Turn ignition on. Measure voltage between ground and signal circuit (Tan/Black wire) at ECT sensor harness connector. If voltage is 5.2 volts or less, go to next step. If voltage is more than 5.2 volts, repair short to voltage in Tan/Black wire between ECT sensor and PCM.
3. Turn ignition off. Connect a jumper wire between signal circuit (Tan/Black wire) and sensor ground circuit (Black/Light Blue wire) at ECT sensor harness connector. Turn ignition on. Using scan tool, read ECT sensor voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace ECT sensor.
4. Turn ignition off. Remove jumper wire. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Tan/Black wire) between ECT sensor harness connector and terminal No. 26 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Black wire.
5. Measure resistance of sensor ground circuit (Black/Light Blue wire) between ECT sensor harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between ECT sensor and PCM while monitoring ECT sensor voltage on scan tool. (Scheme 6)or (Scheme 7). see scheme 2 If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. Before proceeding, diagnose any TP sensor or MAP sensor component DTC first. If DTC P0500 is also present, perform diagnosis for DTC P0500 first. Ensure throttle plate and linkage are free from binding and carbon build-up. Ensure throttle plate is in idle position.

1. Turn ignition on. Using scan tool, check for DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 18.
2. Start engine. Using scan tool, read MAP sensor voltage. While observing MAP sensor voltage, snap throttle. If MAP sensor voltage is less than 2 volts at idle and more than 3.5 volts at wide open throttle, go to next step. If MAP sensor voltage is not less than 2 volts at idle and more than 3.5 volts at wide open throttle, go to step 11.
3. Turn ignition off then on. Using scan tool, read TP sensor voltage while slowly depressing throttle from idle position to wide open throttle. Voltage should change smoothly from about.8 volt at idle to more than 3.5 volts at wide open throttle. If voltage is as specified, go to step 18. If voltage is not as specified, go to next step.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Disconnect TP sensor harness connector. TP sensor is located on side of throttle body. Measure resistance of 5-volt supply circuit (Violet/White wire) between TP sensor harness connector and terminal No. 61 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair high resistance in Violet/White wire.
5. Measure resistance between ground and 5-volt supply circuit (Violet/White wire) at TP sensor harness connector. If resistance is more than 100 k/ohms, go to next step. If resistance is 100 k/ohms or less, repair partial short to ground in 5-volt supply circuit. See WIRING DIAGRAMS article.
6. Reconnect PCM harness connectors. Turn ignition on. Using scan tool, read TP sensor voltage. Voltage should be about 4.9 volts. Connect a jumper wire between signal circuit (Orange/Dark Blue wire) and sensor ground circuit (Black/Light Blue wire) at TP sensor harness connector. Voltage should be less than.5 volt. If voltage is as specified, replace TP sensor. If voltage is not as specified, remove jumper wire and go to next step.
7. Turn ignition off. Disconnect PCM harness connector. Measure resistance of signal circuit (Orange/Dark Blue wire) between TP sensor harness connector and terminal No. 35 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair high resistance in Orange/Dark Blue wire.
8. Measure resistance between ground and signal circuit (Orange/Dark Blue wire) at TP sensor harness connector. If resistance is more than 100 k/ohms, go to next step. If resistance is 100 k/ohms or less, repair partial short to ground in Orange/Dark Blue wire. See WIRING DIAGRAMS article.
9. Measure resistance of sensor ground circuit (Black/Light Blue wire) between TP sensor harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair high resistance in Black/Light Blue wire.
10. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
11. Turn ignition off. Disconnect MAP sensor harness connector. (Scheme 2)or (Scheme 3). Disconnect PCM harness connectors. see scheme 2 Measure resistance of 5-volt supply circuit (Violet/White wire) between MAP sensor harness connector and terminal No. 61 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair high resistance in Violet/White wire.
12. Measure resistance between ground and 5-volt supply circuit (Violet/White wire) at MAP sensor harness connector. If resistance is more than 100 k/ohms, go to next step. If resistance is 100 k/ohms or less, repair partial short to ground in 5-volt supply circuit. See WIRING DIAGRAMS article.
13. Turn ignition off. Reconnect PCM harness connectors. Connect a jumper wire between signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire) at MAP sensor harness connector. Using scan tool, read MAP sensor voltage while turning ignition on. Voltage should change from about 4.9 volts with ignition off to less than.5 volt with ignition on. If voltage is as specified, replace MAP sensor. If voltage is not as specified, go to next step.
14. Turn ignition off. Remove jumper wire. Disconnect PCM harness connector. Measure resistance of signal circuit (Dark Green/Red wire) between MAP sensor harness connector and terminal No. 36 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair high resistance in Dark Green/Red wire.
15. Measure resistance between ground and signal circuit (Dark Green/Red wire) at MAP sensor harness connector. If resistance is more than 100 k/ohms, go to next step. If resistance is 100 k/ohms or less, repair partial short to ground in Dark/Green/Red wire.
16. Measure resistance of sensor ground circuit (Black/Light Blue wire) between MAP sensor harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair high resistance in sensor ground circuit.
17. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
18. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring MAP sensor voltage and TP sensor voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read TP sensor voltage. If voltage is less than.2 volt, go to next step. If voltage is.2 volt or more, go to step 11.
2. Turn ignition off. Disconnect TP sensor connector. TP sensor is located on side of throttle body. Turn ignition on. Measure voltage between ground and 5-volt supply circuit (Violet/White wire) at TP sensor harness connector. If voltage is 4.5-5.2 volts, go to next step. If voltage is not 4.5-5.2 volts, go to step 8.
3. Using scan tool, read TP sensor voltage. If voltage is more than 4.5 volts, replace TP sensor. If voltage is 4.5 volts or less, go to next step.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Orange/Dark Blue wire) at TP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in signal circuit. See WIRING DIAGRAMS article.
5. Measure resistance between signal circuit (Orange/Dark Blue wire) and sensor ground circuit (Black/Light Blue wire) at TP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
6. Reconnect PCM harness connectors. Disconnect TCM harness connector. see scheme 2 Turn ignition on. Using scan tool, read TP sensor voltage. If voltage is 4.5 volts or less, go to next step. If voltage is more than 4.5 volts, TCM. Program new TCM. See «PROGRAMMING»(ref-91093-S41080259492001030200000).
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Disconnect TP sensor harness connector. TP sensor is located on side of throttle body. Measure resistance between ground and 5-volt supply circuit (Violet/White wire) at TP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in 5-volt supply circuit. See WIRING DIAGRAMS article.
9. Measure resistance of 5-volt supply circuit (Violet/White wire) between TP sensor harness connector and terminal No. 61 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/White wire.
10. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
11. While monitoring TP sensor voltage on scan tool, slowly open throttle from idle to wide open throttle. Voltage should change smoothly from about.8 volt at idle to more than 3.5 volts at wide open throttle. If voltage is as specified, go to next step. If voltage is not as specified, replace TP sensor.
12. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between TP sensor and PCM while monitoring TP sensor voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read TP sensor voltage. If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, go to step 8.
2. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Disconnect TP sensor harness connector. TP sensor is located on side of throttle body. Measure resistance between signal circuit (Orange/Dark Blue wire) and 5-volt supply circuit (Violet/White wire) at TP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and 5-volt supply circuit. See WIRING DIAGRAMS article.
3. Reconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and signal circuit (Orange/Dark Blue wire) at TP sensor harness connector. If voltage is 5.2 volts or less, go to next step. If voltage is more than 5.2 volts, repair short to voltage in Orange/Dark Blue wire.
4. Turn ignition off. Connect a jumper wire between signal circuit (Orange/Dark Blue wire) and sensor ground circuit (Black/Light Blue wire) at TP sensor harness connector. Turn ignition on. Using scan tool, read TP sensor voltage. If voltage is.5 volt or more, go to next step. If voltage is less than.5 volt, replace TP sensor.
5. Turn ignition off. Remove jumper wire. Disconnect PCM harness connectors. Measure resistance of sensor ground circuit (Black/Light Blue wire) between TP sensor harness connector and terminal No. 43 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
6. Measure resistance of signal circuit (Orange/Dark Blue wire) between TP sensor harness connector and terminal No. 35 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Orange/Dark Blue wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. While monitoring TP sensor voltage on scan tool, slowly open throttle from idle to wide open throttle. Voltage should change smoothly from about.8 volt at idle to more than 3.5 volts at wide open throttle. If voltage is as specified, go to next step. If voltage is not as specified, replace TP sensor.
9. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between TP sensor and PCM while monitoring TP sensor voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. If an Engine Coolant Temperature (ECT) sensor DTC is also stored, diagnose ECT sensor DTC first. Ensure ECT sensor terminals and related PCM terminals are free from corrosion and damage.

Note. To diagnose this DTC, manufacturer recommends allowing vehicle to sit overnight in order to have a totally cold engine. Extremely cold ambient outside temperatures may have caused this DTC to set.

1. Allow engine to cool. Check cooling system for proper coolant level and condition. Repair any coolant leaks and add necessary amount of coolant as necessary. If coolant level is okay and coolant is in good condition, go to next step.
2. Turn ignition on. Using scan tool, read ENG COOLANT TMP DEG value. If engine was allowed to sit overnight, scan tool temperature value should be near ambient air temperature. If engine coolant temperature is more than 180°F (82.2°C), allow engine coolant temperature to cool down to 150°F (65.5°C) before proceeding. If engine coolant temperature is 150°F (65.5°C) or less, start engine. Using scan tool, monitor ENG COOLANT TMP DEG until engine coolant temperature reaches 180°F (82.2°C). Temperature value should increase smoothly from start-up to normal operating temperature. Also monitor actual coolant temperature with a thermometer. As engine warms up to normal operating temperature, actual coolant temperature should be relatively close to temperature reading on scan tool. Monitor coolant temperature and note when thermostat opens. Thermostat should open at about 190°F (87.7°C). Replace thermostat as necessary. If thermostat opens as specified, test is complete.

Note. 1/1 HO2S may also be referred to as an upstream oxygen sensor. 1/1 HO2S is located in outlet flange of right exhaust manifold.

1. Start engine and let it idle. Using scan tool, read 1/1 HO2S voltage. If voltage is less than.16 volt, go to next step. If voltage is.16 volt or more, go to step 7.
2. With engine running, Disconnect 1/1 HO2S harness connector. Using scan tool, read 1/1 HO2S voltage. If voltage is.16 volt or less, go to next step. If voltage is more than.16 volt, replace 1/1 HO2S.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Black/Dark Green wire) at 1/1 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Black/Dark Green wire.
4. Measure resistance between signal circuit (Black/Dark Green wire) and sensor ground circuit (Black/Orange wire) at 1/1 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
5. Measure resistance between signal circuit (Black/Dark Green wire) and heater ground circuit (Black wire) at 1/1 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and heater ground circuit.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/1 HO2S and PCM while monitoring 1/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 1/1 HO2S may also be referred to as an upstream oxygen sensor. 1/1 HO2S is located in outlet flange of right exhaust manifold.

1. Start engine and let it idle. Using scan tool, read 1/1 HO2S voltage. If voltage is more than 1.2 volts, go to next step. If voltage is 1.2 volts or less, go to step 8.
2. With engine running, disconnect 1/1 HO2S harness connector. Using scan tool, read 1/1 HO2S voltage. If voltage is 1.2 volts or more, go to next step. If voltage is less than 1.2 volts, replace 1/1 HO2S.
3. Turn engine off. Turn ignition on. Measure voltage between ground and signal circuit (Black/Dark Green wire) at 1/1 HO2S harness connector. If voltage is 1.2 volts or less, go to next step. If voltage is more than 1.2 volts, repair short to voltage in Black/Dark Green wire.
4. Turn ignition off. Measure resistance between signal circuit (Black/Dark Green wire) and ASD relay output circuit (Orange/Dark Green wire) at 1/1 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and ASD relay output circuit.
5. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Black/Dark Green wire) between 1/1 HO2S harness connector and terminal No. 30 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Dark Green wire.
6. Measure resistance of sensor ground circuit (Black/Orange wire) between 1/1 HO2S harness connector and terminal No. 27 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Orange wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/1 HO2S and PCM while monitoring 1/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 1/1 HO2S may also be referred to as an upstream oxygen sensor. 1/1 HO2S is located in outlet flange of right exhaust manifold.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 6.
2. Start engine and let it idle. Check exhaust system for leaks between engine and 1/1 HO2S. Repair exhaust system leaks as necessary. If exhaust system is okay, go to next step.
3. Measure voltage drop in signal circuit (Black/Dark Green wire) by backprobing between 1/1 HO2S harness connector and terminal No. 30 at PCM C1 harness connector. see scheme 2and (Scheme 4). With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in signal circuit.
4. Measure voltage drop in sensor ground circuit (Black/Orange wire) by backprobing between 1/1 HO2S harness connector and terminal No. 27 at PCM C1 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in sensor ground circuit.
5. If no other possible causes are remaining, 1/1 HO2S is assumed to be defective. Replace 1/1 HO2S.
6. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/1 HO2S and PCM while monitoring 1/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 1/1 HO2S may also be referred to as an upstream oxygen sensor. 1/1 HO2S is located in outlet flange of right exhaust manifold.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect 1/1 HO2S harness connector. Turn ignition on. Connect a test light between positive battery terminal and signal circuit (Black/Dark Green wire) at 1/1 HO2S harness connector. Using scan tool, read 1/1 HO2S voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace 1/1 HO2S.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of sensor ground circuit (Black/Orange wire) between 1/1 HO2S harness connector and terminal No. 27 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Orange wire.
4. Measure resistance of signal circuit (Black/Dark Green wire) between 1/1 HO2S harness connector and terminal No. 30 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Dark Green wire.
5. Reconnect all harness connectors. Start engine and let it idle. Measure voltage drop in sensor ground circuit (Black/Orange wire) by backprobing between 1/1 HO2S harness connector and terminal No. 27 at PCM C1 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in sensor ground circuit.
6. Measure voltage drop in signal circuit (Black/Dark Green wire) by backprobing between 1/1 HO2S harness connector and terminal No. 30 at PCM C1 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in signal circuit.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/1 HO2S and PCM while monitoring 1/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 1/1 HO2S may also be referred to as an upstream oxygen sensor. 1/1 HO2S is located in outlet flange of right exhaust manifold.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to step 3 . If GOOD TRIP counter is not displayed and equal to zero, go to next step.
2. Turn ignition off. Wait at least 8 minutes to allow HO2S to cool until HO2S voltage has stabilized. Using scan tool, actuate O2 HEATER TEST. Using scan tool, monitor 1/1 HO2S voltage for at least 2 minutes. If voltage stays between .4 and .6 volt, go to next step. If voltage does not stay between .4 and .6 volt, go to step 7 .
3. Turn ignition off. Allow HO2S to cool to room temperature. Disconnect 1/1 HO2S harness connector. Measure resistance between HO2S connector (component side) terminals No. 1 (Black wire) and No. 2 (Orange/Dark Green wire). If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace HO2S.
4. Measure resistance between ground and Black wire at 1/1 HO2S harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open between 1/1 HO2S harness connector and ground located behind left headlight.
5. Turn ignition on. Using scan tool, actuate O2 HEATER TEST. Measure voltage between ground and ASD relay output circuit (Orange/Dark Green wire) at 1/1 HO2S harness connector. If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/1 HO2S and PCM while monitoring 1/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 1/2 HO2S may also be referred to as a downstream oxygen sensor. 1/2 HO2S is located behind right catalytic converter.

1. Start engine and let it idle. Using scan tool, read 1/2 HO2S voltage. If voltage is less than.16 volt, go to next step. If voltage is.16 volt or more, go to step 7.
2. With engine running, Disconnect 1/2 HO2S harness connector. Using scan tool, read 1/2 HO2S voltage. If voltage is.16 volt or less, go to next step. If voltage is more than.16 volt, replace 1/2 HO2S.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Tan/White wire) at 1/2 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Tan/White wire.
4. Measure resistance between signal circuit (Tan/White wire) and sensor ground circuit (Black/Light Blue wire) at 1/2 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
5. Measure resistance between signal circuit (Tan/White wire) and heater ground circuit (Black wire) at 1/2 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and heater ground circuit.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/2 HO2S and PCM while monitoring 1/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 1/2 HO2S may also be referred to as a downstream oxygen sensor. 1/2 HO2S is located behind right catalytic converter.

1. Start engine and let it idle. Using scan tool, read 1/2 HO2S voltage. If voltage is more than 1.2 volts, go to next step. If voltage is 1.2 volts or less, go to step 8.
2. With engine running, disconnect 1/2 HO2S harness connector. Using scan tool, read 1/2 HO2S voltage. If voltage is 1.2 volts or more, go to next step. If voltage is less than 1.2 volts, replace 1/2 HO2S.
3. Turn engine off. Turn ignition on. Measure voltage between ground and signal circuit (Tan/White wire) at 1/2 HO2S harness connector. If voltage is 1.2 volts or less, go to next step. If voltage is more than 1.2 volts, repair short to voltage in Tan/White wire.
4. Turn ignition off. Measure resistance between signal circuit (Tan/White wire) and ASD relay output circuit (Orange/Dark Green wire) at 1/2 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and ASD relay output circuit.
5. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Tan/White wire) between 1/2 HO2S harness connector and terminal No. 51 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/White wire.
6. Measure resistance of sensor ground circuit (Black/Light Blue wire) between 1/2 HO2S harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/2 HO2S and PCM while monitoring 1/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 1/2 HO2S may also be referred to as a downstream oxygen sensor. 1/2 HO2S is located behind right catalytic converter.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 6.
2. Start engine and let it idle. Check exhaust system for leaks between engine and 1/2 HO2S. Repair exhaust system leaks as necessary. If exhaust system is okay, go to next step.
3. Measure voltage drop in signal circuit (Tan/White wire) by backprobing between 1/2 HO2S harness connector and terminal No. 51 at PCM C2 harness connector. see scheme 2and (Scheme 4). With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in signal circuit.
4. Measure voltage drop in sensor ground circuit (Black/Light Blue wire) by backprobing between 1/2 HO2S harness connector and terminal No. 43 at PCM C2 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in sensor ground circuit.
5. If no other possible causes are remaining, 1/2 HO2S is assumed to be defective. Replace 1/2 HO2S.
6. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/2 HO2S and PCM while monitoring 1/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 1/2 HO2S may also be referred to as a downstream oxygen sensor. 1/2 HO2S is located behind right catalytic converter.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect 1/2 HO2S harness connector. Turn ignition on. Connect a test light between positive battery terminal and signal circuit (Tan/White wire) at 1/2 HO2S harness connector. Using scan tool, read 1/2 HO2S voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace 1/2 HO2S.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of sensor ground circuit (Black/Light Blue wire) between 1/2 HO2S harness connector and terminal No. 43 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
4. Measure resistance of signal circuit (Tan/White wire) between 1/2 HO2S harness connector and terminal No. 51 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/White wire.
5. Reconnect all harness connectors. Start engine and let it idle. Measure voltage drop in sensor ground circuit (Black/Light Blue wire) by backprobing between 1/2 HO2S harness connector and terminal No. 43 at PCM C2 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in sensor ground circuit.
6. Measure voltage drop in signal circuit (Tan/White wire) by backprobing between 1/2 HO2S harness connector and terminal No. 51 at PCM C2 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in signal circuit.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/2 HO2S and PCM while monitoring 1/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 1/2 HO2S may also be referred to as a downstream oxygen sensor. 1/2 HO2S is located behind right catalytic converter.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to step 3 . If GOOD TRIP counter is not displayed and equal to zero, go to next step.
2. Turn ignition off. Wait at least 8 minutes to allow HO2S to cool until HO2S voltage has stabilized. Using scan tool, actuate O2 HEATER TEST. Using scan tool, monitor 1/2 HO2S voltage for at least 2 minutes. If voltage stays between .4 and .6 volt, go to next step. If voltage does not stay between .4 and .6 volt, go to step 7 .
3. Turn ignition off. Allow HO2S to cool to room temperature. Disconnect 1/2 HO2S harness connector. Measure resistance between HO2S connector (component side) terminals No. 1 (Black wire) and No. 2 (Orange/Dark Green wire). If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace HO2S.
4. Measure resistance between ground and Black wire at 1/2 HO2S harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open between 1/2 HO2S harness connector and ground located behind left headlight.
5. Turn ignition on. Using scan tool, actuate O2 HEATER TEST. Measure voltage between ground and ASD relay output circuit (Orange/Dark Green wire) at 1/2 HO2S harness connector. If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 1/2 HO2S and PCM while monitoring 1/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/1 HO2S may also be referred to as an upstream oxygen sensor. 2/1 HO2S is located in outlet flange of left exhaust manifold.

1. Start engine and let it idle. Using scan tool, read 2/1 HO2S voltage. If voltage is less than.16 volt, go to next step. If voltage is.16 volt or more, go to step 7.
2. With engine running, Disconnect 2/1 HO2S harness connector. Using scan tool, read 2/1 HO2S voltage. If voltage is.16 volt or less, go to next step. If voltage is more than.16 volt, replace 2/1 HO2S.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Light Green/Red wire) at 2/1 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Light Green/Red wire.
4. Measure resistance between signal circuit (Light Green/Red wire) and sensor ground circuit (Black/Orange wire) at 2/1 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
5. Measure resistance between signal circuit (Light Green/Red wire) and heater ground circuit (Black wire) at 2/1 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and heater ground circuit.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/1 HO2S and PCM while monitoring 2/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/1 HO2S may also be referred to as an upstream oxygen sensor. 2/1 HO2S is located in outlet flange of left exhaust manifold.

1. Start engine and let it idle. Using scan tool, read 2/1 HO2S voltage. If voltage is more than 1.2 volts, go to next step. If voltage is 1.2 volts or less, go to step 8.
2. With engine running, disconnect 2/1 HO2S harness connector. Using scan tool, read 2/1 HO2S voltage. If voltage is 1.2 volts or more, go to next step. If voltage is less than 1.2 volts, replace 2/1 HO2S.
3. Turn engine off. Turn ignition on. Measure voltage between ground and signal circuit (Light Green/Red wire) at 2/1 HO2S harness connector. If voltage is 1.2 volts or less, go to next step. If voltage is more than 1.2 volts, repair short to voltage in Light Green/Red wire.
4. Turn ignition off. Measure resistance between signal circuit (Light Green/Red wire) and ASD relay output circuit (Orange/Dark Green wire) at 2/1 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and ASD relay output circuit.
5. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Light Green/Red wire) between 2/1 HO2S harness connector and terminal No. 29 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Red wire.
6. Measure resistance of sensor ground circuit (Black/Orange wire) between 2/1 HO2S harness connector and terminal No. 27 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Orange wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/1 HO2S and PCM while monitoring 2/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/1 HO2S may also be referred to as an upstream oxygen sensor. 2/1 HO2S is located in outlet flange of left exhaust manifold.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 6.
2. Start engine and let it idle. Check exhaust system for leaks between engine and 2/1 HO2S. Repair exhaust system leaks as necessary. If exhaust system is okay, go to next step.
3. Measure voltage drop in signal circuit (Light Green/Red wire) by backprobing between 2/1 HO2S harness connector and terminal No. 29 at PCM C1 harness connector. see scheme 2and (Scheme 4). With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in signal circuit.
4. Measure voltage drop in sensor ground circuit (Black/Orange wire) by backprobing between 2/1 HO2S harness connector and terminal No. 27 at PCM C1 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in sensor ground circuit.
5. If no other possible causes are remaining, 2/1 HO2S is assumed to be defective. Replace 2/1 HO2S.
6. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/1 HO2S and PCM while monitoring 2/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/1 HO2S may also be referred to as an upstream oxygen sensor. 2/1 HO2S is located in outlet flange of left exhaust manifold.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect 2/1 HO2S harness connector. Turn ignition on. Connect a test light between positive battery terminal and signal circuit (Light Green/Red wire) at 2/1 HO2S harness connector. Using scan tool, read 2/1 HO2S voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace 2/1 HO2S.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of sensor ground circuit (Black/Orange wire) between 2/1 HO2S harness connector and terminal No. 27 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Orange wire.
4. Measure resistance of signal circuit (Light Green/Red wire) between 2/1 HO2S harness connector and terminal No. 29 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Red wire.
5. Reconnect all harness connectors. Start engine and let it idle. Measure voltage drop in sensor ground circuit (Black/Orange wire) by backprobing between 2/1 HO2S harness connector and terminal No. 27 at PCM C1 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in sensor ground circuit.
6. Measure voltage drop in signal circuit (Light Green/Red wire) by backprobing between 2/1 HO2S harness connector and terminal No. 29 at PCM C1 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in signal circuit.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/1 HO2S and PCM while monitoring 2/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/1 HO2S may also be referred to as an upstream oxygen sensor. 2/1 HO2S is located in outlet flange of left exhaust manifold.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to step 3 . If GOOD TRIP counter is not displayed and equal to zero, go to next step.
2. Turn ignition off. Wait at least 8 minutes to allow HO2S to cool until HO2S voltage has stabilized. Using scan tool, actuate O2 HEATER TEST. Using scan tool, monitor 2/1 HO2S voltage for at least 2 minutes. If voltage stays between .4 and .6 volt, go to next step. If voltage does not stay between .4 and .6 volt, go to step 7 .
3. Turn ignition off. Allow HO2S to cool to room temperature. Disconnect 2/1 HO2S harness connector. Measure resistance between HO2S connector (component side) terminals No. 1 (Black wire) and No. 2 (Orange/Dark Green wire). If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace HO2S.
4. Measure resistance between ground and Black wire at 2/1 HO2S harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open between 2/1 HO2S harness connector and ground located behind left headlight.
5. Turn ignition on. Using scan tool, actuate O2 HEATER TEST. Measure voltage between ground and ASD relay output circuit (Orange/Dark Green wire) at 2/1 HO2S harness connector. If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/1 HO2S and PCM while monitoring 2/1 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/2 HO2S may also be referred to as an downstream oxygen sensor. 2/2 HO2S is located behind left catalytic converter.

1. Start engine and let it idle. Using scan tool, read 2/2 HO2S voltage. If voltage is less than.16 volt, go to next step. If voltage is.16 volt or more, go to step 7.
2. With engine running, Disconnect 2/2 HO2S harness connector. Using scan tool, read 2/2 HO2S voltage. If voltage is.16 volt or less, go to next step. If voltage is more than.16 volt, replace 2/2 HO2S.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Pink/White wire) at 2/2 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Pink/White wire.
4. Measure resistance between signal circuit (Pink/White wire) and sensor ground circuit (Black/Light Blue wire) at 2/2 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
5. Measure resistance between signal circuit (Pink/White wire) and heater ground circuit (Black wire) at 2/2 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and heater ground circuit.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/2 HO2S and PCM while monitoring 2/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/2 HO2S may also be referred to as an downstream oxygen sensor. 2/2 HO2S is located behind left catalytic converter.

1. Start engine and let it idle. Using scan tool, read 2/2 HO2S voltage. If voltage is more than 1.2 volts, go to next step. If voltage is 1.2 volts or less, go to step 8.
2. With engine running, disconnect 2/2 HO2S harness connector. Using scan tool, read 2/2 HO2S voltage. If voltage is 1.2 volts or more, go to next step. If voltage is less than 1.2 volts, replace 2/2 HO2S.
3. Turn engine off. Turn ignition on. Measure voltage between ground and signal circuit (Pink/White wire) at 2/2 HO2S harness connector. If voltage is 1.2 volts or less, go to next step. If voltage is more than 1.2 volts, repair short to voltage in Pink/White wire.
4. Turn ignition off. Measure resistance between signal circuit (Pink/White wire) and ASD relay output circuit (Orange/Dark Green wire) at 2/2 HO2S harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and ASD relay output circuit.
5. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Pink/White wire) between 2/2 HO2S harness connector and terminal No. 53 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Pink/White wire.
6. Measure resistance of sensor ground circuit (Black/Light Blue wire) between 2/2 HO2S harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/2 HO2S and PCM while monitoring 2/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/2 HO2S may also be referred to as an downstream oxygen sensor. 2/2 HO2S is located behind left catalytic converter.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 6.
2. Start engine and let it idle. Check exhaust system for leaks between engine and 2/2 HO2S. Repair exhaust system leaks as necessary. If exhaust system is okay, go to next step.
3. Measure voltage drop in signal circuit (Pink/White wire) by backprobing between 2/2 HO2S harness connector and terminal No. 53 at PCM C2 harness connector. see scheme 2and (Scheme 4). With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in signal circuit.
4. Measure voltage drop in sensor ground circuit (Black/Light Blue wire) by backprobing between 2/2 HO2S harness connector and terminal No. 43 at PCM C2 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in sensor ground circuit.
5. If no other possible causes are remaining, 2/2 HO2S is assumed to be defective. Replace 2/2 HO2S.
6. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/2 HO2S and PCM while monitoring 2/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/2 HO2S may also be referred to as an downstream oxygen sensor. 2/2 HO2S is located behind left catalytic converter.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect 2/2 HO2S harness connector. Turn ignition on. Connect a test light between positive battery terminal and signal circuit (Pink/White wire) at 2/2 HO2S harness connector. Using scan tool, read 2/2 HO2S voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace 2/2 HO2S.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of sensor ground circuit (Black/Light Blue wire) between 2/2 HO2S harness connector and terminal No. 43 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
4. Measure resistance of signal circuit (Pink/White wire) between 2/2 HO2S harness connector and terminal No. 53 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Pink/White wire.
5. Reconnect all harness connectors. Start engine and let it idle. Measure voltage drop in sensor ground circuit (Black/Light Blue wire) by backprobing between 2/2 HO2S harness connector and terminal No. 43 at PCM C2 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in sensor ground circuit.
6. Measure voltage drop in signal circuit (Pink/White wire) by backprobing between 2/2 HO2S harness connector and terminal No. 53 at PCM C2 harness connector. With engine idling, note voltage reading. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in signal circuit.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/2 HO2S and PCM while monitoring 2/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. 2/2 HO2S may also be referred to as an downstream oxygen sensor. 2/2 HO2S is located behind left catalytic converter.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to step 3 . If GOOD TRIP counter is not displayed and equal to zero, go to next step.
2. Turn ignition off. Wait at least 8 minutes to allow HO2S to cool until HO2S voltage has stabilized. Using scan tool, actuate O2 HEATER TEST. Using scan tool, monitor 2/2 HO2S voltage for at least 2 minutes. If voltage stays between .4 and .6 volt, go to next step. If voltage does not stay between .4 and .6 volt, go to step 7 .
3. Turn ignition off. Allow HO2S to cool to room temperature. Disconnect 2/2 HO2S harness connector. Measure resistance between HO2S connector (component side) terminals No. 1 (Black wire) and No. 2 (Orange/Dark Green wire). If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace HO2S.
4. Measure resistance between ground and Black wire at 2/2 HO2S harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open between 2/2 HO2S harness connector and ground located behind left headlight.
5. Turn ignition on. Using scan tool, actuate O2 HEATER TEST. Measure voltage between ground and ASD relay output circuit (Orange/Dark Green wire) at 2/2 HO2S harness connector. If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle wiring harness between 2/2 HO2S and PCM while monitoring 2/2 HO2S voltage on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 16. WARNING: Fuel system is under constant pressure even when ignition is off. Open fuel system with caution.
2. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-91093-S02336376282001030200000). Install fuel pressure gauge to fuel rail. On 2.7L engines, use Fuel Adapter (6539). On all engines, turn ignition on. Using scan tool, actuate ASD FUEL SYSTEM TEST. Observe fuel pressure gauge. Note fuel pressure reading, stop ASD FUEL SYSTEM TEST and turn ignition off. Fuel pressure should be 53-63 psi (365-434 kPa). If fuel pressure is as specified, go to step 6. If fuel pressure is less than specified, go to next step. If fuel pressure is more than specified, replace fuel filter/pressure regulator.
3. Release fuel pressure. Raise and support vehicle. Disconnect fuel pressure line from fuel pump module. Connect 5/16 Fuel Line Adapter (6539) between disconnected fuel line and fuel pump module. Connect fuel pressure gauge to "T" on fuel line adapter. Turn ignition on. Using scan tool, actuate ASD FUEL SYSTEM TEST. Observe fuel pressure gauge. Note fuel pressure reading, stop ASD FUEL SYSTEM TEST and turn ignition off. If fuel pressure is 53-63 psi (365-434 kPa), repair or replace fuel supply line as necessary. If fuel pressure is not 53-63 psi (365-434 kPa), go to next step.
4. Remove fuel pump module from fuel tank. Inspect fuel inlet strainer. If fuel inlet strainer is plugged, replace fuel inlet strainer. If fuel inlet strainer is not plugged, go to next step.
5. If no other possible causes are remaining, fuel pump module is assumed to be defective. Replace fuel pump module.
6. Turn ignition on. Using scan tool, read 1/1 HO2S voltage. If voltage is.4-.6 volt, go to next step. If voltage is not.4-.6 volt, go to step 13.
7. Turn ignition off. Wait at least 10 minutes for HO2S to cool. Turn ignition on. Using scan tool, actuate 1/1 HO2S heater test. Using scan tool, monitor 1/1 HO2S voltage for at least 2 minutes. If voltage stays between.4 and.6 volt, replace 1/1 HO2S. If voltage does not stay between.4 and.6 volt, go to next step.
8. Using scan tool, read TP sensor voltage. Ensure throttle is fully closed and against stop. If voltage is.92 volt or less, go to next step. If voltage is more than.92 volt, check for binding throttle. Repair throttle as necessary. If throttle is not binding, replace TP sensor.
9. While monitoring TP sensor voltage on scan tool, slowly open and close throttle. If voltage increases and decreases smoothly in response to throttle opening and closing, go to next step. If voltage does not increase and decrease smoothly in response to throttle opening and closing, replace TP sensor.
10. Turn ignition off. Connect a vacuum gauge to a manifold vacuum source. Start engine and let it idle. If engine will not idle, slightly open throttle and maintain a constant RPM. Using scan tool, read MAP sensor vacuum value. If vacuum gauge reading is within one in. Hg of scan tool display, go to next step. If vacuum gauge reading is not within one in. Hg of scan tool display, replace MAP sensor. NOTE: Thermostat must be operating properly for the following test to be valid. This test works best if performed on a cold engine.
11. Turn ignition on. Using scan tool, read ECT sensor value. If engine was allowed to sit overnight, ECT sensor value should be near ambient air temperature value. If ECT sensor value is more than 180°F (82.2°C), allow engine to cool until ECT sensor value is 150°F (65.5.°C) before proceeding. If ECT sensor value is 150°F (65.5°C) or less, start engine. Using scan tool, monitor ECT sensor value until it reaches 180°F (82.2°C). ECT sensor value should increase smoothly from start-up to normal operating temperature and should reach at least 180°F (82.2°C). If ECT sensor value increased smoothly and reached at least 180°F (82.2°C), go to next step. If ECT sensor value did not increase smoothly or did not reach at least 180°F (82.2°C), replace ECT sensor.
12. Check for any of the following conditions: Ensure air intake system is free from leaks. Ensure engine vacuum is at least 13 in. Hg at idle in Park or Neutral. Ensure valve timing is correct. Ensure engine compression is within specification. Ensure exhaust system is free from restrictions or leaks. Ensure PCV system flows freely. Ensure torque converter stall speed is within specification. Ensure power brake booster has no internal vacuum leaks. Ensure fuel is not contaminated. Ensure fuel injectors are not restricted. Ensure fuel injector harness connectors are connected to correct fuel injectors. If a problem exists, repair as necessary. If no problems exist, test is complete.
13. Disconnect 1/1 HO2S harness connector. Using scan tool, read 1/1 HO2S voltage. If voltage is.4-.6 volt, replace 1/1 HO2S. If voltage is not.4-.6 volt, go to next step.
14. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Black/Dark Green wire) at 1/1 HO2S harness connector. If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, repair short to ground in Black/Dark Green wire.
15. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
16. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 18. WARNING: Fuel system is under constant pressure even when ignition is off. Open fuel system with caution.
2. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-91093-S02336376282001030200000). Install fuel pressure gauge to fuel rail. On 2.7L engines, use Fuel Adapter (6539). On all engines, turn ignition on. Using scan tool, actuate ASD FUEL SYSTEM TEST. Observe fuel pressure gauge. Note fuel pressure reading, stop ASD FUEL SYSTEM TEST and turn ignition off. Fuel pressure should be 53-63 psi (365-434 kPa). If fuel pressure is as specified, go to step 6. If fuel pressure is less than specified, go to next step. If fuel pressure is more than specified, replace fuel filter/pressure regulator.
3. Release fuel pressure. Raise and support vehicle. Disconnect fuel pressure line from fuel pump module. Connect 5/16 Fuel Line Adapter (6539) between disconnected fuel line and fuel pump module. Connect fuel pressure gauge to "T" on fuel line adapter. Turn ignition on. Using scan tool, actuate ASD FUEL SYSTEM TEST. Observe fuel pressure gauge. Note fuel pressure reading, stop ASD FUEL SYSTEM TEST and turn ignition off. If fuel pressure is 53-63 psi (365-434 kPa), repair or replace fuel supply line as necessary. If fuel pressure is not 53-63 psi (365-434 kPa), go to next step.
4. Remove fuel pump module from fuel tank. Inspect fuel inlet strainer. If fuel inlet strainer is plugged, replace fuel inlet strainer. If fuel inlet strainer is not plugged, go to next step.
5. If no other possible causes are remaining, fuel pump module is assumed to be defective. Replace fuel pump module.
6. Turn ignition on. Using scan tool, read 1/1 HO2S voltage. If voltage is.4-.6 volt, go to next step. If voltage is not.4-.6 volt, go to step 14.
7. Turn ignition off. Wait at least 10 minutes for HO2S to cool. Turn ignition on. Using scan tool, actuate 1/1 HO2S heater test. Using scan tool, monitor 1/1 HO2S voltage for at least 2 minutes. If voltage stays between.4 and.6 volt, replace 1/1 HO2S. If voltage does not stay between.4 and.6 volt, go to next step.
8. Start engine and warm to normal operating temperature. Ensure engine is operating in closed loop. Using scan tool, select SYSTEM TESTS, then perform PURGE VAPORS TEST. Observe SHORT TERM ADAPTIVE value on scan tool, then press "3" to flow. If SHORT TERM ADAPTIVE value changes, go to next step. If SHORT TERM ADAPTIVE value does not change, go to CHECKING EVAPORATIVE EMISSION SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.
9. Turn ignition off then on. Ensure throttle is completely closed. Using scan tool, read TP sensor voltage. If TP sensor voltage is.92 volt or less, go to next step. If voltage is more than.92 volt, check for binding throttle. Repair throttle as necessary. If throttle is not binding, replace TP sensor.
10. While monitoring TP sensor voltage on scan tool, slowly open and close throttle. If voltage increases and decreases smoothly in response to throttle opening and closing, go to next step. If voltage does not increase and decrease smoothly in response to throttle opening and closing, replace TP sensor.
11. Turn ignition off. Connect a vacuum gauge to a manifold vacuum source. Start engine and let it idle. If engine will not idle, slightly open throttle and maintain a constant RPM. Using scan tool, read MAP sensor vacuum value. If vacuum gauge reading is within one in. Hg of scan tool display, go to next step. If vacuum gauge reading is not within one in. Hg of scan tool display, replace MAP sensor. NOTE: Thermostat must be operating properly for the following test to be valid. This test works best if performed on a cold engine.
12. Turn ignition on. Using scan tool, read ECT sensor value. If engine was allowed to sit overnight, ECT sensor value should be near ambient air temperature value. If ECT sensor value is more than 180°F (82.2°C), allow engine to cool until ECT sensor value is 150°F (65.5.°C) before proceeding. If ECT sensor value is 150°F (65.5°C) or less, start engine. Using scan tool, monitor ECT sensor value until it reaches 180°F (82.2°C). ECT sensor value should increase smoothly from start-up to normal operating temperature and should reach at least 180°F (82.2°C). If ECT sensor value increased smoothly and reached at least 180°F (82.2°C), go to next step. If ECT sensor value did not increase smoothly or did not reach at least 180°F (82.2°C), replace ECT sensor.
13. Check for any of the following conditions: Ensure air intake system is free from leaks. Ensure engine vacuum is at least 13 in. Hg at idle in Park or Neutral. Ensure valve timing is correct. Ensure engine compression is within specification. Ensure exhaust system is free from restrictions or leaks. Ensure PCV system flows freely. Ensure torque converter stall speed is within specification. Ensure power brake booster has no internal vacuum leaks. Ensure fuel is not contaminated. Ensure fuel injectors are not restricted. Ensure fuel injector harness connectors are connected to correct fuel injectors. If a problem exists, repair as necessary. If no problems exist, test is complete.
14. Disconnect 1/1 HO2S harness connector. Using scan tool, read 1/1 HO2S voltage. If voltage is.4-.6 volt, replace 1/1 HO2S. If voltage is not.4-.6 volt, go to next step.
15. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Black/Dark Green wire) between 1/1 HO2S harness connector and terminal No. 30 at PCM C1 harness connector. (Scheme 4) If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Black/Dark Green wire.
16. Turn ignition off. Reconnect PCM harness connectors. Start engine. Measure voltage between ground and signal circuit (Black/Dark Green wire) at 1/1 HO2S harness connector. If voltage is.6 volt or less, go to next step. If voltage is more than.6 volt, repair short to voltage in Black/Dark Green wire.
17. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
18. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. Check for contaminates that may have damaged HO2S such as contaminated fuel, unapproved silicone, oil or coolant.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 16. WARNING: Fuel system is under constant pressure even when ignition is off. Open fuel system with caution.
2. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-91093-S02336376282001030200000). Install fuel pressure gauge to fuel rail. On 2.7L engines, use Fuel Adapter (6539). On all engines, turn ignition on. Using scan tool, actuate ASD FUEL SYSTEM TEST. Observe fuel pressure gauge. Note fuel pressure reading, stop ASD FUEL SYSTEM TEST and turn ignition off. Fuel pressure should be 53-63 psi (365-434 kPa). If fuel pressure is as specified, go to step 6. If fuel pressure is less than specified, go to next step. If fuel pressure is more than specified, replace fuel filter/pressure regulator.
3. Release fuel pressure. Raise and support vehicle. Disconnect fuel pressure line from fuel pump module. Connect 5/16 Fuel Line Adapter (6539) between disconnected fuel line and fuel pump module. Connect fuel pressure gauge to "T" on fuel line adapter. Turn ignition on. Using scan tool, actuate ASD FUEL SYSTEM TEST. Observe fuel pressure gauge. Note fuel pressure reading, stop ASD FUEL SYSTEM TEST and turn ignition off. If fuel pressure is 53-63 psi (365-434 kPa), repair or replace fuel supply line as necessary. If fuel pressure is not 53-63 psi (365-434 kPa), go to next step.
4. Remove fuel pump module from fuel tank. Inspect fuel inlet strainer. If fuel inlet strainer is plugged, replace fuel inlet strainer. If fuel inlet strainer is not plugged, go to next step.
5. If no other possible causes are remaining, fuel pump module is assumed to be defective. Replace fuel pump module.
6. Turn ignition on. Using scan tool, read 2/1 HO2S voltage. If voltage is.4-.6 volt, go to next step. If voltage is not.4-.6 volt, go to step 13.
7. Turn ignition off. Wait at least 10 minutes for HO2S to cool. Turn ignition on. Using scan tool, actuate 2/1 HO2S heater test. Using scan tool, monitor 2/1 HO2S voltage for at least 2 minutes. If voltage stays between.4 and.6 volt, replace 2/1 HO2S. If voltage does not stay between.4 and.6 volt, go to next step.
8. Using scan tool, read TP sensor voltage. Ensure throttle is fully closed and against stop. If voltage is.92 volt or less, go to next step. If voltage is more than.92 volt, check for binding throttle. Repair throttle as necessary. If throttle is not binding, replace TP sensor.
9. While monitoring TP sensor voltage on scan tool, slowly open and close throttle. If voltage increases and decreases smoothly in response to throttle opening and closing, go to next step. If voltage does not increase and decrease smoothly in response to throttle opening and closing, replace TP sensor.
10. Turn ignition off. Connect a vacuum gauge to a manifold vacuum source. Start engine and let it idle. If engine will not idle, slightly open throttle and maintain a constant RPM. Using scan tool, read MAP sensor vacuum value. If vacuum gauge reading is within one in. Hg of scan tool display, go to next step. If vacuum gauge reading is not within one in. Hg of scan tool display, replace MAP sensor. NOTE: Thermostat must be operating properly for the following test to be valid. This test works best if performed on a cold engine.
11. Turn ignition on. Using scan tool, read ECT sensor value. If engine was allowed to sit overnight, ECT sensor value should be near ambient air temperature value. If ECT sensor value is more than 180°F (82.2°C), allow engine to cool until ECT sensor value is 150°F (65.5.°C) before proceeding. If ECT sensor value is 150°F (65.5°C) or less, start engine. Using scan tool, monitor ECT sensor value until it reaches 180°F (82.2°C). ECT sensor value should increase smoothly from start-up to normal operating temperature and should reach at least 180°F (82.2°C). If ECT sensor value increased smoothly and reached at least 180°F (82.2°C), go to next step. If ECT sensor value did not increase smoothly or did not reach at least 180°F (82.2°C), replace ECT sensor.
12. Check for any of the following conditions: Ensure air intake system is free from leaks. Ensure engine vacuum is at least 13 in. Hg at idle in Park or Neutral. Ensure valve timing is correct. Ensure engine compression is within specification. Ensure exhaust system is free from restrictions or leaks. Ensure PCV system flows freely. Ensure torque converter stall speed is within specification. Ensure power brake booster has no internal vacuum leaks. Ensure fuel is not contaminated. Ensure fuel injectors are not restricted. Ensure fuel injector harness connectors are connected to correct fuel injectors. If a problem exists, repair as necessary. If no problems exist, test is complete.
13. Disconnect 2/1 HO2S harness connector. Using scan tool, read 2/1 HO2S voltage. If voltage is.4-.6 volt, replace 2/1 HO2S. If voltage is not.4-.6 volt, go to next step.
14. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Light Green/Red wire) at 2/1 HO2S harness connector. If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, repair short to ground in Light Green/Red wire.
15. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
16. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 18. WARNING: Fuel system is under constant pressure even when ignition is off. Open fuel system with caution.
2. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-91093-S02336376282001030200000). Install fuel pressure gauge to fuel rail. On 2.7L engines, use Fuel Adapter (6539). On all engines, turn ignition on. Using scan tool, actuate ASD FUEL SYSTEM TEST. Observe fuel pressure gauge. Note fuel pressure reading, stop ASD FUEL SYSTEM TEST and turn ignition off. Fuel pressure should be 53-63 psi (365-434 kPa). If fuel pressure is as specified, go to step 6. If fuel pressure is less than specified, go to next step. If fuel pressure is more than specified, replace fuel filter/pressure regulator.
3. Release fuel pressure. Raise and support vehicle. Disconnect fuel pressure line from fuel pump module. Connect 5/16 Fuel Line Adapter (6539) between disconnected fuel line and fuel pump module. Connect fuel pressure gauge to "T" on fuel line adapter. Turn ignition on. Using scan tool, actuate ASD FUEL SYSTEM TEST. Observe fuel pressure gauge. Note fuel pressure reading, stop ASD FUEL SYSTEM TEST and turn ignition off. If fuel pressure is 53-63 psi (365-434 kPa), repair or replace fuel supply line as necessary. If fuel pressure is not 53-63 psi (365-434 kPa), go to next step.
4. Remove fuel pump module from fuel tank. Inspect fuel inlet strainer. If fuel inlet strainer is plugged, replace fuel inlet strainer. If fuel inlet strainer is not plugged, go to next step.
5. If no other possible causes are remaining, fuel pump module is assumed to be defective. Replace fuel pump module.
6. Turn ignition on. Using scan tool, read 2/1 HO2S voltage. If voltage is.4-.6 volt, go to next step. If voltage is not.4-.6 volt, go to step 14.
7. Turn ignition off. Wait at least 10 minutes for HO2S to cool. Turn ignition on. Using scan tool, actuate 2/1 HO2S heater test. Using scan tool, monitor 2/1 HO2S voltage for at least 2 minutes. If voltage stays between.4 and.6 volt, replace 2/1 HO2S. If voltage does not stay between.4 and.6 volt, go to next step.
8. Start engine and warm to normal operating temperature. Ensure engine is operating in closed loop. Using scan tool, select SYSTEM TESTS, then perform PURGE VAPORS TEST. Observe SHORT TERM ADAPTIVE value on scan tool, then press "3" to flow. If SHORT TERM ADAPTIVE value changes, go to next step. If SHORT TERM ADAPTIVE value does not change, go to CHECKING EVAPORATIVE EMISSION SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.
9. Turn ignition off then on. Ensure throttle is completely closed. Using scan tool, read TP sensor voltage. If TP sensor voltage is.92 volt or less, go to next step. If voltage is more than.92 volt, check for binding throttle. Repair throttle as necessary. If throttle is not binding, replace TP sensor.
10. While monitoring TP sensor voltage on scan tool, slowly open and close throttle. If voltage increases and decreases smoothly in response to throttle opening and closing, go to next step. If voltage does not increase and decrease smoothly in response to throttle opening and closing, replace TP sensor.
11. Turn ignition off. Connect a vacuum gauge to a manifold vacuum source. Start engine and let it idle. If engine will not idle, slightly open throttle and maintain a constant RPM. Using scan tool, read MAP sensor vacuum value. If vacuum gauge reading is within one in. Hg of scan tool display, go to next step. If vacuum gauge reading is not within one in. Hg of scan tool display, replace MAP sensor.
12. Turn ignition on. Using scan tool, read ECT sensor value. If engine was allowed to sit overnight, ECT sensor value should be near ambient air temperature value. If ECT sensor value is more than 180°F (82.2°C), allow engine to cool until ECT sensor value is 150°F (65.5.°C) before proceeding. If ECT sensor value is 150°F (65.5°C) or less, start engine. Using scan tool, monitor ECT sensor value until it reaches 180°F (82.2°C). ECT sensor value should increase smoothly from start-up to normal operating temperature and should reach at least 180°F (82.2°C). If ECT sensor value increased smoothly and reached at least 180°F (82.2°C), go to next step. If ECT sensor value did not increase smoothly or did not reach at least 180°F (82.2°C), replace ECT sensor.
13. Check for any of the following conditions: Ensure air intake system is free from leaks. Ensure engine vacuum is at least 13 in. Hg at idle in Park or Neutral. Ensure valve timing is correct. Ensure engine compression is within specification. Ensure exhaust system is free from restrictions or leaks. Ensure PCV system flows freely. Ensure torque converter stall speed is within specification. Ensure power brake booster has no internal vacuum leaks. Ensure fuel is not contaminated. Ensure fuel injectors are not restricted. Ensure fuel injector harness connectors are connected to correct fuel injectors. If a problem exists, repair as necessary. If no problems exist, test is complete.
14. Disconnect 2/1 HO2S harness connector. Using scan tool, read 2/1 HO2S voltage. If voltage is.4-.6 volt, replace 2/1 HO2S. If voltage is not.4-.6 volt, go to next step.
15. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Light Green/Red wire) between 2/1 HO2S harness connector and terminal No. 29 at PCM C1 harness connector. (Scheme 4) If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Light Green/Red wire.
16. Turn ignition off. Reconnect PCM harness connectors. Start engine. Measure voltage between ground and signal circuit (Light Green/Red wire) at 2/1 HO2S harness connector. If voltage is.6 volt or less, go to next step. If voltage is more than.6 volt, repair short to voltage in Light Green/Red wire.
17. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
18. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs and note freeze frame data. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn engine off. Disconnect fuel injector No. 1 connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at fuel injector No. 1 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate or is not bright, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of fuel injector driver circuit (White/Dark Blue wire) between fuel injector No. 1 harness connector and terminal No. 13 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White/Dark Blue wire.
4. Measure resistance between ground and fuel injector driver circuit (White/Dark Blue wire) at fuel injector No. 1 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in White/Dark Blue wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace fuel injector No. 1. Attempt to operate vehicle using information noted in freeze frame data. Using scan tool, read DTCs. If DTC P0201 is displayed, replace PCM. If DTC P0201 is not displayed, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between fuel injector No. 1 harness connector terminal No. 2 (Dark Green/Light Green wire) and ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs and note freeze frame data. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn engine off. Disconnect fuel injector No. 2 connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at fuel injector No. 2 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate or is not bright, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of fuel injector driver circuit (Tan/White wire on 2.7L; Tan wire on 3.2L/3.5L) between fuel injector No. 2 harness connector and terminal No. 17 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in fuel injector driver circuit.
4. Measure resistance between ground and fuel injector driver circuit (Tan/White wire on 2.7L; Tan wire on 3.2L/3.5L) at fuel injector No. 2 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in fuel injector driver circuit.
5. Using scan tool, clear DTCs. Turn ignition off. Replace fuel injector No. 2. Attempt to operate vehicle using information noted in freeze frame data. Using scan tool, read DTCs. If DTC P0202 is displayed, replace PCM. If DTC P0202 is not displayed, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between fuel injector No. 2 harness connector terminal No. 2 (Dark Green/Light Green wire) and ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs and note freeze frame data. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn engine off. Disconnect fuel injector No. 3 connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at fuel injector No. 3 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate or is not bright, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of fuel injector driver circuit (Yellow/White wire) between fuel injector No. 3 harness connector and terminal No. 7 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Yellow/White wire.
4. Measure resistance between ground and fuel injector driver circuit (Yellow/White wire) at fuel injector No. 3 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Yellow/White wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace fuel injector No. 3. Attempt to operate vehicle using information noted in freeze frame data. Using scan tool, read DTCs. If DTC P0203 is displayed, replace PCM. If DTC P0203 is not displayed, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between fuel injector No. 3 harness connector terminal No. 2 (Dark Green/Light Green wire) and ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs and note freeze frame data. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn engine off. Disconnect fuel injector No. 4 connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at fuel injector No. 4 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate or is not bright, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of fuel injector driver circuit (Light Blue/Brown wire) between fuel injector No. 4 harness connector and terminal No. 16 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Blue/Brown wire.
4. Measure resistance between ground and fuel injector driver circuit (Light Blue/Brown wire) at fuel injector No. 4 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Light Blue/Brown wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace fuel injector No. 4. Attempt to operate vehicle using information noted in freeze frame data. Using scan tool, read DTCs. If DTC P0204 is displayed, replace PCM. If DTC P0204 is not displayed, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between fuel injector No. 4 harness connector terminal No. 2 (Dark Green/Light Green wire) and ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs and note freeze frame data. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn engine off. Disconnect fuel injector No. 5 connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at fuel injector No. 5 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate or is not bright, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of fuel injector driver circuit (Gray wire) between fuel injector No. 5 harness connector and terminal No. 15 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray wire.
4. Measure resistance between ground and fuel injector driver circuit (Gray wire) at fuel injector No. 5 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Gray wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace fuel injector No. 5. Attempt to operate vehicle using information noted in freeze frame data. Using scan tool, read DTCs. If DTC P0205 is displayed, replace PCM. If DTC P0205 is not displayed, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between fuel injector No. 5 harness connector terminal No. 2 (Dark Green/Light Green wire) and ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs and note freeze frame data. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn engine off. Disconnect fuel injector No. 6 connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at fuel injector No. 6 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate or is not bright, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of fuel injector driver circuit (Brown/Dark Blue wire) between fuel injector No. 6 harness connector and terminal No. 14 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown/Dark Blue wire.
4. Measure resistance between ground and fuel injector driver circuit (Brown/Dark Blue wire) at fuel injector No. 6 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Brown/Dark Blue wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace fuel injector No. 6. Attempt to operate vehicle using information noted in freeze frame data. Using scan tool, read DTCs. If DTC P0206 is displayed, replace PCM. If DTC P0206 is not displayed, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between fuel injector No. 6 harness connector terminal No. 2 (Dark Green/Light Green wire) and ASD relay connector terminal "D" (Dark Green/Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If MISFIRE GOOD TRIP counter is displayed and equal to zero, go to next step. If MISFIRE GOOD TRIP counter is not displayed and equal to zero, go to step 8 .
2. At this time, conditions required to set DTC are present. Using scan tool, select DTC's and RELATED FUNCTIONS. Record FREEZE FRAME DATA. Select OBD II MONITORS. Read and record MISFIRE SIMILAR CONDITIONS WINDOW DATA. Using these screens, attempt to duplicate condition(s) that set DTC. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MISFIRING screen. If scan tool is counting misfires at this time, go to next step. If scan tool is not counting misfires at this time, go to step 8 .
3. Using scan tool, read FREEZE FRAME DATA. Using this data, attempt to determine cause of misfire DTC. If ADAPTIVE FUEL PERCENTAGES in freeze frame are plus or minus 15 percent or less, go to next step. If ADAPTIVE FUEL PERCENTAGES in freeze frame are more than plus or minus 15 percent, check fuel delivery system. See FUEL SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.
4. Using scan tool, read FREEZE FRAME DATA. Using this data, attempt to determine cause of misfire DTC. If LOAD VALUE in freeze frame is 50 percent or less with engine at normal operating temperature, go to next step. If LOAD VALUE in freeze frame is more than 50 percent with engine at normal operating temperature, check secondary ignition, compression and cylinder leakage.
5. Using scan tool, read FREEZE FRAME DATA. Using this data, attempt to determine cause of misfire DTC. If ENGINE RPM in freeze frame is 3000 RPM or less with engine at normal operating temperature, go to next step. If ENGINE RPM in freeze frame is more than 3000 RPM with engine at normal operating temperature, test CMP and CKP signals with lab scope, check valve timing and perform running vacuum test.
6. Check for any of the following conditions: Ensure engine vacuum is at least 13 in. Hg with transmission in Neutral. Ensure valve timing is within specification. Ensure compression is within specification. Ensure exhaust is free from restrictions or leaks. Ensure PCV system flows freely. Ensure torque converter stall speed is within specification. Ensure power brake booster has no internal vacuum leaks. Ensure fuel is not contaminated. Ensure fuel injector is not plugged or restricted. Ensure fuel injector harness connectors are connected to correct fuel injectors. If a problem is found, repair as necessary. If no problems are found, go to next step. NOTE: Anything that affects crankshaft speed can cause a misfire DTC.
7. Check for these other possible causes of misfire: injector harness connectors, secondary ignition problem, mechanical engine problem, PCM power grounds, irregular CMP and CKP signal, plugged injectors, restricted exhaust, intake restriction, damaged trigger wheel, contaminated fuel, vacuum leak, weak valve springs, carbon deposits on valves or accessory drive belt. Check for technical service bulletins related to a misfire DTC. If a problem is found, repair as necessary. If no problems are found, test is complete. NOTE: An intermittent problem may have been caused by moisture in secondary ignition.
8. At this time, misfire does not exist or is intermittent. Using scan tool, select DTC's and RELATED FUNCTIONS. Read and record FREEZE FRAME DATA. Select OBD II MONITORS. Read and record MISFIRE SIMILAR CONDITIONS WINDOW DATA. Using these screens, attempt to duplicate condition that set misfire DTC. While using FREEZE FRAME DATA, pay particular attention to DTC setting conditions, such as SPEED, TEMP, LOAD and MAP VACUUM. If misfire reoccurs, go to next step. If misfire does not reoccur, misfire DTC conditions no longer exist. Refer to any TSBs that are related to symptom. Operate vehicle for 2 misfire good trips and clear DTCs.
9. Using scan tool, read FREEZE FRAME DATA. Using this data, attempt to determine cause of misfire DTC. If ADAPTIVE FUEL PERCENTAGES in freeze frame are plus or minus 15 percent or less, go to next step. If ADAPTIVE FUEL PERCENTAGES in freeze frame are more than plus or minus 15 percent, check fuel delivery system. See FUEL SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.
10. Using scan tool, read FREEZE FRAME DATA. Using this data, attempt to determine cause of misfire DTC. If LOAD VALUE in freeze frame is 50 percent or less with engine at normal operating temperature, go to next step. If LOAD VALUE in freeze frame is more than 50 percent with engine at normal operating temperature, check secondary ignition, compression and cylinder leakage.
11. Using scan tool, read FREEZE FRAME DATA. Using this data, attempt to determine cause of misfire DTC. If ENGINE RPM in freeze frame is 3000 RPM or less with engine at normal operating temperature, go to next step. If ENGINE RPM in freeze frame is more than 3000 RPM with engine at normal operating temperature, test CMP and CKP signals with lab scope, check valve timing and perform running vacuum test.
12. Check for any of the following conditions: Ensure engine vacuum is at least 13 in. Hg with transmission in Neutral. Ensure valve timing is within specification. Ensure compression is within specification. Ensure exhaust is free from restrictions or leaks. Ensure PCV system flows freely. Ensure torque converter stall speed is within specification. Ensure power brake booster has no internal vacuum leaks. Ensure fuel is not contaminated. Ensure fuel injector is not plugged or restricted. Ensure fuel injector harness connectors are connected to correct fuel injectors. If a problem is found, repair as necessary. If no problems are found, test is complete.

For diagnosis and repair procedure, see DTC P0300: MULTIPLE CYLINDER MISFIRE .

1. Turn ignition on. Using scan tool, select INPUTS/OUTPUTS and read CURRENT CKP STATE while cranking engine. If scan tool displays CURRENT CKP STATE PRESENT, go to next step. If scan tool does not display CURRENT CKP STATE PRESENT, go to step 6.
2. Turn ignition off. Using lab scope, backprobe CKP sensor signal circuit (Gray/Black wire) at PCM C1 connector terminal No. 32. see scheme 2and (Scheme 4). While observing lab scope screen, turn ignition on. If CKP sensor generated any pulses, replace CKP sensor. If CKP sensor did not generate any pulses, go to next step.
3. Turn ignition off. Using lab scope, backprobe CMP sensor signal circuit (Tan/Yellow wire) at PCM C1 connector terminal No. 33. While observing lab scope screen, turn ignition on. If CMP sensor generated any pulses, replace CMP sensor. If CMP sensor did not generate any pulses, go to next step.
4. Turn ignition off. Using lab scope, backprobe CKP signal circuit (Gray/Black wire) at PCM C1 connector terminal No. 32. Start engine. Observe lab scope screen while wiggling wiring harness and connectors between CKP sensor and PCM. For CKP sensor location (Scheme 8) If any irregularities in lab scope pattern are present, carefully inspect related wiring harness connectors. Repair connectors as necessary. If connectors are okay, replace CKP sensor. If no irregularities in lab scope pattern are present, go to next step.
5. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.
6. Turn ignition off. Disconnect CKP sensor harness connector. (Scheme 8) Turn ignition on. Measure voltage between ground and 5-volt to 8-volt supply circuit (Orange wire) at CKP sensor harness connector. If voltage is 7.5-8.5 volts, go to next step. If voltage is not 7.5-8.5 volts, go to step 15.
7. Measure voltage between ground and signal circuit (Gray/Black wire) at CKP sensor harness connector. If voltage is 4.5-5.0 volts, go to next step. If voltage is not 4.5-5.0 volts, go to step 10.
8. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of sensor ground circuit (Black/Light Blue wire) between CKP sensor harness connector and terminal No. 43 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
9. If no other possible causes are remaining, CKP sensor is assumed to be defective. Replace CKP sensor.
10. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Gray/Black wire) at CKP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in signal circuit. See WIRING DIAGRAMS article.
11. Measure resistance of signal circuit (Gray/Black wire) between CKP sensor harness connector and terminal No. 32 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Black wire.
12. Reconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and signal circuit (Gray/Black wire) at CKP sensor harness connector. If voltage is more than 5 volts, repair short to voltage in signal circuit. If voltage is 5 volts or less, go to next step.
13. Turn ignition off. Disconnect PCM harness connectors. Measure resistance between signal circuit (Gray/Black wire) and 5-volt to 8-volt supply circuit (Orange wire) at CKP sensor harness connector. If resistance is less than 5 ohms, repair short between signal circuit and 5-volt to 8-volt supply circuit. If resistance is 5 ohms or more, go to next step.
14. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
15. Ensure ignition is off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and 5-volt to 8-volt supply circuit (Orange wire) at CKP sensor harness connector. If resistance is 100 ohms ore more, go to next step. If resistance is less than 100 ohms, repair short to ground in 5-volt to 8-volt supply circuit. See WIRING DIAGRAMS article.
16. Measure resistance of 5-volt to 8-volt supply circuit (Orange wire) between CKP sensor harness connector and terminal No. 44 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Orange wire.
17. Reconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and 5-volt to 8-volt supply circuit (Orange wire) at CKP sensor harness connector. If voltage is 8.5 volts or less, go to next step. If voltage is 8.5 volts or more, repair short to voltage in 5-volt to 8-volt supply circuit.
18. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.

Scheme 8

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect knock sensor harness connector. Knock sensor is threaded into top cylinder block between cylinder heads. Removal of intake manifold may be necessary to access knock sensor. Measure voltage between ground and signal circuit (Black/Violet wire on 2.7L; Dark Blue/Light Green wire on 3.2L/3.5L) at knock sensor harness connector. If voltage is 2 volts or less, go to next step. If voltage is more than 2 volts, repair short to voltage in signal circuit.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Black/Violet wire on 2.7L; Dark Blue/Light Green wire on 3.2L/3.5L) at knock sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in signal circuit.
4. On 2.7L models, measure resistance of signal circuit (Black/Violet wire) between knock sensor harness connector and terminal No. 25 at PCM C1 harness connector. On 3.2L/3.5L models, measure resistance of signal circuit (Dark Blue/Light Green wire) between knock sensor harness connector and terminal No. 24 at PCM C1 harness connector. On all models, refer to illustration. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in signal circuit.
5. On 2.7L models, measure resistance between signal circuit (Black/Violet wire) and sensor ground circuit (Black/Light Blue wire) at knock sensor harness connector. On 3.2L/3.5L models, measure resistance between signal circuit (Dark Blue/Light Green wire) and sensor ground circuit (Black/Violet wire) at knock sensor harness connector. On all models, if resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
6. On 2.7L models, measure resistance of sensor ground circuit (Black/Light Blue wire) between knock sensor harness connector and terminal No. 43 at PCM C2 harness connector. On 3.2/3.5L models, measure resistance of sensor ground circuit (Black/Violet wire) between knock sensor harness connector and terminal No. 25 at PCM C1 harness connector. On all models, if resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in sensor ground circuit.
7. Replace knock sensor. Turn ignition on. Using scan tool, clear DTC. Attempt to operate vehicle using information noted in freeze frame data. Using scan tool, read DTCs. If DTC P0325 is displayed, replace PCM. If DTC P0325 is not displayed, test is complete.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, select INPUTS/OUTPUTS and read current CMP state while cranking engine. If scan tool displays current CMP state PRESENT, go to next step. If scan tool does not display current CMP state PRESENT, go to step 6.
2. Turn ignition off. Using lab scope, backprobe CKP sensor signal circuit (Gray/Black wire) at PCM C1 connector terminal No. 32. see scheme 2and (Scheme 4). While observing lab scope screen, turn ignition on. If CKP sensor generated any pulses, replace CKP sensor. If CKP sensor did not generate any pulses, go to next step.
3. Turn ignition off. Using lab scope, backprobe CMP sensor signal circuit (Tan/Yellow wire) at PCM C1 connector terminal No. 33. While observing lab scope screen, turn ignition on. If CMP sensor generated any pulses, replace CMP sensor. If CMP sensor did not generate any pulses, go to next step.
4. Turn ignition off. Using lab scope, backprobe CKP signal circuit (Gray/Black wire) at PCM C1 connector terminal No. 32. Start engine. Observe lab scope screen while wiggling wiring harness and connectors between CKP sensor and PCM. If any irregularities in lab scope pattern are present, carefully inspect related wiring harness connectors. Repair connectors as necessary. If connectors are okay, replace CKP sensor. If no irregularities in lab scope pattern are present, go to next step.
5. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.
6. Turn ignition off. Disconnect CMP sensor harness connector. (Scheme 6)or (Scheme 7). Turn ignition on. Measure voltage between ground and 5-volt to 8-volt supply circuit (Orange wire) at CMP sensor harness connector. If voltage is 7.5-8.5 volts, go to next step. If voltage is not 7.5-8.5 volts, go to step 15.
7. Measure voltage between ground and signal circuit (Tan/Yellow wire) at CMP sensor harness connector. If voltage is 4.5-5.0 volts, go to next step. If voltage is not 4.5-5.0 volts, go to step 10.
8. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of sensor ground circuit (Black/Light Blue wire) between CMP sensor harness connector and terminal No. 43 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
9. If no other possible causes are remaining, CMP sensor is assumed to be defective. Replace CMP sensor.
10. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Tan/Yellow wire) at CMP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Tan/Yellow wire.
11. Measure resistance of signal circuit (Tan/Yellow wire) between CMP sensor harness connector and terminal No. 33 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Yellow wire.
12. Reconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and signal circuit (Tan/Yellow wire) at CMP sensor harness connector. If voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, repair short to voltage in Tan/Yellow wire.
13. Turn ignition off. Disconnect PCM harness connectors. Measure resistance between signal circuit (Tan/Yellow wire) and 5-volt to 8-volt supply circuit (Orange wire) at CMP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short between signal circuit and 5-volt to 8-volt supply circuit.
14. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
15. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and 5-volt to 8-volt supply circuit (Orange wire) at CMP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in 5-volt to 8-volt supply circuit. See WIRING DIAGRAMS article.
16. Measure resistance of 5-volt to 8-volt supply circuit (Orange wire) between CMP sensor harness connector and terminal No. 44 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Orange wire.
17. Reconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and 5-volt to 8-volt supply circuit (Orange wire) at CMP sensor harness connector. If voltage is 8.5 volts or less, go to next step. If voltage is more than 8.5 volts, repair short to voltage in 5-volt to 8-volt supply circuit. See WIRING DIAGRAMS article.
18. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect ignition coil No. 1 harness connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at ignition coil No. 1 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of ignition coil driver circuit (Tan/Red wire) between ignition coil No. 1 harness connector and terminal No. 11 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Red wire.
4. Measure resistance between ground and ignition coil driver circuit (Tan/Red wire) at ignition coil No. 1 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Tan/Red wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace ignition coil No. 1 with a substitute ignition coil. Attempt to operate vehicle using information noted in freeze frame. Using scan tool, read DTCs. If scan tool displays DTC P0351, replace PCM. If scan tool does not display DTC P0351, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between ASD relay connector terminal "D" (Dark Green/Orange wire) and ignition coil No. 1 harness connector terminal No. 1 (Dark Green/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect ignition coil No. 2 harness connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at ignition coil No. 2 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of ignition coil driver circuit (Tan/Pink wire) between ignition coil No. 2 harness connector and terminal No. 3 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Pink wire.
4. Measure resistance between ground and ignition coil driver circuit (Tan/Pink wire) at ignition coil No. 2 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Tan/Pink wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace ignition coil No. 2 with a substitute ignition coil. Attempt to operate vehicle using information noted in freeze frame. Using scan tool, read DTCs. If scan tool displays DTC P0352, replace PCM. If scan tool does not display DTC P0352, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between ASD relay connector terminal "D" (Dark Green/Orange wire) and ignition coil No. 2 harness connector terminal No. 1 (Dark Green/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect ignition coil No. 3 harness connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at ignition coil No. 3 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of ignition coil driver circuit (Tan/Orange wire) between ignition coil No. 3 harness connector and terminal No. 2 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Orange wire.
4. Measure resistance between ground and ignition coil driver circuit (Tan/Orange wire) at ignition coil No. 3 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Tan/Orange wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace ignition coil No. 3 with a substitute ignition coil. Attempt to operate vehicle using information noted in freeze frame. Using scan tool, read DTCs. If scan tool displays DTC P0353, replace PCM. If scan tool does not display DTC P0353, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between ASD relay connector terminal "D" (Dark Green/Orange wire) and ignition coil No. 3 harness connector terminal No. 1 (Dark Green/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect ignition coil No. 4 harness connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at ignition coil No. 4 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of ignition coil driver circuit (Tan/Light Green wire) between ignition coil No. 4 harness connector and terminal No. 1 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Light Green wire.
4. Measure resistance between ground and ignition coil driver circuit (Tan/Light Green wire) at ignition coil No. 4 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Tan/Light Green wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace ignition coil No. 4 with a substitute ignition coil. Attempt to operate vehicle using information noted in freeze frame. Using scan tool, read DTCs. If scan tool displays DTC P0354, replace PCM. If scan tool does not display DTC P0354, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between ASD relay connector terminal "D" (Dark Green/Orange wire) and ignition coil No. 4 harness connector terminal No. 1 (Dark Green/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect ignition coil No. 5 harness connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at ignition coil No. 5 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of ignition coil driver circuit (Tan/Dark Green wire) between ignition coil No. 5 harness connector and terminal No. 21 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Dark Green wire.
4. Measure resistance between ground and ignition coil driver circuit (Tan/Dark Green wire) at ignition coil No. 5 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Tan/Dark Green wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace ignition coil No. 5 with a substitute ignition coil. Attempt to operate vehicle using information noted in freeze frame. Using scan tool, read DTCs. If scan tool displays DTC P0355, replace PCM. If scan tool does not display DTC P0355, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between ASD relay connector terminal "D" (Dark Green/Orange wire) and ignition coil No. 5 harness connector terminal No. 1 (Dark Green/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect ignition coil No. 6 harness connector. Turn ignition on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Dark Green/Light Green wire) at ignition coil No. 6 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, go to step 6.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of ignition coil driver circuit (Tan/Light Blue wire) between ignition coil No. 6 harness connector and terminal No. 4 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Light Blue wire.
4. Measure resistance between ground and ignition coil driver circuit (Tan/Light Blue wire) at ignition coil No. 6 harness connector. If resistance is 100 k/ohms or more, go to next step. If resistance is less than 100 k/ohms, repair short to ground in Tan/Light Blue wire.
5. Using scan tool, clear DTCs. Turn ignition off. Replace ignition coil No. 6 with a substitute ignition coil. Attempt to operate vehicle using information noted in freeze frame. Using scan tool, read DTCs. If scan tool displays DTC P0356, replace PCM. If scan tool does not display DTC P0356, test is complete.
6. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Measure resistance of ASD relay output circuit between ASD relay connector terminal "D" (Dark Green/Orange wire) and ignition coil No. 6 harness connector terminal No. 1 (Dark Green/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
7. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. EGR solenoid is integral to EGR valve. If EGR solenoid is defective, EGR valve must be replaced.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 13. NOTE: In the following step, if engine is running rough at idle before EGR system test actuated, go to step 3.
2. Turn ignition on. Turn all accessories off. Start engine and warm to normal operating temperature. Using scan tool, select ENGINE SYSTEM TEST, then EGR SYSTEM TEST. Select FLOW on scan tool. If engine runs rough or stalls, go to next step. If engine does not run rough or stall, go to step 8.
3. Turn ignition off. Disconnect EGR solenoid harness connector. EGR solenoid is integral to EGR valve. EGR valve is mounted to rear of right cylinder head. Start engine and let it idle. If engine does not idle rough or stall, go to next step. If engine idles rough or stalls, inspect EGR tube assembly. Repair or replace EGR tube assembly as necessary. If EGR tube assembly is okay, replace EGR valve.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and EGR solenoid control circuit (Gray/Yellow wire) at EGR solenoid harness connector terminal No. 4. (Scheme 9) If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Gray/Yellow wire.
5. Measure resistance between EGR solenoid control circuit (Gray/Yellow wire) at EGR solenoid harness connector terminal No. 4 and sensor ground circuit (Black/Light Blue wire) at EGR solenoid harness connector terminal No. 3. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short between EGR solenoid control circuit and sensor ground circuit.
6. Inspect EGR assembly for the following: Gasket(s) for leaking. Damage or holes in EGR tubes. Carbon build-up on or near EGR pintle and passage ways. Obstruction in EGR tubes. If a problem is found, repair as necessary. If no problems are found, go to next step.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Turn ignition off then on. Ensure all accessories are turned off. Disconnect EGR solenoid harness connector. Connect a test light between ASD relay output circuit (Orange/Dark Green wire) at EGR solenoid harness connector terminal No. 6 and EGR solenoid control circuit (Gray/Yellow wire)at EGR solenoid harness connector terminal No. 4. (Scheme 9) Using scan tool, actuate EGR solenoid. If test light flashes on and off, inspect EGR tubes for obstructions and damage. Repair as necessary. If EGR tubes are okay, replace EGR solenoid assembly. If test light does not flash on and off, go to next step.
9. Turn ignition off then on. Using scan tool, actuate ASD relay. Using a test light connected to ground, probe ASD relay output circuit (Orange/Dark Green wire) at EGR solenoid harness connector terminal No. 6. If test light illuminates, go to next step. If test light does not illuminate, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
10. Turn ignition off then on. Measure voltage between ground and EGR solenoid control circuit (Gray/Yellow wire) at EGR solenoid harness connector terminal No. 4. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair short to voltage in Gray/Yellow wire between PCM and EGR solenoid.
11. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of EGR solenoid control circuit (Gray/Yellow wire) between EGR solenoid harness connector terminal No. 4 and terminal No. 40 at PCM C1 harness connector. (Scheme 4)and (Scheme 9). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Yellow wire.
12. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
13. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 9

Note. EGR solenoid is integral to EGR valve. If EGR solenoid is defective, EGR valve must be replaced.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 9.
2. Turn ignition off. Disconnect EGR solenoid harness connector. EGR solenoid is integral to EGR valve. EGR valve is mounted to rear of right cylinder head. Turn ignition on. Turn all accessories off. Connect a test light between ASD relay output circuit (Orange/Dark Green wire) at terminal No. 6 and EGR solenoid control circuit (Gray/Yellow wire) at terminal No. 4 at EGR solenoid harness connector. (Scheme 9) Using scan tool, actuate EGR solenoid. If test light does not flash on and off, go to next step. If test light flashes on and off, replace EGR solenoid.
3. Ensure EGR solenoid connector is disconnected and ignition is on. Using scan tool, actuate ASD relay. Connect a test light between ground and ASD relay output circuit (Orange/Dark Green wire) at EGR solenoid harness connector terminal No. 6. If test light illuminates, go to next step. If test light does not illuminate, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
4. Turn ignition off then on. Measure voltage between ground and EGR solenoid control circuit (Gray/Yellow wire) at EGR solenoid harness connector terminal No. 4. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair short to voltage in Gray/Yellow wire between EGR solenoid and PCM.
5. Turn ignition off. Disconnect PCM harness connector. see scheme 2 Measure resistance between ground and EGR solenoid control circuit (Gray/Yellow wire) at EGR solenoid harness connector terminal No. 4. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Gray/Yellow wire.
6. Measure resistance between EGR solenoid control circuit (Gray/Yellow wire) at terminal No. 4 and sensor ground circuit (Black/Light Blue wire) at terminal No. 3 at EGR solenoid harness connector. (Scheme 9) If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short between Gray/Yellow wire and Black/Light Blue wire.
7. Measure resistance of EGR solenoid control circuit (Gray/Yellow wire) between terminal No. 4 at EGR solenoid harness connector and terminal No. 40 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gary/Yellow wire.
8. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
9. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. Closely inspect EGR tubes for obstructions, damage and holes. Also, inspect gaskets for leaks. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. If any other EGR related DTCs are present, diagnose and repair those DTCs first. EGR position sensor is integral to EGR valve. If EGR position sensor is defective, EGR valve must be replaced.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 12.
2. Start engine. Using scan tool, read EGR position sensor voltage. If voltage is less than 3.5 volts, go to next step. If voltage is 3.5-4.3 volts, go to step 6. If voltage is more than 4.3 volts, go to step 7.
3. Turn ignition on. Measure voltage drop in 5-volt supply circuit (Violet/White wire) by backprobing between terminal No. 2 at EGR solenoid harness connector and terminal No. 61 at PCM C2 harness connector. EGR solenoid is integral to EGR valve. EGR valve is mounted to rear of right cylinder head. see scheme 2, (Scheme 4) and (Scheme 9). If voltage drop is.3 volt or less, go to next step. If voltage drop is more than.3 volt, repair high resistance in Violet/White wire.
4. Measure voltage between ground and 5-volt supply circuit (Violet/White wire) at PCM C2 connector terminal No. 61 by backprobing. If voltage is more than 4.95 volts, go to next step. If voltage is 4.95 volts or less, replace PCM.
5. Turn ignition off. Disconnect EGR solenoid and PCM harness connectors. Measure resistance between ground and EGR sensor signal circuit (Light Green/Pink wire) at EGR solenoid harness connector terminal No. 1. If resistance is less than 5 ohms, repair short to ground in Light Green/Pink wire. If resistance is 5 ohms or more, replace EGR solenoid.
6. Ensure ignition is on. Using scan tool, actuate EGR solenoid. Feel EGR solenoid for operation. Using scan tool, stop actuation. If EGR solenoid operates when actuated and turns off when actuation is stopped, go to step 12. If EGR solenoid does not operate when actuated and turn off when actuation is stopped, go to «DTC P0403: EGR SOLENOID CIRCUIT»(ref-91093-S20803776742001030200000).
7. Turn ignition off. Disconnect EGR solenoid harness connector. EGR solenoid is integral to EGR valve. EGR valve is mounted to rear of right cylinder head. Turn ignition on. Measure voltage between ground and EGR sensor signal circuit (Light Green/Pink wire) at EGR solenoid harness connector terminal No. 1. (Scheme 9) If voltage is more than 4.3 volts, go to next step. If voltage is 4.3 volts or less, go to step 9.
8. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of sensor ground circuit (Black/Light Blue wire) between EGR solenoid harness connector terminal No. 3 and terminal No. 43 at PCM C2 harness connector. (Scheme 4)and (Scheme 9). If resistance is less than 5 ohms, replace EGR solenoid. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
9. Measure resistance of EGR sensor signal circuit (Light Green/Pink wire) between EGR solenoid harness connector terminal No. 1 and terminal No. 34 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Pink wire.
10. Measure resistance between ground and EGR sensor signal circuit (Light Green/Pink wire) at EGR solenoid harness connector terminal No. 1. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Light Green/Pink wire.
11. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
12. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. Closely inspect EGR tubes for obstructions, damage and holes. Also, inspect gaskets for leaks. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. EGR position sensor is integral to EGR valve. If EGR position sensor is defective, EGR valve must be replaced.

1. Turn ignition on. Using scan tool, read EGR position sensor voltage. If voltage is less than.2 volt, go to next step. If voltage is.2 volt or more, go to step 10.
2. Turn ignition off. Disconnect EGR solenoid connector. EGR solenoid is integral to EGR valve. EGR valve is mounted to rear of right cylinder head. Turn ignition on. Measure voltage between ground and 5-volt supply circuit (Violet/White wire) at EGR solenoid harness connector terminal No. 2. (Scheme 9) If voltage is 4.5-5.2 volts, go to next step. If voltage is not 4.5-5.2 volts, go to step 7.
3. Ensure ignition is on and EGR solenoid harness connector is disconnected. Using scan tool, read EGR position sensor voltage. If voltage is 4.5 volts or less, go to next step. If voltage is more than 4.5 volts, replace EGR solenoid.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and EGR sensor signal circuit (Light Green/Pink wire) at EGR solenoid harness connector terminal No. 1. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Light Green/Pink wire.
5. Measure resistance between EGR sensor signal circuit (Light Green/Pink wire) at terminal No. 1 and sensor ground circuit (Black/Light Blue wire) at terminal No. 3 at EGR solenoid harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between Light Green/Pink wire and Black/Light Blue wire.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and 5-volt supply circuit (Violet/White wire) at EGR solenoid harness connector terminal No. 2. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in 5-volt supply circuit. See WIRING DIAGRAMS article.
8. Measure resistance of 5-volt supply circuit (Violet/White wire) between terminal No. 2 at EGR solenoid harness connector and terminal No. 61 at PCM C2 harness connector. (Scheme 4)and (Scheme 9). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/White wire.
9. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM. NOTE: Engine may run rough or stall during the following step. Increase engine speed to prevent stalling.
10. Start engine. Using scan tool, select ENGINE SYSTEM TEST then EGR SYSTEM TEST. Select 4=VARIABLE function. Monitor EGR position sensor voltage while slowly pushing up arrow on scan tool. If voltage change is smooth, go to next step. If voltage change is not smooth, replace EGR solenoid.
11. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Start engine. Using scan tool, read EGR position sensor voltage. If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, go to step 8.
2. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Disconnect EGR solenoid harness connector. EGR solenoid is integral to EGR valve. EGR valve is mounted to rear of right cylinder head. Measure resistance between signal circuit (Light Green/Pink wire) at terminal No. 1 and 5-volt supply circuit (Violet/White wire) at terminal No. 2 at EGR solenoid harness connector. (Scheme 9) If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and 5-volt supply circuit.
3. Reconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and EGR sensor signal circuit (Light Green/Pink wire) at EGR solenoid harness connector terminal No. 1. If voltage is 5.2 volts or less, go to next step. If voltage is more than 5.2 volts, repair short to voltage in Light Green/Pink wire.
4. Turn ignition off. Connect a jumper wire between EGR sensor signal circuit (Light Green/Pink wire) at terminal No. 1 and sensor ground circuit (Black/Light Blue wire) at terminal No. 3 at EGR solenoid harness connector. Turn ignition on. Using scan tool, read EGR sensor voltage. If voltage is.5 volt or more, go to next step. If voltage is less than.5 volt, replace EGR solenoid assembly.
5. Turn ignition off. Remove jumper wire. Disconnect PCM harness connectors. Measure resistance of EGR sensor signal circuit (Light Green/Pink wire) between terminal No. 1 at EGR solenoid harness connector and terminal No. 34 at PCM C1 harness connector. (Scheme 4)and (Scheme 9). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Pink wire.
6. Turn ignition off. Disconnect PCM harness connectors. Measure resistance of sensor ground circuit (Black/Light Blue wire) between terminal No. 3 at EGR solenoid harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 30 ohms, go to next step. If resistance is 30 ohms or more, repair open in Black/Light Blue wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM. NOTE: Engine may run rough or stall during the following step. Increase engine speed to prevent stalling.
8. Start engine. Using scan tool, select ENGINE SYSTEM TEST then EGR SYSTEM TEST. Select 4=VARIABLE function. Monitor EGR position sensor voltage while slowly pushing up arrow on scan tool. If voltage change is smooth, go to next step. If voltage change is not smooth, replace EGR solenoid.
9. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. If a HO2S DTC is also set, diagnose HO2S DTC before proceeding.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 7 .
2. Inspect 1/1 catalytic converter for dents, holes, leaks, internal breakage or severe discoloration caused by overheating catalytic converter. If any problem is found, replace 1/1 catalytic converter. If no problems are found, go to next step.
3. Start engine. Check for exhaust leak between engine, 1/1 HO2S and 1/2 HO2S. Repair any leaks as necessary. If no leaks are found, go to next step.
4. Start engine and let it idle. Check exhaust for excessive smoke caused by an internal engine problem. If no engine mechanical problems are present, go to next step. If any engine mechanical problems are present, repair as necessary.
5. Review repair history. If downstream HO2S has been replaced without replacing upstream HO2S, replace upstream HO2S. If downstream HO2S has not been replaced recently or downstream HO2S has been replaced along with upstream HO2S, go to next step.
6. If no other possible causes are remaining, replace 1/1 catalytic converter.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Check for contaminates that may have damaged HO2S and catalytic converter such as contaminated fuel, unapproved silicone, oil and coolant. Review repair history. If downstream HO2S has been replaced without replacing upstream HO2S, replace upstream HO2S. With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. If a HO2S DTC is also set, diagnose HO2S DTC before proceeding.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 7 .
2. Inspect 2/1 catalytic converter for dents, holes, leaks, internal breakage or severe discoloration caused by overheating catalytic converter. If any problem is found, replace 2/1 catalytic converter. If no problems are found, go to next step.
3. Start engine. Check for exhaust leak between engine, 2/1 HO2S and 2/2 HO2S. Repair any leaks as necessary. If no leaks are found, go to next step.
4. Start engine and let it idle. Check exhaust for excessive smoke caused by an internal engine problem. If no engine mechanical problems are present, go to next step. If any engine mechanical problems are present, repair as necessary.
5. Review repair history. If downstream HO2S has been replaced without replacing upstream HO2S, replace upstream HO2S. If downstream HO2S has not been replaced recently or downstream HO2S has been replaced along with upstream HO2S, go to next step.
6. If no other possible causes are remaining, replace 2/1 catalytic converter.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Check for contaminates that may have damaged HO2S and catalytic converter such as contaminated fuel, unapproved silicone, oil and coolant. Review repair history. If downstream HO2S has been replaced without replacing upstream HO2S, replace upstream HO2S. With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. Proportional purge solenoid may also be referred to as EVAP purge solenoid.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect vacuum hoses from EVAP purge solenoid. (Scheme 10) Inspect hoses and EVAP purge solenoid for any signs of contamination from EVAP canister, which may indicate a faulty rollover valve. If rollover valve is faulty, replace fuel tank. If no signs of contamination are present, apply 10 in. Hg of vacuum to EVAP purge solenoid vacuum port with a hand vacuum pump. If EVAP purge solenoid holds vacuum, go to next step. If EVAP purge solenoid does not hold vacuum, replace EVAP purge solenoid.
3. With 10 in. Hg of vacuum still applied, turn ignition on and observe vacuum gauge. Using scan tool, actuate EVAP purge solenoid. If vacuum drops when EVAP purge solenoid is actuated, go to next step. If vacuum does not drop when EVAP purge solenoid is actuated, replace EVAP purge solenoid.
4. Turn ignition off. Carefully inspect EVAP purge solenoid vacuum supply hose for proper routing. See VACUUM DIAGRAMS article. Check for blockage or kink in vacuum supply hose. Also, check vacuum port on throttle body for blockage. If no problems are found, go to next step. If any problems are found, repair as necessary.
5. Visually inspect EVAP purge hose between EVAP purge solenoid and EVAP canister for physical damage. (Scheme 11) If no problems are found, go to next step. If any problems are found, repair or replace hose as necessary.
6. Visually inspect EVAP purge hose between EVAP canister and fuel tank for physical damage. If no problems are found, go to next step. If any problems are found, repair or replace hose as necessary.
7. Visually inspect EVAP canister for physical damage or evidence of fuel entering EVAP canister. If fuel has entered EVAP canister, it may indicate a defective rollover valve. If no problems are found, go to next step. If any problems are found, repair as necessary.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Wiggle EVAP purge solenoid wiring while circuit is actuated with scan tool. (Scheme 10) Listen for solenoid to stop actuating. Also, watch GOOD TRIP counter to change to zero. If solenoid stops actuating or GOOD TRIP counter changes to zero, repair wiring or connectors where wiggling caused solenoid to stop actuating or GOOD TRIP counter to change. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 10

Scheme 11

Note. A loose fuel tank cap could cause this trouble code to set. Ensure fuel tank cap is tight and in good condition.

1. Turn ignition on. Using scan tool, check for DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 4. CAUTION: When performing test procedures, keep lighted cigarettes, sparks, flames and other ignition sources away from test area.
2. To test EVAP system properly, fuel tank should have 20-80 percent of fuel capacity. Miller Evaporative System Testing Kit (6872A) and Gas Cap Adapter (8382) are used to perform evaporative system pressure test. Connect scan tool to Data Link Connector (DLC). Connect EVAP system testing kit positive lead to positive battery terminal and negative lead to negative battery terminal. Using EVAP system testing kit, and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Remove gas cap and install gas cap adapter to fuel tank. Install gas cap to gas cap adapter. Connect pressure supply hose from evaporative system testing kit to fitting on gas cap adapter. Disconnect vacuum supply hose at Leak Detection Pump (LDP). (Scheme 11) Apply a continuous vacuum supply of about 20 in. Hg to vacuum supply nipple on LDP. An A/C recovery unit works well for supplying a continuous vacuum supply. Turn ignition on. Using scan tool, select ENGINE SYSTEM TESTS, then LEAK DETECTION PUMP TEST. Read instructions on scan tool and then press ENTER. Select #3 HOLD PSI. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN position and set VENT valve to CLOSED position. While monitoring EVAP system testing kit pressure gauge, turn EVAP system testing kit pump timer on. When pressure gauge reaches 14 in. H2O, turn PRESSURE HOLD valve to CLOSED position. Turn timer off. Note time and pressure. If pressure drops more than 6 in. H2O in 2 minutes, go to next step. If pressure drops 6 in. H2O or less in 2 minutes, go to step 4. NOTE: A thorough visual inspection of EVAP system hoses, tubes and connections may save diagnostic time. Look for any physical damage or signs of wetness at connections.
3. EVAP system pressure pump self-test should still be running. If scan tool has timed out, restart EVAP system pressure pump self-test. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN position. Set VENT valve to CLOSED position. Turn EVAP system testing kit pump timer on. To prevent noise from interfering with test, move EVAP system kit pressure gauge away from vehicle. Using Ultrasonic Leak Detector (6904A), check for leaks at all EVAP system hoses and connections. Repair or replace leaking component(s) as necessary. If no leaks exist, no problem is indicated at this time. Test is complete.
4. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Using scan tool, review FREEZE FRAME data. Attempt to duplicate condition that caused DTC to set. Thoroughly perform a visual inspection of EVAP system hoses, tubes and connections. Look for any physical damage or signs of wetness at connections. Visually inspect related connectors and wiring harness for damage. Check for any related technical service bulletins that may apply. Turn ignition on. Using scan tool in SYSTEM TESTS, perform LDP monitor test. This will force the PCM to run LDP monitor. If monitor fails, further diagnosis is required to find faulty component. If monitor passes, no problem is indicated at this time. Test is complete.

Note. Proportional purge solenoid may also be referred to as EVAP purge solenoid.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 10.
2. Turn ignition off. Disconnect EVAP purge solenoid and PCM harness connectors. see scheme 2and (Scheme 10). Measure resistance of control circuit (Pink/Black wire) between EVAP purge solenoid harness connector and terminal No. 68 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Pink/Black wire.
3. Measure resistance between ground and control circuit (Pink/Black wire) at EVAP purge solenoid harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Pink/Black wire.
4. Measure resistance of sense circuit (Dark Green/Light Green wire) between EVAP purge solenoid harness connector and terminal No. 70 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green/Light Green wire.
5. Measure resistance between ground and sense circuit (Dark Green/Light Green wire) at EVAP purge solenoid harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Green/Light Green wire.
6. Measure resistance between EVAP purge solenoid terminals (component side). If resistance is 10-15 ohms, go to next step. If resistance is not 10-15 ohms, replace EVAP purge solenoid.
7. Disconnect hoses from EVAP purge solenoid. Using a hand vacuum pump, apply 10 in. Hg of vacuum to EVAP purge solenoid vacuum hose port. If EVAP purge solenoid holds vacuum, go to next step. If EVAP purge solenoid does not hold vacuum, replace EVAP purge solenoid.
8. Reconnect all harness connectors. Ensure 10 in. Hg of vacuum is still applied to EVAP purge solenoid. Turn ignition on. Using scan tool, actuate EVAP purge solenoid. If vacuum drops when EVAP purge solenoid is actuated, go to next step. If vacuum does not drop when EVAP purge solenoid is actuated, replace EVAP purge solenoid.
9. If no other possible causes are remaining, replace PCM.
10. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Wiggle EVAP purge solenoid wiring while circuit is actuated with scan tool. Listen for solenoid to stop actuating. Also, watch GOOD TRIP counter to change to zero. If solenoid stops actuating or GOOD TRIP counter changes to zero, repair wiring or connectors where wiggling caused solenoid to stop actuating or GOOD TRIP counter to change. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. If DTC P0462 or P0463 is also present, diagnose those DTCs first.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Visually inspect fuel tank for damage that may restrict fuel level sensor float from moving. If fuel tank is okay, go to next step. If fuel tank is not okay, replace fuel tank.
3. Turn ignition off. Disconnect fuel pump module harness connector. (Scheme 11) Disconnect Body Control Module (BCM) harness connector located on back side of junction block. Junction block is located on left end of instrument panel. Measure resistance between ground and signal circuit (Dark Blue wire) at fuel pump module harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Dark Blue wire.
4. Measure resistance of signal circuit (Dark Blue wire) between fuel pump module harness connector and terminal No. 7 at BCM C4 harness connector. (Scheme 12) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue wire.
5. Measure resistance between ground and Black wire at fuel pump module harness connector terminal No. 2. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit. WARNING: Fuel system is under constant pressure even when ignition is off. Open fuel system with caution.
6. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-91093-S02336376282001030200000). Remove fuel tank. Remove fuel pump module. Visually inspect inside of fuel tank for obstructions or deformities. Also, inspect fuel level sensor float arm for damage. If any problems are found, repair as necessary. If no problems are found, go to next step.
7. If no other possible causes are remaining, replace fuel level sensor.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 12

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, identify fault symptom and perform appropriate test. See INSTRUMENT CLUSTER SYSTEMS under SYSTEM TESTS in BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT. If GOOD TRIP counter is not displayed and equal to zero, go to next step.
2. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Visually inspect fuel tank for physical damage. With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 7.
2. Turn ignition off. Disconnect TCM harness connector. see scheme 2 Turn ignition on. Measure voltage between ground and VSS signal circuit (White/Orange wire) at terminal No. 58 at TCM harness connector. (Scheme 13) If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair short to voltage in White/Orange wire between PCM and TCM.
3. Turn ignition off. Connect one end of a jumper wire to VSS signal circuit (White/Orange wire) at terminal No. 58 at TCM harness connector. Turn ignition on. Using scan tool, read PCM Vehicle Speed Sensor (VSS) signal. While observing scan tool, rapidly tap other end of jumper wire to ground. If VSS signal is more than zero MPH, go to next step. If VSS signal is not more than zero MPH, replace TCM. Perform transaxle quick learn and pinion factor procedures. See «PROGRAMMING»(ref-91093-S41080259492001030200000).
4. Turn ignition off. Remove jumper wire. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and VSS signal circuit (White/Orange wire) at terminal No. 66 at PCM C2 harness connector. (Scheme 4) If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in White/Orange wire between PCM and TCM.
5. Measure resistance of VSS signal circuit (White/Orange wire) between terminal No. 66 at PCM C2 harness connector and No. 58 at TCM harness connector. (Scheme 13) If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in White/Orange wire.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 13

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition off. Disconnect IAC motor harness connector located on side of throttle body, below Throttle Position (TP) sensor. Disconnect PCM harness connectors. see scheme 2 Measure resistance between IAC driver circuit No. 1 (Gray/Red wire) each of the remaining driver circuits at IAC motor harness connector. (Scheme 14) If resistance is 5 ohms or more between all driver circuits, go to next step. If resistance is less than 5 ohms between any driver circuits, repair short between driver circuits.
3. Measure resistance between IAC driver circuit No. 2 (Yellow/Black wire) and driver circuits No. 3 (Brown/White wire) then No. 4 (Violet/Black wire) at IAC motor harness connector. If resistance is 5 ohms or more between all driver circuits, go to next step. If resistance is less than 5 ohms between any driver circuits, repair short between driver circuits.
4. Measure resistance between IAC driver circuit No. 3 (Brown/White wire) and No. 4 (Violet/Black wire) at IAC motor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short between driver circuits.
5. Remove Auto Shutdown (ASD) relay from Power Distribution Center (PDC). see scheme 2and see scheme 3. Connect a fused jumper wire between ASD relay harness connector terminals "B" (Red/White wire) and "D" (Dark Green/Orange wire). Turn ignition on. Measure voltage between ground and each driver circuit at IAC motor harness connector. If voltage is one volt or less on all driver circuits, go to next step. If voltage is more than one volt on any driver circuit, repair short to voltage on driver circuit(s).
6. Turn ignition off. Remove jumper wire. Measure resistance between ground and each driver circuit at IAC motor harness connector. If resistance is 5 ohms or more on all driver circuits, go to next step. If resistance is less than 5 ohms on any driver circuit, repair short to ground on driver circuit.
7. Reconnect PCM harness connectors. Reinstall ASD relay in PDC. Start engine and let it idle. Connect a test light between ground and each driver circuit at IAC motor harness connector for 10 seconds. If test light turns on and off on each driver circuit, replace IAC motor. If test light does not turn on and off on each driver circuit, replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 14

If PCM is reporting internal errors, replace PCM.

1. Turn ignition on. Using scan tool, actuate generator field driver circuit. Using a test light connected to ground, backprobe generator field driver circuit (Dark Green wire) at generator 2-pin connector. If test light illuminates brightly and flashes, go to next step. If test light does not illuminate brightly and flash, go to step 4.
2. Using scan tool, erase DTCs. Wiggle wiring harness from generator to PCM. Using scan tool, read DTCs with actuator test still running. If generator field driver circuit failure returns and DTC P0622 resets, repair wiring harness as necessary where wiggling caused problem to appear. If DTC P0622 does not reset, go to next step.
3. At this time, conditions required to set DTC are not present. Turn ignition off. Visually inspect related connectors, hoses and wiring harness for damage. Repair connectors, hoses and wiring harness as necessary. If connectors, hoses and wiring harness are okay, test is complete. NOTE: Before proceeding, carefully inspect all harness connectors for corrosion or loose terminals.
4. Turn ignition off. Disconnect generator 2-pin connector. Turn ignition on. Using scan tool, actuate generator field driver circuit. Connect a test light between ground and ASD relay output circuit (Orange/Dark Green wire) at generator 2-pin harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or short in ASD relay output circuit.
5. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and generator field driver circuit (Dark Green wire) at terminal No. 8 at PCM C1 harness connector. (Scheme 4) If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Green wire.
6. Measure resistance of generator field driver circuit (Dark Green wire) between generator 2-pin harness connector and terminal No. 8 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green wire.
7. Measure resistance between generator field terminals on back of generator. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair or replace generator.
8. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.

1. Turn ignition on. Using scan tool, actuate A/C clutch relay. Locate A/C clutch relay in Power Distribution Center (PDC). (Scheme 15) If A/C clutch relay is clicking, go to next step. If A/C clutch relay is not clicking, go to step 4.
2. Wiggle wiring harness between A/C clutch relay and PCM while relay is being actuated. If A/C clutch relay stops clicking when wiring harness is being wiggled, repair wiring where wiggling caused A/C clutch relay to stop clicking. If A/C clutch relay does not stop clicking when wiring harness is being wiggled, go to next step.
3. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.
4. Turn ignition off. Remove A/C clutch relay from PDC. Turn ignition on. Measure voltage between ground and fused ignition switch output circuit (Light Green/Black wire) at A/C clutch relay harness connector terminal "A". (Scheme 15) If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open in fused ignition switch output circuit. See WIRING DIAGRAMS article.
5. Measure resistance of A/C clutch relay coil between A/C clutch relay terminals "A" and "C". (Scheme 16) If resistance is 60-80 ohms, go to next step. If resistance is not 60-80 ohms, replace A/C clutch relay.
6. Ensure ignition is off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of A/C clutch relay control circuit (Dark Blue/Orange wire) between A/C clutch relay harness connector terminal "C" and terminal No. 64 at PCM C2 harness connector. (Scheme 4)and (Scheme 15). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Orange wire.
7. Measure resistance between ground and A/C clutch relay control circuit (Dark Blue/Orange wire) at A/C clutch relay harness connector terminal "C". If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Orange wire between A/C clutch relay and PCM.
8. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.

Scheme 15

Scheme 16

Turn ignition on. Using scan tool, read DTCs. If DTC P0700: EATX CONTROLLER DTC PRESENT is set, this DTC indicates a transmission DTC has previously been set. A DTC may not currently be present in TCM if a transmission repair was performed. If after reading transmission DTCs there are no DTCs in TCM, this DTC may be erased from PCM. If a TCM DTC is present, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS. If no TCM DTCs are present, no problem is indicated at this time. Test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 9. NOTE: Power for brake switch sense circuit comes from Brake Transmission Shift Interlock (BTSI) solenoid, and fuse No. 14 (10-amp) in junction block.
2. Turn ignition off. Disconnect brakelight switch harness connector located above brake pedal. Connect a test light between ground and brake switch sense circuit (White/Pink wire) at brakelight switch harness connector terminal No. 1. (Scheme 17) If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or short in fused ignition switch output circuit between brakelight switch and BTSI solenoid. BTSI solenoid is located on steering column.
3. Disconnect PCM harness connectors. see scheme 2 Remove Auto Shutdown (ASD) relay from Power Distribution Center (PDC). see scheme 3 Connect a jumper wire between fused battery voltage circuit (Red/White wire) at terminal "B" and ASD relay output circuit (Dark Green/Orange wire) at terminal "D" at ASD relay harness connector. Turn ignition on. Measure voltage between ground and brake switch sense circuit (White/Pink wire) at brakelight switch harness connector terminal No. 1. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair short to voltage in White/Pink wire.
4. Turn ignition off. Remove jumper wire. Measure resistance between ground and brake switch sense circuit (White/Pink wire) at brakelight switch harness connector terminal No. 1. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in White/Pink wire.
5. Measure resistance of brake switch sense circuit (White/Pink wire) between brakelight switch harness connector terminal No. 1 and terminal No. 62 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White/Pink wire.
6. Measure resistance of ground circuit (Black/Light Green wire) between terminal No. 2 at brakelight switch harness connector and ground located under center of instrument panel. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit.
7. Measure resistance between brakelight switch terminals No. 1 and 2 (component side). With brake pedal released, resistance should be less than 5 ohms. With brake pedal applied, resistance should be 5 ohms or more. If resistance is as specified, go to next step. If resistance is not as specified, replace brakelight switch.
8. If no other possible causes are remaining, replace PCM.
9. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 17

Note. Check for contaminates that may have damaged 1/1 HO2S such as contaminated fuel, unapproved silicone, oil or coolant. 1/1 HO2S may also be referred to as an upstream oxygen sensor. 1/1 HO2S is located in outlet flange of right exhaust manifold. 1/1 catalytic converter is located in right exhaust pipe.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 6.
2. Start engine and let it idle. Check exhaust system for leaks between engine and 1/1 catalytic converter. Repair exhaust system as necessary. If exhaust system is okay, go to next step.
3. Measure voltage drop in 1/1 HO2S signal circuit (Black/Dark Green wire) by backprobing between 1/1 HO2S connector and terminal No. 30 at PCM C1 connector. see scheme 2and (Scheme 4). If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in Black/Dark Green wire.
4. Measure voltage drop in sensor ground circuit (Black/Orange wire) by backprobing between 1/1 HO2S connector and terminal No. 27 at PCM C1 connector. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in Black/Orange wire.
5. If no other possible causes are remaining, replace 1/1 HO2S.
6. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Check for contaminates that may have damaged 1/1 HO2S such as contaminated fuel, unapproved silicone, oil or coolant. With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. Check for contaminates that may have damaged 2/1 HO2S such as contaminated fuel, unapproved silicone, oil or coolant. 2/1 HO2S may also be referred to as an upstream oxygen sensor. 1/1 HO2S is located in outlet flange of left exhaust manifold. 2/1 catalytic converter is located in left exhaust pipe.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 6.
2. Start engine and let it idle. Check exhaust system for leaks between engine and 2/1 catalytic converter. Repair exhaust system as necessary. If exhaust system is okay, go to next step.
3. Measure voltage drop in 2/1 HO2S signal circuit (Light Green/Red wire) by backprobing between 2/1 HO2S connector and terminal No. 29 at PCM C1 connector. see scheme 2and (Scheme 4). If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in Light Green/Red wire.
4. Measure voltage drop in sensor ground circuit (Black/Orange wire) by backprobing between 2/1 HO2S connector and terminal No. 27 at PCM C1 connector. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in Black/Orange wire.
5. If no other possible causes are remaining, replace 2/1 HO2S.
6. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Check for contaminates that may have damaged 2/1 HO2S such as contaminated fuel, unapproved silicone, oil or coolant. With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. To diagnose this DTC, manufacturer recommends allowing vehicle to sit overnight in order to have a totally cold engine. Extremely cold ambient outside temperatures may have caused this DTC to set. Before proceeding, ensure Engine Coolant Temperature (ECT) sensor is operating correctly.

Check coolant level. Add coolant if necessary. Start engine. Using scan tool, monitor engine coolant temperature during warm up cycle. If coolant temperature increases smoothly and reaches a minimum of 160°F (71°C), test is complete. If coolant temperature does not increase smoothly and reach a minimum of 160°F (71°C), repair cooling system as necessary. The most probable cause is a defective thermostat. Also, check for related technical service bulletins.

1. Turn ignition on. Using scan tool, actuate fuel pump relay. Fuel pump relay is located in Power Distribution Center (PDC). PDC is located on left side of engine compartment. see scheme 2 If fuel pump relay clicks, go to next step. If fuel pump relay does not click, go to step 4.
2. Ensure ignition is on. Wiggle wiring harness from fuel pump relay to Powertrain Control Module (PCM) while actuating fuel pump relay. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). see scheme 2 If fuel pump relay stops clicking at any time while wiggling wiring harness, repair wiring harness where wiggling caused fuel pump relay to stop clicking. If fuel pump relay does not stop clicking at any time while wiggling wiring harness, go to next step.
3. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.
4. Turn ignition off. Remove fuel pump relay from PDC. Turn ignition on. Measure voltage between ground and terminal "A" (Dark Blue/White wire) at fuel pump relay harness connector. (Scheme 18) If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open or short in fused ignition switch output circuit. See WIRING DIAGRAMS article.
5. Turn ignition off. Measure resistance between terminals "A" and "C" at fuel pump relay. (Scheme 16) If resistance is 70-90 ohms, go to next step. If resistance is not 70-90 ohms, replace fuel pump relay.
6. Ensure ignition is off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of fuel pump relay control circuit (Brown wire) between terminal "C" at fuel pump relay harness connector and terminal No. 74 at PCM C2 harness connector. (Scheme 4)and (Scheme 18). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown wire.
7. Measure resistance between ground and terminal "C" (Brown wire) at fuel pump relay harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Brown wire.
8. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.

Scheme 18

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 8.
2. Turn ignition on. Disconnect SRV solenoid harness connector. SRV solenoid is located at right rear of engine compartment and has a 2-pin connector with a Orange/Dark Green wire and Gray/Pink wire. Turn ignition on. Connect a test light between SRV solenoid harness connector terminals. Using scan tool, actuate SRV solenoid and observe test light. If test light does not flash on and off, go to next step. If test light flashes on and off, replace SRV solenoid.
3. Connect test light between ground and ASD relay output circuit (Orange/Dark Green wire) at SRV solenoid harness connector. Using scan tool, actuate SRV solenoid. If test light illuminates, go to next step. If test light does not illuminate, repair open or short in ASD relay output circuit. See WIRING DIAGRAMS article.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between SRV solenoid harness connector terminals. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short between ASD relay output circuit and SRV solenoid control circuit. See WIRING DIAGRAMS article.
5. Ensure ignition is off. Measure resistance between ground and SRV solenoid control circuit (Gray/Pink wire) at SRV solenoid harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Gray/Pink wire.
6. Measure resistance of SRV solenoid control circuit (Gray/Pink wire) between SRV solenoid harness connector and terminal No. 18 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Pink wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. Manifold tune valve solenoid may also be referred to as manifold tune valve.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 10.
2. Turn ignition off. Disconnect MTV harness connector. MTV is located in front of intake manifold. Turn ignition on. Connect a test light between MTV solenoid harness connector terminals. Using scan tool, actuate MTV solenoid. If test light does not flash on and off, go to next step. If test light flashes on and off, replace MTV solenoid.
3. Connect test light between ground and ASD relay output circuit (Dark Green/Light Green wire) at MTV solenoid harness connector. Using scan tool, actuate MTV solenoid. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, go to step 8.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between MTV solenoid harness connector terminals. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short between ASD relay output circuit and MTV solenoid control circuit. See WIRING DIAGRAMS article.
5. Measure resistance between ground and MTV solenoid control circuit (Violet/Red wire) at MTV solenoid harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Violet/Red wire.
6. Measure resistance of MTV solenoid control circuit (Violet/Red wire) between MTV solenoid harness connector and terminal No. 39 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/Red wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Turn ignition off. Remove ASD relay from PDC. (Scheme 19) Measure resistance of ASD relay output circuit between Dark Green/Light Green wire at MTV solenoid harness connector and terminal "D" (Dark Green/Orange wire) at ASD relay harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ASD relay output circuit. See WIRING DIAGRAMS article.
9. Disconnect one of the capacitor harness connectors. Capacitors are located on side of each valve cover. Install a good fuse "S" (20-amp) in PDC. Using scan tool, actuate ASD relay. Repeat test for other capacitor. If fuse "S" blows for both capacitor tests, repair short to ground in ASD relay output circuit. If fuse "S" does not blow with capacitor disconnected, but blows with capacitor connected, replace shorted capacitor.
10. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 19

Note. Fixed Orifice Adapter (6457) is needed to perform the following test.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 10.
2. Start engine and let it idle for 60 seconds. Using scan tool, select SYSTEMS TEST, then IAC WIGGLE TEST. Idle speed should increase and decrease with scan tool display. If idle speed increases and decreases correctly, go to next step. If idle speed does not increase and decrease correctly, go to step 6.
3. Check vacuum hoses for leaks. Check for internal engine vacuum leaks. If no leaks are found, go to next step. If any leaks are found, repair as necessary.
4. Check air intake system for restrictions or leaks. If no problems are found, go to next step. If any problems are found, repair as necessary.
5. Inspect throttle plate for carbon build-up or other restrictions. Inspect throttle linkage for binding. Ensure throttle plate is touching throttle stop at idle. If no problems are found, go to next step. If any problems are found, repair as necessary.
6. Turn ignition off. Disconnect IAC motor harness connector located on side of throttle body, below TP sensor. Start engine and let it idle. Using a test light connected to ground, probe each IAC motor harness connector terminal for 10 seconds. If test light flashes while probing each IAC driver circuit, go to next step. If test light does not flash while probing each IAC driver circuit, go to step 8.
7. Using a test light connected to battery positive, probe each IAC motor harness connector terminal for 10 seconds. If test light flashes while probing each IAC driver circuit, replace IAC motor. If test light does not flash while probing each IAC driver circuit, replace PCM.
8. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of IAC driver circuit between IAC motor harness connector and PCM C2 harness connector that indicated no test light flashing. See WIRING DIAGRAMS article. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in appropriate IAC driver circuit.
9. If no other possible causes are remaining, replace PCM.
10. Start engine and let it idle for 60 seconds. Using scan tool, select SYSTEMS TEST, then IAC WIGGLE TEST. Idle speed should increase and decrease with scan tool display. If idle speed increases and decreases correctly, go to next step. If idle speed does not increase and decrease correctly, check IAC motor. See IDLE CONTROL SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.
11. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Ensure throttle linkage operates smoothly. Ensure throttle plate is fully closed at idle. With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 14.
2. Using scan tool, read MAP sensor voltage. If voltage is less than 3.19 volts, go to next step. If voltage is 3.19 volts or more, go to step 11.
3. Turn ignition off. Disconnect MAP sensor harness connector. (Scheme 2)or (Scheme 3). Turn ignition on. Measure voltage between ground and 5-volt supply circuit (Violet/White wire) at MAP sensor harness connector. If voltage is 4.5-5.2 volts, go to next step. If voltage is not 4.5-5.2 volts, go to step 8.
4. Ensure MAP sensor harness connector is disconnected. Using scan tool, read MAP sensor voltage. If voltage is 1.2 volts or less, go to next step. If voltage is more than 1.2 volts, replace MAP sensor.
5. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Dark Green/Red wire) at MAP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Dark Green/Red wire.
6. Measure resistance between signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire) at MAP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
7. If no other possible causes are remaining, replace PCM.
8. Turn ignition off. Disconnect PCM harness connector. see scheme 2 Measure resistance between ground and 5-volt supply circuit (Violet/White wire) at MAP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Violet/White wire.
9. Measure resistance of 5-volt supply circuit (Violet/White wire) between MAP sensor harness connector and terminal No. 61 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in 5-volt supply circuit.
10. If no other possible causes are remaining, replace PCM.
11. Turn ignition off. Measure resistance of 5-volt supply circuit (Violet/White wire) between MAP sensor harness connector and terminal No. 61 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in 5-volt supply circuit.
12. Remove MAP sensor. Inspect MAP sensor vacuum port for restrictions. If no restrictions or foreign material is found, go to next step. If any restrictions or foreign material is found, repair as necessary.
13. If no other possible causes are remaining, replace MAP sensor.
14. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Inspect intake manifold and power brake booster for vacuum leaks. Check Positive Crankcase Ventilation (PCV) for proper operation and vacuum leaks. Repair as necessary. If no vacuum leaks are found and PCV system functions properly, go to next step.
2. Turn ignition on. Using scan tool, monitor TP sensor voltage. Slowly open throttle from idle to wide open throttle. If voltage is about .8 volt at idle and more than 3.5 volts at wide open throttle, go to next step. If voltage is not about .8 volt at idle and more than 3.5 volts at wide open throttle, replace TP sensor.
3. Ensure throttle is fully closed and resting on throttle stop. Using scan tool, read TP sensor voltage. If voltage is less than 1.5 volts, go to next step. If voltage is 1.5 volts or more, replace TP sensor.
4. Turn ignition off. Connect a vacuum gauge to manifold vacuum. Start engine and warm to normal operating temperature. If engine will not idle, maintain a constant RPM. Using scan tool, read MAP sensor vacuum value. If scan tool reading is within one in. Hg of vacuum gauge reading, test is complete. If scan tool reading is not within one in. Hg of vacuum gauge reading, replace MAP sensor.

1. Turn ignition on. Using scan tool, actuate ASD relay. Listen for clicking sound at ASD relay. ASD relay is located in Power Distribution Center (PDC) in engine compartment. (Scheme 19) If ASD relay is clicking, go to next step. If ASD relay is not clicking, go to step 4.
2. Wiggle wiring harness between ASD relay and PCM while relay is being actuated. If ASD relay does not stop clicking while wiggling wiring harness, go to next step. If ASD relay stops clicking while wiggling wiring harness, repair wiring where wiggling caused clicking to stop.
3. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.
4. Turn ignition off. Remove ASD relay from PDC. Turn ignition on. Measure voltage between ground and fused battery voltage circuit (Red/White wire) at ASD relay harness connector terminal "A". (Scheme 19) If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair fused battery voltage circuit. See WIRING DIAGRAMS article.
5. Measure resistance between terminals "A" and "C" at ASD relay. (Scheme 20) If resistance is 60-80 ohms, go to next step. If resistance is not 60-80 ohms, replace ASD relay.
6. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of ASD relay control circuit (Dark Blue/Yellow wire) between terminal "C" at ASD relay harness connector and terminal No. 67 at PCM C2 harness connector. (Scheme 4)and (Scheme 19). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Yellow wire.
7. Measure resistance between ground and ASD relay control circuit (Dark Blue/Yellow wire) at terminal "C" at ASD relay harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Yellow wire.
8. If no other possible causes are remaining, replace PCM.

Scheme 20

Note. If DTC P1388 is also present, perform diagnosis for DTC P1388 first. See DTC P1388: AUTO SHUTDOWN RELAY CONTROL CIRCUIT .

1. Using scan tool, erase DTCs. Attempt to start engine. If engine will not start, crank engine for at least 15 seconds. It may be necessary to repeat several times. Recheck for DTCs. If DTC resets, go to next step. If DTC does not reset, go to step 9.
2. If engine started in previous step, go to next step. If engine did not start in previous step, go to step 5.
3. Turn ignition off. Remove ASD relay from Power Distribution Center (PDC). Disconnect PCM harness connectors. see scheme 2 Measure resistance of ASD relay output circuit (Dark Green/Orange wire) between terminal "D" at ASD relay harness connector and terminal No. 6 at PCM C1 harness connector. (Scheme 4)and (Scheme 19). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green/Orange wire.
4. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
5. Turn ignition off. Install a substitute relay in place of ASD relay. Attempt to start engine. Using scan tool, read DTCs. If DTC resets, go to next step. If DTC does not reset, replace ASD relay.
6. Turn ignition off. Remove ASD relay from PDC. Measure voltage between ground and fused battery voltage circuit (Red/White wire) at terminal "B" at ASD relay harness connector. If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open or short in fused battery voltage circuit. See WIRING DIAGRAMS article.
7. Ensure ignition is off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of ASD relay output circuit (Dark Green/Orange wire) between terminal "D" at ASD relay harness connector and terminal No. 6 at PCM C1 harness connector. (Scheme 4)and (Scheme 19). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green/Orange wire.
8. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
9. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. CMP or CKP sensor signal loss can be detected by an RPM change, DTC or by observing oscilloscope pattern. Refer to manufacturer's operation manual for instructions in use of oscilloscope and procedure for pattern analysis.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 10.
2. Turn ignition off. Ensure CMP sensor connector is connected. (Scheme 6)or (Scheme 7). Using oscilloscope connected to ground, backprobe CMP sensor signal circuit (Tan/Yellow wire) at CMP sensor connector. Start engine and observe oscilloscope pattern. If CMP sensor signal pattern is not consistent, go to next step. If CMP sensor signal pattern is consistent, go to step 6.
3. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. Ensure CMP sensor and/or CKP sensor mounting bolts are tight. Check for any technical service bulletins that may apply. If no problems are found, go to next step.
4. Ensure ignition is off. Remove CMP sensor. Inspect tone wheel/pulse ring for damage or looseness. Repair or replace tone wheel/pulse ring as necessary. If tone wheel/pulse ring is okay, go to next step.
5. If no other possible causes are remaining, CMP sensor is assumed to be defective. Replace CMP sensor.
6. Turn ignition off. Ensure CKP sensor connector is still connected. (Scheme 8) Using oscilloscope connected to ground, backprobe CKP sensor signal circuit (Gray/Black wire) at CKP sensor connector. Start engine and observe oscilloscope pattern. If CKP sensor signal pattern is not consistent, go to next step. If CKP sensor signal pattern is consistent, go to step 10.
7. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. Ensure CMP sensor and/or CKP sensor mounting bolts are tight. Check for any technical service bulletins that may apply. If no problems are found, go to next step.
8. Remove CKP sensor. Inspect tone wheel/flexplate for damage, foreign material or excessive movement. Repair or replace tone wheel/flexplate as necessary. If tone wheel/flexplate is okay, go to next step.
9. If no other possible causes are remaining, CKP sensor is assumed to be defective. Replace CKP sensor.
10. Turn ignition off. Using oscilloscope connected to ground, backprobe CKP signal circuit (Gray/Black wire) at terminal No. 32 at PCM C1 connector. see scheme 2and (Scheme 4). Turn ignition on and observe oscilloscope pattern. If CKP sensor did not generate any pulses, go to next step. If CKP sensor generated any pulses, replace CKP sensor.
11. Turn ignition off. Using oscilloscope connected to ground, backprobe CMP signal circuit (Tan/Yellow wire) at terminal No. 33 at PCM C1 connector. Turn ignition on and observe oscilloscope pattern. If CMP sensor did not generate any pulses, go to next step. If CMP sensor generated any pulses, replace CMP sensor.
12. Turn ignition off. Using oscilloscope connected to ground, backprobe CKP signal circuit (Gray/Black wire) at terminal No. 32 at PCM C1 connector. Start engine. Observe oscilloscope pattern while wiggling related wiring harness and connectors. If no irregularities in oscilloscope pattern exist, go to next step. If any irregularities in oscilloscope pattern exist, carefully inspect harness connectors. Repair connectors as necessary. If connectors are okay, replace CKP sensor.
13. Turn ignition off. Using oscilloscope connected to ground, backprobe CMP signal circuit (Tan/Yellow wire) at terminal No. 33 at PCM C1 connector. Start engine. Observe oscilloscope pattern while wiggling related wiring harness and connectors. If no irregularities in oscilloscope pattern exist, go to next step. If any irregularities in oscilloscope pattern exist, carefully inspect harness connectors. Repair connectors as necessary. If connectors are okay, replace CMP sensor.
14. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. Check for any technical service bulletins that may apply to this DTC.

1. Turn ignition on. Using scan tool, select MISCELLANEOUS MENU, then CLEAR PCM BATTERY DISCONNECT to reset PCM. Select MISFIRE PRETEST. Road test vehicle to relearn adaptive numerator. Adaptive numerator is learned when ADAPTIVE NUMERATOR DONE LEARNING line on scan tool screen changes to YES. If adaptive numerator relearned, go to next step. If adaptive numerator did not relearn, go to step 3.
2. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.
3. Visually inspect CKP sensor wiring harness. Check for chafed, pierced, pinched or partially broken wires. (Scheme 8) Visually inspect CKP sensor harness connector for broken, bent, pushed out or corroded terminals. Ensure CKP sensor is properly installed and mounting bolts are tight. Refer to any technical service bulletins that may apply. If any problems are found, repair as necessary. If no problems are found, go to next step.
4. Turn ignition off. Remove CKP sensor. Inspect tone wheel/flex plate slots for damage, foreign material or excessive movement. If any problems are found, repair or replace tone wheel/flex plate as necessary. If no problems are found, go to next step.
5. If no other possible causes are remaining, replace CKP sensor.

Note. If DTC P1492 or P1493 are also present, perform diagnosis for those DTCs first.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 7.
2. Turn ignition off. Disconnect ambient temperature sensor harness connector. (Scheme 21) Turn ignition on. Using scan tool, read ambient temperature sensor voltage. If voltage is more than 4.6 volts, go to next step. If voltage is 4.6 volts or less, go to step 4.
3. Turn ignition off. Connect a jumper wire between ambient temperature sensor harness connector terminals. Turn ignition on. Using scan tool, read ambient temperature sensor voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace ambient temperature sensor.
4. Reconnect ambient temperature sensor harness connector. Start engine and let it idle. Measure voltage drop in sensor ground circuit (Black/Light Blue wire) by backprobing between ambient temperature sensor connector and terminal No. 43 at PCM C2 connector. see scheme 2and (Scheme 4). If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in sensor ground circuit.
5. With engine idling, measure voltage drop in ambient temperature sensor signal circuit (Violet/Light Green wire) by backprobing between ambient temperature sensor connector and terminal No. 52 at PCM C2 connector. If voltage drop is less than.1 volt, go to next step. If voltage drop is.1 volt or more, repair high resistance in ambient temperature sensor signal circuit.
6. If no other possible causes are remaining, replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 21

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 6. CAUTION: When performing test procedures, keep lighted cigarettes, sparks, flames and other ignition sources away from test area. Pressurizing fuel tank with less than 3 gallons of fuel may result in an explosion caused by ignition of the fumes. Wear safety glasses when performing test procedures.
2. To test EVAP system properly, fuel tank should be 20-80 percent full. Evaporative System Testing Kit (6872A) and Fuel Tank Cap Adapter (8382) are used to perform evaporative system pressure test. Connect EVAP system testing kit positive lead to positive battery terminal and negative lead to negative battery terminal. Perform pressure pump self-test on evaporative system testing kit by using instructions on cover of evaporative system testing kit. Remove gas cap and install fuel tank cap adapter on gas cap. Connect pressure supply hose from EVAP system testing kit to fitting on fuel tank cap adapter. Disconnect vacuum supply hose from LDP. (Scheme 11) Connect a continuous vacuum source (about 20 in. Hg) to LDP. An A/C evacuation unit works well. Turn ignition on. Using scan tool, select LEAK DETECTION PUMP TEST. Read instructions on scan tool, then press ENTER. Select #3 - HOLD PSI. On EVAP system testing kit, set PRESSURE/HOLD switch to OPEN position and set VENT switch to CLOSED position. Turn pump timer on and observe gauge. When gauge pressure reaches 14 in. H2O, turn PRESSURE/HOLD switch to CLOSED position. Turn pump timer off. Disconnect hose from EVAP canister that goes to fuel tank. (Scheme 11) If pressure dropped when hose was disconnected, go to next step. If pressure did not drop when hose was disconnected, repair obstruction in EVAP system between EVAP canister and fuel tank.
3. Reconnect vacuum hose to EVAP canister. Re-pressurize EVAP system by setting PRESSURE/HOLD switch to OPEN position and VENT switch to CLOSED position. Turn pump timer on and observe gauge. When gauge pressure reaches 14 in. H2O, turn PRESSURE/HOLD switch to CLOSED position. Turn pump timer off. Disconnect LDP-to-EVAP canister hose from EVAP canister. If pressure dropped when hose was disconnected, go to next step. If pressure did not drop when hose was disconnected, replace EVAP canister.
4. Reconnect LDP-to-EVAP canister hose. Re-pressurize EVAP system by setting PRESSURE/HOLD switch to OPEN position and VENT switch to CLOSED position. Turn pump timer on and observe gauge. When gauge pressure reaches 14 in. H2O, turn PRESSURE/HOLD switch to CLOSED position. Turn pump timer off. Disconnect EVAP hoses from purge solenoid. (Scheme 10) If pressure dropped when hoses were disconnected, go to next step. If pressure did not drop when hoses were disconnected, repair or replace EVAP hose/tube as necessary.
5. Disconnect and remove LDP pressure hose. LDP pressure hose connects EVAP canister to LDP. Inspect hose for obstructions and physical damage. Replace hose as necessary. If hose is okay, replace LDP.
6. At this time, conditions required to set this DTC are not present. Using scan tool, read FREEZE FRAME data while attempting to duplicate conditions that caused DTC to be set. Refer to any technical service bulletins that may apply. Using scan tool, select SYSTEM TESTS, then LDP MONITOR TEST. This will force PCM to run LDP monitor. If monitor fails, further diagnosis is required. If monitor passes, test is complete.

1. Turn ignition on. Using scan tool, actuate high speed radiator fan relay. Locate high speed radiator fan relay. High speed radiator fan relay is located in Power Distribution Center (PDC). (Scheme 22) If high speed radiator fan relay cycles on and off, go to next step. If high speed radiator fan relay does not cycle on and off, stop relay actuation and go to step 4.
2. Ensure high speed radiator fan relay is still actuated. Wiggle wiring harness from high speed radiator fan relay to PCM. PCM is located on left side of engine compartment, between PDC and Transmission Control Module (TCM). see scheme 2 If high speed radiator fan relay actuation is interrupted, repair connector or wiring harness where wiggling caused interruption. If no problems were found, go to next step.
3. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.
4. Turn ignition off. Remove high speed radiator fan relay from PDC. Turn ignition on. Measure voltage between ground and fused ignition switch output circuit (Light Green/Black wire) at terminal "A" at high speed radiator fan relay socket in PDC. (Scheme 22) If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open or short in fused ignition switch output circuit. See WIRING DIAGRAMS article.
5. Measure resistance between high speed radiator fan relay terminals "A" and "C". If resistance is 60-80 ohms, go to next step. If resistance is not 60-80 ohms, replace high speed radiator fan relay.
6. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of high speed radiator fan relay control circuit (Dark Blue/Light Green wire) between terminal "C" at high speed radiator fan relay harness connector and terminal No. 69 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Light Green wire.
7. Measure resistance between ground and high speed radiator fan relay control circuit (Dark Blue/Light Green wire) at terminal "C" at high speed radiator fan relay harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Light Green wire.
8. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.

Scheme 22

1. Turn ignition on. Using scan tool, actuate low speed radiator fan relay. Locate low speed radiator fan relay in Power Distribution Center (PDC). (Scheme 23) If low speed radiator fan relay cycles on and off, go to next step. If low speed radiator fan relay does not cycle on and off, stop relay actuation and go to step 4.
2. Ensure low speed radiator fan relay is still actuated. Wiggle wiring harness from low speed radiator fan relay to PCM. PCM is located on left side of engine compartment, between PDC and Transmission Control Module (TCM). see scheme 2 If low speed radiator fan relay actuation is interrupted, repair connector or wiring harness where wiggling caused interruption. If no problems were found, go to next step.
3. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.
4. Turn ignition off. Remove low speed radiator fan relay from PDC. Turn ignition on. Measure voltage between ground and fused ignition switch output circuit (Light Green/Black wire) at terminal "A" at low speed radiator fan relay harness connector. (Scheme 23) If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open or short in fused ignition switch output circuit. See WIRING DIAGRAMS article.
5. Measure resistance between low speed radiator fan relay terminals "A" and "C". If resistance is 60-80 ohms, go to next step. If resistance is not 60-80 ohms, replace low speed radiator fan relay.
6. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance of low speed radiator fan relay control circuit (Dark Blue/Pink wire) between terminal "C" at low speed radiator fan relay harness connector and terminal No. 55 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Pink wire.
7. Measure resistance between ground and low speed radiator fan relay control circuit (Dark Blue/Pink wire) at terminal "C" at low speed radiator fan relay harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Pink wire.
8. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.

Scheme 23

1. Turn ignition on. Using scan tool, read ambient temperature sensor voltage. If voltage is more than 4.8 volts, go to next step. If voltage is 4.8 volts or less, go to step 7.
2. Turn ignition off. Disconnect ambient temperature sensor harness connector. (Scheme 21) Turn ignition on. Measure voltage between ground and signal circuit (Violet/Light Green wire) at ambient temperature sensor harness connector. If voltage is 5.2 volts or less, go to next step. If voltage is more than 5.2 volts, repair short to voltage in Violet/Light Green wire.
3. Turn ignition off. Connect a jumper wire between ambient temperature sensor harness connector terminals. Turn ignition on. Using scan tool, read ambient temperature sensor voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace ambient temperature sensor.
4. Turn ignition off. Remove jumper wire. Disconnect PCM harness connectors. see scheme 2 Measure resistance of signal circuit (Violet/Light Green wire) between ambient temperature sensor harness connector and terminal No. 52 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/Light Green wire.
5. Measure resistance of sensor ground circuit (Black/Light Blue wire) between ambient temperature sensor harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
6. If no other possible causes are remaining, replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read ambient temperature sensor voltage. If voltage is less than.3 volt, go to next step. If voltage is.3 volt or more, go to step 6.
2. Turn ignition off. Disconnect ambient temperature sensor harness connector. (Scheme 21) Turn ignition on. Using scan tool, read ambient temperature sensor voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace ambient temperature sensor.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Violet/Light Green wire) at ambient temperature sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Violet/Light Green wire.
4. Measure resistance between ambient temperature sensor harness connector terminals. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
5. If no other possible causes are remaining, replace PCM.
6. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 7.
2. Turn ignition off. Disconnect engine vacuum supply hose at Leak Detection Pump (LDP). LDP is located on top of fuel tank. (Scheme 11) Install a vacuum gauge to disconnected vacuum hose. Start engine and observe vacuum gauge. If vacuum is 13 in. Hg or more, go to next step. If vacuum is less than 13 in. Hg, repair vacuum leak or vacuum obstruction as necessary.
3. Turn ignition off. Disconnect LDP harness connector. Turn ignition on. With scan tool in INPUTS/OUTPUTS, read LEAK DETECT PUMP SW state. Connect a jumper wire between battery voltage and LDP switch sense circuit (Orange/Red wire) at LDP harness connector. If LEAK DETECT PUMP SW state does not change, go to next step. If LEAK DETECT PUMP SW state changes, replace LDP.
4. Turn ignition off. Remove jumper wire. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and LDP switch sense circuit (Orange/Red wire) at LDP harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Orange/Red wire between LDP and PCM.
5. Measure resistance of LDP switch sense circuit (Orange/Red wire) between LDP harness connector and terminal No. 72 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Orange/Red wire.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 7.
2. Turn ignition off. Disconnect LDP connector. LDP is located on top of fuel tank. (Scheme 11) Turn ignition on. Connect a test light between fused ignition switch output circuit (Light Green/Black wire) and LDP solenoid control circuit (White/Dark Green wire) at LDP harness connector. Using scan tool, actuate LDP. If test light does not flash on and off, go to next step. If test light flashes on and off, replace LDP.
3. Connect test light between ground and fused ignition switch output circuit (Light Green/Black wire) at LDP harness connector. If test light illuminates, go to next step. If test light does not illuminate, repair open or short in fused ignition switch output circuit. See WIRING DIAGRAMS article.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and LDP solenoid control circuit (White/Dark Green wire) at LDP harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in White/Dark Green wire.
5. Measure resistance of LDP solenoid control circuit (White/Dark Green wire) between LDP harness connector and terminal No. 77 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White/Dark Green wire.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Note. Vehicles equipped with a 2.7L engine are equipped with a Manifold Absolute Pressure (MAP) sensor. Vehicles equipped with a 3.2L and 3.5L engine are equipped with an Intake Air Temperature/Manifold Absolute Pressure (IAT/MAP) sensor. For this test, IAT/MAP will be identified as MAP sensor.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 9.
2. Turn ignition off. Disconnect Throttle Position (TP) sensor connector. Turn ignition on. Measure voltage between ground and 5-volt supply circuit (Violet/White wire) at TP sensor harness connector. If voltage is less than 4.5 volts, go to next step. If voltage is 4.5 volts or more, go to step 8.
3. With voltmeter still connected between ground and Violet/White wire at TP sensor harness connector, turn ignition off. Disconnect MAP sensor harness connector. (Scheme 2)or (Scheme 3). Turn ignition on. If voltage does not change from less than 4.5 volts to more than 4.5 volts, go to next step. If voltage changes from less than 4.5 volts to more than 4.5 volts, replace MAP sensor. NOTE: A/C pressure sensor may also be referred to as A/C pressure transducer.
4. With voltmeter still connected between ground and Violet/White wire at TP sensor harness connector, turn ignition off. Disconnect A/C pressure sensor Gray connector. A/C pressure sensor is located in high pressure line, near A/C compressor. Turn ignition on. If voltage does not change from less than 4.5 volts to more than 4.5 volts, go to next step. If voltage changes from less than 4.5 volts to more than 4.5 volts, replace A/C pressure sensor.
5. With voltmeter still connected between ground and Violet/White wire at TP sensor harness connector, turn ignition off. Disconnect EGR solenoid harness connector. EGR solenoid is integral to EGR valve. EGR valve is mounted to rear of right cylinder head. Turn ignition on. If voltage does not change from less than 4.5 volts to more than 4.5 volts, go to next step. If voltage changes from less than 4.5 volts to more than 4.5 volts, replace EGR valve.
6. Turn ignition off. Ensure TP sensor, EGR solenoid, A/C pressure sensor and MAP sensor connectors are disconnected. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and Violet/White wire at TP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Violet/White wire.
7. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
8. Turn ignition off. Reconnect TP sensor connector. Disconnect MAP sensor connector. (Scheme 2)or (Scheme 3). Turn ignition on. Measure voltage between ground and Violet/White wire at MAP sensor harness connector. If voltage is 4.5 volts or more, go to next step. If voltage is less than 4.5 volts, replace TP sensor.
9. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Ensure battery is fully charged and generator belt tension and condition are okay. Turn ignition on. Using scan tool, actuate generator field driver. Using a test light connected to ground, backprobe generator field driver circuit (Dark Green wire) on back of generator. If test light illuminates brightly and flashes, go to next step. If test light does not illuminate brightly and flash, go to step 6.
2. Using scan tool, stop generator field driver actuation. Using scan tool, read target charging voltage. If target charging voltage is more than 13 volts, go to next step. If target charging voltage is 13 volts or less, go to step 4.
3. Start engine. Using scan tool, manually set engine speed to 1600 RPM. Using scan tool, read battery voltage and target charging voltage. Compare voltage readings. Observe voltage for up to 5 minutes (if necessary) for a one volt difference between battery voltage reading and target charging voltage reading. If difference between voltage and target charging voltage is one volt or less, go to step 5. If difference between voltage and target charging voltage is more than one volt, replace PCM.
4. Turn ignition off. Ensure battery is fully charged and generator belt tension and condition are okay. Start engine and warm to normal operating temperature. Using a thermometer, measure temperature near battery in engine compartment. Using scan tool, read battery temperature sensor temperature. Compare temperature readings. If scan tool display is within 10°F of actual underhood temperature, go to next step. If scan tool display is not within 10°F of actual underhood temperature, go to «DTC P1478: BATTERY TEMP SENSOR VOLTS OUT OF LIMIT»(ref-91093-S27022469832001030200000).
5. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.
6. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Disconnect Dark Green wire from back of generator. Measure resistance between ground and Dark Green wire at generator harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Green wire between generator and PCM.
7. Measure resistance between ground and generator field terminal (component side). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair or replace shorted generator as necessary.
8. If no other possible causes are remaining, replace PCM.

Note. A/C pressure sensor may also be referred to as A/C pressure transducer.

1. Ensure A/C system refrigerant is properly charged. Start engine. Using scan tool, read A/C pressure sensor voltage. If A/C pressure sensor voltage is more than 4.6 volts, go to next step. If A/C pressure sensor voltage is 4.6 volts or less, go to step 8.
2. Turn ignition off. Disconnect A/C pressure sensor Gray connector. A/C pressure sensor is located in high pressure line, near A/C compressor. Disconnect PCM harness connector. see scheme 2 Measure resistance between signal circuit (Dark Blue wire) and 5-volt supply circuit (Violet/White wire) at A/C pressure sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and 5-volt supply circuit between A/C pressure sensor and PCM.
3. Ensure ignition is off. Reconnect PCM connectors. Turn ignition on. Measure voltage between ground and signal circuit (Dark Blue wire) at A/C pressure sensor harness connector. If voltage is 5.2 volts or less, go to next step. If voltage is more than 5.2 volts, repair short to voltage in Dark Blue wire between A/C pressure sensor and PCM.
4. Turn ignition off. Connect a jumper wire between signal circuit (Dark Blue wire) and sensor ground circuit (Black/Light Blue wire) at A/C pressure sensor harness connector. Turn ignition on. Using scan tool, read A/C pressure sensor voltage. If voltage is one volt or more, disconnect jumper wire and go to next step. If voltage is less than one volt, replace A/C pressure sensor.
5. Turn ignition off. Disconnect PCM harness connectors. Measure resistance of signal circuit (Dark Blue wire) between A/C pressure sensor harness connector and terminal No. 42 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue wire.
6. Reconnect PCM harness connectors. Measure resistance between ground and sensor ground circuit (Black/Light Blue wire) at A/C pressure sensor harness connector. If resistance is less than 30 ohms, go to next step. If resistance is 30 ohms or more, repair open in sensor ground circuit.
7. If no other possible causes are remaining, replace PCM.
8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Ensure A/C system refrigerant is properly charged. With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Ensure A/C system refrigerant is properly charged. Start engine. Using scan tool, read A/C pressure sensor voltage. If A/C pressure sensor voltage is less than.07 volt, go to next step. If A/C pressure sensor voltage is.07 volt or more, go to step 10.
2. Turn ignition off. Disconnect A/C pressure sensor harness connector. A/C pressure sensor is located in high pressure line, near A/C compressor. Turn ignition on. Measure voltage between ground and 5-volt supply circuit (Violet/White wire) at A/C pressure sensor harness connector. If voltage is 4.5-5.2 volts, go to next step. If voltage is not 4.5-5.2 volts, go to step 7.
3. Ensure A/C pressure sensor harness connector is disconnected. Using scan tool, read A/C pressure sensor voltage. If voltage is.07 volt or less, go to next step. If voltage is more than.07 volt, replace A/C pressure sensor.
4. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and signal circuit (Dark Blue wire) at A/C pressure sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue wire between A/C pressure sensor and PCM.
5. Measure resistance between signal circuit (Dark Blue wire) and sensor ground circuit (Black/Light Blue wire) at A/C pressure sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short between signal circuit and sensor ground circuit.
6. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
7. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Measure resistance between ground and 5-volt supply circuit (Violet/White wire) at A/C pressure sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in 5-volt supply circuit.
8. Measure resistance of 5-volt supply circuit (Violet/White wire) between A/C pressure sensor harness connector and terminal No. 62 at PCM C2 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/White wire.
9. If no other possible causes are remaining, replace PCM.
10. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: Ensure A/C system refrigerant is properly charged. With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Using scan tool, attempt to program PCM. Turn ignition on. Start engine. If engine will not start, crank engine for 15 seconds. Turn ignition off. Repeat at least once. If engine starts, allow it to reach normal operating temperature. Using scan tool, read DTCs. If DTC P1602 is displayed, replace PCM. If DTC P1602 is not displayed, test is complete.

1. Inspect vehicle for aftermarket accessories that may exceed generator output. Ensure battery is fully charged and generator belt condition and tension are okay before proceeding with test. Start engine and wait until idle speed is stabilized. Using scan tool, read target charging voltage. If target charging voltage is more than 15.1 volts, go to next step. If target charging voltage is 15.1 volts or less, go to step 3.
2. Ensure engine is running and it is at normal operating temperature. Using a thermometer, measure temperature near battery in engine compartment. Using scan tool, read battery temperature. Compare temperature readings. If scan tool display is within 10°F of actual underhood temperature, go to step 9. If scan tool display is not within 10°F (6°C) of actual underhood temperature, go to «DTC P1478: BATTERY TEMP SENSOR VOLTS OUT OF LIMIT»(ref-91093-S27022469832001030200000).
3. With engine running, Measure voltage drop between generator B+ terminal and battery positive terminal (post). Start engine. If voltage drop is.4 volt or less, go to next step. If voltage is more than.4 volt, repair high resistance in B+ circuit (Red wire) between generator and battery.
4. With engine running at normal operating temperature, measure voltage drop between generator case and battery negative terminal (post). If voltage drop is.1 volt or less, go to next step. If voltage drop is more than.1 volt, repair high resistance in generator ground between generator case and battery negative terminal.
5. Using scan tool, manually set engine speed to 1600 RPM. Turn on all accessories. Using scan tool, read and compare target charging voltage and charging voltage. If difference between target voltage and charging voltage is more than one volt, go to next step. If difference between target charging voltage and charging voltage is one volt or less, go to step 9.
6. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Disconnect generator 2-pin connector. Measure resistance of generator field driver circuit (Dark Green wire) between generator 2-pin harness connector and terminal No. 8 at PCM C1 harness connector. (Scheme 4) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green wire.
7. Reconnect PCM harness connectors. Turn ignition on. Using scan tool, actuate generator field driver. Connect a test light between ground and ASD relay output circuit (Orange/Dark Green wire) at generator 2-pin harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or short in ASD relay output circuit. See WIRING DIAGRAMS article.
8. If no other possible causes are remaining, replace generator.
9. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read PCM DTCs. If DTC P1685 is displayed and STARTS SINCE SET counter is equal to zero, go to next step. If DTC P1685 is not displayed and STARTS SINCE SET counter is not equal to zero, go to step 7 .
2. Using scan tool, attempt to communicate with SKIM. If scan tool communicates with SKIM, go to next step. If scan tool does not communicate with SKIM, go to BUS +/- SIGNAL OPEN FROM SKIM under COMMUNICATIONS SYSTEM under SYSTEM TESTS in BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
3. Using scan tool, check for SKIM DTCs. If no SKIM DTCs are present, go to next step. If any DTCs are present, repair SKIM DTCs before continuing with this test. See BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
4. Using scan tool, display Vehicle Identification Number (VIN) that is programmed into PCM. If VIN is programmed into PCM, go to next step. If VIN has not been programmed into PCM, use scan tool and program VIN into PCM.
5. Using scan tool, display VIN that is programmed into PCM. If correct VIN is displayed, go to next step. If correct VIN is not displayed, replace PCM.
6. Turn ignition off. Replace SKIM and program new SKIM. See REMOVAL & INSTALLATION in BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT. Start engine. Using scan tool, read PCM DTCs. If DTC P1685 resets, replace PCM. If DTC P1685 does not reset, test is complete.
7. DTC P1685 may have been set if SKIM was disconnected or recently replaced. All customer's ignition keys for this vehicle must be tested at this time. Turn ignition on. Using scan tool, verify correct VIN is programmed in PCM and SKIM. Turn ignition off and remove ignition key. Using another customer key, turn ignition on and crank engine. Using scan tool, read PCM DTCs. If DTC P1685 is displayed and STARTS SINCE SET counter is equal to zero, replace ignition key. If DTC P1685 is not displayed and STARTS SINCE SET counter is not equal to zero, test is complete. If DTC P1685 cannot be reset, there may have been a theft attempt.

1. Turn ignition on. Using scan tool, read PCM DTCs. If DTC P1686 is present and STARTS SINCE SET counter is equal to zero, go to next step. If DTC P1686 is not present and STARTS SINCE SET counter is not equal to zero, go to step 5.
2. Using scan tool, attempt to communicate with SKIM. If scan tool communicates with SKIM, go to next step. If scan tool does not communicate with scan tool, go to BUS +/- SIGNAL OPEN FROM SKIM under COMMUNICATIONS SYSTEM under SYSTEM TESTS in BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT. NOTE: PCI bus circuit (Violet/Yellow wire) between PCM and SKIM runs through Body Control Module (BCM).
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Disconnect SKIM harness connector. SKIM is located on steering column. Measure resistance of Violet/Yellow wire between terminal No. 2 at SKIM harness connector and terminal No. 59 at PCM C2 harness connector. (Scheme 4)and (Scheme 24). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair PCI bus circuit (Violet/Yellow wire) between PCM and SKIM. See WIRING DIAGRAMS article.
4. Turn ignition off. Replace SKIM. Turn ignition on. Using scan tool, display and clear all PCM and SKIM DTCs. Perform 5 ignition key cycles leaving ignition on for 90 seconds per cycle. Using scan tool, read PCM DTCs. If DTC P1686 is displayed, replace PCM. If DTC P1686 is not displayed, test is complete.
5. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 24

1. Turn ignition on. Using scan tool, clear DTCs. Cycle ignition switch on and off several times. Using scan tool, read DTCs. If DTC P1687 is displayed, go to next step. If DTC P1687 is not displayed, go to step 3 .
2. Using scan tool, attempt to communicate with instrument cluster. If communication can be established with instrument cluster, replace PCM. If communication cannot be established with instrument cluster, repair communication problem. See BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
3. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Using scan tool, clear DTCs. Cycle ignition on and off several times. Using scan tool, read DTCs. If DTC P1695 is displayed, go to next step. If DTC P1695 is not displayed, go to step 3 .
2. Using scan tool, attempt to communicate with BCM. If communication can be established with BCM, replace PCM. If communication cannot be established with BCM, repair communication problem. See BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
3. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Using scan tool, perform SRI memory test. If scan tool displays WRITE FAILURE, replace PCM. If scan tool does not display WRITE FAILURE, go to next step.
2. Using scan tool, perform SRI memory test again. If scan tool displays WRITE REFUSED, go to next step. If scan tool does not display WRITE REFUSED, go to step 4 .
3. Using scan tool, attempt SRI memory test 3 more times. If scan tool still displays WRITE REFUSED, replace PCM. If scan tool does not display WRITE REFUSED, test is complete.
4. Using scan tool, perform SRI memory test again. If scan tool displays SRI MILEAGE INVALID, update mileage and retest SRI memory. If scan tool does not display SRI MILEAGE INVALID, go to next step.
5. Compare SRI mileage stored with instrument panel odometer. If mileage is within specified range displayed on scan tool, test is complete. If mileage is not within specified range displayed on scan tool, update mileage and retest SRI memory.

1. Turn ignition on. Using scan tool, clear DTCs. Cycle ignition on and off several times. Using scan tool, read DTCs. If DTC P1698 is displayed, go to next step. If DTC P1698 is not displayed, go to step 3 .
2. Turn ignition on. Using scan tool, attempt to communicate with TCM. If communication can be established with TCM, replace PCM. If communication cannot be established with TCM, repair communication problem. See BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
3. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step 7.
2. Using scan tool, read park/neutral switch input state. Observe scan tool display while moving gear selector through all gear positions. If scan tool displays P/N and D/R in correct gear positions, go to step 7. If scan tool does not display P/N and D/R in correct gear positions, go to next step.
3. Turn ignition off. Disconnect PCM harness connectors. see scheme 2 Disconnect TRS 10-pin connector located on left side of transaxle. Measure resistance between ground and TRS T41 sense circuit (Black/White wire) at terminal No. 5 at TRS harness connector. (Scheme 25) If resistance is more than 100 k/ohms, go to next step. If resistance is 100 k/ohms or less, repair short to ground in TRS T41 sense circuit.
4. Measure resistance of TRS T41 sense circuit between terminal No. 5 (Black/White wire) at TRS harness connector and terminal No. 76 (Brown/Yellow wire) at PCM C2 harness connector. (Scheme 4)and (Scheme 25). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in TRS T41 sense circuit.
5. Reconnect TRS harness connector. Measure resistance between ground and terminal No. 76 (Brown/Yellow wire) at PCM C2 harness connector while moving gear selector through all gear positions. Resistance should switch from more than 10 ohms when transmission is not in Park or Neutral to less than 10 ohms when transmission is in Park or Neutral. If resistance is as specified, go to next step. If resistance is not as specified, replace TRS.
6. If no other possible causes are remaining, replace PCM.
7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition: With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set. Review freeze frame information on scan tool. Duplicate conditions present when DTC was set. Refer to any technical service bulletins that may apply. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. If a problem is found, repair as necessary. If no problems are found, test is complete.

Scheme 25

POWERTRAIN VERIFICATION TEST VER-1

Note. If replacing Powertrain Control Module (PCM), the correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Anti-Lock Brake System (ABS) module and Air Bag Control Module (ACM). If replacing PCM and vehicle is equipped with Sentry Key Immobilizer Module (SKIM), secret key data must also be updated to enable engine starting. See PROGRAMMING .

1. Inspect vehicle to ensure all engine components are connected properly. Reassemble and reconnect components as necessary. If repair procedure did not include replacing PCM, go to next step. If PCM has been replaced and has already been programmed, go to next step. If PCM has been replaced but has not been programmed, program PCM and clear DTCs. See «PROGRAMMING»(ref-91093-S41080259492001030200000) . After PCM is programmed, go to next step.
2. Inspect engine oil for fuel contamination. Change engine oil and filter as necessary. Attempt to start engine. If engine starts, go to next step. If engine does not start, go to appropriate TROUBLE SHOOTING - NO CODES article for additional testing. Also, refer to any technical service bulletins that may apply.
3. Run engine for one warm-up cycle to verify operation. Using scan tool, confirm that no DTCs or secondary indicators are present and that all components are functioning properly. If a DTC is present, repair is not complete. Perform appropriate test. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) . If no DTCs are present, repair is complete.

POWERTRAIN VERIFICATION TEST VER-2

Note. If replacing Powertrain Control Module (PCM), the correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Anti-Lock Brake System (ABS) module and Air Bag Control Module (ACM). If replacing PCM and vehicle is equipped with Sentry Key Immobilizer Module (SKIM), secret key data must also be updated to enable engine starting. See PROGRAMMING .

1. Inspect vehicle to ensure all engine components are connected properly. Reassemble and reconnect components as necessary. Using scan tool, clear DTCs. Run engine for one warm-up cycle to verify proper operation. Road test vehicle and use all accessories that may be related to repair.
2. Using scan tool, confirm that no DTCs or secondary indicators are present and that all components are functioning properly. Verify symptom is no longer present. If symptom is still present or any other symptom is present, go to appropriate TROUBLE SHOOTING - NO CODES article for additional testing. Also, refer to any technical service bulletins that may apply.
3. If any DTCs are present, perform appropriate test. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) . If no DTCs are present and all components are functioning properly, repair is complete.

POWERTRAIN VERIFICATION TEST VER-3

Note. If replacing Powertrain Control Module (PCM), the correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Anti-Lock Brake System (ABS) module and Air Bag Control Module (ACM). If replacing PCM and vehicle is equipped with Sentry Key Immobilizer Module (SKIM), secret key data must also be updated to enable engine starting. See PROGRAMMING .

1. Inspect vehicle to ensure all engine components are connected properly. Reassemble and reconnect components as necessary. Using scan tool, clear DTCs. Perform generator output test. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.
2. Start engine and hold engine speed at 2000 RPM for at least 30 seconds. Cycle ignition off and on. Using scan tool, read DTCs. If DTC resets, or another DTC sets, perform appropriate test. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) .
3. If another symptom exists, go to appropriate TROUBLE SHOOTING - NO CODES article for additional testing. If no DTCs are present and all components are functioning properly, repair is complete.

POWERTRAIN VERIFICATION TEST VER-5

Note. If replacing Powertrain Control Module (PCM), the correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Anti-Lock Brake System (ABS) module and Air Bag Control Module (ACM). If replacing PCM and vehicle is equipped with Sentry Key Immobilizer Module (SKIM), secret key data must also be updated to enable engine starting. See PROGRAMMING .

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. Connect scan tool to Data Link Connector (DLC). If a comprehensive component DTC was repaired, go to next step. If a major OBD-II monitor DTC was repaired, go to step 3 .
2. Ensure fuel tank is at least 1/4 full. Turn off all accessories. After ignition has been off for 10 seconds, start engine and let it run for 2 minutes. If GOOD TRIP counter changed to one or more and no new DTCs are present, repair is complete.
3. If repaired DTC has reset, repair is not complete. Check for related technical service bulletins or flash updates and return to «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) .
4. If another DTC has set, perform appropriate test. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) .
5. Using scan tool, monitor appropriate pre-test enabling conditions until all conditions have been met. Once conditions have been met, select appropriate OBD-II monitor.
6. If monitor ran, and GOOD TRIP counter changed to one or more, repair was successful and is now complete. If repaired OBD-II DTC has reset or was seen in monitor during road test, repair is not complete. Check for any related technical service bulletins for flash updates and return to «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) .
7. If another DTC has set, perform appropriate test. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) .

POWERTRAIN VERIFICATION TEST VER-6

Note. If replacing Powertrain Control Module (PCM), the correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Anti-Lock Brake System (ABS) module and Air Bag Control Module (ACM). If replacing PCM and vehicle is equipped with Sentry Key Immobilizer Module (SKIM), secret key data must also be updated to enable engine starting. See PROGRAMMING .

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. Connect scan tool to Data Link Connector (DLC).
2. Start engine and let it idle. Turn off all accessories. Ensure transmission is in Park. Using scan tool, select SYSTEM TESTS, then LDP MONITOR TEST. Follow instructions on scan tool screen. NOTE: Engine must remain at idle with shift lever in Park, and throttle at idle position when performing LDP monitor test. This test will only store a small leak DTC to indicate there is a problem with system. System failure may have been caused by a large leak, but PCM will only set small leak DTC to indicate that a failure occurred during test. NOTE: LDP MONITOR TEST MODE is used when performing this test to verify repairs and check operation of leak detection pump system. When performing this test, operating mode of Powertrain Control Module (PCM) will be changed. It is critical that LDP monitor test mode not be interrupted. If LDP dealer test mode is interrupted, PCM will remain in changed mode. This will cause PCM to illuminate MIL for 8-10 miles of driving and no DTCs will be stored in PCM. Clearing DTCs from PCM will not change this condition. If a vehicle is found with PCM stuck in this changed mode, LDP monitor test should be performed in its entirety so proper PCM operating mode may be obtained.
3. If a DTC for a small leak is set, repair is not complete. Check for related technical service bulletins and return to diagnostic test from which you came. If any other DTC exists, perform appropriate diagnostic test(s). See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) . If LDP monitor passed, test is complete.

SKIS VERIFICATION TEST

Note. If replacing Powertrain Control Module (PCM), the correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Anti-Lock Brake System (ABS) module and Air Bag Control Module (ACM). If replacing PCM and vehicle is equipped with Sentry Key Immobilizer Module (SKIM), secret key data must also be updated to enable engine starting. See PROGRAMMING .

Note. Sentry Key Immobilizer Module (SKIM) will only remain in secured access mode for 60 seconds. If incorrect unique Personal Identification Number (PIN) is entered 3 times, SKIM will be locked for one hour. To unlock SKIM, turn ignition on for one hour. When SKIM is locked, scan tool will display BUS +/- SIGNALS OPEN.

1. Obtain vehicle's unique Personal Identification Number (PIN) assigned to SKIM from vehicle owner or manufacturer. Remove all test equipment and jumper wires. Connect any disconnected components. Go to next step.
2. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select SKIM MODULE REPLACEMENT. Enter 4-digit PIN number to put SKIM in access mode. Go to next step.
3. Using scan tool, select THEFT ALARM, SKIM, MISCELLANEOUS, then select desired procedure and follow steps displayed on scan tool. If SKIM has been replaced, ensure all keys and remote transmitters to be used with vehicle are programmed into SKIM. Go to next step.
4. Using scan tool, retrieve DTCs from all modules. If no DTCs exist, system is operating correctly and customer's complaint cannot be duplicated, repair is complete. If any DTCs exist, perform appropriate test(s). See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) .

TRANSMISSION VERIFICATION TEST

Note. If Transmission Control Module (TCM) or torque converter was replaced or transmission has been repaired or replaced, scan tool must be used to perform quick learn procedure. See PROGRAMMING .

1. Remove all test equipment and jumper wires. Connect any disconnected components. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, clear DTCs from all modules. Using scan tool, check transmission temperature. Start vehicle and let idle until transmission temperature is greater than 110°F (43°C). Go to next step.
2. Check transmission fluid level and adjust as necessary. Using scan tool, monitor engine RPM. Test drive vehicle from a stop to 45 MPH with a constant throttle opening of 20-25 degrees 15-20 times, allowing transmission to upshift through all gears. Go to next step.
3. While driving at less than 25 MPH, make 5-8 wide open throttle kickdowns to 1st gear, allowing 5 seconds in 2nd and 3rd gears between each kickdown. Using scan tool, retrieve DTCs from all modules during test drive. If no DTCs exist, system is operating correctly and customer's complaint cannot be duplicated, repair is complete. If any DTCs exist, perform appropriate test(s). See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-91093-S04983064952001030200000) .