Engine Controls - Tests W/codes - 3.9l Dodge Pickup R2500

INTRODUCTION

Perform all steps in appropriate BASIC TESTING article. If no fault is found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) or only pass codes (system functioning properly) are found during self-diagnostics, proceed to NO TROUBLE CODES (NTC) TESTS or TESTS W/O CODES article for diagnosis by symptom.

MODEL IDENTIFICATION

Vehicle body codes are used throughout self-diagnostic tests. See BODY CODE DESIGNATION table for model identification.

BODY CODE DESIGNATION

SYSTEM DIAGNOSTICS

Note. Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRB) scan tool. If using a generic scan tool, ensure scan tool is OBD-II certified. A generic scan tool may not be capable of performing all necessary test functions. Malfunction Indicator Light (MIL), also known as CHECK ENGINE light (located on instrument panel) or digital odometer (if equipped), may also be used for system diagnostics, but has limited diagnostic capability.

MIL

The Powertrain Control Module (PCM), located in engine compartment, monitors several different engine control system circuits. See PCM LOCATION table. If a malfunction occurs which affects vehicle emissions, PCM will turn on MIL the next time engine is started and the same malfunction is detected.

PCM LOCATION

Note. For information about engine misfire and fuel system monitoring, see ON-BOARD DIAGNOSTICS.

If PCM detects a cylinder(s) misfire, lean fuel condition or a rich fuel condition, MIL is immediately turned on. On manual transmission vehicles, MIL will either flash or light continuously during an active engine misfire. PCM will turn off MIL when malfunction is not detected during 3 run/stop cycles of engine of at least a 2 minute duration. MIL may be turned off by PCM, however, a DTC may remain stored depending on type of malfunction detected.

On-Board Diagnostics

The PCM monitors several different engine control system circuits. If malfunction occurs, PCM will store a DTC when malfunction is detected, and PCM will enter limp-in mode. In limp-in mode, PCM substitutes values for failed component to continue engine operation, but loss of good driveability may result.

The PCM contains electronic circuit monitors that monitor fuel, vehicle emissions, engine and ignition system performance. Monitors use information from various sensor circuits for system monitoring. Monitors do not indicate a specific component failure, but indicate an implied failure within a specified system, and that the problem must be diagnosed. If any monitor detects a problem affecting vehicle emissions, a DTC will be stored in PCM. The following monitors are used

1. EGR Monitor
2. Engine Misfire Monitor
3. Fuel System Monitor
4. Oxygen Sensor Monitor
5. Oxygen Sensor Heater Monitor
6. Catalyst Monitor
7. EVAP System Leak Detection Monitor

The PCM will erase DTC once MIL is turned off. Once MIL is turned off, PCM must not detect the recent malfunction during 40 run/stop engine cycles with engine coolant temperature at least 160°F (71°C) on normal operation, or 80 run/stop engine cycles with engine coolant temperature at least 160°F (71°C) on engine misfire or fuel system monitor.

PCM also records and stores engine operating conditions when malfunction occurred. This information is referred to as freeze frame data. If malfunction is an engine misfire or fuel system rich or fuel system lean, freeze frame data will be updated with the most current information regarding these failures. Freeze frame data recorded is

1. Fuel System Status
2. Load Value (Displayed As Percent)
3. Long Term Adaptive (Displayed As Percent)
4. Short Term Adaptive (Displayed As Percent)
5. Absolute MAP (Displayed As Percent)
6. Engine RPM
7. Vehicle Speed Sensor
8. DTC During Data Recording

DTCs may be retrieved for system diagnosis by using scan tool, MIL or digital odometer (if equipped). See RETRIEVING DTCS under SELF-DIAGNOSTIC SYSTEM. By using scan tool and MIL or digital odometer, self-diagnostic capabilities of this system can simplify testing and reduce diagnostic time. System malfunctions are identified as either hard failures or intermittent failures.

Hard Failures

Hard failures cause MIL to illuminate and remain on until problem is repaired. If MIL comes on and remains on during vehicle operation, cause of malfunction must be determined by retrieving DTCs. See RETRIEVING DTCS under SELF-DIAGNOSTIC SYSTEM. If a sensor fails, PCM will use substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, the vehicle runs but driveability will not be optimum.

Intermittent Failures

Intermittent failures may cause MIL to flicker or illuminate and go out after intermittent failure goes away. However, the corresponding DTC will be retained in PCM memory. If related failure does not reoccur within a certain time frame, related DTC will be erased from PCM memory. Intermittent failures may be caused by a sensor, connector or wiring related problems. See INTERMITTENTS in appropriate TESTS W/O CODES article.

SERVICE PRECAUTIONS

Before proceeding with system diagnosis, following precautions must be followed

1. Ensure fuel pressure is released before removing fuel line or fittings, as fuel system is under pressure and may cause personal injury. See FUEL PRESSURE RELEASE procedure.
2. When performing self-diagnostic tests, DO NOT skip any steps, or incorrect diagnosis may result. Always perform indicated verification procedure after each repair.
3. When using a jumper wire, ensure either jumper wire or circuit is fuse-protected.
4. Before disconnecting connector from any control module, ensure ignition is off before removing connector.
5. When checking voltage or continuity at any control module, DO NOT backprobe connector (unless instructed to do otherwise in test procedure), or probe wires through the insulation.
6. DO NOT cause short circuits when performing electrical tests. This will set additional DTCs, making diagnosis of original problem more difficult.
7. Use test equipment specified in test procedures when performing electrical tests.
8. When checking for spark, ensure cable is NOT more than 1/4" from engine ground. If cable is more than 1/4" from engine ground, damage to vehicle electronics and/or PCM may result.
9. DO NOT prolong testing of fuel injectors or engine may hydrostatically lock.

DIAGNOSTIC PROCEDURE

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. Always perform a visual inspection before attempting to diagnose engine control system problems. See VISUAL INSPECTION. Retrieve DTCs using MIL and scan tool or digital odometer (if equipped). See RETRIEVING DTCS.

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. Inspect all engine control system components, hoses, connectors and wiring for damage before proceeding with system testing.

RETRIEVING DTCS

Note. It will be necessary to use MIL or digital odometer (if equipped) and scan tool to retrieve all DTCs. When using MIL or digital odometer to retrieve DTCs, some DTCs have more than one meaning. MIL or digital odometer is unable to distinguish between different failures for a specified component. For example, there are several possible failures for the oxygen sensor system, but the MIL or digital odometer can only identify an oxygen sensor failure by displaying a DTC 21. Scan tool is able to distinguish between different failures. When using a scan tool, scan tool is not able to identify all possible DTCs. As an example, scan tool may not be able to identify or display a DTC for a malfunctioning A/C clutch relay circuit, Auto Shutdown (ASD) relay circuit, or charging system voltage circuit, but these DTCs will be displayed by MIL or digital odometer.

Using Digital Odometer (If Equipped)

1. Ensure battery is fully charged. Attempt to start engine. Turn ignition off. Without starting engine, turn ignition on, off, on, off and on within 5 seconds.
2. After a short pause, odometer reading is replaced by a 2-digit DTC. If more than one DTC is stored, after first DTC is displayed, there will be a short pause and then another stored DTC will be displayed.
3. DTC 55 will always be last DTC displayed. After DTC 55 is displayed, odometer returns to normal mode. Once all DTCs are recorded, retrieve DTCs using scan tool to ensure all DTCs are obtained. See USING SCAN TOOL.

Using Malfunction Indicator Light (MIL)

1. Ensure battery is fully charged. Turn ignition on and note operation of MIL. When ignition is first turned on, MIL should come on and remain on for 3 seconds to verify bulb and circuit operation, and then go off. NOTE: If MIL does not come on for 3 seconds and then go off, bulb circuit may be defective, or problem area may exist on CCD Bus between PCM and instrument cluster. If problem exists with CCD Bus, this problem may be displayed when using scan tool to retrieve DTCs.
2. Attempt to start engine. Turn ignition off. Without starting engine, turn ignition on, off, on, off and on within 5 seconds. Record 2-digit DTCs as displayed by flashing MIL.
3. For example, DTC 24 will be displayed by 2 flashes, short pause, and then 4 more flashes. A short pause will exist between first and second digits on DTC. If more than one DTC is stored, after first DTC is displayed, there will be a longer pause and then another stored DTC will be displayed.
4. Once all DTCs are recorded, retrieve DTCs using scan tool to ensure all DTCs are obtained. See USING SCAN TOOL.

Scheme 1

1. Ensure battery is fully charged. Attempt to start engine. Turn ignition off. Connect scan tool to Data Link Connector (DLC). DLC is located below instrument panel near steering column. (Scheme 1)
2. Turn ignition on. Using scan tool manufacturer's instructions, record all DTCs displayed on scan tool. Using all DTCs obtained, proceed to SELF-DIAGNOSTICS TESTS. Once all repairs are made, ensure DTCs are cleared from PCM memory. See CLEARING DTCS.

CLEARING DTCS

Ensure ignition is off, then turn ignition on. Using scan tool manufacturer's instructions, erase DTCs from PCM memory.

INACTIVE DTC CONDITION

This procedure applies if you have been sent here from diagnostic tests and have just attempted to simulate the condition that initially set the DTC. The following additional checks may assist in identifying a possible intermittent problem

1. Visually inspect related wiring harness connectors for broken, bent, pushed out or corroded terminals.
2. Visually inspect related wiring harnesses for chafed, pierced or partially broken wires.
3. Check for pertinent Technical Service Bulletins (TSBs) relating to the problem.

FUEL PRESSURE RELEASE

VEHICLES WITH FUEL RAIL TEST PORT

1. Loosen fuel tank filler cap. Ensure ignition is off. Remove protective cap from fuel rail test port.
2. Place one end of Fuel Pressure Release Hose (C-4799-1) into an approved fuel container. Attach remaining end of hose to fuel rail test port. Use care, as fuel system may be under pressure. Fuel pressure will be released from fuel system. Remove hose, reinstall protective cap, and fuel tank filler cap.
3. Wait 5 seconds. Use care when disconnecting fuel lines, as some fuel pressure may still exist in fuel lines.

Note. One or more DTCs may set when fuel pump relay is removed. Clear DTCs after fuel pressure release procedure. See CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM.

VEHICLES WITHOUT FUEL RAIL TEST PORT

1. Remove fuel pump relay from Power Distribution Center (PDC). Relays are identified on label under PDC cover. Start and run engine until it stalls. Attempt to start engine. Continue restarting engine until it will no longer run. Turn ignition off. CAUTION: DO NOT supply power to fuel injector for more than 4 seconds, or fuel injector may be damaged.
2. Disconnect any fuel injector connector. Connect a jumper wire between either fuel injector terminal and positive battery terminal. Connect another jumper wire to other fuel injector terminal. Momentarily touch other end of jumper wire to negative battery terminal.
3. Place a shop towel under fuel line quick-connector at fuel rail. Use care when disconnecting fuel lines, as some fuel pressure may still exist in fuel lines. Disconnect fuel line quick-connector. Reinstall fuel pump relay in PDC. Clear DTCs. See CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM.

SUMMARY

If no hard failure DTCs are present, driveability symptoms exist or intermittent DTCs exist, proceed to NO TROUBLE CODES (NTC) TESTS, or TESTS W/O CODES article for diagnosis by symptom.

CONNECTOR IDENTIFICATION

Note. The following terminals are shown as viewed from harness side of connector. If actual connector wire colors differ from those shown in illustration, see appropriate wiring diagram in WIRING DIAGRAMS article to ensure correct circuit is being tested.

CONNECTOR IDENTIFICATION DIRECTORY

Scheme 2

A/C CLUTCH RELAY CONNECTOR TERMINAL IDENTIFICATION

Scheme 3

Scheme 4

BATTERY TEMPERATURE SENSOR CONNECTOR TERMINAL IDENTIFICATION

Scheme 5

BRAKELIGHT SWITCH CONNECTOR TERMINAL IDENTIFICATION

Scheme 6

CAMSHAFT POSITION (CMP) SENSOR CONNECTOR TERMINAL IDENTIFICATION

Scheme 7

CRANKSHAFT POSITION (CKP) SENSOR CONNECTOR TERMINAL ID

Scheme 8

DATA LINK CONNECTOR (DLC) TERMINAL IDENTIFICATION

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

ENGINE COOLANT TEMPERATURE (ECT) SENSOR CONNECTOR TERMINAL ID

Scheme 15

EVAP SOLENOID CONNECTOR TERMINAL IDENTIFICATION

Scheme 16

FUEL PUMP CONNECTOR TERMINAL IDENTIFICATION

Scheme 17

Scheme 18

IDLE AIR CONTROL (IAC) MOTOR CONNECTOR TERMINAL IDENTIFICATION

Scheme 19

INTAKE AIR TEMPERATURE (IAT) SENSOR CONNECTOR TERMINAL ID

Scheme 20

LEAK DETECTION (LDP) PUMP CONNECTOR TERMINAL IDENTIFICATION

Scheme 21

MAP SENSOR CONNECTOR TERMINAL IDENTIFICATION

Scheme 22

Scheme 23

OVERDRIVE (O/D) OFF SWITCH CONNECTOR TERMINAL IDENTIFICATION

Scheme 24

PARK/NEUTRAL POSITION (PNP) SWITCH CONNECTOR TERMINAL ID

Scheme 25

POWER STEERING PRESSURE (PSP) SWITCH CONNECTOR TERMINAL ID

Scheme 26

Scheme 27

RADIATOR COOLING FAN RELAY CONNECTOR TERMINAL IDENTIFICATION

Scheme 28

SPEED CONTROL (S/C) SERVO CONNECTOR TERMINAL IDENTIFICATION

Scheme 29

SPEED CONTROL (S/C) SWITCH CONNECTOR TERMINAL IDENTIFICATION

Scheme 30

THROTTLE POSITION (TP) SENSOR CONNECTOR TERMINAL IDENTIFICATION

Scheme 31

TRANSMISSION CONTROL RELAY CONNECTOR TERMINAL IDENTIFICATION

Scheme 32

Scheme 33

Scheme 34

TRANSMISSION SOLENOID CONNECTOR TERMINAL IDENTIFICATION

Scheme 35

VEHICLE SPEED SENSOR (VSS) CONNECTOR TERMINAL IDENTIFICATION

Scheme 36

Scheme 37

1/1 HEATED OXYGEN SENSOR (HO2S) CONNECTOR TERMINAL ID (1)

Scheme 38

1/2 HEATED OXYGEN SENSOR (HO2S) CONNECTOR TERMINAL ID (1)

Scheme 39

1/3 HEATED OXYGEN SENSOR (HO2S) CONNECTOR TERMINAL ID

Scheme 40

2/1 HEATED OXYGEN SENSOR (HO2S) CONNECTOR TERMINAL ID (1)

SELF-DIAGNOSTIC SYSTEM

Note. Information on Cherokee is not available from manufacturer.

Vehicle body codes are used throughout self-diagnostic tests. See BODY CODE DESIGNATION table for model identification.

BODY CODE DESIGNATION

SELF-DIAGNOSTIC TESTS

Note. In following self-diagnostic tests, illustrations are courtesy of Chrysler Corp.

DTC TEST - CHECKING SYSTEM FOR DIAGNOSTIC TROUBLE CODES

Note. Ensure battery is fully charged before proceeding with test.

1. Attempt to start engine. Crank engine for up to 10 seconds (if necessary). Diagnostic Trouble Codes (DTCs) may be retrieved using scan tool, Malfunction Indicator Light (MIL) on instrument panel or digital odometer (if equipped).
2. If using MIL on instrument panel to check for DTCs, see USING MALFUNCTION INDICATOR LIGHT (MIL) under RETRIEVING DTCS for proper procedure. Go to step 6).
3. If using scan tool to check for DTCs, see USING SCAN TOOL under RETRIEVING DTCS.
4. If scan tool displays NO RESPONSE, go to TEST NS-SEL. If scan tool will not power up, check for loose cable connections or bad cable. If cable connections and cable are okay, check voltage at DLC terminal No. 16 (Pink wire). Voltage should be at least 11 volts. If voltage is not as specified, check wiring circuit and necessary fuses. See appropriate wiring diagram in WIRING DIAGRAMS article.
5. If scan tool displays an error message, RAM TEST FAILURE, CARTRIDGE ERROR, KEY PAD TEST FAILURE, or LOW OR HIGH BATTERY, this indicates a scan tool failure. To diagnose and correct these conditions, see appropriate VEHICLE COMMUNICATIONS article in ACCESSORIES & EQUIPMENT section.
6. On all applications, if DTCs are displayed, see DTC MESSAGES & CODES table and perform appropriate test(s). If no DTCs are displayed, refer to one of the following: For driveability problems, perform TEST NTC-1A. For no-start problems, perform TEST NS-SEL. For speed control problems, refer to appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT section. For charging system problems, refer to appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS section.

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

Note. Breaks in testing sequence occur when tests do not apply to this model.

DTC MESSAGES & CODES

TEST TC-1A - NO CAM SIGNAL AT PCM

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, erase DTCs. Attempt to start engine. If engine will not start, crank engine for up to 15 seconds. Using scan tool, read DTCs. If scan tool displays NO CAM SIGNAL AT PCM, go to next step. If scan tool does not display NO CAM SIGNAL AT PCM, perform TEST TC-1C.
2. Turn ignition off. Disconnect CMP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
3. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of CMP sensor connector, ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
4. Turn ignition on. Using scan tool in voltmeter mode, check voltage on CMP connector, 5-volt supply circuit (White/Black wire). If voltage is 4 volts or less, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is more than 4 volts, go to next step.
5. Connect one end of a jumper wire to CMP connector, signal circuit (Gray/Black wire). Using scan tool, select SENSORS and read current CMP count. While observing scan tool display, touch other end of jumper wire to CMP connector, ground circuit (Black/Light Blue wire). If count does not change, perform TEST TC-1B. If count changes, go to next step.
6. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
7. Using an external ohmmeter, check resistance of signal circuit (Gray/Black wire) between CMP sensor connector and PCM Black connector. If resistance is 5 ohms or more, repair open signal circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
8. Check resistance between CMP sensor connector signal circuit (Gray/Black wire) and CMP sensor connector ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, repair signal circuit for a short to ground circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
9. Check resistance between ground and CMP sensor connector signal circuit (Gray/Black wire). If resistance is 5 ohms or more, repair signal circuit for a short to ground and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
10. Check resistance between CMP sensor connector signal circuit (Gray/Black wire) and CMP sensor connector 5-volt supply circuit (Violet/White wire). If resistance is 5 ohms or more, repair signal circuit for a short to 5-volt supply circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

TEST TC-1B - NO CAM SIGNAL AT PCM

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Remove distributor cap and observe distributor rotor while cranking engine. If rotor does not turn, repair distributor drive system as necessary and perform TEST VER-2A. If rotor turns, replace CMP sensor and perform TEST VER-2A.
2. Remove CMP sensor and inspect camshaft sprocket. Repair camshaft sprocket as necessary and perform TEST VER-2A. If camshaft sprocket is okay, replace CMP sensor and perform TEST VER-2A.

TEST TC-1C - NO CAM SIGNAL AT PCM

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Attempt to start engine. If engine does not start, perform TEST NS-SEL. If engine starts, go to next step.
2. Condition required to set DTC is not present at this time. NO CAM SIGNAL AT PCM DTC sets if Powertrain Control Module (PCM) does not see a CMP sensor signal with crankshaft position sensor signal present. Possible causes are: open or shorted 5-volt supply circuit, open sensor ground, open or shorted signal circuit, excessive clearance between sensor and sprocket, damaged pulse ring or sprocket, defective sensor, or defective PCM. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-1C to TEST TC-5A. No tests have been omitted.

TEST TC-5A - CHARGING SYSTEM VOLTAGE TOO LOW

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Ensure battery is fully charged and generator belt tension and condition are okay. Start engine. Using scan tool, read TARGET CHARGING VOLTAGE. If voltage is 15.1 volts or less, go to step 5). If voltage is more than 15.1 volts, go to next step.
2. Using scan tool, read battery temperature sensor temperature. Using a thermometer, read underhood temperature. If scan tool reading and thermometer reading are within 10 percent of each other, go to step 5). If temperatures are not within 10 percent of each other, go to next step.
3. Disconnect battery temperature sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
4. Connect a jumper wire across battery temperature sensor terminals. Using scan tool, read battery temperature sensor voltage. If voltage is zero, replace battery temperature sensor and perform TEST VER-2A. If any voltage exists, replace powertrain control module and perform TEST VER-2A.
5. If vehicle is equipped with a diesel engine and diesel engine does not run, perform TEST TC-40A. If vehicle is not equipped with a diesel engine or if diesel engine runs, go to next step. CAUTION: If vehicle is equipped with a diesel engine, DO NOT perform any charging system tests with intake heaters on.
6. Using an external voltmeter, connect one voltmeter lead to B+ (battery) terminal on rear of generator. Connect other voltmeter lead to positive battery terminal. Go to next step. CAUTION: Ensure all wires are clear of any moving engine parts.
7. Start engine and note voltage reading on voltmeter. If voltage is more than 0.4 volt, repair B+ circuit between battery and generator for high resistance and perform TEST VER-2A. If voltage is 0.4 volt or less, go to next step.
8. Turn ignition off. Using external voltmeter, connect one voltmeter lead to generator case. Connect other voltmeter lead to negative battery terminal. Go to next step.
9. Start engine and allow to reach operating temperature. Note voltage reading on voltmeter. If voltage is more than 0.1 volt, repair generator ground circuit between battery and generator for high resistance and perform TEST VER-2A. If voltage is 0.1 volt or less, go to next step.
10. Maintain engine speed at 1600 RPM. Using scan tool, read target charging voltage and charging voltage. Compare readings. If difference between readings is more than one volt, repair or replace generator as necessary and perform TEST VER-2A. If difference between readings is one volt or less, go to next step.
11. Allow engine to idle. Turn engine off, ignition on. Read and record DTCs. Clear DTCs. Charging system is operating properly at this time. See INACTIVE DTC CONDITION. Test is complete.

TEST TC-6A - CHARGING SYSTEM VOLTAGE TOO HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition on. Using scan tool, actuate generator field driver. Using an external voltmeter, backprobe field driver circuit (Dark Green wire) in 2-wire connector on rear of generator. If voltage cycles from low voltage to high voltage, perform TEST TC-6B. If voltage does not cycle from low voltage to high voltage, go to next step.
2. Using scan tool, stop generator field driver actuation. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
3. Disconnect 2-wire connector on rear of generator. Using an external ohmmeter, check resistance between ground and PCM White connector, field driver circuit (Dark Green wire). If resistance is less than 5 ohms, repair short to ground in field driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
4. Check resistance of field driver terminal in generator (Dark Green wire). If resistance is less than 5 ohms, repair or replace generator and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.

TEST TC-6B - CHARGING SYSTEM VOLTAGE TOO HIGH

Note. Perform TEST TC-6A before proceeding.

1. Using scan tool, stop generator field driver actuation. Note target charging voltage. If any voltage is present, go to step 3). If no voltage is present, go to next step.
2. Using scan tool, read battery temperature sensor temperature. Using a thermometer, read underhood temperature. If temperatures are within 10 percent of each other, replace Powertrain Control Module (PCM) and perform TEST VER-2A. If temperatures are not within 10 percent of each other, go to next step.
3. Start engine and maintain engine speed at 1600 RPM. Using scan tool, read target charging voltage and charging voltage. Compare readings for 5 minutes. If difference between readings is more than one volt, replace PCM and perform TEST VER-2A. If difference between readings is one volt or less, go to next step.
4. Allow engine to idle. Turn engine off, ignition on. Read and record DTCs. Clear DTCs. Charging system is operating properly at this time. See INACTIVE DTC CONDITION. Test is complete.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-6B to TEST TC-10A. No tests have been omitted.

TEST TC-10A - AUTO SHUTDOWN RELAY CONTROL CIRCUIT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, actuate Auto Shutdown (ASD) relay. Listen for clicking sound at ASD relay. If no clicking sound is heard at ASD relay, go to step 6). If clicking sound is heard at ASD relay, go to next step.
2. Condition required to set DTC is not present at this time. AUTO SHUTDOWN RELAY CONTROL CIRCUIT DTC sets if Powertrain Control Module (PCM) detects an open or shorted condition in ASD relay control circuit. Possible causes are: open or shorted relay coil, open fused ignition output circuit, open or shorted ASD relay control circuit, defective PCM, defective connector terminals or connector wires. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, start engine. If vehicle is equipped with a diesel engine, go to step 5). Go to next step.
4. Wiggle wiring harness from ASD relay to PCM. If engine stalls while wiggling wiring harness, repair wiring as necessary and perform TEST VER-2A. If engine does not stall, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Disconnect intake air temperature heater relay control connector. Turn headlights on and wiggle wiring harness from ASD relay to PCM. If headlights flicker while wiggling wiring harness, repair wiring as necessary and perform TEST VER-2A. If headlights do not flicker, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
6. Remove ASD relay from power distribution center. Using scan tool in voltmeter mode, check voltage on ASD relay connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is 10 volts or less, repair open in fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
7. Using an external ohmmeter, check resistance between ASD relay terminals No. 85 and 86. (Scheme 41) If resistance is 100 ohms or more, replace ASD relay and perform TEST VER-2A. If resistance is less than 100 ohms, go to next step.
8. Ensure ignition is off. Disconnect Powertrain Control Module (PCM) Gray connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
9. Check resistance between ground and PCM Gray connector, ASD relay control circuit (Dark Blue/Yellow wire). If resistance is less than 5 ohms, repair short to ground in ASD relay control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
10. Check resistance of ASD relay control circuit (Dark Blue/Yellow wire) between ASD relay connector and PCM Gray connector. If resistance is 5 ohms or more, repair open ASD relay control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

Testing Relay Terminals (Typical). Scheme 41

TEST TC-11A - GENERATOR FIELD NOT SWITCHING PROPERLY

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read and record DTCs. Erase DTCs. Inspect all related connectors for corrosion or spread terminals. If connectors are okay, go to next step.
2. Using scan tool, actuate generator field driver circuit. Using scan tool in voltmeter mode, backprobe generator field source circuit in 2-wire connector on rear of generator. See GENERATOR FIELD SOURCE CIRCUIT IDENTIFICATION table. If voltage is 10 volts or less, repair open in generator field source circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step. GENERATOR FIELD SOURCE CIRCUIT IDENTIFICATION Application Wire Color BR Body White/Dark Blue
3. Backprobe field driver circuit (Dark Green wire) in 2-wire connector on rear of generator. If voltage does not cycle from low voltage to high voltage, go to step 7). If voltage cycles from low voltage to high voltage, go to next step.
4. Condition required to set DTC is not present at this time. GENERATOR FIELD NOT SWITCHING PROPERLY DTC sets if Powertrain Control Module (PCM) tries to regulate generator field with no result. Possible causes are: open or shorted wiring, defective connectors, defective generator or PCM. Go to next step.
5. Inspect all related wiring and connectors. Repair wiring and connections as necessary and perform TEST VER-3A. If wiring and connections are okay, go to next step.
6. Ensure actuator test is still running. Using scan tool, check for DTCs. Wiggle wiring harness from generator to PCM and note if GENERATOR FIELD NOT SWITCHING PROPERLY DTC resets. If DTC resets, repair wiring harness as necessary and perform TEST VER-3A. If DTC does not reset, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-3A.
7. Using scan tool, stop generator field driver actuation. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-3A. If connectors and terminals are okay, go to next step.
8. Disconnect 2-wire connector on rear of generator. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-3A. If connector and terminals are okay, go to next step.
9. Using an external ohmmeter, check resistance of generator field driver circuit (Dark Green wire) between PCM White connector and generator 2-wire connector. If resistance is 5 ohms or more, repair open generator field driver circuit between PCM and generator and perform TEST VER-3A. If resistance is less than 5 ohms, go to next step.
10. Ensure 2-wire connector on rear of generator is disconnected. Using external ohmmeter, check resistance across terminals that 2-wire connector fits on at rear of generator. If resistance is 5 ohms or more, repair or replace generator as necessary and perform TEST VER-3A. If resistance is less than 5 ohms, go to next step.
11. Check resistance between ground and generator field driver circuit (Dark Green wire) in generator 2-wire connector. If resistance is less than 5 ohms, repair short to ground in field driver circuit and perform TEST VER-3A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-3A.

TEST TC-12A - TORQUE CONVERTER CLUTCH (TCC) SOLENOID/TRANS RELAY CKT

Note. Test applies to vehicles equipped with automatic transmission only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. If vehicle is not equipped with 4-speed Electronic Automatic Transmission (EATX), perform TEST TC-12E. If vehicle is equipped with 4-speed EATX, go to next step.
2. If TRANS 12 VOLT SUPPLY RELAY CNTRL CIRCUIT DTC is also set, perform TEST TC-173A. If TRANS 12 VOLT SUPPLY RELAY CNTRL CIRCUIT DTC IS NOT SET, use scan tool to perform TCC SYSTEM TEST. If engine does not stall, go to step 6). If engine stalls, go to next step.
3. Condition required to set DTC is not present at this time. TCC SOLENOID CIRCUIT DTC sets if an open or shorted circuit exists in TCC solenoid circuit. Possible causes are: open or shorted wiring to TCC solenoid, open fused ignition switch output circuit, defective connector terminals, or defective TCC solenoid. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connections as necessary and perform TEST VER-2A. If wiring is okay, go to next step.
5. Using scan tool, clear DTCs. Actuate TCC solenoid and check for DTCs. Wiggle wiring harness from TCC solenoid to PCM and note if TCC SOLENOID CIRCUIT DTC resets. If DTC resets, repair wiring harness as necessary and perform TEST VER-2A. If DTC does not reset, see INACTIVE DTC CONDITION. Test is complete.
6. Turn ignition off. Disconnect Transmission (TRANS) solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
7. Turn ignition on. Using scan tool, actuate TRANS control relay and check voltage on TRANS solenoid connector, TRANS relay output circuit (Red wire). If voltage does not cycle from zero to more than 10 volts, perform TEST TC-12B. If voltage cycles from zero to more than 10 volts, go to next step.
8. Turn ignition off. Disconnect Powertrain Control Module (PCM) White connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
9. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM White connector, TCC solenoid control circuit (Orange/Black wire). If voltage is more than 10 volts, perform TEST TC-12B. If voltage is 10 volts or less, go to next step.
10. Turn ignition off. Using an external ohmmeter, check resistance between ground and PCM White connector, TCC solenoid control circuit (Orange/Black wire). If resistance is less than 5 ohms, repair TCC solenoid control circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
11. Reconnect TRANS solenoid connector. Check resistance between ground and PCM White connector, solenoid control circuit (Orange/Black wire). If resistance is less than 5 ohms, replace TRANS solenoid and harness assembly and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
12. Remove TRANS control relay. Inspect relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
13. Check resistance between TRANS control relay connector, TRANS control relay output circuit (Red wire) and PCM White connector, TCC solenoid control circuit (Orange/Black wire). If resistance is 26-40 ohms, replace PCM and perform TEST VER-2A. If resistance is more than 40 ohms, go to next step. If resistance is less than 26 ohms, perform TEST TC-12C.
14. Disconnect TRANS solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
15. Check resistance of TCC solenoid control circuit (Orange/Black wire) between PCM White connector and TRANS solenoid connector. If resistance is 5 ohms or more, repair open TCC solenoid control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace TRANS solenoid and harness assembly and perform TEST VER-2A.

TEST TC-12B - TORQUE CONVERTER CLUTCH (TCC) SOLENOID/TRANS RELAY CKT

Note. Perform TEST TC-12A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Remove Transmission (TRANS) control relay. Inspect relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Turn ignition off. Check resistance between ground and TRANS control relay connector, TRANS control relay output circuit (Red wire). If resistance is 5 ohms or more, repair short to ground in TRANS control relay output circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
3. Check resistance of TRANS control relay output circuit (Red wire) between TRANS control relay connector and TRANS solenoid connector. If resistance is more than 5 ohms, repair open TRANS control relay output circuit and perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
4. Turn ignition on. Using scan tool, check voltage on TRANS control relay connector, B+ circuit (Red/White wire). If voltage is 10 volts or less, repair open fused B+ circuit and perform TEST VER-2A. If resistance is more than 10 volts, replace TRANS control relay and perform TEST VER-2A.

TEST TC-12C - TORQUE CONVERTER CLUTCH (TCC) SOLENOID/TRANS RELAY CKT

Note. Perform TEST TC-12A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Transmission (TRANS) solenoid connector and Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check and record resistance between TCC solenoid connector, TCC solenoid control circuit (Orange/Black wire) and all other circuits in TCC solenoid connector. If resistance is less than 5 ohms between any two circuits, repair TCC solenoid control circuit for short to other circuit(s). Reconnect all connectors and go to step 4). If resistance is 5 ohms or more between all circuits, go to next step.
3. Replace TRANS solenoid and harness inside transmission. Reconnect all connectors. Perform TEST VER-2A and go to next step.
4. Using scan tool, perform TCC SYSTEM TEST. If engine does not stall, replace PCM and perform TEST VER-2A. If engine stalls, TCC system is operating properly. Test is complete.

TEST TC-12D - TORQUE CONVERTER CLUTCH (TCC) SOLENOID/TRANS RELAY CKT

Note. Perform TEST TC-12A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Repair TCC solenoid control circuit (Orange/Black wire) for short to voltage. Perform TEST VER-2A and go to next step.
2. Reconnect all connectors. Using scan tool, perform TCC SYSTEM TEST. If engine does not stall, replace PCM and perform TEST VER-2A. If engine stalls, TCC system is operating properly. Test is complete.

TEST TC-12E - TORQUE CONVERTER CLUTCH (TCC) SOLENOID/TRANS RELAY CKT

Note. Perform TEST TC-12A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Ensure ignition is off. Disconnect Transmission (TRANS) solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Turn ignition on. Using scan tool in voltmeter mode, check voltage on TCC solenoid connector, fused ignition switch output circuit. If voltage is less than 10 volts, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is 10 volts or less, go to next step.
3. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
4. Using an external ohmmeter, check resistance between ground and TCC solenoid connector, TCC solenoid control circuit. If resistance is less than 5 ohms, repair TCC solenoid control circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
5. Check resistance of TCC solenoid control circuit between TCC solenoid connector and PCM White connector. If resistance is 5 ohms or more, repair open TCC solenoid control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
6. Reconnect TCC solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM White connector, TCC solenoid control circuit. If voltage is 5 volts or less, replace TCC solenoid and perform TEST VER-2A. If voltage is more than 5 volts, replace PCM and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-12E to TEST TC-14A. No tests have been omitted.

TEST TC-15A - SPEED CONTROL SOLENOID CIRCUITS

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, actuate Speed Control (S/C) vent solenoid. If vent solenoid does not click, go to step 7). If vent solenoid clicks, go to next step.
2. Wiggle wiring harness from S/C servo and brakelight switch to Powertrain Control Module (PCM). Ensure scan tool is still actuating S/C vent solenoid. If vent solenoid stops actuating while wiggling wiring harness, repair wiring as necessary and perform TEST VER-4A. If vent solenoid continues actuating, go to next step.
3. Actuate S/C vacuum solenoid. If vacuum solenoid does not click, go to step 7). If vacuum solenoid clicks, go to next step.
4. Wiggle wiring harness from S/C servo and brakelight switch to Powertrain Control Module (PCM). Ensure scan tool is still actuating S/C vacuum solenoid. If vacuum solenoid stops actuating while wiggling wiring harness, repair wiring as necessary and perform TEST VER-4A. If vacuum solenoid continues actuating, go to next step.
5. Condition required to set DTC is not present at this time. SPEED CONTROL SOLENOID CIRCUITS DTC sets if Powertrain Control Module (PCM) actuates S/C vacuum and vent solenoids but they do not respond. Possible causes are: open or shorted solenoid control circuit, open or shorted S/C vacuum or vent solenoid, open or shorted S/C power supply circuit, or defective PCM. Go to next step.
6. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-4A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A. NOTE: DO NOT depress brake pedal during following steps.
7. Turn ignition on, engine off. Turn S/C switch on. Disconnect S/C servo 4-pin connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-4A. If connector and terminals are okay, go to next step.
8. Using scan tool in voltmeter mode, check voltage on S/C servo 4-pin connector, switched S/C power supply circuit (Dark Blue/Red wire). If voltage is more than 10 volts, go to step 13). If voltage is 10 volts or less, go to next step.
9. Turn ignition off. Using scan tool in ohmmeter mode, check resistance between ground and S/C servo 4-pin connector, switched S/C power supply circuit (Dark Blue/Red wire). If resistance is less than 5 ohms, repair short to ground in switched S/C power supply circuit and perform TEST VER-4A. If resistance is 5 ohms or more, go to next step.
10. Disconnect brakelight switch connector. Turn ignition on, engine off. Using scan tool in voltmeter mode, check voltage on brakelight switch connector, S/C (ON/OFF switch sense) power supply circuit (Yellow/Red wire). If voltage is 10 volts or less, perform TEST TC-15B. If voltage is more than 10 volts, go to next step.
11. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-4A. If connectors and terminals are okay, go to next step.
12. Using scan tool in ohmmeter mode, check resistance of switched S/C power supply circuit (Dark Blue/Red wire) between PCM Gray connector and S/C servo 4-pin connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-4A. If resistance is 5 ohms or more, repair open switched S/C power supply circuit and perform TEST VER-4A.
13. Turn ignition off. Using an external ohmmeter, check resistance between ground and S/C servo 4-pin connector, ground circuit (Black/White wire on BR body; Black wire on all other bodies). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
14. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-4A. If connectors and terminals are okay, go to next step.
15. Using an external ohmmeter, check resistance of S/C vacuum solenoid control circuit (Tan/Red wire) between PCM Gray connector and S/C servo 4-pin connector. If resistance is 5 ohms or more, repair open S/C vacuum solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
16. Check resistance of S/C vent solenoid control circuit (Light Green/Red wire) between PCM Gray connector and S/C servo 4-pin connector. If resistance is 5 ohms or more, repair open S/C vent solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
17. Check resistance between ground and S/C servo 4-pin connector,S/C vacuum solenoid control circuit (Tan/Red wire). If resistance is 5 ohms or more, repair short to ground in S/C vacuum solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
18. Check resistance between ground and S/C servo 4-pin connector,S/C vent solenoid control circuit (Light Green/Red wire). If resistance is 5 ohms or more, repair short to ground in S/C vent solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, replace S/C servo and perform TEST VER-4A.

TEST TC-15B - SPEED CONTROL SOLENOID CIRCUITS OR SPEED CONTROL POWER RELAY CIRCUITS

Note. Perform TEST TC-15A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Using an external ohmmeter, check resistance of switched S/C power supply circuit (Dark Blue/Red wire) between brake light switch connector and S/C servo connector. If resistance is more than 5 ohms, repair open switched S/C power supply circuit and perform TEST VER-4A. If resistance is 5 ohms or less, go to next step.
2. Check brakelight switch adjustment. Adjust brakelight switch as necessary and perform TEST VER-4A. If brakelight switch is adjusted properly, replace brakelight switch and perform TEST VER-4A.

TEST TC-16A - A/C CLUTCH RELAY CIRCUIT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, actuate A/C clutch relay. Listen for clicking sound at A/C clutch relay. If no clicking sound is heard at A/C clutch relay, go to step 5). If clicking sound is heard at ASD relay, go to next step.
2. Condition required to set DTC is not present at this time. A/C CLUTCH RELAY CIRCUIT DTC sets if Powertrain Control Module (PCM) detects an open or shorted condition in A/C clutch relay control circuit. Possible causes are: open or shorted relay coil, open fused ignition output circuit, open or shorted A/C clutch relay control circuit, defective PCM, defective connector terminals or connector wires. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
4. Wiggle wiring harness from A/C clutch relay to PCM. Ensure scan tool is still actuating A/C clutch relay. If A/C clutch relay stops clicking, repair wiring harness as necessary and perform TEST VER-2A. If A/C clutch relay continues clicking, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Remove A/C clutch relay. Inspect relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Turn ignition on. Using an external voltmeter, check voltage on A/C clutch relay connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
7. Turn ignition off. Using an external ohmmeter, check resistance between A/C clutch relay terminals No. 85 and 86. (Scheme 41) If resistance is 100 ohms or more, replace A/C clutch relay and perform TEST VER-2A. If resistance is less than 100 ohms, go to next step.
8. Ensure ignition is off. Disconnect Powertrain Control Module (PCM) Gray connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
9. Check resistance between ground and PCM Gray connector, A/C compressor clutch relay control circuit (Dark Blue/Orange wire). If resistance is less than 5 ohms, repair short to ground in A/C compressor clutch relay control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
10. Check resistance of A/C compressor clutch relay control circuit (Dark Blue/Orange) between A/C clutch relay connector and PCM Gray connector. If resistance is 5 ohms or more, repair open A/C compressor clutch relay control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

TEST TC-17A - EGR SOLENOID CIRCUIT

Note. This test applies to BR body vehicles equipped with diesel engine only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool erase DTCs and actuate EGR solenoid. If EGR solenoid does not click, go to step 5). If EGR solenoid clicks, go to next step.
2. Condition required to set DTC is not present at this time. EGR SOLENOID CIRCUIT DTC sets if an open or shorted circuit exists in EGR solenoid and EGR solenoid does not operate when activated by PCM. Possible causes are: open or shorted wiring to EGR solenoid, defective EGR solenoid or PCM. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
4. Using scan tool, read DTCs. Ensure actuator test is still running. Wiggle wiring harness from EGR solenoid to PCM and note if EGR SOLENOID CIRCUIT DTC resets, repair wiring harness as necessary and perform TEST VER-2A. If DTC does not reset, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Ensure ignition is off. Disconnect EGR solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Turn ignition on. Using an external voltmeter, check voltage on EGR solenoid connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
8. Using scan tool in ohmmeter mode, check resistance of EGR solenoid control circuit (Gray/Yellow wire) between EGR solenoid connector and PCM White connector. If resistance is 5 ohms or more, repair open EGR solenoid control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
9. Using an external ohmmeter, check resistance between ground and EGR solenoid connector, EGR solenoid control circuit (Gray/Yellow wire). If resistance is less than 5 ohms, repair short to ground in EGR solenoid control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
10. Reconnect EGR solenoid connector. Turn ignition on. Using an external voltmeter, check voltage on PCM White connector, EGR solenoid control circuit (Gray/Yellow wire). If voltage is 10 volts or less, replace EGR solenoid and perform TEST VER-2A. If voltage is more than 10 volts, replace PCM and perform TEST VER-2A.

TEST TC-18A - EVAP PURGE SOLENOID CIRCUIT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool read and record DTCs. Erase DTCs and monitor PURGE SOLENOID STATE. Start engine and allow it to reach normal operating temperature. Disconnect EVAP purge solenoid vacuum hose (between EVAP purge solenoid and EVAP canister). If vacuum does not exist when scan tool displays DUTY CYCLE MORE THAN 0 PERCENT, go to step 5). If vacuum exists in hose when scan tool displays DUTY CYCLE MORE THAN 0 PERCENT, go to next step.
2. Condition required to set DTC is not present at this time. EVAP PURGE SOLENOID CIRCUIT DTC sets if actual state of EVAP purge solenoid operation does not match intended state. Possible causes are: open or shorted wiring to EVAP purge solenoid, defective EVAP purge solenoid or PCM. Go to next step.
3. Check for defective wiring and connections at EVAP purge solenoid, PCM and fused voltage supply wiring to EVAP purge solenoid. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
4. Using scan tool, read DTCs. Ensure actuator test is still running. Wiggle wiring harness from EVAP purge solenoid to PCM. If EVAP PURGE SOLENOID CIRCUIT DTC resets, repair wiring harness as necessary and perform TEST VER-2A. If DTC does not reset, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Turn ignition off. Disconnect EVAP purge solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Turn ignition on. Using an external voltmeter, check voltage on EVAP purge solenoid connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance of EVAP purge solenoid control circuit (Pink wire) between EVAP purge solenoid connector and PCM Gray connector. If resistance is 5 ohms or more, repair open EVAP purge solenoid control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
9. Check resistance between ground and PCM Gray connector, EVAP purge solenoid control circuit (Pink wire on BR body; Pink/Black wire on all other bodies). If resistance is less than 5 ohms, repair short to ground in EVAP purge solenoid control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
10. Reconnect EVAP purge solenoid connector. Turn ignition on. Using an external voltmeter, check voltage on PCM Gray connector, EVAP purge control solenoid circuit (Pink wire on BR body; Pink/Black wire on all other bodies). If voltage is 10 volts or less, replace EVAP purge solenoid and perform TEST VER-2A. If voltage is more than 10 volts, replace PCM and perform TEST VER-2A.

TEST TC-19A - INJECTOR #3 CONTROL CIRCUIT

Note. Perform TEST TC-21A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect injector No. 3 electrical connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance across injector No. 3 terminals. If resistance is not 10-16 ohms, replace injector and perform TEST VER-2A. If resistance is 10-16 ohms, go to next step.
3. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Using an external voltmeter, check voltage on injector No. 3 connector, ASD relay output circuit (Dark Green/Orange wire). If voltage does not cycle from high voltage to low voltage, repair open ASD relay output circuit and perform TEST VER-2A. If voltage cycles from high voltage to low voltage, go to next step.
4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and PCM White connector, injector No. 3 driver circuit (Yellow/White wire). If resistance is less than 5 ohms, repair short to ground in injector No. 3 driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. Check resistance of injector No. 3 driver circuit (Yellow/White wire) between injector No. 3 connector and PCM White connector. If resistance is 5 ohms or more, repair open injector No. 3 driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

TEST TC-20A - INJECTOR #2 CONTROL CIRCUIT

Note. Perform TEST TC-21A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect injector No. 2 electrical connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance across injector No. 2 terminals. If resistance is not 10-16 ohms, replace injector and perform TEST VER-2A. If resistance is 10-16 ohms, go to next step.
3. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Using an external voltmeter, check voltage on injector No. 2 connector, ASD relay output circuit (Dark Green/Orange wire). If voltage does not cycle from high voltage to low voltage, repair open ASD relay output circuit and perform TEST VER-2A. If voltage cycles from high voltage to low voltage, go to next step.
4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and PCM White connector, injector No. 2 driver circuit (Tan wire). If resistance is less than 5 ohms, repair short to ground in injector No. 2 driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. Check resistance of injector No. 2 driver circuit (Tan wire) between injector No. 2 connector and PCM White connector. If resistance is 5 ohms or more, repair open injector No. 2 driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

TEST TC-21A - INJECTOR CONTROL CIRCUITS

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Start engine and allow to idle for at least 20 seconds. Turn engine off. Turn ignition on, engine off. DO NOT restart engine. Go to next step.
2. Using scan tool, read DTCs. If scan tool displays any INJECTOR CONTROL CIRCUIT with a start run count of zero, perform appropriate test. See INJECTOR CONTROL CIRCUIT TESTS table. If scan tool does not display any INJECTOR CONTROL CIRCUIT with a start run count of zero, go to next step. INJECTOR CONTROL CIRCUIT TESTS Scan Tool Display Test INJECTOR #1 CONTROL CIRCUIT TC-21B INJECTOR #2 CONTROL CIRCUIT TC-20A INJECTOR #3 CONTROL CIRCUIT TC-19A INJECTOR #4 CONTROL CIRCUIT TC-61A INJECTOR #5 CONTROL CIRCUIT TC-69A INJECTOR #6 CONTROL CIRCUIT TC-70A INJECTOR #7 CONTROL CIRCUIT TC-79A INJECTOR #8 CONTROL CIRCUIT TC-80A INJECTOR #9 CONTROL CIRCUIT TC-55A INJECTOR #10 CONTROL CIRCUIT TC-56A
3. Condition required to set DTC is not present at this time. INJECTOR CONTROL CIRCUIT DTC is set if no inductive activation is sensed by Powertrain Control Module (PCM) after injector turns off, and with no other injectors on. Possible causes are: open or shorted injector wiring, defective Auto Shutdown (ASD) relay wiring circuit to injector, defective connections, open injector or defective PCM. Go to next step.
4. Check for defective wiring and connections at injectors, ASD relay and PCM. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
5. Start engine. Wiggle wiring harness from injectors to PCM. If engine misfires or stalls, repair wiring harness as necessary and perform TEST VER-2A. If engine does not misfire or stall, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.

TEST TC-21B - INJECTOR #1 CONTROL CIRCUIT

Note. Perform TEST TC-21A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect injector No. 1 electrical connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance across injector No. 1 terminals. If resistance is not 10-16 ohms, replace injector and perform TEST VER-2A. If resistance is 10-16 ohms, go to next step.
3. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Using an external voltmeter, check voltage on injector No. 1 connector, ASD relay output circuit (Dark Green/Orange wire). If voltage does not cycle from high voltage to low voltage, repair open ASD relay output circuit and perform TEST VER-2A. If voltage cycles from high voltage to low voltage, go to next step.
4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and PCM White connector, injector No. 1 driver circuit (White/Dark Blue wire). If resistance is less than 5 ohms, repair short to ground in injector No. 1 driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. Check resistance of injector No. 1 driver circuit (White/Dark Blue wire) between injector No. 1 connector and PCM White connector. If resistance is 5 ohms or more, repair open injector No. 1 driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-21B to TEST TC-25A. No tests have been omitted.

TEST TC-25A - IDLE AIR CONTROL MOTOR CIRCUITS

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Ensure ignition is off for at least 10 seconds. Start engine and allow it to idle for 20 seconds. If engine will not idle, hold throttle slightly open to keep engine running. Go to next step.
2. Using scan tool, actuate Idle Air Control (IAC) motor to 1400 RPM. If engine speed is not 1300-1500 RPM, go to step 8). If engine speed is 1300-1500 RPM, go to next step.
3. Using scan tool, actuate IAC motor to 900 RPM. If engine speed is not 800-1000 RPM, go to step 8). If engine speed is 800-1000 RPM, go to next step.
4. Condition required to set DTC is not present at this time. IDLE AIR CONTROL MOTOR CIRCUITS DTC sets if Powertrain Control Module (PCM) senses a short to ground or battery voltage on any of 4 IAC motor driver circuits while IAC motor is operating. PCM cannot detect an open circuit or stuck IAC motor. Possible causes are: grounded or shorted IAC motor wiring, defective connections, defective IAC motor or PCM. Go to next step.
5. Check for defective wiring and connections at IAC motor and PCM. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
6. Start engine and allow it to reach normal operating temperature. Using scan tool, actuate IAC wiggle test. Engine speed should increase and decrease in accordance with scan tool display. If engine speed does not operate correctly, go to step 8). If engine speed operates correctly, go to next step.
7. Wiggle wiring harness from IAC motor to PCM. If IAC motor stops operating while moving wiring harness, repair wiring as necessary and perform TEST VER-2A. If IAC motor does not stop operating, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
8. Using scan tool, stop all tests. Turn ignition off. Disconnect IAC motor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
9. Using an external ohmmeter, check resistance between ground and IAC motor connector, driver No. 1 circuit (Gray/Red wire). If resistance is less than 5 ohms, repair short to ground in driver No. 1 circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
10. Check resistance between ground and IAC motor connector, driver No. 2 circuit (Yellow/Black wire). If resistance is less than 5 ohms, repair short to ground in driver No. 2 circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
11. Check resistance between ground and IAC motor connector, driver No. 3 circuit (Brown/White wire). If resistance is less than 5 ohms, repair short to ground in driver No. 3 circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
12. Check resistance between ground and IAC motor connector, driver No. 4 circuit (Violet//Black wire). If resistance is less than 5 ohms, repair short to ground in driver No. 4 circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step. NOTE: Voltage may switch or remain constant in steps 13)-16).
13. Reconnect IAC connector. Start engine and allow it to idle. Disconnect IAC connector. With engine still running, use an external voltmeter to check voltage on IAC motor connector, driver No. 1 circuit (Gray/Red wire). If voltage is not more than 5 volts at any time, perform TEST TC-25B. If voltage is more than 5 volts at any time, go to next step.
14. Check voltage on IAC motor connector, driver No. 2 circuit (Yellow/Black wire). If voltage is not more than 5 volts at any time, perform TEST TC-25C. If voltage is more than 5 volts at any time, go to next step.
15. Check voltage on IAC motor connector, driver No. 3 circuit (Brown/White wire). If voltage is not more than 5 volts at any time, perform TEST TC-25D. If voltage is more than 5 volts at any time, go to next step.
16. Check voltage on IAC motor connector, driver No. 4 circuit (Violet/Black wire). If voltage is not more than 5 volts at any time, perform TEST TC-25E. If voltage is more than 5 volts any time, go to next step.
17. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step. NOTE: Steps 18)-21) check for short circuits between IAC motor driver circuits.
18. Using an external ohmmeter, check resistance between IAC motor connector, driver No. 1 circuit (Gray/Red wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-2A. If resistance is 5 ohms or more on all IAC motor driver circuits, go to next step.
19. Check resistance between IAC motor connector, driver No. 2 circuit (Yellow/Black wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-2A. If resistance is 5 ohms or more on all IAC motor driver circuits, go to next step.
20. Check resistance between IAC motor connector, driver No. 3 circuit (Brown/White wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-2A. If resistance is 5 ohms or more on all IAC motor driver circuits, go to next step.
21. Check resistance between IAC motor connector, driver No. 4 circuit (Violet/Black wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-2A. If resistance is 5 ohms or more, replace IAC motor and perform TEST VER-2A.

TEST TC-25B - IDLE AIR CONTROL MOTOR CIRCUITS

Note. Perform TEST TC-25A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of IAC motor connector, driver No. 1 circuit (Gray/Red wire) between IAC motor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open driver No. 1 circuit and perform TEST VER-2A.

TEST TC-25C - IDLE AIR CONTROL MOTOR CIRCUITS

Note. Perform TEST TC-25A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of IAC motor connector, driver No. 2 circuit (Yellow/Black wire) between IAC motor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open driver No. 2 circuit and perform TEST VER-2A.

TEST TC-25D - IDLE AIR CONTROL MOTOR CIRCUITS

Note. Perform TEST TC-25A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of IAC motor connector, driver No. 3 circuit (Brown/White wire) between IAC motor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open driver No. 3 circuit and perform TEST VER-2A.

TEST TC-25E - IDLE AIR CONTROL MOTOR CIRCUITS

Note. Perform TEST TC-25A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of IAC motor connector, driver No. 4 circuit (Violet/Black wire) between IAC motor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open driver No. 4 circuit and perform TEST VER-2A.

TEST TC-26A - THROTTLE POSITION SENSOR VOLTAGE LOW

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition on. Using scan tool, read Throttle Position (TP) sensor voltage. If voltage is less than 0.2 volt, go to step 7). If voltage is 0.2 volt or more, go to next step.
2. While monitoring TP sensor voltage, slowly open and close throttle. If voltage does not change smoothly, replace TP sensor and perform TEST VER-2A. If voltage changes smoothly, release throttle and go to next step.
3. With throttle at closed position, wiggle wiring harness and connector going to TP sensor on throttle body while monitoring voltage. If voltage changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
4. Start engine. Wiggle wiring harness and connector going to TP sensor on throttle body while monitoring engine speed (RPM). If RPM changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-2A. If RPM does not change while wiggling wiring harness, go to next step.
5. Condition required to set DTC is not present at this time. THROTTLE POSITION SENSOR VOLTAGE LOW DTC sets in Powertrain Control Module (PCM) if TP sensor voltage at PCM is less than 0.2 volt for .704 second or if vehicle speed is more than 20 MPH, engine speed is more than 1500 RPM, and engine vacuum is less than 2 in. Hg with TP sensor voltage less than 0.5 volt for .704 second. Possible causes are: open or shorted TP sensor wiring, defective connections, defective TP sensor or PCM. Go to next step.
6. Inspect all related wiring and connections. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
7. Disconnect TP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Using an external voltmeter, check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is less than 4 volts, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is 4 volts or more, go to next step.
9. Using scan tool, read TP sensor voltage. If voltage is more than one volt, replace TP sensor and perform TEST VER-2A. If voltage is one volt or less, go to next step.
10. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
11. Using an external ohmmeter, check resistance between ground and TP sensor connector, signal circuit (Orange/Dark Blue wire). If resistance is less than 5 ohms, repair short to ground in signal circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
12. Check resistance between TP sensor connector, signal circuit (Orange/Dark Blue wire) and ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair signal circuit for a short to ground circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.

TEST TC-27A - THROTTLE POSITION SENSOR VOLTAGE HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition on. Using scan tool, read Throttle Position (TP) sensor voltage. If voltage is more than 4.5 volts, go to step 7). If voltage is 4.5 volts or less, go to next step.
2. While monitoring TP sensor voltage, slowly open and close throttle. If voltage does not change smoothly, replace TP sensor and perform TEST VER-2A. If voltage changes smoothly, go to next step.
3. With throttle at closed position, wiggle wiring harness and connector going to TP sensor on throttle body while monitoring voltage. If voltage changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
4. Start engine. Wiggle wiring harness and connector going to TP sensor on throttle body while monitoring engine speed (RPM). If RPM changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-2A. If RPM does not change while wiggling wiring harness, go to next step.
5. Condition required to set DTC is not present at this time. THROTTLE POSITION SENSOR VOLTAGE HIGH DTC sets in Powertrain Control Module (PCM) if TP sensor voltage at PCM is more than 4.5 volts for .704 second. Possible causes are: open TP sensor wiring or defective TP sensor. Go to next step.
6. Check for defective wiring and connections at TP sensor and PCM. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
7. Disconnect TP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Using an external voltmeter, check voltage on TP sensor connector, signal circuit (Orange/Dark Blue wire). If voltage is more than 5.5 volts, repair short to voltage in signal circuit and perform TEST VER-2A. If voltage is 5.5 volts or less, go to next step.
9. Connect a jumper wire between TP sensor connector, signal circuit (Orange/Dark Blue wire) and ground circuit (Black/Light Blue wire). Go to next step.
10. Using scan tool, read TP sensor voltage. If voltage is less than one volt, replace TP sensor and perform TEST VER-2A. If voltage is one volt or more, go to next step.
11. Remove jumper wire and reconnect jumper wire between ground and TP sensor connector, signal circuit (Orange/Dark Blue wire). Go to next step.
12. Using scan tool, read TP sensor voltage. If voltage is less than one volt, repair open ground circuit and perform TEST VER-2A. If voltage is one volt or more, go to next step.
13. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
14. Using an external ohmmeter, check resistance of signal circuit (Orange/Dark Blue wire) between TP sensor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open signal circuit and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-27A to TEST TC-30A. No tests have been omitted.

TEST TC-30A - ECT SENSOR VOLTAGE TOO LOW

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read Engine Coolant Temperature (ECT) sensor voltage. If voltage is less than 0.5 volt, go to step 5). If voltage is 0.5 volt or more, go to next step.
2. Wiggle wiring harness and connector going to ECT sensor while monitoring ECT sensor voltage. If voltage changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
3. Condition required to set DTC is not present at this time. ECT SENSOR VOLTAGE TOO LOW DTC sets if ECT sensor voltage at Powertrain Control Module (PCM) is less than 0.5 volt for more than 3 seconds. Possible causes are: defective connections or shorted ECT sensor wiring, defective ECT sensor or PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair defective wiring and connections as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Disconnect ECT sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using scan tool, read ECT sensor voltage. If voltage is more than 4 volts, replace ECT sensor and perform TEST VER-2A. If voltage is 4 volts or less, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between ground and ECT sensor connector, signal circuit (Tan/Black wire). If resistance is less than 5 ohms, repair short to ground in signal circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
9. Check resistance between ECT sensor connector, signal circuit (Tan/Black wire) and ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair signal circuit for a short to ground circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.

TEST TC-31A - ECT SENSOR VOLTAGE TOO HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read Engine Coolant Temperature (ECT) sensor voltage. If voltage is more than 4.5 volts, go to step 5). If voltage is 4.5 volts or less, go to next step.
2. Wiggle wiring harness and connector going to ECT sensor while monitoring ECT sensor voltage. If voltage changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
3. Conditions required to set DTC is not present at this time. ECT SENSOR VOLTAGE TOO HIGH DTC sets if ECT sensor voltage at Powertrain Control Module (PCM) is more than 4.5 volts for more than 3 seconds. Possible causes are: defective connections or open ECT sensor wiring, defective ECT sensor or PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair defective wiring and connections as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Disconnect ECT sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using an external voltmeter, check voltage on ECT sensor connector, signal circuit (Tan/Black wire). If voltage is more than 6 volts, repair short to voltage in signal circuit and perform TEST VER-2A. If voltage is 6 volts or less, go to next step.
7. Connect a jumper wire between ECT sensor connector, signal circuit (Tan/Black wire) and ground circuit (Black/Light Blue wire). Go to next step.
8. Remove jumper wire from ECT sensor connector. Reconnect jumper wire between ground and ECT sensor connector, signal circuit (Tan/Black wire). Go to next step.
9. Using scan tool, read ECT sensor voltage. If voltage is less than one volt, repair open ground circuit and perform TEST VER-2A. If voltage is one volt or more, go to next step.
10. Turn ignition off. Disconnect PCM connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
11. Using an external ohmmeter, check resistance of signal circuit (Tan/Black wire) between ECT sensor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open signal circuit and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-31A to TEST TC-35A. No tests have been omitted.

TEST TC-35A - NO VEHICLE SPEED SENSOR SIGNAL

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Raise and support vehicle so drive wheels are free to rotate. Start engine. Using scan tool, read Vehicle Speed Sensor (VSS) signal. Place transmission in any forward gear. If scan tool displays zero MPH, go to step 4). If scan tool displays more than zero MPH, go to next step.
2. Condition required to set DTC is not present at this time. NO VEHICLE SPEED SENSOR SIGNAL DTC sets if no VSS signal is received at Powertrain Control Module (PCM) for more than 11 seconds. Possible causes are: open or shorted VSS wiring, defective connections, defective speedometer drive gear, defective VSS or PCM. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. VSS test okay at this time. Perform TEST VER-2A.
4. With wheels still rotating, monitor speedometer. If speedometer displays more than zero MPH, perform TEST TC-35C. If speedometer displays zero MPH, go to next step.
5. Ensure VSS is properly installed. Correct VSS installation as necessary and perform TEST VER-2A. If VSS is properly installed, go to next step.
6. Turn ignition off. Disconnect VSS connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
7. Turn ignition on. Using scan tool in voltmeter mode, check voltage on VSS connector, 5-volt supply circuit (Orange wire). If voltage is 4 volts or less, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is more than 4 volts, go to next step.
8. Disconnect instrument cluster connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
9. Check voltage on VSS connector, signal circuit (White/Orange wire). If voltage is 4.5 volts or less, go to step 12). If voltage is more than 4.5 volts, go to next step.
10. Connect a jumper wire to VSS connector, signal circuit (White/Orange wire). Using scan tool, read VSS signal. Momentarily touch other end of jumper wire to VSS connector, ground circuit (Black/Light Blue wire) while monitoring VSS signal. If scan tool displays zero MPH, perform TEST TC-35B. If scan tool displays more than zero MPH, go to step next step.
11. Remove VSS. Inspect speedometer pinion gear for damage. Repair pinion gear as necessary and perform TEST VER-2A. If pinion gear is okay, replace VSS and perform TEST VER-2A.
12. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
13. Using scan tool in ohmmeter mode, check resistance of signal circuit (White/Orange wire) between VSS connector and PCM White connector. If resistance is 5 ohms or more, repair open signal circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
14. Check resistance between ground and PCM White connector, signal circuit (White/Orange wire). If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
15. If vehicle is not equipped with Daytime Running Lamps (DEL), repair short to ground in signal circuit (White/Orange wire) and perform TEST VER-2A. If vehicle is equipped with DRL, go to next step.
16. Disconnect DRL module connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
17. Using scan tool in ohmmeter mode, check resistance between ground and PCM White connector, signal circuit (White/Orange wire). If resistance is less than 5 ohms, replace DRL module and perform TEST VER-2A. If resistance is 5 ohms or more, repair short to ground in signal circuit and perform TEST VER-2A.

TEST TC-35B - NO VEHICLE SPEED SENSOR SIGNAL

Note. Perform TEST TC-35A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Connect a jumper wire to VSS connector, signal circuit (White/Orange wire). Using scan tool, read VSS signal. Momentarily touch other end of jumper wire to ground while monitoring VSS signal. If scan tool displays more than zero MPH, repair open ground circuit and perform TEST VER-2A. If scan tool displays zero MPH, replace powertrain control module and perform TEST VER-2A.

TEST TC-35C - NO VEHICLE SPEED SENSOR SIGNAL

Note. Perform TEST TC-35A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using scan tool in voltmeter mode, check voltage on signal circuit (White/Orange wire) between VSS connector and PCM White connector. If voltage is more than 4.5 volts, replace PCM and perform TEST VER-2A. If voltage is 4.5 volts or less, repair open signal circuit and perform TEST VER-2A.

TEST TC-36A - MAP SENSOR VOLTAGE TOO LOW OR NO 5 VOLTS TO MAP SENSOR

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Start engine and allow it to idle. Using scan tool, read Manifold Absolute Pressure (MAP) sensor voltage. If voltage is less than 0.2 volt, go to step 6). If voltage is not as specified, go to next step.
2. Turn engine off. Turn ignition on, engine off. Using scan tool, read MAP sensor voltage. If voltage is less than 2.35 volts, go to step 6). If voltage is not as specified, go to next step.
3. Wiggle wiring harness and connector going to MAP sensor while monitoring MAP sensor voltage. If voltage changes while wiggling wiring harness, repair wiring harness or connector as necessary and perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
4. Condition required to set DTC is not present at this time. MAP SENSOR VOLTAGE TOO LOW DTC sets when MAP sensor signal voltage is less than a predetermined voltage at start, or less than a predetermined voltage for 1.76 seconds with engine running. Possible causes are: open or shorted MAP sensor wiring, defective connections, defective MAP sensor or PCM. Go to next step.
5. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
6. Turn engine off. Turn ignition on, engine off. Disconnect MAP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
7. Using an external voltmeter, check voltage on MAP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4.5 volts or less, go to step 12). If voltage is more than 4.5 volts, go to next step.
8. Using scan tool, read MAP sensor voltage. If voltage is more than 4.5 volts, replace MAP sensor and perform TEST VER-2A. If voltage is 4.5 volts or less, go to next step.
9. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
10. Using an external ohmmeter, check resistance between MAP sensor connector, signal circuit (Dark Green/Red wire) and ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair signal circuit for a short to ground circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
11. Check resistance between ground and MAP sensor connector, signal circuit (Dark Green/Red wire). If resistance is less than 5 ohms, repair short to ground in signal circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.
12. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
13. Using an external ohmmeter, check resistance of 5-volt supply circuit (Violet/White wire) between MAP sensor connector and PCM Black connector. If resistance is 5 ohms or more, repair open 5-volt supply circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
14. Check resistance between ground and MAP sensor connector, 5-volt supply circuit (Violet/White wire). If resistance is less than 5 ohms, repair short to ground in 5-volt supply circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.

TEST TC-37A - MAP SENSOR VOLTAGE TOO HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Start engine. Using scan tool, read Manifold Absolute Pressure (MAP) sensor voltage. If voltage is more than 4.6 volts, go to step 5). If voltage is 4.6 volts or less, go to next step.
2. Wiggle wiring harness and connector going to MAP sensor while monitoring MAP sensor voltage. If voltage changes while wigging wiring harness, repair wiring harness or connector as necessary and perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
3. Condition required to set DTC is not present at this time. MAP SENSOR VOLTAGE TOO HIGH DTC sets if MAP sensor voltage is more than 4.6 volts at engine start or with engine running for 1.76 seconds. Possible causes are: open or shorted MAP sensor wiring, defective connections, defective MAP sensor or PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Turn engine off. Turn ignition on, engine off. Disconnect MAP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using an external voltmeter, check voltage on MAP sensor connector, signal circuit (Dark Green/Red wire). If voltage is more than 5.5 volts, repair short to battery voltage in signal circuit and perform TEST VER-2A. If voltage is 5.5 volts or less, go to next step.
7. Turn ignition off. Using an external ohmmeter, check resistance between MAP sensor connector, signal circuit (Dark Green/Red wire) and 5-volt supply circuit (Violet/White wire). If resistance is less than 5 ohms, repair signal circuit shorted to 5-volt supply circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
8. Connect a jumper wire between MAP sensor connector, signal circuit (Dark Green/Red wire) and ground circuit (Black/Light Blue wire). Using scan tool read MAP sensor voltage. If voltage is less than one volt, replace MAP sensor and perform TEST VER-2A. If voltage is one volt or more, go to next step.
9. Move jumper wire from MAP sensor connector, ground circuit (Black/Light Blue wire) to ground. Read MAP sensor voltage. If voltage is less than one volt, repair open in ground circuit and perform TEST VER-2A. If voltage is one volt or more, go to next step.
10. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
11. Using an external ohmmeter, check resistance of MAP sensor connector, signal circuit (Dark Green/Red wire) between MAP sensor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open signal circuit and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-37A to TEST TC-39A. No tests have been omitted.

TEST TC-39A - NO CHANGE IN MAP FROM START TO RUN

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition on, engine off. Using scan tool, read DTCs. If scan tool displays MAP SENSOR VOLTAGE TOO LOW, perform TEST TC-36A. If scan tool does not display MAP SENSOR VOLTAGE TOO LOW, go to next step.
2. Using scan tool, clear DTCs. Start engine and allow it to idle for 30 seconds. Using scan tool, read DTCs. If scan tool displays NO CHANGE IN MAP FROM START TO RUN, go to step 8). If scan tool does not display NO CHANGE IN MAP FROM START TO RUN, go to next step.
3. With engine idling, use scan tool to increase engine speed to 1500 RPM and read MAP sensor voltage while wiggling wiring harness and connectors from PCM to MAP sensor. If engine stalls or voltage becomes erratic while wiggling wiring harness, repair wiring harness and connectors as necessary and perform TEST VER-2A. If engine does not stall and voltage does not become erratic while wiggling wiring harness, go to next step.
4. Using scan tool return engine to idle. While monitoring engine vacuum on scan tool display, snap throttle open and closed several times. If scan tool displays rapid vacuum decrease to less than one in. Hg, go to next step. If vacuum does not decrease rapidly to less than one in. Hg, go to step 7).
5. Condition required to set DTC is not present at this time. NO CHANGE IN MAP FROM START TO RUN DTC sets if Powertrain Control Module (PCM) detects too small a difference between barometric pressure at ignition and manifold vacuum with engine running for 1.72 seconds. Possible causes are: restricted or leaking vacuum supply to MAP sensor, defective MAP sensor wiring or connector, defective MAP sensor or PCM.
6. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
7. Remove MAP sensor. Inspect intake manifold, throttle body and MAP sensor vacuum ports for vacuum restriction. If restriction exists, repair as necessary and perform TEST VER-2A. If no restriction exists, replace MAP sensor and perform TEST VER-2A.
8. Turn ignition on, engine off. Remove MAP sensor. Inspect intake manifold, throttle body and MAP sensor vacuum ports for vacuum restriction. If restriction exists, repair as necessary and perform TEST VER-2A. If no restriction exists, go to next step.
9. Using an external voltmeter, check voltage on MAP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4.5 volts or less, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is more than 4.5 volts, replace MAP sensor and perform TEST VER-2A.

TEST TC-40A - NO CRANK REFERENCE SIGNAL AT PCM

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Attempt to start engine while using scan tool to monitor CURRENT CKP COUNT. If scan tool does not display a change in CKP count when attempting to start engine, go to step 5). If scan tool displays a change in CKP count when attempting to start engine, go to next step.
2. Condition required to set DTC is not present at this time. NO CRANK REFERENCE SIGNAL DTC sets when no Crankshaft Position (CKP) sensor signal is received by Powertrain Control Module (PCM) during engine cranking, Camshaft Position (CMP) sensor signal is present with no CKP sensor signal, or no CMP sensor signal is present when CKP sensor signal is present. Possible causes are: open or shorted sensor wiring, defective connections, improper CKP or CMP sensor clearance, defective CKP or CMP sensor and components, damaged flywheel or crankshaft pulse ring, broken timing belt or defective PCM. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
4. Start engine and allow it to idle. Wiggle wiring harness from PCM to CMP sensor and CKP sensor. If engine misfires or stalls while wiggling wiring harness, repair wiring harness as necessary and perform TEST VER-2A. If engine does not misfire or stall while wiggling wiring harness, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Turn ignition off. Disconnect Crankshaft Position (CKP) sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Turn ignition on. Using an external voltmeter, check voltage on CKP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4.5 volts or less, go to step 11). If voltage is more than 4.5 volts, go to next step.
7. Turn ignition off. Using an external ohmmeter, check resistance between ground and CKP sensor connector, ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
8. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
9. Using an external ohmmeter, check resistance of signal circuit (Gray/Black wire) between CKP sensor connector and PCM Black connector. If resistance is 5 ohms or more, repair open signal circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
10. Check resistance between ground and PCM Black connector, CKP signal circuit (Gray/Black wire). If resistance is 5 ohms or more, replace CKP sensor and perform TEST VER-2A. If resistance is less than 5 ohms, repair short to ground in signal circuit and perform TEST VER-2A.
11. Turn ignition off. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
12. Using an external ohmmeter, check resistance of 5-volt supply circuit (Violet/White wire) between CKP sensor connector and PCM Black connector. If resistance is 5 ohms or more, repair open 5-volt supply circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
13. Check resistance between ground and PCM Black connector, CKP 5-volt supply circuit (Violet/White wire). If resistance is less than 5 ohms, repair short to ground in 5-volt supply circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.

TEST TC-43A - IGNITION COIL #1 PRIMARY CIRCUIT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Perform TEST TC-43B.
2. Disconnect spark plug cable at No. 6 spark plug. Connect cable terminal to a spark tester. Connect spark tester to ground. Go to next step. NOTE: When checking for spark, consider one or two sparks as a no-spark condition.
3. Turn ignition on, engine off. Using scan tool, actuate ignition coil No. 1, while watching for spark. If a good spark does not occur, go to step 7). If a good spark occurs, go to next step.
4. Condition required to set DTC is not present at this time. IGNITION COIL PRIMARY CIRCUIT DTC sets if Powertrain Control Module (PCM) does not see peak current reached. Possible causes are: open ignition coil No. 1 primary circuit, open or shorted driver circuit, open Auto Shutdown (ASD) relay output circuit, or defective PCM. Go to next step.
5. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
6. Wiggle wiring harness from PCM to front coil. If spark becomes erratic or stops, repair wiring harness where wiggling causes problem to occur and perform TEST VER-2A. If spark does not become erratic or stop, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
7. Turn ignition off. Disconnect front coil connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Turn ignition on. Using scan tool, actuate ignition coil No. 1. Using an external voltmeter, check voltage on coil connector, Auto Shutdown (ASD) relay output circuit (Dark Green/Orange wire). If voltage is 10 volts or less, repair open ASD relay output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
9. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
10. Using an external ohmmeter, check resistance between ground and PCM Black connector, ignition coil No. 1 driver circuit (Black/Gray wire). If resistance is less than 5 ohms, repair short to ground in ignition coil No. 1 driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
11. Check resistance of ignition coil No. 1 driver circuit (Black/Gray wire) between PCM Black connector and coil connector. If resistance is 5 ohms or more, repair open ignition coil No. 1 driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
12. Check resistance of ignition coil No. 1 primary circuit. Put one ohmmeter lead on front ignition coil driver No. 1 terminal. Put other ohmmeter lead on ASD relay output terminal. (Scheme 42) If resistance is 2 ohms or more, replace ignition coil and perform TEST VER-2A. If resistance is less than 2 ohms, replace PCM and perform TEST VER-2A.

Identifying Ignition Coil Terminals (Typical). Scheme 42

TEST TC-43B - IGNITION COIL #1 PRIMARY CIRCUIT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect ignition coil connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Turn ignition on. Using scan tool, actuate ignition coil No. 1. Using an external voltmeter, check voltage on coil connector, Auto Shutdown (ASD) relay output circuit (Dark Green/Orange wire). If voltage is 10 volts or less, repair open ASD relay output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
3. Turn ignition off. Using an external ohmmeter, check resistance of ignition coil No. 1 primary circuit. Check resistance across ignition coil primary terminals. (Scheme 42) If resistance is 2 ohms or more, replace ignition coil and perform TEST VER-2A. If resistance is less than 2 ohms, go to next step.
4. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Check resistance between ground and PCM Black connector, ignition coil driver circuit (Black/Gray wire). If resistance is less than 5 ohms, repair short to ground in ignition coil driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. Check resistance of ignition coil driver circuit (Black/Gray wire) between PCM Black connector and coil connector. If resistance is 5 ohms or more, repair open ignition coil driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

TEST TC-44A - NO ASD RELAY OUTPUT VOLTAGE AT PCM

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read DTCs. If scan tool displays AUTO SHUTDOWN RELAY CONTROL CIRCUIT, perform TEST TC-10A. If scan tool does not display AUTO SHUTDOWN RELAY CONTROL CIRCUIT, go to next step.
2. Using scan tool erase DTCs. Start engine and allow it to idle for 10 seconds. Read DTCs. If scan tool displays NO ASD RELAY OUTPUT VOLTAGE AT PCM with a START/RUN count of zero, go to step 6). If scan tool does not display NO ASD RELAY OUTPUT VOLTAGE AT PCM with a START/RUN count of more than zero, go to next step.
3. Condition required to set DTC is not present at this time. NO ASD RELAY OUTPUT VOLTAGE AT PCM DTC sets if no voltage is sensed at PCM when Auto Shutdown (ASD) relay is energized. Possible causes are: defective ASD wiring circuit, defective ASD relay or PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
5. Erase DTCs. Start engine and allow it to idle. Wiggle wiring harness from PCM to ASD relay while monitoring scan tool. If NO ASD RELAY OUTPUT VOLTAGE AT PCM DTC resets, repair wiring harness as necessary and perform TEST VER-2A. If DTC does not reset while wiggling wiring harness, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
6. If vehicle is equipped with a diesel engine, perform TEST TC-44B. Attempt to start engine. If engine starts, go to step 12). If engine does not start, go to next step.
7. Remove ASD relay. Inspect ASD relay connector for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Using an external voltmeter, check voltage on ASD relay connector, fused B+ circuit (Gray/White wire). If voltage is 10 volts or less, repair open fused B+ circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
9. Install a substitute ASD relay. Attempt to start engine. If engine starts, replace original ASD relay and perform TEST VER-2A. If engine does not start, go to next step.
10. Turn ignition off. Disconnect PCM Gray connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
11. Using an external ohmmeter, check resistance of ASD relay output circuit (Dark Green/Orange wire) between ASD relay connector and PCM Gray connector. If resistance is more than 5 ohms, repair open ASD relay output circuit and perform TEST VER-2A. If resistance is 5 ohms or less, replace PCM and perform TEST VER-2A.
12. Turn ignition off. Disconnect PCM Gray connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
13. Using an external ohmmeter, check resistance of ASD relay output circuit (Dark Green/Orange wire) between ASD relay connector and PCM Gray connector. If resistance is more than 5 ohms, repair open ASD relay output circuit and perform TEST VER-2A. If resistance is 5 ohms or less, replace PCM and perform TEST VER-2A.

TEST TC-44B - NO ASD RELAY OUTPUT VOLTAGE AT PCM

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. This test applies to BR body equipped with diesel engine only.

1. Remove ASD relay. Inspect ASD relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external voltmeter, check voltage on ASD relay connector, fused B+ circuit (Gray/White wire). If voltage is 10 volts or less, repair open fused B+ circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
3. Using scan tool, erase DTCs. Start engine and allow it to idle for 10 seconds. Using scan tool, read DTCs. If scan tool does not display NO ASD OUTPUT VOLTAGE AT PCM, replace original ASD relay and perform TEST VER-2A. If scan tool displays NO ASD RELAY OUTPUT VOLTAGE AT PCM DTC, go to next step.
4. Turn ignition off. Disconnect PCM Gray connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance of ASD relay output circuit (Dark Green/Orange wire) between ASD relay connector and PCM Gray connector. If resistance is more than 5 ohms, repair open ASD relay output circuit and perform TEST VER-2A. If resistance is 5 ohms or less, replace PCM and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-44B to TEST TC-48A. No tests have been omitted.

TEST TC-48A - PCM FAILURE SRI MILE NOT STORED

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, perform SRI MEMORY TEST. If scan tool displays WRITE FAILURE, replace Powertrain Control Module (PCM) and perform TEST VER-2A. If scan tool does not display WRITE FAILURE, go to next step.
2. If scan tool displays WRITE REFUSED, go to next step. If scan tool does not display WRITE REFUSED, but it displays SRI MILEAGE INVALID, update mileage, repeat SRI MEMORY TEST, and perform TEST VER-2A. If scan tool does not display WRITE REFUSED or SRI MILEAGE INVALID, go to step 4).
3. Using scan tool, repeat SRI MEMORY TEST. If scan tool displays WRITE REFUSED, replace PCM and perform TEST VER-2A. If scan tool does not display WRITE REFUSED, and it displays SRI MILEAGE INVALID, update mileage, repeat SRI MEMORY TEST, and perform TEST VER-2A. If scan tool does not display SRI MILEAGE INVALID, go to next step.
4. Compare SRI mileage stored with mileage on instrument panel odometer. If mileage is the same, repeat SRI MEMORY TEST and perform TEST VER-2A. If mileage is not the same, update mileage, repeat SRI MEMORY TEST, and perform TEST VER-2A.

TEST TC-49A - PCM FAILURE EEPROM WRITE DENIED

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, perform SRI MEMORY TEST. If scan tool does not display WRITE REFUSED, Test is complete. Perform TEST VER-2A. If scan tool displays WRITE REFUSED, go to next step.
2. Using scan tool, repeat SRI MEMORY TEST. If scan tool displays WRITE REFUSED, replace PCM and perform TEST VER-2A. If scan tool does not display WRITE REFUSED, test is complete. Perform TEST VER-2A.

TEST TC-50A - TRANS 3-4 SOLENOID/TRANS RELAY CKTS

Note. Test applies to vehicles equipped with automatic transmission only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. If 12-VOLT RELAY CONTROL CIRCUIT DTC is also set, perform TEST TC-173. If DTC is not set, road test vehicle and reach a speed of 50 MPH. Depress Overdrive (OD) switch 4 times so that vehicle attempts to shift from fourth gear to third gear and back. If vehicle does not shift between third and fourth gear, go to step 5). If vehicle shifts between third and fourth gear, go to next step.
2. Condition required to set DTC is not present at this time. 3-4 SOLENOID CIRCUIT DTC sets if an open or shorted circuit exists in3-4 shift solenoid circuit. Possible causes are: open or shorted wiring to 3-4 shift solenoid, open fused ignition switch output circuit, defective connector terminals, or defective 3-4 shift solenoid. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
4. Using scan tool, erase DTCs. Start engine. Using scan tool, read DTCs while wiggling wiring harness from 3-4 shift solenoid to PCM and note if 3-4 SOLENOID DTC resets. If DTC resets, repair wiring harness as necessary and perform TEST VER-2A. If DTC does not reset, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Turn ignition off. Disconnect Transmission (TRANS) solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Turn ignition on. Using scan tool, actuate TRANS control relay. Using scan tool in voltmeter mode, check voltage on TRANS solenoid connector, TRANS relay output circuit (Red wire on BR body; Light Blue wire on all other bodies). If voltage does not switch from zero to more than 10 volts, perform TEST TC-50B. If voltage switches from zero to more than 10 volts, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
8. Turn ignition on. Check voltage on TRANS solenoid connector, 3-4 solenoid control circuit (Brown wire). If voltage is more than 10 volts, perform TEST TC-50D. If voltage is 10 volts or less, go to next step.
9. Turn ignition off. Using an external ohmmeter, check resistance between ground and PCM White connector, 3-4 solenoid control circuit (Brown wire). If resistance is less than 5 ohms, repair short to ground in 3-4 solenoid control circuit and perform TEST TC-50D. If resistance is 5 ohms or more, go to next step.
10. Reconnect TRANS solenoid connector. Check resistance between ground and PCM White connector, 3-4 solenoid control circuit (Brown wire). If resistance is less than 5 ohms, repair short to ground in 3-4 solenoid control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
11. Remove TRANS control relay. Inspect TRANS relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
12. Using external ohmmeter, connect one lead to TRANS relay connector, TRANS control relay output circuit (Red wire on BR body; Light Blue wire on all other bodies). Go to next step.
13. Connect other lead to PCM White connector, 3-4 shift solenoid control circuit (Brown wire). If resistance is 26-40 ohms, replace PCM and perform TEST VER-2A. If resistance is less than 26 ohms, perform TEST TC-50C. If resistance is more than 40 ohms, go to next step.
14. Turn ignition off. Disconnect TRANS solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
15. Check resistance of 3-4 solenoid circuit (Brown wire) between PCM White connector and TRANS solenoid connector. If resistance is 5 ohms or more, repair open 3-4 solenoid circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace TRANS solenoid and harness assembly. Perform TEST VER-2A.

TEST TC-50B - TRANS 3-4 SOLENOID/TRANS RELAY CKTS

Note. Perform TEST TC-50A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Remove Transmission (TRANS) control relay. Inspect TRANS relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance between ground and TRANS control relay connector, TRANS control relay output circuit (Red wire on BR body; Light Blue wire on all other bodies). If resistance is less than 5 ohms, repair short to ground in TRANS control relay output circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
3. Check resistance of TRANS control relay circuit (Red wire on BR body; Light Blue wire on all other bodies) between TRANS solenoid connector and TRANS relay connector. If resistance is more than 5 ohms, repair open TRANS control relay circuit and perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
4. Turn ignition on. Using scan tool, check voltage on TRANS relay connector, fused B+ circuit (Red/White wire). If voltage is 10 volts or less, repair open fused B+ circuit and perform TEST VER-2A. If voltage is more than 10 volts, replace TRANS control relay and perform TEST VER-2A.

TEST TC-50C - TRANS 3-4 SOLENOID/TRANS RELAY CKTS

Note. Perform TEST TC-50A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Transmission (TRANS) solenoid and Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance between TRANS solenoid connector, 3-4 shift solenoid control circuit (Brown wire) and all other circuits in solenoid connector. If resistance is less than 5 ohms between any 2 circuits, repair TRANS control relay output circuit for a short to other circuit(s), perform TEST VER-2A and go to step 4). If resistance is 5 ohms or more between all circuits, go to next step.
3. Replace TRANS solenoid pack and wiring harness, perform TEST VER-2A, connect all disconnected connectors and go to next step.
4. Road test vehicle and reach a speed of 50 MPH. Depress Overdrive (OD) switch 4 times so that vehicle attempts to shift from fourth gear to third gear and back. If vehicle does not shift between third and fourth gear, replace PCM and perform TEST VER-2A. If vehicle shifts between third and fourth gear, test is complete.

TEST TC-50D - TRANS 3-4 SOLENOID/TRANS RELAY CKTS

Note. Perform TEST TC-50A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Repair 3-4 solenoid control circuit for short to voltage. Perform TEST VER-2A. Connect all disconnected connectors and go to next step.
2. Road test vehicle and reach a speed of 50 MPH. Depress Overdrive (OD) switch 4 times so that vehicle attempts to shift from fourth gear to third gear and back. If vehicle does not shift between third and fourth gear, replace PCM and perform TEST VER-2A. If vehicle shifts between third and fourth gear, test is complete.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-50D to TEST TC-55A. No tests have been omitted.

TEST TC-57A - INTAKE AIR TEMPERATURE SENSOR VOLTAGE LOW

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read Intake Air Temperature (IAT) sensor voltage. If voltage is less than 0.5 volt, go to step 5). If voltage is 0.5 volt or more, go to next step.
2. Wiggle wiring harness and connector from Powertrain Control Module (PCM) to IAT sensor while monitoring IAT sensor voltage. If voltage changes while wiggling wiring harness, repair wiring harness as necessary and perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
3. Condition required to set DTC is not present at this time. INTAKE AIR TEMPERATURE SENSOR VOLTAGE LOW DTC sets when IAT sensor voltage at PCM is less than 0.5 volt. Possible causes are: shorted IAT sensor wiring, defective connections, defective IAT sensor or PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Disconnect IAT sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using scan tool, read IAT sensor voltage. If voltage is more than 4 volts, replace IAT sensor and perform TEST VER-2A. If voltage is 4 volts or less, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between IAT sensor connector, sensor signal circuit (Black/Red wire) and ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair signal circuit for a short to ground circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
9. Check resistance between ground and sensor connector, sensor signal circuit (Black/Red wire). If resistance is less than 5 ohms, repair short to ground in sensor signal circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.

TEST TC-58A - INTAKE AIR TEMPERATURE SENSOR VOLTAGE HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read Intake Air Temperature (IAT) sensor voltage. If voltage is more than 4.5 volts, go to step 5). If voltage is 4.5 volts or less, go to next step.
2. Wiggle wiring harness and connector from Powertrain Control Module (PCM) to IAT sensor while monitoring IAT sensor voltage. If voltage changes while wiggling wiring harness, repair wiring harness as necessary and perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
3. Condition required to set DTC is not present at this time. INTAKE AIR TEMPERATURE SENSOR VOLTAGE HIGH DTC sets when IAT sensor voltage at PCM is more than 4.5 volts. Possible causes are: open IAT sensor wiring, defective connections, defective IAT sensor or PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Disconnect IAT sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using an external voltmeter, check voltage on IAT sensor connector, signal circuit (Black/Red wire). If voltage is more than 6 volts, repair signal circuit for short to voltage and perform TEST VER-2A. If voltage is 6 volts or less, go to next step.
7. Connect a jumper wire across IAT sensor connector, sensor signal circuit (Black/Red wire) and sensor ground circuit (Black/Light Blue wire). Go to next step.
8. Using scan tool, read IAT sensor voltage. If voltage is less than one volt, replace IAT sensor and perform TEST VER-2A. If voltage is one volt or more, go to next step.
9. Move jumper wire from IAT sensor connector, ground circuit (Black/Light Blue wire) to ground. Read IAT sensor voltage. If voltage is less than one volt, repair open sensor ground circuit and perform TEST VER-2A. If voltage is one volt or more, go to next step.
10. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
11. Using an external ohmmeter, check resistance of sensor signal circuit (Black/Red wire) between IAT sensor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open sensor signal circuit and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-58A to TEST TC-61A. No tests have been omitted.

TEST TC-61A - INJECTOR #4 CONTROL CIRCUIT

Note. Perform TEST TC-21A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect injector No. 4 electrical connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance across injector No. 4 terminals. If resistance is not 10-16 ohms, replace injector and perform TEST VER-2A. If resistance is 10-16 ohms, go to next step.
3. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Using an external voltmeter, check voltage on injector No. 4 connector, ASD relay output circuit (Dark Green/Orange wire). If voltage does not cycle from high voltage to low voltage, repair open ASD relay output circuit and perform TEST VER-2A. If voltage cycles from high voltage to low voltage, go to next step.
4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and PCM White connector, injector No. 4 driver circuit (Light Blue/Brown wire). If resistance is less than 5 ohms, repair short to ground in injector No. 4 driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step. 6) Check resistance of injector No. 4 driver circuit (Light Blue/Brown wire) between injector No. 4 connector and PCM White connector. If resistance is 5 ohms or more, repair open injector No. 4 driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

TEST TC-62A - 1/1 O2 SENSOR SHORTED TO VOLTAGE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/1 Heated Oxygen Sensor (HO2S) is located in upstream position. On models equipped with 2 upstream HO2S, 1/1 HO2S is located in left upstream position.

1. Warm engine to normal operating temperature. Wait 4 minutes with engine running. Using scan tool, read 1/1 HO2S voltage. If voltage is more than 1.5 volts, go to step 5). If voltage is 1.5 volts or less, go to next step.
2. Wiggle wiring harness and connector at 1/1 HO2S while monitoring1/1 HO2S voltage. If voltage increases to more than 1.5 volts at any time while wiggling wiring harness, repair wiring harness and connector for intermittent short to voltage or open circuit as necessary and perform TEST VER-2A. If voltage does not increase to more than 1.5 volts at any time, go to next step.
3. Conditions required to set DTC is not present at this time. UPSTREAM O2 SENSOR SHORTED TO VOLTAGE DTC sets if 1/1 HO2S voltage is more than 1.5 volts. Possible causes are: 1/1 HO2S wiring shorted to voltage, dirt or moisture in connectors causing voltage tracking, defective connections, defective 1/1 HO2S or PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, test is complete. Perform TEST VER-2A.
5. Disconnect 1/1 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using scan tool, read 1/1 HO2S voltage. If voltage is 4.97 volts or less, replace 1/1 HO2S and perform TEST VER-2A. If voltage is more than 4.97 volts, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A If connector and terminals are okay, go to next step.
8. Turn ignition on. Using an external voltmeter, check voltage on 1/1 HO2S connector, sensor signal circuit (Tan/White wire). If voltage is more than 5 volts, repair sensor signal circuit for short to voltage and perform TEST VER-2A. If voltage is 5 volts or less, go to next step.
9. Wiggle wiring harness and connector at 1/1 HO2S while monitoring1/1 HO2S voltage. If voltage changes while wiggling wiring harness, repair wiring harness for short to voltage and perform TEST VER-2A. If voltage does not change, replace PCM and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-62A to TEST TC-66A. No tests have been omitted.

TEST TC-66A - 2/1 O2 SENSOR SHORTED TO VOLTAGE

Note. This test applies to BR body equipped with medium duty and heavy duty engines only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 2/1 Heated Oxygen Sensor (HO2S) is located in right upstream position.

1. Warm engine to normal operating temperature. Wait 4 minutes with engine running. Using scan tool, read 2/1 HO2S voltage. If voltage is more than 1.5 volts, go to step 5). If voltage is 1.5 volts or less, go to next step.
2. Wiggle wiring harness and connector at 2/1 HO2S while monitoring2/1 HO2S voltage. If voltage increases to more than 1.5 volts at any time while wiggling wiring harness, repair wiring harness and connector for intermittent short to voltage as necessary and perform TEST VER-2A. If voltage does not increase to more than 1.5 volts at any time, go to next step.
3. Condition required to set DTC is not present at this time. UPSTREAM O2 SENSOR SHORTED TO VOLTAGE DTC sets if 2/1 HO2S voltage is more than 1.5 volts. Possible causes are: 2/1 HO2S wiring shorted to voltage, dirt or moisture in connectors causing voltage tracking, defective connections, defective 1/1 HO2S or PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If connectors and wiring are okay, test is complete. Perform TEST VER-2A.
5. Disconnect 2/1 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
6. Using scan tool, read 2/1 HO2S voltage. If voltage is 4.97 volts or less, replace 2/1 HO2S and perform TEST VER-2A. If voltage is more than 4.97 volts, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Turn ignition on. Using an external voltmeter, check voltage on 2/1 HO2S connector, sensor signal circuit (Black/Dark Green wire). If voltage is more than 5 volts, repair sensor signal circuit for short to voltage and perform TEST VER-2A. If voltage is 5 volts or less, go to next step.
9. Wiggle wiring harness and connector at 2/1 HO2S while monitoring2/1 HO2S voltage. If voltage changes while wiggling wiring harness, repair wiring harness for short to voltage and perform TEST VER-2A. If voltage does not change, replace PCM and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-66A to TEST TC-69A. No tests have been omitted.

TEST TC-69A - INJECTOR #5 CONTROL CIRCUIT

Note. Perform TEST TC-21A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect injector No. 5 electrical connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance across injector No. 5 terminals. If resistance is not 10-16 ohms, replace injector and perform TEST VER-2A. If resistance is 10-16 ohms, go to next step.
3. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Using an external voltmeter, check voltage on injector No. 5 connector, ASD relay output circuit (Dark Green/Orange wire). If voltage does not cycle from high voltage to low voltage, repair open ASD relay output circuit and perform TEST VER-2A. If voltage cycles from high voltage to low voltage, go to next step.
4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and PCM White connector, injector No. 5 driver circuit (Gray wire). If resistance is less than 5 ohms, repair short to ground in injector No. 5 driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. Check resistance of injector No. 5 driver circuit (Gray wire) between injector No. 5 connector and PCM White connector. If resistance is 5 ohms or more, repair open injector No. 5 driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

TEST TC-70A - INJECTOR #6 CONTROL CIRCUIT

Note. Perform TEST TC-21A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect injector No. 6 electrical connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance across injector No. 6 terminals. If resistance is not 10-16 ohms, replace injector and perform TEST VER-2A. If resistance is 10-16 ohms, go to next step.
3. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Using an external voltmeter, check voltage on injector No. 6 connector, ASD relay output circuit (Dark Green/Orange wire). If voltage does not cycle from high voltage to low voltage, repair open ASD relay output circuit and perform TEST VER-2A. If voltage cycles from high voltage to low voltage, go to next step.
4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and PCM White connector, injector No. 6 driver circuit (Brown/Dark Blue wire). If resistance is less than 5 ohms, repair short to ground in injector No. 6 driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. Check resistance of injector No. 6 driver circuit (Brown/Dark Blue wire) between injector No. 6 connector and PCM White connector. If resistance is 5 ohms or more, repair open injector No. 6 driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-70A to TEST TC-74A. No tests have been omitted.

TEST TC-74A - TRANS TEMP SENSOR VOLTAGE TOO LOW

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance between PCM White connector, Transmission Temperature (TRANS TEMP) signal circuit (Violet wire) and PCM Black connector, ground circuit (Black/Light wire). If resistance is less than 550 ohms, go to step 7). If resistance is 550-2300 ohms, go to next step. If resistance is more than 2300 ohms, perform TEST TC-75A.
3. Check resistance between ground and PCM White connector, TRANS TEMP signal circuit (Violet wire). If resistance is 5 ohms or less, go to step 7). If resistance is more than 5 ohms, go to next step.
4. Reconnect all connectors. Using scan tool, read TRANS TEMP voltage. If voltage is less than 1.5 volt, replace PCM and perform TEST VER-2A. If voltage is 1.5 volt or more, go to next step.
5. Condition required to set DTC is not present at this time. TRANS TEMP SENSOR VOLTAGE TOO LOW DTC sets when TRANS TEMP sensor voltage at PCM is less than 1.55 volts for 2.2 seconds. Possible causes are: shorted TRANS TEMP sensor wiring, defective connections, defective TRANS TEMP sensor or PCM. Go to next step.
6. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
7. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between PCM White connector, TRANS TEMP signal circuit (Violet wire) and PCM Black connector, ground circuit (Black/Light wire). If resistance is less than 5 ohms, repair TRANS TEMP signal circuit for short to ground circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
9. Check resistance between ground and PCM White connector, TRANS TEMP signal circuit (Violet wire). If resistance is less than 5 ohms, repair TRANS TEMP signal circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
10. Connect transmission solenoid connector. Remove transmission oil pan. Disconnect transmission Pressure/Temperature (PRESS/TEMP) sensor connector. Go to next step.
11. Check resistance between PCM White connector, TRANS TEMP signal circuit (Violet wire) and PCM Black connector, ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, replace transmission solenoid and harness assembly, and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
12. Check resistance between ground and PCM White connector, TRANS TEMP signal circuit (Violet wire). If resistance is less than 5 ohms, replace transmission solenoid and harness assembly, and perform TEST VER-2A. If resistance is 5 ohms or more, replace transmission PRESS/TEMP sensor and perform TEST VER-2A.

TEST TC-75A - TRANS TEMP SENSOR VOLTAGE TOO HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using scan tool in voltmeter mode, check voltage on PCM White connector, Transmission Temperature (TRANS TEMP) signal circuit (Violet wire). If voltage is more than one volt, go to step 7). If voltage is one volt or less, go to next step.
3. Turn ignition off. Using an external ohmmeter, check resistance between PCM White connector TRANS TEMP signal circuit (Violet wire) and PCM Black connector, ground circuit (Black/Light wire). If resistance is less than 550 ohms, perform TEST TC-74A. If resistance is 550-2300 ohms, go to next step. If resistance is more than 2300 ohms, perform TEST TC-75B.
4. Reconnect all connectors. Using scan tool, read TRANS TEMP voltage. If voltage is more than 3.76 volts, replace PCM and perform TEST VER-2A. If voltage is 3.76 volts or less, go to next step.
5. Condition required to set DTC is not present at this time. TRANS TEMP SENSOR VOLTAGE TOO LOW DTC sets when TRANS TEMP sensor voltage at PCM is more than 3.76 volts for 2.2 seconds. Possible causes are: open TRANS TEMP sensor wiring, defective connections, defective TRANS TEMP sensor or PCM. Go to next step.
6. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
7. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Using scan tool in voltmeter mode, check voltage on transmission solenoid connector, TRANS TEMP signal circuit (Violet wire). If voltage is more than one volt, repair TRANS TEMP signal circuit for short to ground and perform TEST VER-2A. If voltage is one volt or less, go to next step.
9. Connect transmission solenoid connector. Remove transmission oil pan. Disconnect transmission Pressure/Temperature (PRESS/TEMP) sensor connector. Go to next step.
10. Check voltage on transmission governor pressure sensor connector, TRANS TEMP signal circuit (Violet wire). If voltage is more than one volt, replace transmission solenoid and harness assembly, and perform TEST VER-2A. If voltage is one volt or less, replace transmission PRESS/TEMP sensor and perform TEST VER-2A.

TEST TC-75B - TRANS TEMP SENSOR VOLTAGE TOO HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of Transmission Temperature (TRANS TEMP) signal circuit (Violet wire) between TRANS TEMP sensor connector and PCM White connector. If resistance is 5 ohms or more, repair open signal circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
3. Check resistance of TRANS TEMP ground circuit (Black/Light Blue wire) between TRANS TEMP sensor connector and PCM Black connector. If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
4. Connect transmission solenoid connector. Remove transmission oil pan. Disconnect TRANS Pressure/Temperature (PRESS/TEMP) sensor connector. Go to next step.
5. Check resistance of TRANS TEMP signal circuit (Violet wire) between PCM White connector and transmission PRESS/TEMP sensor connector. If resistance is more than 5 ohms, replace transmission solenoid and harness assembly, and perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
6. Check resistance of TRANS TEMP ground circuit (Black/Light Blue wire) between PCM Black connector and transmission PRESS/TEMP sensor connector. If resistance is more than 5 ohms, replace transmission solenoid and harness assembly and perform TEST VER-2A. If resistance is 5 ohms or less, replace transmission PRESS/TEMP sensor and perform TEST VER-2A.

TEST TC-79A - INJECTOR #7 CONTROL CIRCUIT

Note. Perform TEST TC-21A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect injector No. 7 electrical connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance across injector No. 7 terminals. If resistance is not 10-16 ohms, replace injector and perform TEST VER-2A. If resistance is 10-16 ohms, go to next step.
3. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Using an external voltmeter, check voltage on injector No. 7 connector, ASD relay output circuit (Dark Green/Orange wire). If voltage does not cycle from high voltage to low voltage, repair open ASD relay output circuit and perform TEST VER-2A. If voltage cycles from high voltage to low voltage, go to next step.
4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and PCM White connector, injector No. 7 driver circuit. See INJECTOR NO. 7 DRIVER CIRCUIT IDENTIFICATION table. If resistance is less than 5 ohms, repair short to ground in injector No. 7 driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step. INJECTOR NO. 7 DRIVER CIRCUIT IDENTIFICATION Application Wire Color BR Body Violet/Tan
6. Check resistance of injector No. 7 driver circuit between injector No. 7 connector and PCM White connector. See INJECTOR NO. 7 DRIVER CIRCUIT IDENTIFICATION table. If resistance is 5 ohms or more, repair open injector No. 7 driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

TEST TC-80A - INJECTOR #8 CONTROL CIRCUIT

Note. Perform TEST TC-21A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect injector No. 8 electrical connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance across injector No. 8 terminals. If resistance is not 10-16 ohms, replace injector and perform TEST VER-2A. If resistance is 10-16 ohms, go to next step.
3. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Using an external voltmeter, check voltage on injector No. 8 connector, ASD relay output circuit (Dark Green/Orange wire). If voltage does not cycle from high voltage to low voltage, repair open ASD relay output circuit and perform TEST VER-2A. If voltage cycles from high voltage to low voltage, go to next step.
4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and PCM White connector, injector No. 8 driver circuit (Gray/Light Blue wire). If resistance is less than 5 ohms, repair short to ground in injector No. 8 driver circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. Check resistance of injector No. 8 driver circuit (Gray/Light Blue wire) between injector No. 8 connector and PCM White connector. If resistance is 5 ohms or more, repair open injector No. 8 driver circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-80A to TEST TC-82A. No tests have been omitted.

TEST TC-82A - SPEED CONTROL POWER RELAY OR 12-VOLT DRIVER CIRCUIT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. DO NOT depress brake pedal during following steps.

1. Disconnect S/C servo 4-pin connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-4A. If connector and terminals are okay, go to next step.
2. Turn ignition on, engine off. Using scan tool, actuate S/C relay. Using scan tool in voltmeter mode, check voltage on S/C servo 4-pin connector, switched S/C power supply circuit (Dark Blue/Red wire). If voltage is more than 10 volts, go to step 7). If voltage is 10 volts or less, go to next step.
3. Turn ignition off. Using scan tool in ohmmeter mode, check resistance between ground and S/C servo 4-pin connector, switched S/C power supply circuit (Dark Blue/Red wire). If resistance is less than 5 ohms, repair short to ground in switched S/C power supply circuit and perform TEST VER-4A. If resistance is 5 ohms or more, go to next step.
4. Disconnect brakelight switch connector. Turn ignition on, key off. Using scan tool, actuate S/C solenoid. Using scan tool in voltmeter mode, check voltage on brakelight switch connector, S/C on/off switch sense circuit (Yellow/Red wire). If voltage is 10 volts or less, perform TEST TC-82B. If voltage is more than 10 volts, go to next step.
5. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-4A. If connectors and terminals are okay, go to next step.
6. Using scan tool in ohmmeter mode, check resistance of S/C on/off switch sense circuit (Yellow/Red wire) between PCM Gray connector and brakelight switch connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-4A. If resistance is 5 ohms or more, repair open S/C on/off switch sense circuit and perform TEST VER-4A.
7. Turn ignition off. Using an external ohmmeter, check resistance between ground and S/C servo 4-pin connector, ground circuit (Black/White wire on BR body; Black wire on all other bodies). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
8. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-4A. If connectors and terminals are okay, go to next step.
9. Using an external ohmmeter, check resistance of S/C vacuum solenoid control circuit (Tan/Red wire) between PCM Gray connector and S/C servo 4-pin connector. If resistance is 5 ohms or more, repair open S/C vacuum solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
10. Check resistance of S/C vent solenoid control circuit (Light Green/Red wire) between PCM Gray connector and S/C servo 4-pin connector. If resistance is 5 ohms or more, repair open S/C vent solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
11. Check resistance between ground and S/C servo 4-pin connector,S/C vacuum solenoid control circuit (Tan/Red wire). If resistance is 5 ohms or more, repair short to ground in S/C vacuum solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
12. Check resistance between ground and S/C servo 4-pin connector,S/C vent solenoid control circuit (Light Green/Red wire). If resistance is 5 ohms or more, repair short to ground in S/C vent solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, replace S/C servo and perform TEST VER-4A.

TEST TC-82B - SPEED CONTROL SOLENOID CIRCUITS OR SPEED CONTROL POWER RELAY CIRCUITS

Note. Perform TEST TC-82A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using an external ohmmeter, check resistance of S/C on/off switch sense circuit (Yellow/Red wire) between brakelight switch connector and S/C servo connector. If resistance is more than 5 ohms, repair open S/C on/off switch sense circuit and perform TEST VER-4A. If resistance is 5 ohms or less, go to next step.
2. Check brakelight switch adjustment. Adjust brakelight switch as necessary and perform TEST VER-4A. If brakelight switch is adjusted properly, replace brakelight switch and perform TEST VER-4A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-82B to TEST TC-87A. No tests have been omitted.

TEST TC-87A - SPEED CONTROL SWITCH ALWAYS LOW

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, record all DTCs. Clear DTCs. Turn ignition off. Using scan tool, read Speed Control (S/C) switch sensor voltage. If voltage is less than one volt, go to step 3). If voltage is one volt or more, go to next step.
2. Condition required to set DTC is not present at this time. SPEED CONTROL SWITCHES DTC sets if Powertrain Control Module (PCM) senses actual switch state does not match intended switch state. Possible causes are: shorted switch circuit, defective PCM, open switch ground circuit or shorted or open switch. See INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-4A.
3. Disconnect S/C switch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-4A. If connector and terminals are okay, go to next step.
4. Read S/C switch sensor voltage. If voltage changes to 5 volts, replace S/C switch and perform TEST VER-4A. If voltage does not change to 5 volts, go to next step.
5. Turn ignition off. Using an external ohmmeter, check resistance between S/C switch connector, S/C switch signal circuit (White wire) and ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair S/C switch signal circuit shorted to ground circuit and perform TEST VER-4A. If resistance is 5 ohms or more, go to next step.
6. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-4A. If connectors and terminals are okay, go to next step.
7. Turn ignition off. Using an external ohmmeter, check resistance between PCM Gray connector, S/C switch signal circuit (Red/Light Green wire) and PCM Black connector, ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair S/C switch signal circuit shorted to ground circuit and perform TEST VER-4A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-4A.

TEST TC-101A - FUEL PUMP (SYSTEM) RELAY CONTROL CIRCUIT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, actuate Fuel Pump (FP) relay. If FP relay does not click, go to step 5). If FP relay clicks, go to next step.
2. Condition required to set DTC is not present at this time. FUEL PUMP RELAY CONTROL CIRCUIT DTC sets if an open or short is detected in FP relay circuit. Possible causes are: open or short in FP relay control circuit, open or short in FP relay fused ignition switch output circuit, FP relay coil open or shorted, inoperative circuit driver in Powertrain Control Module (PCM) or PCM failure. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
4. Using scan tool, actuate FP rely. Wiggle wiring harness from FP relay to PCM. If FP relay stops clicking while wiggling wiring harness, repair wiring harness as necessary and perform TEST VER-2A. If FP relay does not stop clicking while wiggling wiring harness, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Remove FP relay. Inspect FP relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using an external voltmeter, check voltage on FP relay connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
7. Using an external ohmmeter, check resistance across FP relay terminals. (Scheme 41) If resistance is 100 ohms or more, replace FP relay and perform TEST VER-2A. If resistance is less than 100 ohms, go to next step.
8. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
9. Check resistance between ground and PCM Gray connector, FP relay control circuit. See FUEL PUMP RELAY CONTROL CIRCUIT IDENTIFICATION table. If resistance is less than 5 ohms, repair short to ground in FP relay control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step. FUEL PUMP RELAY CONTROL CIRCUIT IDENTIFICATION Application Wire Color BR Body Brown/White
10. Check resistance of FP relay control circuit (Brown/White wire) between FP relay connector and PCM Gray connector. If resistance is 5 ohms or more, repair open FP relay control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

TEST TC-102A - 1/1 O2 SENSOR SLOW RESPONSE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/1 Heated Oxygen Sensor (HO2S) is located in upstream position. On models equipped with 2 upstream HO2S, 1/1 HO2S is located in left upstream position.

1. Start engine. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary and perform TEST VER-5A. If exhaust system is okay, go to next step.
2. Check exhaust for excessive smoke caused by oil or coolant consumption. Repair engine mechanical condition as necessary, replace catalytic converter and HO2Ss, and perform TEST VER-5A. If engine mechanical condition is okay, go to next step.
3. Turn ignition off. Disconnect 1/1 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
4. Using an external ohmmeter, check resistance between ground and 1/1 HO2S connector, sensor ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, repair open sensor ground circuit and perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
5. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A. If connectors and terminals are okay, replace 1/1 HO2S and perform TEST VER-5A.

TEST TC-103A - 1/1 O2 SENSOR HEATER FAILURE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/1 Heated Oxygen Sensor (HO2S) is located in upstream position. On models equipped with 2 upstream HO2S, 1/1 HO2S is located in left upstream position.

Note. Allow HO2S to cool to room temperature before checking resistance.

1. Using scan tool, read DTCs. Repair any other HO2S related DTCs before proceeding. Turn ignition on, engine off. Wait 3 minutes. Using scan tool in SENSORS, monitor 1/1 HO2S voltage. Wait for voltage to stabilize at more than 4.5 volts. Go to next step.
2. Using scan tool in ACTUATOR TESTS, perform HO2S heater test. Monitor 1/1 HO2S voltage for 3 minutes. If voltage is more than one volt, go to step 4). If voltage is one volt or less and you have been sent to this test from TEST TC-118A, return to TEST TC-118A. If you have not been sent here from TEST TC-118A, go to next step.
3. Condition required to set DTC is not present at this time. O2 SENSOR HEATER FAILURE DTC sets if Powertrain Control Module (PCM) senses HO2S voltage at more than 3 volts for 30 to 90 seconds after a cold engine start. Possible causes are: open HO2S heater element circuit, HO2S failure, HO2S heater wiring failure, PCM failure, defective connections or wiring. Stop all actuator tests. Test is complete.
4. Disconnect 1/1 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
5. Ensure scan tool is actuating HO2S heater test. Using an external voltmeter, check voltage on HO2S ASD relay output circuit (Dark Green/Orange wire). If voltage is 10 volts or less, repair open ASD relay output circuit and perform TEST VER-5A. If resistance is more than 10 volts, go to next step.
6. Stop all actuator tests. Using an external ohmmeter, check resistance between HO2S (component side), ASD relay output circuit (White wire) and heater ground circuit (White wire). (Scheme 43) If resistance is not 4-7 ohms, replace 1/1 HO2S and perform TEST VER-5A. If resistance is 4-7 ohms, go to next step.
7. Check resistance between ground and HO2S connector, heater ground circuit (Black wire). If resistance is 5 ohms or more, repair open heater ground circuit and perform TEST VER-5A. If resistance is less than 5 ohms, replace 1/1 HO2S and perform TEST VER-5A.

Identifying Heated Oxygen Sensor Connector Terminals (Component Side). Scheme 43

TEST TC-104A - 1/2 O2 SENSOR SLOW RESPONSE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position.

1. Start engine. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary and perform TEST VER-5A. If exhaust system is okay, go to next step.
2. Check exhaust for excessive smoke caused by oil or coolant consumption. Repair engine mechanical condition as necessary, replace catalytic converter and HO2Ss, and perform TEST VER-5A. If engine mechanical condition is okay, go to next step.
3. Turn ignition off. Disconnect 1/2 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
4. Using an external ohmmeter, check resistance between ground and 1/2 HO2S connector), sensor ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, repair open sensor ground circuit and perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
5. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A. If connectors and terminals are okay, replace 1/2 HO2S and perform TEST VER-5A.

TEST TC-105A - 1/2 O2 SENSOR HEATER FAILURE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position.

Note. Allow HO2S to cool to room temperature before checking resistance.

1. Using scan tool, read DTCs. Repair any other HO2S related DTCs before proceeding. Turn ignition on, engine off. Wait 3 minutes. Using scan tool in SENSORS, monitor 1/1 HO2S voltage. Wait for voltage to stabilize at more than 4.5 volts. Go to next step.
2. Using scan tool in ACTUATOR TESTS, perform HO2S heater test. Monitor 1/2 HO2S voltage for 3 minutes. If voltage is more than one volt, go to step 4). If voltage is one volt or less, go to next step.
3. Condition required to set DTC is not present at this time. O2 SENSOR HEATER FAILURE DTC sets if Powertrain Control Module (PCM) senses HO2S voltage at more than 3 volts for 30 to 90 seconds after a cold engine start. Possible causes are: open HO2S heater element circuit, HO2S failure, HO2S heater wiring failure, PCM failure, defective connections or wiring. Stop all actuator tests. Test is complete
4. Disconnect 1/2 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
5. Ensure scan tool is actuating HO2S heater test. Using an external voltmeter, check voltage on HO2S ASD relay output circuit (Dark Green/Orange wire). If voltage is 10 volts or less, repair open ASD relay output circuit and perform TEST VER-5A. If resistance is more than 10 volts, go to next step.
6. Stop all actuator tests. Using an external ohmmeter, check resistance between HO2S (component side), ASD relay output circuit (White wire) and heater ground circuit (White wire). (Scheme 43) If resistance is not 4-7 ohms, replace 1/2 HO2S and perform TEST VER-5A. If resistance is 4-7 ohms, go to next step.
7. Check resistance between ground and HO2S connector, heater ground circuit (Black wire). If resistance is 5 ohms or more, repair open heater ground circuit and perform TEST VER-5A. If resistance is less than 5 ohms, replace 1/2 HO2S and perform TEST VER-5A.

TEST TC-106A - MULTIPLE CYLINDER MISFIRE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. MULTIPLE CYLINDER MISFIRE DTC sets only if condition occurs during driving cycle.

1. Repair any other DTCs before proceeding. Using scan tool, clear DTCs. Start engine. Allow engine to reach operating temperature. Road test vehicle. Stop vehicle, turn engine off, then on. Go to next step.
2. Start engine. Continue road test. Drive vehicle at various vehicle and engine speeds. Avoid sharp maneuvers. Return to service bay. Stop vehicle. Turn ignition off and go to next step.
3. Turn ignition on. Using scan tool, read DTCs. If MULTIPLE CYLINDER MISFIRE DTC returns, go to step 7). If MULTIPLE CYLINDER MISFIRE DTC does not return, and CYLINDER #1, #2, #3, #4, #5, #6, #7, #8, #9 or #10 MISFIRE DTC returns, perform TEST TC-107A. If no CYLINDER MISFIRE DTCs returns, go to next step. NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer and procedure for pattern analysis.
4. Connect an engine analyzer to engine. Start engine and check secondary ignition pattern. Repair indicated secondary ignition system component as necessary and perform TEST VER-5A. If secondary ignition pattern is okay, go to next step. NOTE: DO NOT spray inductive pick-up.
5. Using a spray bottle, spray ignition cables with water while observing secondary ignition pattern. If pattern changes while spraying water, repair appropriate ignition cable(s) and perform TEST VER-5A. If pattern is okay, go to next step.
6. Condition required to set DTC is not present at this time. MULTIPLE CYLINDER MISFIRE DTC sets when Powertrain Control Module (PCM) senses an absence of spark. Possible causes are: inaccurate vehicle speed sensor reading (too high), defective ignition coil circuit, defective spark plug, defective spark plug cable or connector, defective fuel pump or filter, mechanical engine problem, defective EGR system, defective fuel injectors or connectors, restricted exhaust, low fuel level, restricted intake system, defective PCM power grounds, defective EVAP system or defective PCM. See INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-5A. NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer and procedure for pattern analysis.
7. Inspect ignition cables for proper installation. Repair cable installation as necessary and perform TEST VER-5A. If cables are installed properly, go to next step.
8. Turn ignition off. Connect an engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Go to next step.
9. Set engine analyzer to read display or parade pattern and check secondary ignition pattern while momentarily removing and reinstalling each spark plug wire from ignition coil or distributor. If secondary voltage is not at least 25,000 volts for each wire, replace ignition coil and perform TEST VER-5A. If voltage is as specified, go to next step.
10. Turn ignition off. Remove all spark plugs. Remove Auto Shutdown (ASD) relay. Check engine compression. If cylinder(s) that set DTC is not at least 100 psi and within 25 percent of other cylinders, repair engine mechanical problem as necessary and perform TEST VER-5A. If cylinder(s) test as specified, reinstall spark plugs and go to next step.
11. Turn ignition off. Connect a vacuum gauge to engine vacuum source. Start engine and allow it to reach normal operating temperature. With parking brake on and shift lever in Neutral, read vacuum gauge. If vacuum gauge does not read at least 13 in. Hg, perform TEST NTC-22A. If vacuum gauge reads at least 13 in. Hg, go to next step.
12. While observing vacuum gauge, snap throttle open and closed. If vacuum does not drop rapidly to zero, repair restricted exhaust system and perform TEST VER-5A. If vacuum drops rapidly to zero, turn ignition off and go to next step. WARNING: Fuel system may be under extreme pressure. Release fuel pressure before connecting fuel pressure gauge. See FUEL PRESSURE RELEASE.
13. Release fuel pressure. Connect a fuel pressure gauge to fuel rail. Turn ignition on. Go to next step.
14. Using scan tool, actuate fuel system test. Allow time for fuel pressure gauge to stabilize to normal fuel pressure. Go to next step.
15. Using scan tool, stop fuel system test. Observe fuel pressure gauge for one minute. If fuel pressure drops to less than 10 psi, perform TEST NTC-3A. If fuel pressure does not drop to less than 10 psi, go to next step.
16. Inspect air cleaner and air inlet ducts for restrictions. Clean and repair restrictions as necessary and perform TEST VER-5A. If no restrictions exist, go to next step.
17. Inspect injector wiring and connections. Repair wiring and connectors as necessary and perform TEST VER-5A. If wiring and connectors are okay, go to next step.
18. Perform each test in order listed in REPAIRING MULTIPLE CYLINDER MISFIRE TESTS table. If a test passes, continue to next test until problem is located.

REPAIRING MULTIPLE CYLINDER MISFIRE TESTS

TEST TC-107A - CYLINDER #1, #2, #3, #4, #5, #6, #7, #8, #9 OR #10 MISFIRE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. Repair any other DTCs, including MULTIPLE CYLINDER MISFIRE DTC, before proceeding. Inspect only cylinder(s) that sets DTC.

1. CYLINDER MISFIRE DTC sets when Powertrain Control Module (PCM) senses an absence of spark. Possible causes are: defective ignition coil circuit, defective spark plug, defective spark plug cable or connector, defective fuel pump or filter, mechanical engine problem, defective EGR system, defective fuel injectors or connectors, restricted exhaust, low fuel level, restricted intake system, defective PCM power grounds, defective EVAP system or defective PCM. Go to next step.
2. Inspect ignition cables for proper installation. Repair cable installation as necessary and perform TEST VER-5A. If cable are installed properly, go to next step. NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer and procedure for pattern analysis.
3. Turn ignition off. Connect an engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Go to next step.
4. Set engine analyzer to read display or parade pattern and check secondary ignition pattern while momentarily removing and reinstalling each spark plug wire from ignition coil or distributor. If secondary voltage is not at least 25,000 volts for each wire, replace ignition coil and perform TEST VER-5A. If voltage is as specified, go to next step. NOTE: DO NOT spray inductive pick-up.
5. Using a spray bottle, spray ignition cables with water while observing secondary ignition pattern. If pattern changes while spraying water, repair appropriate ignition cable(s) and perform TEST VER-5A. If pattern is okay, go to next step.
6. Turn ignition off. Remove all spark plugs. Remove Auto Shutdown (ASD) relay. Check engine compression. If cylinder(s) that set DTC is not at least 100 psi and within 25 percent of other cylinders, repair engine mechanical problem as necessary and perform TEST VER-5A. If cylinder(s) test as specified, reinstall spark plugs and go to next step.
7. Turn ignition off. Using scan tool, perform injector kill test while observing scope pattern and engine RPM. If scope pattern or RPM changes while performing injector kill test, repair engine mechanical problem as necessary and perform TEST VER-5A. If engine is okay, replace fuel injector and perform TEST VER-5A. If kill test passes without changes in scope pattern or RPM, turn engine off and go to next step.
8. Connect a vacuum gauge to manifold vacuum source. Start engine and allow it to reach normal operating temperature. With parking brake on and shift lever in Neutral, read vacuum gauge. If vacuum gauge does not read at least 13 in. Hg, perform TEST NTC-18A. If vacuum gauge reads at least 13 in. Hg, go to next step.
9. Check valve train and timing. Replace engine components or correct valve timing as necessary and perform TEST VER-5A. If valve train and timing are okay, replace PCM and perform TEST VER-5A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-107A to TEST TC-112A. No tests have been omitted.

TEST TC-112A - CATALYST 1/1 EFFICIENCY FAILURE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/1 Heated Oxygen Sensor (HO2S) is located in upstream position. On models equipped with 2 upstream HO2S, 1/1 HO2S is located in left upstream position. 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position.

1. Using scan tool, read DTCs. If scan tool displays any HO2S related DTCs, see DTC MESSAGES & CODES table in DTC TEST and perform appropriate test(s). If no HO2S related DTCs are displayed, go to next step.
2. Check if any Technical Service Bulletins (TSBs) apply to vehicle. If a TSB exists, perform corrective action and perform TEST VER-5A. If no TSBs exist, go to next step.
3. CATALYTIC CONVERTER EFFICIENCY FAILURE DTC sets in Powertrain Control Module (PCM) as catalytic converter loses ability to store oxygen and concentration of oxygen becomes the same downstream (after catalytic converter) as upstream (before catalytic converter). Output voltage of downstream O2S becomes the same as upstream O2S with a time lag seen by PCM between switching of O2S. Go to next step.
4. Malfunction Indicator Light (MIL) on instrument panel will illuminate after 2 trips and remain on, but goes off if conditions required to set DTC are not found on subsequent trips. Possible causes are: defective catalytic converter, exhaust leaks before catalytic converter, contaminated fuel or engine mechanical problem. Go to next step.
5. Start engine. Check for exhaust leaks between engine and 1/2 HO2S. Repair exhaust leaks as necessary and perform TEST VER-5A. If no exhaust leaks exist, go to next step.
6. Check for excessive smoke caused by high oil or coolant consumption. Repair engine mechanical condition as necessary, replace catalytic converter and HO2Ss, and perform TEST VER-5A. If engine is okay, go to next step. NOTE: A newly installed 1/2 HO2S with an existing, aging 1/1 HO2S may cause this DTC to be set.
7. If 1/2 HO2S has been not been replaced within last 5000 miles, replace catalytic converter and perform TEST VER-5A. If 1/2 HO2S has been replaced within last 5000 miles, go to next step.
8. If 1/1 HO2S has been replaced within last 5000 miles, replace catalytic converter and perform TEST VER-5A. If 1/1 HO2S has not been replaced within last 5000 miles, replace 1/1 HO2S and perform TEST VER-5A.

TEST TC-113A - EVAP PURGE FLOW MONITOR FAILURE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. Replacing PCM will not correct this problem. Evaporative (EVAP) purge solenoid may also be referred to as EVAP solenoid.

1. Using scan tool, monitor EVAP PURGE SOLENOID state. Start engine. Allow engine to reach normal operating temperature. Go to step 3).
2. Inspect vacuum hoses from throttle body to EVAP canister for leaks or restrictions. Repair vacuum hoses as necessary and perform TEST VER-5A. If vacuum hoses are okay, go to next step.
3. Disconnect EVAP solenoid-to-EVAP canister hose at EVAP solenoid. Ensure no continuous vacuum flow exists through EVAP solenoid while scan tool displays duty cycle more than zero percent. If continuous vacuum flow does not exist, go to step 7). If continuous vacuum flow exists, go to next step. CAUTION: DO NOT use more than 5 psi in following step.
4. Turn ignition off. Disconnect EVAP solenoid-to-EVAP canister vacuum hose at EVAP solenoid. Attempt to blow air through vacuum hose. If air flows, EVAP solenoid and hoses are okay. Test is complete. Perform TEST VER-5A. If air does not flow, perform TEST TC-113B.
5. Disconnect EVAP solenoid-to-EVAP canister vacuum hose at EVAP canister. Attempt to blow air through vacuum hose. If air flows, replace EVAP canister and perform TEST VER-5A. If air does not flow, replace vacuum hose and perform TEST VER-5A.
6. Turn engine off, ignition on. Disconnect EVAP solenoid-to-throttle body hose at EVAP solenoid. Connect a vacuum gauge to disconnected hose. Start engine and allow it to idle. If gauge does not read manifold vacuum, repair restriction in hose, throttle body or intake manifold and perform TEST VER-5A. If gauge reads manifold vacuum, go to next step.
7. Reconnect EVAP solenoid-to-throttle body hose. Connect vacuum gauge to canister side of EVAP solenoid. If vacuum reading is not 3-7 in. Hg, replace EVAP solenoid and perform TEST VER-5A. If vacuum reading is 3-7 in. Hg, go to next step.
8. Connect vacuum pump to EVAP solenoid-to-EVAP canister hose. Apply more than 2 in. Hg vacuum. If canister does not hold more than 2 in. Hg, replace EVAP solenoid and perform TEST VER-5A. If canister holds more than 2 in. Hg, go to next step.
9. Check for plugged hose or vent port on EVAP canister. Repair hose as necessary and perform TEST VER-5A. If vent port is plugged, clean plugged vent port and retest. If no plugs exist, replace EVAP canister and perform TEST VER-5A.

TEST TC-113B - EVAP PURGE FLOW MONITOR FAILURE

Note. Perform TEST TC-113A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. Replacing PCM will not correct this problem. EVAP purge solenoid may also be referred to as EVAP solenoid.

1. Disconnect EVAP solenoid-to-EVAP canister vacuum hose at canister. Attempt to blow air through vacuum hose. If air does not flow, repair or replace vacuum hose and perform TEST VER-5A. if air flows, go to next step.
2. Check for plugged vent port on EVAP canister. If vent port is plugged, repair or clean plugged vent port, retest and perform TEST VER-5A. If no plug exists, replace EVAP canister and perform TEST VER-5A.

TEST TC-114A- PNP SWITCH STUCK IN PARK OR IN GEAR

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read Park/Neutral Position (PNP) switch input state. Move gear selector in and out of Park and Reverse while observing scan tool display. If scan tool does not display P/N and D/R, go to step 4). If scan tool displays P/N and D/R, go to next step.
2. Condition required to set DTC is not present at this time. PARK/NEUTRAL SWITCH FAILURE DTC sets if Powertrain Control Module (PCM) senses an incorrect PNP switch state for a given mode of vehicle operation. Possible causes are: defective connector terminals or connector wires, disconnected wiring harness, defective PNP switch, mechanical transmission problem or defective PCM. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITIONS. Test is complete. Perform TEST VER-2A.
4. Turn ignition off. Place gear selector in Park. Disconnect PCM connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using scan tool in ohmmeter mode, check resistance between ground and PCM Black connector, PNP position switch sense circuit (Black/White wire). Go to next step.
6. Move gear selector in and out of Park and Reverse while observing scan tool display. If resistance switches from less than 10 ohms to more than 10 ohms, replace PCM and perform TEST VER-2A. If resistance does not switch from less than 10 ohms to more than 10 ohms, go to next step.
7. If resistance stays at less than 10 ohms at all times, go to next step. If resistance does not stay at less than 10 ohms at all times, go to step 9).
8. Disconnect PNP switch connector. Check resistance between ground and PCM Black connector, PNP switch sense circuit (Black/White wire). If resistance is less than 5 ohms, repair short to ground in PNP switch sense circuit and perform TEST VER-2A. If resistance is 5 ohms or more, repair or replace stuck PNP switch and perform TEST VER-2A.
9. Disconnect PNP switch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
10. Using an external ohmmeter, check resistance of PNP switch sense circuit (Black/White wire) between PNP switch connector and PCM Black connector. If resistance is less than 5 ohms, replace PNP switch and perform TEST VER-2A. If resistance is 5 ohms or more, repair open PNP switch sense circuit and perform TEST VER-2A.

TEST TC-118A - FUEL SYSTEM 1/1 RICH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read DTCs. If scan tool displays any HO2S related DTCs, see DTC MESSAGES & CODES table in DTC TEST and perform appropriate test(s). If no HO2S related DTCs are displayed, go to next step.
2. Check if any Technical Service Bulletins (TSBs) apply to vehicle. If a TSB exists, perform corrective action and perform TEST VER-5A. If no TSBs exist, go to next step.
3. FUEL SYSTEM RICH DTC sets if Powertrain Control Module (PCM) senses fuel system is running too rich on 2 sequential trips. Possible causes are: defective catalytic converter, defective PCM, engine wear, defective fuel injectors, defective MAP sensor, defective upstream Heated Oxygen Sensor (HO2S), defective fuel pressure regulator, or defective connector terminals or connector wires. Go to next step.
4. Perform TEST TC-103A. If test fails, perform appropriate repair procedure indicated in test. Test is complete. If test passes, go to next step.
5. Turn engine off. Turn ignition on, engine off. Using scan tool, read LONG TERM ADAPTIVE MEMORY value. If value is not between -20 and -38 percent, condition required to set DTC is no longer present. Test is complete. Perform TEST VER-5A. If value is as specified, perform TEST TC-118B.

TEST TC-118B - FUEL SYSTEM 1/1 RICH

Note. Perform TEST TC-118A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-5A. If wiring and connectors are okay, go to next step.
2. Perform each test in order listed in REPAIRING FUEL SYSTEM RICH TESTS table. If a test passes, continue to next test until problem is located.

REPAIRING FUEL SYSTEM RICH TESTS

TEST TC-119A - FUEL SYSTEM 1/1 LEAN

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. Very low fuel level could cause FUEL SYSTEM LEAN DTC to set. Ensure fuel tank is at least 1/4 full.

1. If vehicle ran out of fuel shortly before FUEL SYSTEM LEAN DTC set, ensure fuel tank is at least 1/4 full. Using scan tool, erase DTCs and perform TEST VER-5A. If vehicle did not run out of fuel shortly before DTC set, ensure fuel tank is at least 1/4 full and go to next step.
2. FUEL SYSTEM LEAN DTC sets if Powertrain Control Module (PCM) senses fuel system is running too lean on 2 sequential trips. Possible causes are: defective ignition coil, defective PCM, engine wear, defective exhaust manifold, defective fuel pump, defective fuel filter, defective ignition secondary wires, defective injectors, defective MAP sensor, defective upstream Heated Oxygen Sensor (HO2S), defective fuel pressure regulator, defective fuel pump relay, defective spark plugs, or defective connector terminals or connector wires. Go to next step.
3. Using scan tool, read DTCs. Repair any other DTCs before proceeding. See DTC MESSAGES & CODES table in DTC TEST and perform appropriate test(s). If no other DTCs exist, go to next step.
4. Check if any Technical Service Bulletins (TSBs) apply to vehicle. If a TSB exists, perform corrective action and perform TEST VER-5A. If no TSBs exist, go to next step.
5. Start engine. Allow engine to reach normal operating temperature. Allow engine to idle for 20 seconds after warm-up. Inspect exhaust system between engine and upstream HO2S for leaks. Repair exhaust system as necessary and perform TEST VER-5A. If exhaust system is okay, go to next step.
6. Using scan tool, monitor 1/1 O2 SENSOR state for at least 20 seconds. If state is switching between LEAN-CENTER-LEAN 2 or more time in 20 seconds, condition required to set DTC is no longer present. Test is complete. Perform TEST VER-5A. If state does not switch as specified, go to next step
7. Using scan tool, read LONG TERM ADAPTIVE MEMORY value. If value is not 20-32 percent, condition required to set DTC is no longer present. Test is complete. Perform TEST VER-5A. If value is as specified, perform TEST TC-119B.

TEST TC-119B - FUEL SYSTEM 1/1 LEAN

Note. Perform TEST TC-119A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in WIRING DIAGRAMS article.

1. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-5A. If wiring and connectors are okay, go to next step.
2. Perform each test in order listed in REPAIRING FUEL SYSTEM LEAN TESTS table. If a test passes, continue to next test until problem is located.

REPAIRING FUEL SYSTEM LEAN TESTS

TEST TC-120B - FUEL 2/1 SYSTEM RICH

Note. Perform TEST TC-120A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-5A. If wiring and connectors are okay, go to next step.
2. Perform each test in order listed in REPAIRING FUEL SYSTEM RICH TESTS table. If a test passes, continue to next test until problem is located.

REPAIRING FUEL SYSTEM RICH TESTS

TEST TC-121B - FUEL SYSTEM 2/1 LEAN

Note. Perform TEST TC-121A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Inspect all related wiring and connectors for damage. Repair wiring and connectors as necessary and perform TEST VER-5A. If wiring and connectors are okay, go to next step.
2. Perform each test in order listed in REPAIRING FUEL SYSTEM LEAN TESTS table. If a test passes, continue to next test until problem is located.

REPAIRING FUEL SYSTEM LEAN TESTS

TEST TC-122A - 2/1 O2 SENSOR SLOW RESPONSE

Note. This test applies to BR body equipped with medium duty and heavy duty engines only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. O2 SENSOR SLOW RESPONSE DTC sets if 2/1 Heated Oxygen Sensor (HO2S) voltage is switches from less than 0.27 volt to more than 0.62 volt fewer times than required. Possible causes are: exhaust leak, fuel contamination, HO2S heater failure, defective O2S, defective wiring or connectors, or engine mechanical problems. Go to next step.
2. Start engine. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary and perform TEST VER-5A. If exhaust system is okay, go to next step.
3. Check exhaust for excessive smoke caused by oil or coolant consumption. Repair engine mechanical condition as necessary, replace catalytic converter and HO2Ss, and perform TEST VER-5A. If engine mechanical condition is okay, go to next step.
4. Turn ignition off. Disconnect 2/1 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and 2/1 HO2S connector, ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, repair open sensor ground circuit and perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
6. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A. If connectors and terminals are okay, replace 2/1 HO2S and perform TEST VER-5A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-122A to TEST TC-124A. No tests have been omitted.

TEST TC-124A - 2/1 O2 SENSOR HEATER FAILURE

Note. This test applies to BR body equipped with medium duty and heavy duty engines only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. Allow Heated Oxygen Sensor (HO2S) to cool to room temperature before checking resistance.

Note. 2/1 HO2S is located in right upstream position on models with 2 upstream HO2S.

1. Turn ignition on, engine off. Wait 3 minutes. Using scan tool in SENSORS, monitor 2/1 HO2S voltage. Wait for voltage to stabilize at more than 4.5 volts. Go to next step.
2. Using scan tool in ACTUATOR TESTS, perform HO2S heater test. Monitor 2/1 HO2S voltage for 2 minutes. If voltage is more than one volt, go to step 4). If voltage is one volt or less, go to next step.
3. Condition required to set DTC is not present at this time. O2 SENSOR HEATER FAILURE DTC sets if Powertrain Control Module (PCM) senses HO2S voltage at more than 3 volts for 30-90 seconds after a cold engine start. Possible causes are: open HO2S heater element circuit, HO2S failure, HO2S heater wiring failure, PCM failure, defective connections or wiring. Stop all actuator tests. Test is complete.
4. Disconnect 2/1 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
5. Ensure scan tool is actuating HO2S heater test. Using an external voltmeter, check voltage on HO2S ASD relay output circuit (Dark Green/Orange wire). If voltage is 10 volts or less, repair open ASD relay output circuit and perform TEST VER-5A. If resistance is more than 10 volts, go to next step.
6. Stop all actuator tests. Using an external ohmmeter, check resistance between HO2S (component side), ASD relay output circuit (White wire) and heater ground circuit (White wire). (Scheme 43) If resistance is not 4-7 ohms, replace 2/1 HO2S and perform TEST VER-5A. If resistance is 4-7 ohms, go to next step.
7. Check resistance between ground and HO2S connector, heater ground circuit (Black/White wire). If resistance is 5 ohms or more, repair open heater ground circuit and perform TEST VER-5A. If resistance is less than 5 ohms, replace 2/1 HO2S and perform TEST VER-5A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-124A to TEST TC-126A. No tests have been omitted.

TEST TC-126A - 1/2 O2 SENSOR SHORTED TO VOLTAGE

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position.

1. Warm engine to normal operating temperature. Wait 5 minutes with engine running. Using scan tool, read 1/2 HO2S voltage. If voltage is 4.97 volts or less, go to step 4). If voltage is more than 4.97 volts, go to next step.
2. Disconnect 1/2 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
3. Using scan tool, read 1/2 HO2S voltage. If voltage is 4.97 volts or less, replace 1/2 HO2S and perform TEST VER-2A. If voltage is more than 4.97 volts, repair short to voltage in 1/2 HO2S signal circuit and perform TEST VER-5A. See 1/2 HO2S SIGNAL CIRCUIT IDENTIFICATION table. 1/2 HO2S SIGNAL CIRCUIT IDENTIFICATION Application Wire Color BR Body Tan/Red
4. With engine still at idle, wiggle wiring harness and connector at 1/2 HO2S while monitoring 1/2 HO2S voltage. If voltage increases to more than 1.2 volts at any time when moving wiring harness, repair wiring harness and connector for short to voltage as necessary and perform TEST VER-5A. If voltage does not increase to more than 1.2 volts at any time, go to next step.
5. Condition required to set DTC is not present at this time. DOWNSTREAM or PRE-CATALYST O2 SENSOR SHORTED TO VOLTAGE DTC sets if 1/2 HO2S voltage is more than 1.2 volts. Possible causes are: 1/2 HO2S output circuit shorted to another circuit, dirty/wet connection causing voltage tracking to another connection, defective 1/2 HO2S, defective Powertrain Control Module (PCM) or defective wiring or connectors. Go to next step.
6. Turn ignition off. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-5A. If wiring and connectors are okay, test is complete. Perform TEST VER-5A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-126A to TEST TC-128A. No tests have been omitted.

TEST TC-128A - CLOSED LOOP TEMPERATURE NOT REACHED

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. The following test is invalid if thermostat is stuck open.

1. Check thermostat operation. Replace thermostat if necessary and perform TEST VER-2A. if thermostat is operating correctly, go to next step.
2. CLOSED LOOP TEMP NOT REACHED DTC sets if engine temperature does not reach more than 18°F (-7.7°C) within 10 minutes of engine start. Possible causes are: defective thermostat, defective Engine Coolant Temperature (ECT) sensor, extremely cold ambient temperature, defective PCM, defective connector terminals or connector wires. Go to next step.
3. Using scan tool temperature probe, check engine temperature. Run engine until engine temperature reaches more than 80°F (26.6°C). Turn ignition off and go to next step.
4. Turn ignition off. Disconnect ECT sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance across ECT sensor. If resistance is 11,000 ohms or more, replace ECT sensor and perform TEST VER-2A. If resistance is less than 11,000 ohms, go to next step.
6. Disconnect Powertrain Control Module (PCM) connectors. Inspect PCM connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, replace PCM and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-128A to TEST TC-132A. No tests have been omitted.

TEST TC-132A - TPS VOLTAGE DOES NOT AGREE WITH MAP

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read DTCs. If scan tool displays any MAP sensor related DTCs, see DTC MESSAGES & CODES table in DTC TEST and perform appropriate test(s). If no MAP sensor related DTCs are displayed, go to next step.
2. Using scan tool, read MAP sensor voltage. If voltage is less than 3.5 volts, perform TEST NTC-6A. If voltage is 3.5 volts or more, go to next step.
3. Start engine. Using scan tool, read MAP sensor voltage. If voltage does not drop from more than 3.5 volts to less than 2.0 volts, perform TEST NTC-6A. If voltage drops from more than 3.5 volts to less than 2.0 volts, go to next step.
4. TPS VOLTAGE DOES NOT AGREE WITH MAP DTC sets if proper Throttle Position (TP) sensor voltage is not present after 4 seconds when 2 predetermined conditions are met. Possible causes are: defective PCM, defective TP sensor, mechanical failure, defective connector terminals or connector wires, miswired connector terminals, defective vehicle speed sensor or defective MAP sensor. Go to next step.
5. With throttle linkage at idle position, check throttle plate and linkage for binding. Repair throttle plate and linkage as necessary. If throttle plate and linkage are okay, go to next step. NOTE: If TP sensor 5-volt supply circuit and ground circuit are switched at TP sensor connector or at PCM connector, TPS VOLTAGE DOES NOT AGREE WITH MAP DTC will set.
6. Disconnect TP sensor connector. Ensure appropriate wire is installed in correct TP sensor connector terminal. For appropriate wire color, see CONNECTOR IDENTIFICATION. Inspect connector and terminals for damage. Repair connector and terminals as necessary. If connector and terminals are okay, go to next step.
7. Using scan tool in voltmeter mode, check voltage on TP sensor connector, 5-volt supply circuit. If voltage is less than 5 volts, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is 5 volts or more, go to next step.
8. Reconnect TP sensor connector. Turn ignition on. Using scan tool, read TP sensor voltage. If voltage is more than one volt, replace TP sensor and perform TEST VER-2A. If voltage is one volt or less, go to next step.
9. Slowly open and close throttle while monitoring scan tool display. If voltage does not change smoothly when throttle is opened and closed, replace TP sensor and perform TEST VER-2A. If voltage changes smoothly, go to next step.
10. Open throttle to wide open throttle position while monitoring scan tool display. If voltage is 3.5 volts or less, replace TP sensor and perform TEST VER-2A. If voltage is more than 3.5 volts, go to next step.
11. Wiggle TP sensor connector and harness while observing scan tool display. If voltage changes while wiggling connector and harness, repair connector or harness that caused voltage to change and perform TEST VER-2A. If voltage does not change while wiggling TP sensor connector and harness, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-132A to TEST TC-138A. No tests have been omitted.

TEST TC-138A - TARGET IDLE NOT REACHED

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn engine off, ignition on. With throttle linkage at idle position and throttle plate fully closed against its stop, check throttle plate and linkage for binding. Repair throttle plate and linkage as necessary and perform TEST VER-2A. If throttle linkage and plate are okay, go to next step.
2. Start engine. Allow engine to idle for 60 seconds. If vehicle is equipped with automatic transmission, set parking brake, depress brake pedal and put gear selector in Drive. Go to next step.
3. Use scan tool to read TARGET IDLE and engine speed (RPM). If engine RPM is within -100 or +200 RPM of target idle, go to step 8). If engine RPM is not within specification, go to next step. NOTE: The following test step is invalid if engine has any vacuum leaks.
4. Check engine, brake booster and vacuum hoses for leaks. Ensure PCV valve is operating properly. Repair vacuum leaks or replace PCV valve as necessary and perform TEST VER-2A. If no vacuum leaks exist and PCV valve is operating properly, go to next step.
5. Using scan tool, actuate IAC wiggle test. Idle Air Control (IAC) motor should raise and lower idle speed with scan tool display. If IAC motor does not operate as specified, perform TEST TC-25A. If IAC motor operates as specified, perform TEST TC-138B.
6. Condition required to set DTC is not present at this time. TARGET IDLE NOT REACHED DTC sets if PCM senses target idle is not within 200 RPM of target idle for 2.96 milliseconds. Possible causes are: IAC driver circuit shorted to ground, IAC driver circuit shorted to battery, IAC driver circuits shorted together, defective PCM, IAC motor shorted internally, carbon deposits, open driver circuit, defective connector terminals or connector wires. Go to next step.
7. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
8. Start engine. Using scan tool, actuate IAC wiggle test. Idle Air Control (IAC) motor should raise and lower idle speed with scan tool display. If IAC motor does not operate as specified, perform TEST TC-25A. If IAC motor operates as specified, go to next step.
9. Wiggle wiring harness from IAC motor to PCM. Observe for IAC motor to stop operating. If IAC motor stops operating, repair harness where wiggling caused motor to stop and perform TEST VER-2A. If IAC motor continues to operate, go to next step.
10. Stop IAC motor wiggle test. See INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.

TEST TC-138B - TARGET IDLE NOT REACHED

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect PCV valve hose from intake manifold. Cap vacuum port at intake manifold. Disconnect idle purge hose from throttle body. Install Orifice Tool (6714) on idle purge hose port at throttle body. Go to next step.
2. Start engine. Allow engine to reach operating temperature. Using scan tool, actuate MIN AIRFLOW. If engine speed is 550 RPM or more, replace throttle body and perform TEST VER-2A. If engine speed is less than 550 RPM, go to next step. WARNING: Clean throttle body in well ventilated area and wear rubber gloves.
3. Remove throttle body. While holding throttle open, spray entire throttle body bore with carburetor/throttle body cleaner. Using soft scuff pad, clean throttle body bore and throttle plate. Using compressed air, dry throttle body. Install throttle body and go to next step.
4. Start engine. Allow engine idle to stabilize. Using scan tool, actuate MIN AIRFLOW. If engine speed is less than 550 RPM, replace throttle body and perform TEST VER-2A. If engine speed is 550 RPM or more, test is complete. Perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-138B to TEST TC-140A. No tests have been omitted.

TEST TC-140A - EGR SYSTEM FAILURE

Note. This test applies to vehicles equipped with diesel engines only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Start engine and allow it to idle. Using scan tool in EGR SYSTEM TEST mode, press No. 2 on scan tool key pad to block EGR flow. Monitor Intake Air Temperature (IAT) sensor temperature until it stabilizes. Go to next step.
2. Press No. 3 on scan tool key pad to actuate EGR solenoid, and allow EGR to flow. Monitor IAT temperature sensor. If temperature does not increase after EGR is actuated, go to step 5). If temperature increases after EGR is actuated, go to next step.
3. Condition required to set DTC is not present at this time. EGR SYSTEM FAILURE DTC sets if PCM energizes EGR solenoid and no significant change in IAT occurs. Possible causes are: open or blocked EGR valve vacuum supply, blocked exhaust transfer tube to intake manifold, failed EGR valve, failed PCM, failed connectors and terminals, or failed EGR solenoid or transducer. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If connectors and terminals are okay, test is complete. Perform TEST VER-2A.
5. Disconnect vacuum supply hose at EGR solenoid. If vacuum does not exist at EGR solenoid, repair vacuum supply as necessary and perform TEST VER-2A. If vacuum exists, go to next step.
6. Reconnect vacuum supply hose. Disconnect EGR solenoid-to-EGR valve vacuum supply hose at EGR solenoid. Ensure EGR solenoid is still actuating. If EGR solenoid is not allowing vacuum to pass through, replace EGR solenoid and perform TEST VER-2A. If vacuum is passing through, go to next step.
7. Reconnect vacuum supply hose at EGR solenoid and disconnect it at EGR valve. If vacuum does not exist at EGR valve, repair vacuum hose or check valve as necessary and perform TEST VER-2A. If vacuum exists, go to next step.
8. Remove EGR valve. Connect a vacuum pump to EGR valve. Slowly apply 10 in. Hg while observing EGR valve poppet. If poppet does not start to open at 10 in. Hg, replace EGR valve and perform TEST VER-2A. If poppet opens, inspect EGR tube, and intake and exhaust manifolds for carbon build-up and repair as necessary. Retest EGR system.

TEST TC-141A - GOVERNOR PRESSURE NOT EQUAL TO TARGET @ 15-20 PSI

Note. This test applies to vehicles equipped with Automatic Transmission (A/T) only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read DTCs. Repair any other A/T related DTCs before proceeding. See DTC MESSAGES & CODES table in DTC TEST and perform appropriate test(s). If no other A/T related DTCs exist, go to next step.
2. Start engine. Allow engine to reach operating temperature. Set parking brake, depress brake pedal and put gear selector in Drive. Go to next step.
3. Using scan tool, read governor pressure sensor value. If value is more than 3 psi, perform TEST TC-141B. If value is 3 psi or less, go to next step. NOTE: Removing Transmission (TRANS) control relay in following step may set other DTCs. Disregard these DTCs.
4. Put gear selector in Neutral. With engine still running, remove TRANS control relay. Depress brake pedal and put gear selector in Drive. Read governor pressure sensor value. If value is not 30-55 psi, perform TEST TC-141C. If value is as specified, go to next step.
5. Turn engine off. Install TRANS control relay. Drive vehicle at 25-30 MPH. Using scan tool, monitor governor actual pressure and target pressure. If pressures do not stay consistently within 5 psi of each other, go to step 7). If pressures stay consistently within 5 psi of each other, go to next step.
6. Condition required to set DTC is not present at this time. See INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
7. Replace governor pressure solenoid. Drive vehicle at 25-30 MPH. Using scan tool, monitor governor actual pressure and target pressure. If pressures do not stay consistently within 5 psi of each other, repair internal A/T leakage problem and perform TEST VER-2A. If pressures stay consistently within 5 psi of each other, test is complete.

TEST TC-141B - GOVERNOR PRESSURE NOT EQUAL TO TARGET @ 15-20 PSI

Note. Perform TEST TC-141A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Install a pressure gauge at transmission governor pressure port. (Scheme 44) Start engine. With gear selector in Drive, read gauge pressure. If pressure is less than 5 psi, perform TEST TC-141D. If pressure is 5 psi or more, go to next step.
2. Turn engine off. Drain and remove transmission oil pan. Inspect pan for burnt oil and debris. Repair transmission as necessary and perform TEST VER-2A. If transmission is okay, go to next step.
3. Replace governor pressure solenoid. Start engine. Read gauge pressure. If pressure is less than 5 psi, test is complete. Perform TEST VER-2A. If pressure is 5 psi or more, replace valve body and perform TEST VER-2A.

Identifying Transmission Test Ports. Scheme 44

TEST TC-141C - GOVERNOR PRESSURE NOT EQUAL TO TARGET @ 15-20 PSI

Note. Perform TEST TC-141A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Install transmission control relay. Install a pressure gauge at governor pressure port. (Scheme 44) Start engine and go to next step.
2. Remove transmission control relay. Depress brake pedal and put gear selector in Drive. Read gauge pressure. If pressure is 40-55 psi, perform TEST TC-141D. If pressure is not as specified, go to next step.
3. Turn engine off. Install transmission control relay. Drain and remove transmission oil pan. Inspect pan for burnt oil and debris. Repair transmission as necessary and perform TEST VER-2A. If transmission is okay, go to next step.
4. Replace governor pressure solenoid. Start engine. Remove transmission control relay. Depress brake pedal and put gear selector in Drive. Read gauge pressure. If pressure 40-55 psi, test is complete. Perform TEST VER-2A. If pressure is not 40-55 psi, replace valve body and perform TEST VER-2A.

TEST TC-141D - GOVERNOR PRESSURE NOT EQUAL TO TARGET @15-20 PSI

Note. Perform TEST TC-141A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn engine off. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Turn ignition on. Using scan tool in voltmeter mode, check voltage on transmission solenoid connector, 5-volt supply circuit (Orange wire). If voltage is 4.5 volts or less, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is more than 4.5 volts, replace governor pressure sensor and perform TEST VER-2A.

TEST TC-142A - GOVERNOR PRESSURE ABOVE 3 PSI IN GEAR WITH 0 MPH

Note. This test applies to vehicles equipped with Automatic Transmission (A/T) only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read DTCs. Repair any other A/T related DTCs before proceeding. See DTC MESSAGES & CODES table in DTC TEST and perform appropriate test(s). If no other A/T related DTCs exist, go to next step.
2. Using scan tool, erase DTCs. Start engine. Allow engine to reach operating temperature. With engine running, depress brake pedal and put gear selector in Drive. Go go to next step.
3. Using scan tool, read governor pressure sensor value. If pressure is more than 3 psi, perform TEST TC-142B. If pressure is 3.5 psi or less, go to next step.
4. Drive vehicle at 25-30 MPH. Using scan tool, monitor governor actual pressure and target pressure. If pressures do not stay consistently within 5 psi of each other, go to step 6). If pressures stay consistently within 5 psi of each other, go to next step.
5. Condition required to set DTC is not present at this time. See INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
6. Replace governor pressure solenoid. Drive vehicle at 25-30 MPH. Using scan tool, monitor governor actual pressure and target pressure. If pressures do not stay consistently within 5 psi of each other, repair internal A/T leakage problem and perform TEST VER-2A. If pressures stay consistently within 5 psi of each other, test is complete.

TEST TC-142B - GOVERNOR PRESSURE ABOVE 3 PSI IN GEAR WITH 0 MPH

Note. Perform TEST TC-142A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Install a pressure gauge at governor pressure port. (Scheme 44) Start engine. With gear selector in Drive, read gauge pressure. If pressure is less than 3 psi, go to step 4). If pressure is 3 psi or more, go to next step.
2. Turn engine off. Drain and remove transmission oil pan. Inspect pan for burnt oil and debris. Repair transmission as necessary and perform TEST VER-2A. If transmission is okay, go to next step.
3. Replace governor pressure solenoid. Start engine. Read gauge pressure. If pressure is less than 3 psi, test is complete. Perform TEST VER-2A. If pressure is 3 psi or more, replace valve body and perform TEST VER-2A.
4. Turn engine off. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
5. Turn ignition on. Using scan tool in voltmeter mode, check voltage on transmission solenoid connector, 5-volt supply circuit (Orange wire). If voltage is 4.5 volts or less, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is more than 4.5 volts, replace governor pressure sensor and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-142B to TEST TC-144A. No tests have been omitted.

TEST TC-148A - TORQ CONV CLU NO, RPM DROP AT LOCKUP

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read DTCs. If any DTC listed in TORQUE CONVERTOR CLUTCH (TCC) TESTS table is present, perform appropriate test(s). If no DTCs are present, go to next step. TORQUE CONVERTOR CLUTCH (TCC) TESTS DTC Message Test THROTTLE POSITION SENSOR VOLTAGE TOO LOW TC-26A THROTTLE POSITION SENSOR VOLTAGE TOO HIGH TC-27A PCM FAILURE EEPROM WRITE DENIED TC-49A TORQUE CONVERTOR CLUTCH SOLENOID TC-12A MISFIRE (1) * NO CRANK REFERENCE SIGNAL AT PCM TC-40A (1) Perform appropriate misfire DTC test.
2. Check transmission fluid for proper level and for any debris. Fill or repair transmission as necessary and perform TEST VER-2A. If fluid level and condition are okay, go to next step.
3. Start engine. Using scan tool perform TCC system test. If vehicle does not stall, go to step 8). If vehicle stalls, go to next step.
4. Using scan tool, perform GOV and 3-4 shift test. Select 4th gear. If vehicle stalls, perform TEST TC-148B. If vehicle does not stall, go to next step.
5. Turn engine off. Drain and remove transmission oil pan. Inspect pan for burnt oil and debris. Repair transmission as necessary and perform TEST VER-2A. If transmission is okay, go to next step.
6. Conditions required to set DTC are not present at this time. TORQ CONV CLU, NO RPM DROP AT LOCKUP DTC sets if torque converter does not lock up properly when desired. Possible causes are: drive wheel size larger than standard size or smaller than spare wheel size, low TRANS oil level or pressure, debris in transmission oil, PTU solenoid not securely connected or stuck, defective lock-up valve, hydraulic leak at torque converter lock-up clutch, worn out friction materials, defective gear box or differential, defective PCM, defective connectors or wires. Go to next step.
7. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If connectors and terminals are okay, test is complete. Perform TEST VER-2A.
8. Connect a pressure gauge to transmission cooler OUT port. Start engine. Using scan tool, perform TCC system test. If pressure increases when TCC is actuated, replace torque converter and perform TEST VER-2A. If pressure does not increase, repair leaks or blockage in hydraulic circuit, or repair valve body. Perform TEST VER-2A.

TEST TC-148B - TORQ CONV CLU NO, RPM DROP AT LOCKUP

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Using scan tool, perform GOV and 3-4 shift test. Select 4th gear. If vehicle stalls, repair internal transmission problem. Check for blocked passage(s). Perform TEST VER-2A. If vehicle does not stall, test is complete. Perform TEST VER-2A.

TEST TC-148C - TORQ CONV CLU NO, RPM DROP AT LOCKUP

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Road test vehicle while monitoring TCC state and engine RPM. If RPM drops when TCC is ON, go to step 6). If RPM does not drop, go to next step.
2. Turn engine off. Drain and remove transmission oil pan. Inspect pan for burnt oil and debris. Repair transmission as necessary and perform TEST VER-2A. If transmission is okay, go to next step.
3. Replace TCC solenoid. Using scan tool, erase DTCs. Road test vehicle while monitoring throttle angle with scan tool. Go to next step.
4. Accelerate vehicle to 60 MPH maintaining a constant 20 degree throttle angle. Repeat procedure 4 times. Turn ignition off. Repeat procedure 2 times. go to next step.
5. Turn ignition off. Turn ignition on, engine off. Using scan tool, read DTCs. If TORQ CONV CLU, NO RPM DROP AT LOCKUP DTC returns, replace torque converter and perform TEST VER-2A. If DTC does not return, test is complete. Perform TEST VER-2A.
6. Turn engine off. Drain and remove transmission oil pan. Inspect pan for burnt oil and debris. Repair transmission as necessary and perform TEST VER-2A. If transmission is okay, no problem is found at this time. Test is complete. Perform TEST VER-2A.

TEST TC-149A - FUEL LEVEL SENDING UNIT VOLTS TOO LOW

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read fuel level sending unit voltage. If voltage is less than 0.1 volt, go to step 5). If voltage is not as specified, go to next step.
2. Wiggle connectors and harness at fuel pump module while observing scan tool display. If voltage changes while wiggling connectors and harness, repair connector or harness that caused voltage change and perform TEST VER-2A. If voltage does not change, go to next step.
3. Condition required to set DTC is not present at this time. FUEL LEVEL SENDING UNIT VOLTAGE TOO LOW DTC sets if Powertrain Control Module (PCM) senses less than 0.1 volt, for 2 seconds while ignition is on. Possible causes are: fuel level sensor signal shorted to ground, defective fuel level sending unit, loss of ignition switch output voltage, defective instrument cluster circuit board, defective PCM, defective connector terminals or connector wires. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, test is complete. Perform TEST VER-2A.
5. Disconnect fuel pump module connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary. If connector and terminals are okay, go to next step.
6. Using scan tool, read fuel level sending unit voltage. If voltage is more than 3.0 volts, replace fuel pump module and perform TEST VER-2A. If voltage is not as specified, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between ground and PCM Gray connector, fuel level sensor OBD-II signal circuit (Dark Blue wire). If resistance is less than 5 ohms, repair short to ground in fuel level sensor OBD-II signal circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
9. Check resistance between PCM Gray connector, fuel level sensor OBD-II signal circuit (Dark Blue wire) and PCM Black connector, sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair fuel level sensor OBD-II signal circuit for a short to sensor ground circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.

TEST TC-150A - FUEL LEVEL SENDING UNIT VOLTS TOO HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read fuel level sending unit voltage. If voltage is more than 4.37 volts, go to step 5). If voltage is not as specified, go to next step.
2. Wiggle connectors and harness at fuel pump module while observing scan tool display. If voltage changes while wiggling connectors and harness, repair connector or harness that caused voltage change and perform TEST VER-2A. If voltage does not change, go to next step.
3. Condition required to set DTC is not present at this time. FUEL LEVEL SENDING UNIT VOLTAGE TOO HIGH DTC sets if Powertrain Control Module (PCM) senses more than 4.37 volts for 2 seconds while ignition is on. Possible causes are: open fuel level sensor signal, defective fuel level sending unit, defective PCM, defective connector terminals or connector wires. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, test is complete. Perform TEST VER-2A.
5. Disconnect fuel pump module connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary. If connector and terminals are okay, go to next step.
6. Use scan tool to check voltage on fuel level sensor OBD-II signal circuit (Dark Blue wire). If voltage is more than 4.7 volts, repair signal circuit for short to voltage and perform TEST VER-2A. If voltage is 4.7 volts or less, go to next step.
7. Connect a jumper wire between fuel pump connector, fuel level sensor OBD-II signal circuit (Dark Blue wire) and sensor ground circuit (Black/Light Blue wire). Go to next step.
8. Using scan tool, read fuel level sending unit voltage. If voltage is less than one volt, replace fuel pump module and perform TEST VER-2A. If voltage is one volt or more, go to next step.
9. Move jumper wire from fuel pump connector, sensor ground circuit (Black/Light Blue wire) to ground. If voltage is less than one volt, repair open sensor ground circuit and perform TEST VER-2A. if voltage is one volt or more go to next step.
10. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
11. Using an external ohmmeter, check resistance of fuel level sensor OBD-II signal circuit (Dark Blue wire) between PCM Gray connector and fuel pump module connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open fuel level sensor OBD-II signal circuit and perform TEST VER-2A.

TEST TC-151A - FUEL LEVEL UNIT NO CHANGE OVER MILES

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Ensure fuel tank is 1/4 full. Using scan tool, read and note fuel level sending unit voltage. If voltage is less than 0.1 volt, perform TEST TC-149A. If voltage is more than 4.37 volts, perform TEST TC-150A. Go to next step.
2. If voltage is not 2.5-4.37 volts, go to step 6). If voltage is as specified, add 5 gallons of fuel to fuel tank. Go to next step.
3. Using scan tool, read fuel level sending unit voltage. If voltage does not decrease by at least 0.2 volt, replace fuel pump module and perform TEST VER-2A. If voltage decreases by at least 0.2 volt, go to next step.
4. Condition required to set DTC is not present at this time. FUEL LEVEL UNIT NO CHANGE OVER MILES DTC sets if Powertrain Control Module (PCM) does not sense fuel level signal circuit voltage change a calibrated amount over a calculated number of miles. Possible causes are: open sensor signal circuit, defective fuel level sending unit, defective PCM, or defective connections or wiring. Go to next step.
5. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, test is complete. Perform TEST VER-2A.
6. Go to next step.
7. If voltage is not 0.1-2.5 volts, go to step 9). If voltage is as specified, go to next step.
8. Remove at least 5 gallons of fuel from fuel tank. Using scan tool, read fuel level sending unit voltage. If voltage does not increase by at least 0.2 volt, replace fuel pump module and perform TEST VER-2A. If voltage increases by at least 0.2 volt, go to next step.
9. Condition required to set DTC is not present at this time. FUEL LEVEL SENDING UNIT NO CHANGE OVER MILES DTC sets if Powertrain Control Module (PCM) does not sense fuel level signal circuit voltage change a calibrated amount over a calculated number of miles. Possible causes are: open sensor signal circuit, defective fuel level sending unit, defective PCM, or defective connections or wiring. Go to next step.
10. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, test is complete. Perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-151A to TEST TC-153A. No tests have been omitted.

TEST TC-153A - BATTERY TEMP SENSOR VOLTAGE TOO LOW/TOO HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read Battery Temperature (BT) sensor voltage. If voltage is less than 0.4 volt, go to step 5). If voltage is more than 4.9 volts, perform TEST TC-153B. If voltage is 0.4-4.9 volts, go to next step.
2. Wiggle connectors and harness from BT sensor to Powertrain Control Module (PCM) while observing scan tool display. If voltage changes while wiggling connectors and harness, repair connector or harness that caused voltage change and perform TEST VER-2A. If voltage does not change, go to next step.
3. Condition required to set DTC is not present at this time. BATTERY TEMP SENSOR VOLTAGE TOO HIGH or TOO LOW DTC sets if PCM senses voltage from BT sensor to be either less than 0.5 volt or more than 4.9 volts for 3 seconds with ignition on. Possible causes are: defective PCM, defective connector terminals, defective BT sensor or connector wires. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Disconnect BT sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary. If connector and terminals are okay, go to next step.
6. Using scan tool, read BT sensor voltage. If voltage is more than 4 volts, replace BT sensor and perform TEST VER-2A. If voltage is 4 volts or less, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between ground and BT sensor connector, BT sensor signal circuit (Pink/Yellow wire). If resistance is less than 5 ohms, repair short to ground in BT sensor signal circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
9. Check resistance between BT sensor connector, BT sensor signal circuit (Pink/Yellow wire) and sensor ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A. If resistance is less than 5 ohms, repair short to ground in sensor signal circuit and perform TEST VER-2A.

TEST TC-153B - BATTERY TEMP SENSOR VOLTAGE TOO LOW/TOO HIGH

Note. Perform TEST TC-153A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Disconnect Battery Temperature (BT) sensor connector. Using an external voltmeter, check voltage on BT sensor connector, BT sensor signal circuit (Pink/Yellow wire). If voltage is more than 6 volts, repair BT sensor circuit for short to voltage. Perform TEST VER-2A. If resistance is 6 volts or less, go to next step.
2. Connect a jumper wire between BT sensor connector, BT sensor signal circuit (Pink/Yellow wire) and ground circuit (Black/Light Blue wire). Go to next step.
3. Using scan tool, read BT sensor voltage. If voltage is less than one volt, replace BT sensor and perform TEST VER-2A. If voltage is one volt or more, go to next step.
4. Move jumper wire from BT sensor connector, ground circuit (Black/Light Blue wire) to ground. Read BT sensor voltage. If voltage is less than one volt, repair open ground circuit and perform TEST VER-2A. If voltage is one volt or more, go to next step.
5. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
6. Using an external ohmmeter, check resistance of BT sensor signal circuit (Pink/Yellow wire) between BT sensor connector and PCM Gray connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or more, repair open BT sensor signal circuit and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-153B to TEST TC-155A. No tests have been omitted.

TEST TC-155A - 1/1 O2 SENSOR VOLTAGE SHORTED TO GROUND

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/1 HO2S is located in upstream position. On models with 2 upstream HO2S, 1/1 HO2S is located in left upstream position.

1. UPSTREAM O2S VOLTAGE SHORTED TO GROUND DTC sets if PCM senses 1/1 Heated Oxygen Sensor (HO2S) voltage is less than 0.156 volt for 28 seconds after starting engine. Possible causes are:1/1 HO2S output wire shorted to another circuit, dirty or wet connection causing voltage tracking in connector, defective 1/1 HO2S, defective Powertrain Control Module (PCM), defective connector terminals or connector wires. Go to next step.
2. If engine is warm, turn engine off and allow it to cool for at least 15 minutes. Turn ignition on, engine off. Go to next step.
3. Using scan tool, read 1/1 HO2S voltage. If voltage is less than 0.16 volt, go to step 5). If voltage is 0.16 volt or more, go to next step.
4. Wiggle wiring harness and connector going to 1/1 HO2S while monitoring voltage. If voltage changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-5A. If voltage does not change while wiggling wiring harness, condition required to set DTC is not present at this time. See INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-5A.
5. Turn ignition off. Disconnect 1/1 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
6. Using scan tool, read 1/1 HO2S voltage. If voltage is 0.16 volt or more, replace 1/1 HO2S and perform TEST VER-5A. If voltage is less than 0.16 volt, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between ground and 1/1 HO2S connector, signal circuit. See 1/1 HO2S SIGNAL CIRCUIT IDENTIFICATION table. If resistance is less than 5 ohms, repair short to ground in 1/1 HO2S signal circuit and perform TEST VER-5A. If resistance is 5 ohms or more, go to next step. 1/1 HO2S SIGNAL CIRCUIT IDENTIFICATION Application Wire Color BR Body Tan/White or Black/Dark Green
9. Wiggle wiring harness and connector at 1/1 HO2S while monitoring1/1 HO2S resistance. If resistance changes while wiggling wiring harness, repair wiring harness for short to ground and perform TEST VER-5A. If resistance does not change, replace PCM and perform TEST VER-5A.

TEST TC-156A - 1/2 O2 SENSOR VOLTAGE SHORTED TO GROUND

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position.

1. UPSTREAM O2S VOLTAGE SHORTED TO GROUND DTC sets if PCM senses 1/2 Heated Oxygen Sensor (HO2S) voltage is less than 0.156 volt for 28 seconds after starting engine. Possible causes are:1/2 HO2S output wire shorted to another circuit, dirty or wet connection causing voltage tracking in connector, defective 1/2 HO2S, defective Powertrain Control Module (PCM), defective connector terminals or connector wires. Go to next step.
2. If engine is warm, turn engine off and allow it to cool for at least 15 minutes. Turn ignition on, engine off. Go to next step.
3. Using scan tool, read 1/2 HO2S voltage. If voltage is less than 0.16 volt, go to step 5). If voltage is 0.16 volt or more, go to next step.
4. Wiggle wiring harness and connector going to 1/2 HO2S while monitoring voltage. If voltage changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-5A. If voltage does not change while wiggling wiring harness, condition required to set DTC is not present at this time. See INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-5A.
5. Turn ignition off. Disconnect 1/2 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
6. Using scan tool, read 1/2 HO2S voltage. If voltage is 0.16 volt or more, replace 1/2 HO2S and perform TEST VER-5A. If voltage is less than 0.16 volt, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between ground and 1/2 HO2S connector, signal circuit. See 1/2 HO2S SIGNAL CIRCUIT IDENTIFICATION table. If resistance is less than 5 ohms, repair short to ground in 1/2 HO2S signal circuit and perform TEST VER-5A. If resistance is 5 ohms or more, go to next step. 1/2 HO2S SIGNAL CIRCUIT IDENTIFICATION Application Wire Color BR Body Tan/Red
9. Wiggle wiring harness and connector at 1/2 HO2S while monitoring1/2 HO2S resistance. If resistance changes while wiggling wiring harness, repair wiring harness for short to ground and perform TEST VER-5A. If resistance does not change, replace PCM and perform TEST VER-5A.

TEST TC-157A - INTERMITTENT LOSS OF CMP OR CKP

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. INTERMITTENT LOSS OF CMP OR CKP DTC sets when expected Camshaft Position (CMP) sensor signal level disagrees with actual CMP signal level. Possible causes are: open or shorted 5-volt supply circuit, open sensor ground, open or shorted signal circuit, excessive clearance between Crankshaft Position (CKP) sensor and crankshaft pulse ring, excessive clearance between CKP sensor and target magnet, damaged target magnet, defective sensor or defective PCM. Go to next step.
2. Use scan tool in set sync mode to check distributor position. Set distributor to specification using procedure in TEST NS-8A if necessary and perform TEST VER-2A. If distributor is set to specification, go to next step. NOTE: Refer to manufacturer's operation manual for instructions in use of oscilloscope and procedure for pattern analysis.
3. If not using an oscilloscope for diagnosis, perform TEST TC-157B. If using oscilloscope, with CMP sensor connected, backprobe oscillo scope's voltage lead at CMP sensor connector, CMP signal circuit (Tan/Yellow wire). Start engine. If sensor signal pattern is consistent, go to step 6). If sensor signal pattern is not consistent, go to next step.
4. Turn ignition off. Disconnect CMP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
5. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, perform TEST TC-157C.
6. Backprobe oscilloscope's voltage lead at PCM Black connector, CMP signal circuit (Tan/Yellow wire). Wiggle wiring harness from PCM to CMP sensor while observing oscilloscope pattern. If sensor signal does not remain consistent while wiggling wiring harness, repair wiring harness as necessary where wiggling caused inconsistent pattern and perform TEST VER-2A. If sensor signal is consistent, go to next step.
7. Turn ignition off. With CKP sensor connected, backprobe oscillo-scope's voltage lead at CKP sensor connector, CKP sensor circuit (Gray/Black wire). Start engine. If sensor signal pattern is consistent, go to step 10). If sensor signal pattern is not consistent, go to next step.
8. Turn ignition off. Disconnect CKP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
9. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, perform TEST TC-157D.
10. Using oscilloscope's voltage lead, backprobe at PCM Black connector, CKP signal circuit (Gray/Black wire). Wiggle wiring harness from PCM to CKP sensor while observing oscilloscope pattern. If sensor signal does not remain consistent while wiggling wiring harness, repair wiring harness as necessary where wiggling caused inconsistent pattern and perform TEST VER-2A. If sensor signal is consistent, go to next step.
11. Condition required to set DTC is not present at this time. See INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.

TEST TC-157B - INTERMITTENT LOSS OF CMP OR CKP

Note. Perform TEST TC-157A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Disconnect CMP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
3. Disconnect CKP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
4. Reconnect PCM, CMP and CKP connectors. Start engine and allow it to idle. Go to next step.
5. Using scan tool, read engine speed (RPM) while wiggling CMP and CKP wiring harness. If RPM changes while wiggling wiring harness, repair wiring harness as necessary and perform TEST VER-2A. If RPM does not change, go to next step.
6. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
7. Condition required to set DTC is not present at this time. INTERMITTENT LOSS OF CMP or CKP DTC sets when PCM senses a cam signal level that disagrees with actual cam signal level. Possible causes are: open or shorted 5-volt supply circuit, open sensor ground, open or shorted signal circuit, excessive clearance between crankshaft sensor and crankshaft pulse ring, excessive clearance between crankshaft sensor and target magnet, damaged target magnet, failed sensor or failed PCM. Go to next step.
8. See INACTIVE DTC CONDITIONS. Test is complete. Perform TEST VER-2A.

TEST TC-157C - INTERMITTENT LOSS OF CMP OR CKP

Note. Perform TEST TC-157A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Remove distributor cap. Inspect distributor rotor and drive for looseness. Repair distributor rotor and drive looseness as necessary and perform TEST VER-2A. If distributor rotor and drive are okay, replace CMP sensor and perform TEST VER-2A.

TEST TC-157D- INTERMITTENT LOSS OF CMP OR CKP

Note. Perform TEST TC-157A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Inspect CKP sensor for proper installation. Correct CKP sensor installation if necessary. If CKP sensor is properly installed, go to next step.
2. Remove CKP sensor. Inspect flywheel for damage. Repair flywheel as necessary and perform TEST VER-2A. If flywheel is okay, replace CKP sensor and perform TEST VER-2A.
3. Remove CKP sensor. Inspect crankshaft for damage or misalignment. Repair crankshaft as necessary. If crankshaft is okay, replace CKP sensor and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-157D to TEST TC-160A. No tests have been omitted.

TEST TC-161A - EVAP LEAK MONITOR LARGE LEAK DETECTED

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. DTC may be set by defective secondary seal on fuel filler neck, or a loose or missing fuel tank cap. Ensure fuel tank is at least 1/2 full. Go to next step.
2. Connect a hand-held vacuum pump to Leak Detection Pump (LDP) vacuum tee. Apply 18 in. Hg of vacuum to LDP. If LDP does not hold vacuum, repair LDP vacuum supply line and repeat this test to verify repair. If LDP holds vacuum, go to next step.
3. Turn ignition on. Using scan tool, actuate LDP. If LDP vacuum does not drop during actuation, replace LDP and repeat this test to verify repair. If LDP vacuum drops, go to next step.
4. Using Evaporative (EVAP) System Testing Kit (6872A) and instructions printed on its cover, perform pressure pump self-test. Go to next step.
5. Connect EVAP system pressure pump supply hose to Leak Detection Pump (LDP) test port. Set pressure hold to OPEN. Disconnect purge solenoid connector and set vent to CLOSED. Go to next step.
6. While monitoring vacuum gauge, turn pump timer on. If LDP vacuum decreases more than 8 in. H2O in 2 minutes, go to step 9). If vacuum does not decrease more than 8 in. H2O in 2 minutes, go to next step.
7. Condition required to set DTC is not present at this time. EVAP SYSTEM GROSS LEAK DTC sets if a leak larger than .080" exists in EVAP system. Possible causes are: defective LDP or a leak larger than .080" in EVAP system. Go to next step.
8. Inspect all related hoses, wiring and connectors for damage. Repair hoses, wiring and connectors as necessary and perform TEST VER-5A. If hoses, wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-5A.
9. Set pressure hold to OPEN and set vent to CLOSED. Turn pump timer on. Move EVAP system testing kit away from vehicle to prevent operating noise from interfering with test procedures. Turn pump timer off and go to next step.
10. Using Ultrasonic Leak Detector (300), check for leaks at fuel tank cap, fuel tank rollover valve, charcoal canister, LDP, and EVAP purge solenoid. Repair or replace leaking component as necessary and perform TEST VER-5A. If no leaks exist, replace LDP and perform TEST VER-5A.

TEST TC-162A - NO TEMP RISE SEEN FROM INTAKE AIR HEATERS

Note. This test applies to BR body equipped with diesel engine only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using an external voltmeter, check and record voltage on intake air heater No. 1 connector, intake air heater relay No. 1 relay output circuit (Black wire). (Scheme 45) Go to next step.
2. Using scan tool, briefly actuate intake air heater relay No. 1 while checking voltage on intake air heater No. 1 connector, intake air heater relay No. 1 relay output circuit. If voltage drops more than 0.5 volt during actuation, intake air heater is operating properly. Test passed. If voltage does not drop more than 0.5 volt and intake heater relay clicks during actuation, perform TEST VER-162B. If intake heater relay does not click, go to next step.
3. Check and record voltage on intake air heater No. 2 connector, intake air heater relay No. 2 relay output circuit (Black wire). Go to next step.
4. Using scan tool, briefly actuate intake air heater relay No. 2 while checking voltage on intake air heater No. 2 connector, intake air heater relay No. 2 relay output circuit. If voltage drops more than 0.5 volt during actuation, intake air heater is operating properly. Test passed. If voltage does not drop more than 0.5 volt and intake heater relay clicks during actuation, perform TEST VER-162B. If intake heater relay does not click, go to next step.
5. Disconnect intake air heater relay No. 1 connector, fused ignition switch output circuit (Light Green/Black wire). Inspect connector and terminal for damage. Repair connector and terminal as necessary and perform TEST VER-2A. If connector and terminal are okay, go to next step.
6. Using scan tool in voltmeter mode, check voltage on intake air heater relay No. 1 connector, fused ignition switch output circuit. If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
7. Disconnect intake air heater relay No. 2 connector, fused ignition switch output circuit (Light Green/Black wire). Inspect connector and terminal for damage. Repair connector and terminal as necessary and perform TEST VER-2A. If connector and terminal are okay, go to next step.
8. Using scan tool in voltmeter mode, check voltage on intake air heater relay No. 2 connector, fused ignition switch output circuit. If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
9. Reconnect intake air heater relay connectors, fused ignition switch output circuits. Disconnect intake air heater relay No. 1 connector, control circuit (Yellow/Black wire). Inspect connector and terminal for damage. Repair connector and terminal as necessary and perform TEST VER-2A. If connector and terminal are okay, go to next step.
10. Connect a jumper wire to open heater relay No. 1 connector terminal. Briefly tap other end of jumper wire to ground. If intake air heater relay No. 1 does not click, replace relay and perform TEST VER-2A. If relay clicks, go to next step.
11. Disconnect intake air heater relay No. 2 connector, control circuit (Orange/Black wire). Inspect connector and terminal for damage. Repair connector and terminal as necessary and perform TEST VER-2A. If connector and terminal are okay, go to next step.
12. Connect a jumper wire to open heater relay No. 2 connector terminal. Briefly tap other end of jumper wire to ground. If intake air heater relay No. 2 does not click, replace relay and perform TEST VER-2A. If relay clicks, go to next step.
13. Turn ignition off. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
14. Using an external ohmmeter, check resistance of intake air heater No. 1 control circuit (Yellow/Black wire) between PCM Black connector and intake air heater No. 1 relay. If resistance is 5 ohms or more, repair open control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
15. Check resistance of intake air heater No. 2 control circuit (Orange/Black wire) between PCM Black connector and intake air heater No. 2 relay. If resistance is 5 ohms or more, repair open control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
16. Check resistance between ground and PCM Black connector, intake air heater No. 1 control circuit (Yellow/Black wire). If resistance is less than 5 ohms, repair short to ground in control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
17. Check resistance of intake air heater No. 2 control circuit (Orange/Black wire) between PCM Black connector and intake air heater No. 2 relay connector. If resistance is more than 5 ohms, repair open control circuit and perform TEST VER-2A. If resistance is 5 ohms or less, replace PCM and perform TEST VER-2A.

Testing Intake Air Heater Relays. Scheme 45

TEST TC-162B - NO TEMP RISE SEEN FROM INTAKE AIR HEATERS

Note. This test applies to BR body equipped with diesel engine only. Perform TEST TC-162A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using an external voltmeter, check voltage on intake air heater No. 1 positive battery cable. (Scheme 45) If voltage is 10 volts or less, repair open positive battery cable between relay and battery. Perform test VER-2A. If voltage is more than 10 volts, go to next step.
2. Check voltage on intake air heater No. 2 positive battery cable. If voltage is 10 volts or less, repair open positive battery cable between relay and battery. Perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
3. Using scan tool, briefly actuate intake air heater relay No. 1 while checking voltage on intake air heater No. 1 connector, intake air heater relay No. 1 relay output circuit (Light Green/Black wire). If voltage is 9 volts or less during actuation, repair open output circuit and perform TEST VER-2A. If voltage is more than 9 volts, go to next step.
4. Using scan tool, briefly actuate intake air heater relay No. 2 while checking voltage on intake air heater No. 2 connector, intake air heater relay No. 2 relay output circuit (Light Green/Black wire). If voltage is 9 volts or less during actuation, repair open output circuit and perform TEST VER-2A. If voltage is more than 9 volts, replace intake air heater element and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-162B to TEST TC-164A. No tests have been omitted.

TEST TC-164A - TRANS TEMP SENSOR NO RISE AFTER START

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. To test Transmission Temperature (TRANS TEMP) sensor, engine and TRANS TEMP must be less than 85°F (29.4°C).

1. Using scan tool, read DTCs. If P/N SWITCH, TRANS TEMP SENSOR VOLTAGE TOO LOW or TRANS TEMP SENSOR VOLTAGE TOO HIGH DTC is present, repair these DTCs before proceeding. If neither of these DTCs are present, go to next step.
2. Using scan tool, read and record Engine Coolant Temperature (ECT) sensor temperature, and TRANS TEMP sensor temperature. If TRANS TEMP is within 9 degrees of ECT temperature, go to step 5). If TRANS TEMP is not within 9 degrees of ECT temperature, go to next step.
3. Start engine and let it idle in gear, with brake on. Monitor TRANS TEMP sensor. If TRANS TEMP does not increase steadily 15°F over a 10 minute period, go to step 5). If TRANS TEMP increases steadily 15°F over a 10 minute period, TRANS TEMP sensor is functioning properly at this time. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-1A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Disconnect TRANS solenoid 8-pin connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, replace TRANS TEMP/governor pressure sensor and perform TEST VER-2A.

TEST TC-165A - 3-4 SHIFT SOLENOID NO RPM DROP 3-4 SHIFT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read DTCs. If any DTC listed in 3-4 SHIFT SOLENOID TESTS table is present, perform appropriate test(s). If no DTCs are present, go to next step. 3-4 SHIFT SOLENOID TESTS DTC Message Test NO CAM SIGNAL AT PCM TC-1A PNP SWITCH STUCK IN PARK OR IN GEAR TC-114A TPS VOLTAGE TOO LOW TC-26A TPS VOLTAGE TOO HIGH TC-27A TORQUE CONVERTOR CLUTCH SOLENOID TC-12A TPS VOLTAGE DOES NOT AGREE WITH MAP TC-132A TRANS 12-VOLT SUPPLY RELAY CNTRL CIRCUIT TC-173A 3-4 SHIFT SOLENOID/TRANS RELAY CIRCUIT TC-50A
2. Check transmission fluid for proper level and for any debris. Fill or repair transmission as necessary and perform TEST VER-2A. If fluid level and condition are okay, go to next step.
3. Connect a 0-300 psi pressure gauge to transmission Overdrive (O/D) clutch test port. (Scheme 46) Connect a second 0-300 psi pressure gauge to transmission governor test port. (Scheme 44) Go to next step.
4. With an assistant, test drive vehicle. Ensure engine and transmission are at operating temperature. Using scan tool, select GOV 3-4 system test. Select 4th gear while monitoring pressure gauge. Go to next step.
5. Governor pressure should rise to more than 20 psi and O/D pressure should rise to more than 40 psi. If pressures are as specified, go to step 8). If pressures are not as specified, go to next step.
6. Leave gauges connected. Replace 3-4 shift solenoid. Start engine and allow engine and transmission to reach operating temperature. Go to next step.
7. Using scan tool, select GOV 3-4 system test. Select 4th gear while monitoring pressure gauge. Governor pressure should rise to more than 20 psi and O/D pressure should rise to more than 40 psi. If pressures are as specified, no problem is found at this time. Test is complete, Perform TEST VER-2A. If pressures are not as specified, overhaul transmission paying attention to seals and clutches related to O/D clutch.
8. Turn engine off. Drain and remove transmission oil pan. Inspect pan for burnt oil and debris. Repair transmission as necessary and perform TEST VER-2A. If transmission is okay, no problem is found at this time. Test is complete. Perform TEST VER-2A.

Identifying Overdrive Clutch Test Port. Scheme 46

TEST TC-166A - LOW OUTPUT SPEED SENSOR RPM ABOVE 15 MPH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read DTCs. If P/N SWITCH STUCK IN PARK OR IN GEAR DTC is present, repair this DTC before proceeding. If DTC is not present, go to next step. WARNING: Keep hands and feet clear of rotating wheels.
2. Raise and support vehicle so drive wheels are free to rotate. Start engine. Using scan tool, read Output Speed Sensor (OSS) signal. Place transmission in any forward gear. If scan tool displays 60 MPH or less, go to step 7). If scan tool displays more than 60 MPH, go to next step.
3. While monitoring OSS signal, wiggle connectors and wiring harness from OSS to Powertrain Control Module (PCM). If reading drops toward zero MPH while wiggling connectors and harness, repair connector or harness that caused drop and perform TEST VER-2A. If reading does not change, go to next step.
4. Using scan tool, erase DTCs. Road test vehicle. Using scan tool, read DTCs. If LOW OUTPUT SPEED SENSOR DTC does not return, go to step 6). If DTC returns, go to next step.
5. Replace OSS. Using scan tool, erase DTCs. Road test vehicle. Using scan tool, read DTCs. If LOW OUTPUT SPEED SENSOR DTC does not return, go to next step. If DTC returns, replace PCM and perform TEST VER-1A.
6. Condition required to set DTC is not present at this time. LOW OUTPUT SPEED SENSOR RPM DTC sets if no OSS signal (23 pulses per output shaft revolution) is received at PCM. Possible causes are: defective OSS, defective connections, no pulses, defective wiring, or defective PCM. Test is complete.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-1A. If connectors and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between ground and PCM White connector, OSS signal circuit (Light Green/Black wire on BR body; Light Green/White wire on all other bodies). If resistance is less than 5 ohms, repair OSS signal circuit for short to ground and perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
9. Check resistance between ground and PCM White connector, ground circuit (Dark Green/Black wire). If resistance is 5 ohms or less, repair ground circuit for short to ground and perform TEST VER-1A. If resistance is more than 5 ohms, go to next step.
10. Check resistance between PCM White connector, OSS signal circuit (Light Green/Black wire on BR body; Light Green/White wire on all other bodies) and ground circuit (Dark Green/Black wire). If resistance is 300-1200 ohms, replace PCM and perform TEST VER-1A. If resistance is not as specified, go to next step.
11. Disconnect OSS connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
12. Check resistance across OSS connector. If resistance is not 300-1200 ohms, replace OSS and perform TEST VER-1A. If resistance is as specified, go to next step.
13. Check resistance of OSS signal circuit (Light Green/Black wire on BR body; Light Green/White wire on all other bodies) between PCM white connector and OSS connector. If resistance is more than 5 ohms, repair open OSS signal circuit and perform TEST VER-1A. If resistance is 5 ohms or less, repair open OSS ground circuit and perform TEST VER-2A.

TEST TC-167A - GOVERNOR PRESSURE SENSOR VOLTS TOO LOW

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Turn ignition on, Using scan tool, check voltage on transmission solenoid connector, 5-volt supply circuit (Orange wire). If voltage is not 4.5-5.5 volts, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is as specified, go to next step.
3. Connect transmission solenoid connector. Using scan tool, read governor pressure sensor voltage. If voltage is more than 4.65 volts, perform TEST TC-168A. If voltage is less than 0.12 volt, go to step 7). If voltage is not 0.12-0.80 volt, perform TEST TC-168B. If voltage is 0.12-4.65 volts, go to next step.
4. Wiggle wiring harness from PCM to governor pressure sensor while monitoring GOV PRESSURE voltage. If voltage changes while wiggling wiring harness, repair wiring where wiggling caused change and perform TEST VER-2A. If voltage does not change, go next step.
5. Condition required to set DTC is not present at this time. GOVERNOR PRESSURE SENSOR VOLTS TOO LOW DTC sets if governor pressure sensor input is less than 0.1 volt for 8.36 seconds. Possible causes are: defective PCM, internally shorted or open, incorrectly wired, dirty or corroded connector, or open or shorted wiring. Go to next step.
6. Test is complete. See INACTIVE DTC CONDITION. Perform TEST VER-2A.
7. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Turn ignition off. Disconnect PCM connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
9. Using an external ohmmeter, check resistance between PCM Black connector, sensor ground circuit (Black/Light Blue wire) and PCM White connector, governor pressure sensor signal circuit (Light Green/White wire). If resistance is less than 5 ohms, repair governor pressure sensor signal circuit for short to ground circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
10. Check resistance between ground and PCM White connector, governor pressure sensor signal circuit (Light Green/White wire). If resistance is less than 5 ohms, repair governor pressure sensor signal circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
11. Remove transmission oil pan. Disconnect governor pressure sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
12. Connect transmission solenoid connector. Check resistance between governor pressure sensor connector, governor pressure signal circuit (Light Green/White wire) and ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, replace transmission solenoid and harness assembly. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
13. Check resistance between ground and governor pressure sensor connector, governor pressure signal circuit (Light Green/White wire). If resistance is less than 5 ohms, replace transmission solenoid and harness assembly. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
14. Reconnect all connectors except governor pressure sensor connector. Turn ignition on. Using scan tool, read governor pressure sensor voltage. If voltage is 4.8 volts or less, replace PCM and perform TEST VER-2A. If voltage is more than 4.8 volts, replace governor pressure sensor and perform TEST VER-2A.

TEST TC-168A - GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Turn ignition on, Using scan tool, check voltage on transmission solenoid connector, 5-volt supply circuit (Orange wire). If voltage is not 4.5-5.5 volts, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is as specified, go to next step.
3. Connect transmission solenoid connector. Using scan tool, read governor pressure sensor voltage. If voltage is more than 4.65 volts, go to step 7). If voltage is less than 0.12 volt, perform TEST VER-167A. If voltage is not 0.12-0.80 volts, perform TEST TC-168B. If voltage is 0.12-4.65 volts, go to next step.
4. Wiggle wiring harness from PCM to governor pressure sensor while monitoring GOV PRESSURE voltage. If voltage changes while wiggling wiring harness, repair wiring where wiggling caused change and perform TEST VER-2A. If voltage does not change, go next step.
5. Condition required to set DTC is not present at this time. GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH DTC sets if governor pressure sensor input is more than 4.89 volts for 8.36 seconds. Possible causes are: defective PCM, internally shorted or open, incorrectly wired, dirty or corroded connector, or open or shorted wiring. Go to next step.
6. Test is complete. See INACTIVE DTC CONDITION. Perform TEST VER-2A.
7. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Turn ignition off. Disconnect PCM connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
9. Using an external ohmmeter, check resistance of governor pressure sensor signal circuit (Light Green/White wire) between transmission solenoid connector and PCM White connector. If resistance is more than 5 ohms, repair open governor pressure sensor signal circuit and perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
10. Check resistance of sensor ground circuit (Black/Light Blue wire) between PCM Black connector and transmission solenoid connector. If resistance is more than 5 ohms, repair open ground circuit and perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
11. Connect a jumper wire between transmission relay connector, fused B+ circuit (Red/White wire) and transmission control relay output circuit (Red wire). Go to next step.
12. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM White connector, governor pressure signal circuit (Light Green/White wire). If voltage is more than 10 volts, repair governor pressure signal circuit for short to voltage and perform TEST VER-2A. If voltage is 10 volts or less, go to next step.
13. Remove transmission oil pan. Disconnect governor pressure sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
14. Connect transmission solenoid connector. Check voltage on governor pressure sensor connector, governor pressure signal circuit (Light Green/White wire). If voltage is more than one volt, replace transmission solenoid and harness assembly. Perform TEST VER-2A. If voltage is one volt or less, go to next step.
15. Turn ignition off. Using an external ohmmeter, check resistance of governor pressure sensor signal circuit (Light Green/White wire) between PCM White connector and governor pressure sensor connector. If resistance is more than 5 ohms, replace transmission solenoid and harness assembly. Perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
16. Check resistance of sensor ground circuit (Green wire) between PCM Black connector and governor pressure sensor connector. If resistance is more than 5 ohms, replace transmission solenoid and harness assembly. Perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
17. Reconnect all connectors except governor pressure sensor connector. Carefully connect a jumper wire between governor pressure sensor connector, governor pressure signal circuit (Light Green/White wire) and ground circuit (Green wire). Go to next step.
18. Turn ignition on. Using scan tool, read governor pressure sensor voltage. If voltage is one volt or less, replace governor pressure sensor and perform TEST VER-2A. If resistance is more than one volt, replace PCM and perform TEST VER-2A.

TEST TC-168B - GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH

Note. Perform TEST TC-168A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect PCM White connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Start engine. Using scan tool, read governor pressure sensor voltage. If voltage is 4.65 volts or less, replace PCM and perform TEST VER-2A. If resistance is more than 4.65 volts, go to next step.
3. Turn ignition off. Disconnect remaining PCM connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
4. Disconnect transmission solenoid connector. Using an external ohmmeter, check resistance of governor pressure sensor signal circuit (Light Green/White wire) between transmission solenoid connector and PCM White connector. If resistance is more than 5 ohms, repair open governor pressure sensor signal circuit and perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
5. Check resistance of ground circuit (Black/Light Blue wire) between transmission solenoid connector and PCM Black connector. If resistance is more than 5 ohms, repair open ground circuit and perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
6. Turn ignition on. Using scan tool, check voltage on governor pressure sensor signal circuit (Light Green/White wire). If voltage is more than one volt, repair governor pressure signal circuit for short to voltage and perform TEST VER-2A. If voltage is one volt or less, go to next step.
7. Remove transmission oil pan. Disconnect governor pressure sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
8. Connect transmission solenoid connector. Check voltage on governor pressure sensor connector, governor pressure signal circuit (Light Green/White wire). If voltage is more than one volt, replace transmission solenoid and harness assembly. Perform TEST VER-2A. If voltage is one volt or less, go to next step.
9. Turn ignition off. Using an external ohmmeter, check resistance of governor pressure sensor signal circuit (Light Green/White wire) between PCM White connector and governor pressure sensor connector. If resistance is more than 5 ohms, replace transmission solenoid and harness assembly. Perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
10. Check resistance of sensor ground circuit (Green wire) between PCM Black connector and governor pressure sensor connector. If resistance is more than 5 ohms, replace transmission solenoid and harness assembly. Perform TEST VER-2A. If resistance is 5 ohms or less, replace governor pressure sensor and perform TEST VER-2A.

TEST TC-169A - GOV PRESS SEN OFFSET VOLTS TOO LOW OR TOO HIGH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Start engine and allow it to reach operating temperature. Check transmission fluid level and condition. Correct transmission fluid level or condition as necessary and perform TEST VER-2A. If transmission fluid level and condition are okay, go to next step.
2. Check Park Neutral Position (PNP) switch operation. Repair PNP switch as necessary and perform TEST VER-2A. If PNP switch operation is okay, go to next step.
3. Put gear selector in Neutral. Using scan tool, read GOV PRESSURE voltage. If voltage is not 0.30-0.76 volt, go to step 6). If voltage is as specified, go to next step.
4. While monitoring GOV PRESSURE sensor voltage, wiggle connectors and wiring harness from governor pressure sensor to Powertrain Control Module (PCM). If voltage changes while wiggling connectors and harness, repair connector or harness that caused voltage change and perform TEST VER-2A. If voltage does not change, go to next step.
5. Condition required to set DTC is not present at this time. GOV PRESS SENS VOLTS TOO LOW or TOO HIGH DTC sets if governor pressure sensor input is less than or more than a predetermined PNP switch calibration for 1.32 seconds under predetermined conditions. Possible causes are: defective governor pressure sensor, shorted or open 5-volt supply circuit, or defective powertrain control module. Test is complete. Perform TEST VER-2A.
6. Turn ignition off. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
7. Turn ignition on. Using scan tool in voltmeter mode, check voltage on transmission solenoid connector, 5-volt supply circuit (Orange wire). If voltage is less than 4.5 volts, repair open 5-volt supply circuit and perform TEST VER-2A. If voltage is 4.5 volts or more, go to next step.
8. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
9. Using an external ohmmeter, check resistance of ground circuit (Black/Light Blue wire) between transmission solenoid connector and PCM Black connector. If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
10. Connect all connectors. While still monitoring GOV PRESSURE sensor voltage, wiggle connectors and wiring harness from governor pressure sensor to PCM. If voltage changes while wiggling connectors and harness, repair connector or harness that caused voltage change and perform TEST VER-2A. If voltage does not change, go to next step.
11. Using scan tool, erase DTCs. Start engine and allow it to idle in Neutral or Park for 3 minutes. Read DTCs. If GOV PRESS SENS VOLTS TOO LOW or TOO HIGH DTC does not reset, return to step 5). If DTC resets, go to next step.
12. Replace governor pressure sensor and perform TEST VER-2A. Drain and remove transmission pan. Inspect pan for burnt oil and debris. Repair transmission as necessary and perform TEST VER-2A. If transmission is okay, no problem is found at this time. Test is complete. Perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-169A to TEST TC-171A. No tests have been omitted.

TEST TC-171A - GOVERNOR PRESSURE SOLENOID/TRANS RELAY CKTS

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read DTCs. If 12-VOLT RELAY CONTROL CIRCUIT DTC is also set, perform TEST TC-173A. If 12-VOLT RELAY CONTROL CIRCUIT DTC is not set, go to next step.
2. Using scan tool, perform GOV and 3-4 shift test. Select 1st gear and read governor pressure voltage. If voltage is one volt or more, go to step 6). If voltage is less than one volt, go to next step.
3. Condition required to set DTC is not present at this time. GOVERNOR PRESSURE SOLENOID CIRCUIT DTC sets if current state of solenoid output is different from expected output for 4.48 seconds. Possible causes are: defective transmission control relay, incorrectly wired connector, open or shorted wiring, dirty or corroded connector, defective connector terminals, or defective PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
5. Using scan tool, erase DTCs. Start engine. Using scan tool, read DTCs while wiggling wiring harness from governor pressure solenoid to PCM and note if GOVERNOR PRESSURE SOLENOID CIRCUIT DTC resets. If DTC resets, repair wiring harness as necessary and perform TEST VER-2A. If DTC does not reset, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
6. Turn ignition off. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
7. Turn ignition on. Using scan tool, actuate transmission control relay. Using scan tool in voltmeter mode, check voltage on transmission solenoid connector, transmission relay output circuit (Red wire). If voltage does not switch from zero to more than 10 volts, perform TEST TC-171B. If voltage switches from zero to more than 10 volts, go to next step.
8. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
9. Turn ignition on. Check voltage on transmission solenoid connector, governor pressure solenoid control circuit (Violet/White wire). If voltage is more than 10 volts, perform TEST TC-171D. If voltage is 10 volts or less, go to next step.
10. Reconnect transmission solenoid connector. Turn ignition off. Using an external ohmmeter, check resistance between ground and PCM White connector, governor pressure solenoid control circuit (Violet/White wire). If resistance is 5 ohms or less, repair short to ground in governor pressure solenoid control circuit and perform TEST VER-2A. If resistance is more than 5 ohms, go to next step.
11. Remove transmission control relay. Inspect transmission control relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
12. Using external ohmmeter, connect one lead to transmission control relay connector, transmission control relay output circuit (Red wire). Go to next step.
13. Connect other lead to PCM White connector, governor pressure solenoid control circuit (Violet/White wire). If resistance is 2.5-5.0 ohms, replace PCM and perform TEST VER-2A. If resistance is 5 ohms or less, perform TEST TC-171C. If resistance is more than 5 ohms, go to next step.
14. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
15. Check resistance of governor pressure solenoid control circuit (Violet/White wire) between PCM White connector and transmission solenoid connector. If resistance is more than 5 ohms, repair open governor pressure solenoid control and perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
16. Drain and remove transmission pan. Disconnect governor pressure solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
17. Check resistance across governor pressure solenoid terminals. If resistance is 5 ohms or less, replace transmission solenoid and harness assembly. Perform TEST VER-2A. If resistance is more than 5 ohms, replace governor pressure solenoid and perform TEST VER-2A.

TEST TC-171B - GOVERNOR PRESSURE SOLENOID/TRANS RELAY CKTS

Note. Perform TEST TC-171A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Remove transmission control relay. Inspect transmission control relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Turn ignition off. Using an external ohmmeter, check resistance between ground and transmission control relay connector, transmission control relay output circuit (Red wire). If resistance is less than 5 ohms, repair short to ground in transmission control relay output circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
3. Check resistance of transmission control relay output circuit (Red wire) between transmission solenoid connector and transmission relay connector. If resistance is more than 5 ohms, repair open transmission control relay circuit and perform TEST VER-2A. If resistance is 5 ohms or less, go to next step.
4. Turn ignition on. Using scan tool, check voltage on transmission control relay connector, fused B+ circuit (Red/White wire). If voltage is 10 volts or less, repair open fused B+ circuit and perform TEST VER-2A. If voltage is more than 10 volts, replace transmission control relay and perform TEST VER-2A.

TEST TC-171C - GOVERNOR PRESSURE SOLENOID/TRANS RELAY CKTS

Note. Perform TEST TC-171A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect transmission solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check and record resistance between transmission solenoid connector, governor pressure solenoid control circuit (Violet/White wire) and all other circuits in solenoid connector. If resistance is less than 2.5 ohms between any 2 circuits, repair governor pressure solenoid control circuit for a short to other circuit(s), perform TEST VER-2A and go to step 4). If resistance is 2.5 ohms or more between all circuits, go to next step.
3. Drain and remove transmission pan. Disconnect governor pressure solenoid connector. Check resistance across governor pressure solenoid. If resistance is less than 2.5 ohms, replace governor pressure solenoid, perform TEST VER-2A and go to next step. If resistance is 2.5 ohms or more, replace transmission solenoid and harness assembly, perform TEST VER-2A and go to next step.
4. Using scan tool, perform GOV and 3-4 shift test. Select 1st gear and read governor pressure voltage. If voltage is one volt or more, replace PCM and perform TEST VER-2A. If voltage is less than one volt, test is complete.

TEST TC-171D - GOVERNOR PRESSURE SOLENOID CIRCUIT

Note. Perform TEST TC-171A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Repair governor pressure solenoid control circuit for short to voltage. Perform TEST VER-2A. Connect all disconnected connectors and go to next step.
2. Using scan tool, perform GOV and 3-4 shift test. Select 1st gear and read governor pressure voltage. If voltage is one volt or more, replace PCM and perform TEST VER-2A. If voltage is less than one volt, test is complete.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-171D to TEST TC-173A. No tests have been omitted.

TEST TC-173A - TRANS 12-VOLT SUPPLY RELAY CNTRL CIRCUIT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, actuate transmission control relay. If transmission control relay does not click, go to step 5). If transmission control relay clicks, go to next step.
2. Condition required to set DTC is not present at this time. TRANS 12-VOLT SUPPLY RELAY CNTRL CIRCUIT DTC sets if transmission control relay is not in a state requested by Powertrain Control Module (PCM) for more than 3 seconds. Possible causes are: defective relay, open or shorted control circuit, defective PCM, or defective connector terminals. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
4. Wiggle wiring harness from transmission control relay to PCM. Ensure scan tool is still actuating transmission control relay. If transmission control relay stops clicking, repair wiring harness as necessary and perform TEST VER-2A. If transmission control relay continues clicking, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Remove transmission control relay. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using scan tool in voltmeter mode, check voltage on transmission control relay connector, Generator (GEN) source circuit. See GENERATOR SOURCE CIRCUIT IDENTIFICATION table. If voltage is 10 volts or less, repair open GEN source circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step. GENERATOR SOURCE CIRCUIT IDENTIFICATION Application Wire Color BR Body White/Dark Blue
7. Using an external ohmmeter, check resistance between transmission control relay terminals No. 85 and 86. (Scheme 41) If resistance is 100 ohms or more, replace transmission control relay and perform TEST VER-2A. If resistance is less than 100 ohms, go to next step.
8. Turn ignition off. Disconnect Powertrain Control Module (PCM) White connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
9. Using an external ohmmeter, check resistance between ground and PCM White connector, transmission relay control circuit. See TRANSMISSION RELAY CONTROL CIRCUIT IDENTIFICATION table. If resistance is less than 5 ohms, repair short to ground in transmission relay control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step. TRANSMISSION RELAY CONTROL CIRCUIT IDENTIFICATION Application Wire Color BR Body Pink
10. Check resistance of transmission relay control circuit between transmission control relay connector and PCM White connector. See TRANSMISSION RELAY CONTROL CIRCUIT IDENTIFICATION table. If resistance is 5 ohms or more, repair open transmission relay control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-173A to TEST TC-181A. No tests have been omitted.

TEST TC-181A - 2/1 O2 SENSOR VOLTAGE SHORTED TO GROUND

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 2/1 Heated Oxygen Sensor (HO2S) is located in right upstream position on models with 2 upstream HO2S.

1. UPSTREAM O2S VOLTAGE SHORTED TO GROUND DTC sets if PCM senses HO2S voltage is less than 0.156 volt for 28 seconds after starting engine. Possible causes are: HO2S output circuit shorted to another circuit, dirty or wet connection causing voltage tracking in connector, defective HO2S, defective Powertrain Control Module (PCM), defective connector terminals or connector wires. Go to next step.
2. If engine is warm, turn engine off and allow it to cool for at least 15 minutes. Turn ignition on, engine off. Go to next step.
3. Using scan tool, read 2/1 HO2S voltage. If voltage is less than 0.16 volt, go to step 5). If voltage is 0.16 volt or more, go to next step.
4. Wiggle wiring harness from 2/1 HO2S to PCM while monitoring voltage. If voltage changes when performing wiggle test, repair wiring harness and connector as necessary and perform TEST VER-5A. If voltage does not change, condition required to set DTC is not present at this time. See INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-5A.
5. Disconnect 2/1 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
6. Using scan tool, read 2/1 HO2S voltage. If voltage is 0.16 volt or more, replace 2/1 HO2S and perform TEST VER-5A. If voltage is less than 0.16 volt, go to next step.
7. Turn ignition off. Disconnect PCM connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A. If connectors and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between 2/1 HO2S signal circuit (Black/Dark Green wire) between 2/1 HO2S connector and PCM Black connector. If resistance is less than 5 ohms, repair short to ground in 2/1 HO2S signal circuit and perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
9. Wiggle wiring harness from 2/1 HO2S to PCM while monitoring resistance. If resistance changes when performing wiggle test, repair wiring harness for short to ground and perform TEST VER-5A. If resistance does not change, replace PCM and perform TEST VER-5A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-181A to TEST TC-183A. No tests have been omitted.

TEST TC-184A - LEAK DETECTION PUMP SW OR MECHANICAL FAULT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Start engine and allow it to idle. Using scan tool, select LDP system test. Press 1 TO PUMP. Using scan tool, read and note Leak Detection Pump (LDP) pressure switch status. If status does not switch from UP to DOWN, go to step 5). If status switches from UP to DOWN, go to next step.
2. Condition required to set DTC is not present at this time. LEAK DETECTION PUMP PRESSURE SW DTC sets if Powertrain Control Module (PCM) does not sense state of solenoid change when it is energized. Possible causes are: open or shorted LDP switch sense circuit, defective LDP switch, or open fused ignition switch circuit. Go to next step.
3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-5A. If wiring and connectors are okay, go to next step.
4. Using scan tool, actuate LDP solenoid. Wiggle wiring harness from LDP solenoid to PCM while monitoring LDP switch status. If status switches from UP to DOWN at any time while wiggling wiring harness, repair wiring harness as necessary and perform TEST VER-5A. If status does not change, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-5A.
5. Disconnect engine vacuum supply hose at LDP. Connect a vacuum gauge between LDP and LDP vacuum supply hose. Start engine and read vacuum gauge. If vacuum gauge does not read within one in. Hg of engine vacuum, repair leak or obstruction in vacuum supply hose and perform TEST VER-5A. If vacuum gauge reads within one in. Hg of engine vacuum, go to next step.
6. Turn engine off. Disconnect LDP connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on LDP connector, fused ignition switch output circuit (Orange wire). If voltage is 10 volts or less, repair open fused ignition switch circuit and perform TEST VER-5A. If voltage is more than 10 volts, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A. If connectors and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance of LDP pressure switch sense circuit (Violet/Red wire) from LDP connector to PCM Gray connector. If resistance is 5 ohms or more, repair open LDP pressure switch sense circuit and perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
9. Check resistance between ground and LDP pressure switch sense circuit (Violet/Red wire). If resistance is less than 5 ohms, repair LDP pressure switch sense circuit for short to ground and perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
10. Reconnect LDP connector. Using scan tool in voltmeter mode, check voltage on LDP connector, LDP pressure switch sense circuit (Violet/Red wire). Turn ignition on. Using hand-held vacuum pump, apply vac-bum to LDP pump while monitoring voltage. If voltage does not change when vacuum is applied, replace LDP and perform TEST VER-5A. If voltage changes, replace PCM and perform TEST VER-5A.

Note. A break in test sequence occurs at this point. Sequence skips from TEST TC-184A to TEST TC-186A. No tests have been omitted.

TEST TC-186A - MISFIRE ADAPTIVE NUMERATOR AT LIMIT

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Disconnect Crankshaft Position (CKP) sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
2. Check installation of CKP sensor. Properly install CKP sensor and perform TEST VER-5A. If CKP sensor is properly installed, go to next step.
3. Inspect flywheel for damage or misalignment. Repair flywheel as necessary and perform TEST VER-5A. If flywheel is okay, replace CKP senor and perform TEST VER-5A.
4. Inspect crankshaft notches for damage or misalignment. Repair crankshaft as necessary and perform TEST VER-5A. If crankshaft is okay, replace CKP sensor and perform TEST VER-5A.
5. Remove crankshaft position sensor. Inspect flexplate slots for damage or excessive movement. Repair flexplate as necessary and perform TEST VER-5A. If flexplate is okay, replace CKP sensor and perform TEST VER-5A.

TEST TC-188A - O/D SWITCH PRESSED (LO) MORE THAN 5 MINUTES

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance between ground and PCM Gray connector, Overdrive (O/D) off switch sense circuit (Orange/White wire). If resistance is less than 5 ohms, go to step 5). If resistance is 5 ohms or more, go to next step.
3. Condition required to set DTC is not present at this time. OVERDRIVE SWITCH LOW RATIONALITY sets if Powertrain Control Module (PCM) senses O/D off switch input is held low for 5 minutes or from time of closure or ignition on. Possible causes are: defective O/D switch, shorted wire or defective PCM.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
5. Disconnect O/D switch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using an external ohmmeter, check resistance between ground and O/D switch connector, O/D off switch sense circuit (Orange/White wire). If resistance is less than 5 ohms, repair short to ground in O/D switch sense circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace O/D off switch and perform TEST VER-2A.

TEST TC-192A - 1/1 O2 SENSOR SLOW DURING CATALYST MONITOR

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/1 HO2S is located in upstream position. On models with 2 upstream HO2S, 1/1 HO2S is located in left upstream position.

1. 1/1 O2 SENSOR SLOW DURING CATALYST MONITOR DTC sets if1/1 Heated Oxygen Sensor (HO2S) voltage is switches from less than 0.39 volt to more than 0.60 volt fewer times than required. Possible causes are: exhaust leak, fuel contamination, HO2S heater failure, defective O2S, defective wiring or connectors, or engine mechanical problems. Go to next step.
2. Start engine. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary and perform TEST VER-5A. If exhaust system is okay, go to next step.
3. Check exhaust for excessive smoke caused by oil or coolant consumption. Repair engine mechanical condition as necessary, replace catalytic converter and HO2Ss, and perform TEST VER-5A. If engine mechanical condition is okay, go to next step.
4. Turn ignition off. Disconnect 1/1 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and 1/1 HO2S connector, ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, repair open sensor ground circuit and perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
6. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A. If connectors and terminals are okay, replace 1/1 HO2S and perform TEST VER-5A.

TEST NTC-1A - NO TROUBLE CODE TEST MENU

Note. This test applies to non-diesel engines only. For tests on diesel engines, see TEST NTC-1B.

No Trouble Code Complete Test

Check Technical Service Bulletins (TSBs) for any pertinent information. If a TSB exists, perform corrective action. If TSB does not exist or if driveability problem still exists, perform tests NTC-2A through NTC-12A, NTC-14A through NTC-16A and TEST NTC-22A in sequence until driveability problem is found. See NO TROUBLE CODE TEST MENU table.

NO TROUBLE CODE TEST MENU

No Trouble Code Quick Individual Test

If any item listed in NO TROUBLE CODE TEST MENU table is suspected as cause of a vehicle's driveability problem, perform associated test(s) individually. Return to NO TROUBLE CODE TEST MENU table if driveability problem still exists, or perform NO TROUBLE CODE COMPLETE TEST.

No Trouble Code Quick Symptom Test

Symptom checks cannot be used properly unless driveability problem characteristic actually happens while vehicle is being tested. To reduce diagnostic time, ensure that DTC TEST is reviewed before attempting to diagnose a symptom.

Select symptom that most accurately describes vehicle's driveability problem and then perform test that pertains to this symptom. Perform each test in sequence until problem is found. See NO TROUBLE CODE QUICK SYMPTOM TEST MENU table.

NO TROUBLE CODE QUICK SYMPTOM TEST MENU

TEST NTC-1B - NO TROUBLE CODE TEST MENU

Note. This test applies to diesel engines only.

Check Technical Service Bulletins (TSBs) for any pertinent information. If a TSB exists, perform corrective action. If TSB does not exist or if driveability problem still exists, perform TEST NTC-1A, NTC-17A through NTC-21B and NTC-22B, in sequence, until driveability problem is found. See NO TROUBLE CODE TEST MENU (DIESEL) table.

NO TROUBLE CODE TEST MENU (DIESEL)

If any item listed in NO TROUBLE CODE TEST MENU (DIESEL) table is suspected as cause of a vehicle's driveability problem, perform associated test(s) individually. Return to NO TROUBLE CODE TEST MENU (DIESEL) table if driveability problem still exists, or perform NO TROUBLE CODE COMPLETE TEST.

TEST NTC-2A - CHECKING SECONDARY IGNITION & TIMING

Note. Refer to manufacturer's operation manual for instructions in use of engine analyzer and procedure for pattern analysis.

1. Turn engine off. Connect an engine analyzer to engine. Start engine, and let it idle. If engine will not idle, maintain constant engine speed at more than idle. Set scope to read display or parade pattern. If secondary ignition pattern is not okay, repair indicated component in secondary ignition system and perform TEST VER-2A. If secondary ignition pattern is okay, go to next step.
2. Remove any spark plug wire. Observe secondary kilovolt line. If open circuit secondary voltage is not at least 25,000 volts, replace ignition coil and perform TEST VER-2A. If open circuit secondary voltage is at least 25,000 volts, go to next step.
3. Reinstall spark plug wire. Ensure engine temperature is more than 180°F (82.2°C) before proceeding. Go to next step.
4. Using scan tool, read total timing advance. Increase engine speed to 2000 RPM. If timing advance does not change with increase in RPM, replace PCM and perform TEST VER-2A. If timing advance changes with increase in RPM, secondary ignition system and timing advance are normal. Test passed.

TEST NTC-3A - CHECKING FUEL PRESSURE (GASOLINE)

1. Turn ignition off. Release fuel pressure. Connect fuel pressure gauge to fuel rail. Turn ignition on. Go to next step.
2. Using scan tool, actuate fuel system test. If fuel pressure is 44.2-54.2 psi (3.1-3.8 kg/cm 2 ), fuel pressure is normal. Stop fuel actuation test. Test passed. If fuel pressure is not as specified, record fuel pressure reading and go to next step.
3. Stop fuel actuation test. Release fuel pressure. Replace fuel pump module and perform TEST VER-2A.
4. If fuel pressure is more than 54.2 psi (3.8 kg/cm 2 ), go to step 6). If fuel pressure is 54.2 psi (3.8 kg/cm 2 ) or less, go to next step.
5. Using scan tool, stop actuation test. Turn ignition off. Inspect fuel lines for kinks or restrictions. Release fuel pressure and repair fuel lines as necessary, and perform TEST VER-2A. If no kinked or restricted lines exist, go to next step.
6. Start engine and note fuel pressure gauge reading. If fuel pressure is 44.2-54.2 psi (3.1-3.8 kg/cm 2 ) fuel pressure is normal. Test passed. If fuel pressure is not as specified, go to next step.
7. If fuel pressure is more than 54.2 psi (3.8 kg/cm 2 ), fuel pump is okay, but internal fuel regulator is defective. Replace fuel pump module and perform TEST VER-2A. If fuel pressure is more than zero, but less than 44.2 psi (3.1 kg/cm 2 ), replace fuel pump module and perform TEST VER-2A. If fuel pressure is zero, perform TEST TC-101A.

TEST NTC-4A - CHECKING ECT SENSOR CALIBRATION

1. Turn ignition on. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If ECT sensor value is more than 180°F (82.2°C), allow engine to cool to 150°F (65.6°C) and go to next step.
2. Start engine. Allow engine to reach 180°F (82.2°C) or more while monitoring scan tool. If scan tool reading does not increase smoothly as engine temperature increases, inspect cooling system for mechanical failures. Repair cooling system as necessary and perform TESTVER-2A. If cooling system is okay, replace ECT sensor and perform TEST VER-2A. If scan tool reading increases smoothly, go to next step.
3. If ECT sensor value did not reach 180°F (82.2°C) or more, inspect cooling system for mechanical failures. Repair cooling system as necessary and perform TEST VER-2A. If cooling system is okay, replace ECT sensor and perform TEST VER-2A. If ECT sensor value reached 180°F (82.2°C), ECT sensor is operating properly. Test is complete.

TEST NTC-5A - CHECKING THROTTLE POSITION SENSOR CALIBRATION

1. Turn ignition on. Using scan tool, read Throttle Position (TP) sensor voltage. Ensure throttle is fully closed and against throttle stop. With throttle closed, replace TP sensor and perform TEST VER-2A. If voltage is not as specified, go to next step.
2. Observe scan tool while slowly opening throttle to wide open position. If voltage change is not smooth, replace TP sensor and perform TEST VER-2A. If voltage change is smooth, go to next step.
3. With throttle at closed position, wiggle wiring harness and connector going to TP sensor on throttle body while monitoring voltage. If voltage changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
4. Start engine. Wiggle wiring harness and connector going to TP sensor on throttle body while monitoring engine speed (RPM). If RPM changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-2A. If RPM does not change while wiggling wiring harness, go to next step.
5. Inspect all related wiring and connections. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, TP sensor is operating properly. Test is complete.

TEST NTC-6A - CHECKING MAP SENSOR CALIBRATION

1. Turn engine off. Install vacuum tee in MAP sensor vacuum hose. Install vacuum gauge. Start engine, and let it idle. If engine will not idle, maintain a constant RPM above idle. Go to next step.
2. Using scan tool, read MAP sensor vacuum. If reading is not within one in. Hg of vacuum gauge reading, replace MAP sensor and perform TEST VER-2A. If reading is within one in. Hg of vacuum gauge reading, MAP sensor is operating properly. Test is complete.

TEST NTC-7A - CHECKING OXYGEN SENSOR SWITCHING

Note. 1/2 and 1/3 Heated Oxygen Sensor (HO2S) switching should be slower than 1/1 or 2/1 HO2S switching.

Note. 1/1 HO2S is located in upstream position. On models with 2 upstream HO2S, 1/1 HO2S is located in left upstream position. 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position.

1. Allow engine to reach normal operating temperature. Using scan tool, read HO2S voltages. If HO2S states are switching between rich and lean, system is functioning properly. Test is complete. If either HO2S is locked on lean, perform TEST NTC-7B. If neither HO2S is locked on lean, go to next step.
2. Turn engine off. Release fuel pressure. Connect fuel pressure gauge to fuel rail. Turn ignition on. Using scan tool, actuate fuel system test. Allow fuel pressure gauge to stabilize to normal fuel pressure. Stop fuel system actuation test. Go to next step.
3. Monitor fuel pressure gauge for one minute. If fuel pressure gauge reading drops more than 10 psi (0.7 kg/cm 2 ), replace leaking injector(s) as necessary and perform TEST VER-2A. If fuel pressure gauge reading does not drop more than 10 psi (0.7 kg/cm 2 ), go to next step.
4. Inspect air cleaner and inlet ducts for restrictions. Repair air cleaner and inlet ducts as necessary and perform TEST VER-2A. If no restrictions exist, perform TEST NTC-22A.

TEST NTC-7B - CHECKING OXYGEN SENSOR SWITCHING

Note. Perform TEST NTC-7A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Allow engine to idle. Inspect engine for vacuum leaks. Repair vacuum leaks as necessary and perform TEST VER-2A. If no vacuum leaks exist, go to next step.
2. Using scan tool, read HO2S signal voltage. If voltage is 0.1 volt or more on all HO2S, go to step 6). If voltage is less than 0.1 volt on any HO2S, go to next step.
3. Turn ignition off. Disconnect suspected HO2S connector. inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
4. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Using an external ohmmeter, check resistance between ground and HO2S connector, HO2S signal circuit (for appropriate wire color, see HO2S SIGNAL CIRCUIT IDENTIFICATION table). If resistance is less than 5 ohms, repair short to ground in HO2S signal circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace HO2S and perform TEST VER-2A. HO2S SIGNAL CIRCUIT IDENTIFICATION Application Wire Color 1/1 HO2S Tan/White or Black/Dark Green 1/2 HO2S Tan/Red 1/3 HO2S Orange/Black 2/1 HO2S Black/Dark Green
6. Turn engine off, ignition on. Using scan tool, reset adaptive fuel memory. Start engine, and allow it to idle for 3 minutes. Using scan tool, read HO2S state. If HO2S state is switching, repair is complete. Perform TEST VER-2A. If HO2S state is not switching, perform TEST NTC-22A.

TEST NTC-8A - CHECKING OXYGEN SENSOR HEATER

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. 1/1 HO2S is located in upstream position. On models with 2 upstream HO2S, 1/1 HO2S is located in left upstream position. 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position.

1. Turn ignition on. Using scan tool, actuate HO2S heater test. Wait 2 minutes for HO2S voltages to stabilize. Go to next step.
2. Using scan tool, read HO2S signal voltage. If voltage is one volt or more on all HO2S, stop actuation test. Test passed. If voltage is more than one volt on any HO2S, go to next step.
3. Turn ignition off. Disconnect suspected HO2S connector. inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
4. Ensure scan tool is still actuating heater test. Using scan tool in voltmeter mode, check voltage on HO2S connector, ASD relay output circuit (Dark Green/Orange wire). If voltage is 10 volts or less, repair open ASD relay output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
5. Stop actuation test. Using an external ohmmeter, check resistance between ground and HO2S connector, heater ground (Black/White wire). If resistance is 5 ohms or more, repair open heater ground circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace HO2S and perform TEST VER-2A.

TEST NTC-9A - CHECKING IDLE AIR CONTROL MOTOR

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Start engine and allow it to reach normal operating temperature. Using scan tool, set engine speed to 1400 RPM. If engine speed sets at 1300-1500 RPM, return engine to normal idle. Idle speed motor is operating properly. Test passed. If engine speed does not set as specified, use scan tool to return engine to normal idle and go to next step.
2. Inspect engine for vacuum leaks. Repair vacuum leaks as necessary and perform TEST VER-2A. If no vacuum leaks exist, go to next step.
3. Turn engine off. Disconnect Idle Air Control (IAC) motor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
4. Using an external ohmmeter, check resistance between ground and IAC motor connector, driver No. 1 circuit (Violet/Black wire). If resistance is less than 5 ohms, repair driver circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
5. Check resistance between ground and IAC motor connector, driver No. 2 circuit (Brown/White wire). If resistance is less than 5 ohms, repair driver circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or, go to next step.
6. Check resistance between ground and IAC motor connector, driver No. 3 circuit (Yellow/Black wire). If resistance is less than 5 ohms, repair driver circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
7. Check resistance between ground and IAC motor connector, driver No. 4 circuit (Gray/Red wire). If resistance is less than 5 ohms, repair driver circuit for short to ground and perform TEST VER-2A. If resistance is 5 ohms or more go to next step. NOTE: Voltage may switch or remain constant in following tests.
8. Turn ignition on. Using scan tool, select actuator tests. Select stepper motor. Go to next step.
9. Using scan tool in voltmeter mode, check voltage on IAC motor connector, driver No. 1 circuit ( Violet/Black wire). If voltage is more than 10 volts at any time, perform TEST NTC-25B. If voltage is not more than 10 volts at any time, go to next step.
10. Check voltage on IAC motor connector, driver No. 2 circuit (Brown/White wire). If voltage is more than 10 volts at any time, perform TEST NTC-25C. If voltage is not more than 10 volts at any time, go to next step.
11. Check voltage on IAC motor connector, driver No. 3 circuit (Yellow/Black wire). If voltage is more than 10 volts at any time, perform TEST NTC-25D. If voltage is not more than 10 volts at any time, go to next step.
12. Check voltage on IAC motor connector, driver No. 4 circuit (Gray/Red wire). If voltage is more than 10 volts at any time, perform TEST NTC-25E. If voltage is not more than 10 volts at any time, Perform TEST TC-9B.

TEST NTC-9B - CHECKING IDLE AIR CONTROL MOTOR

Note. Perform TEST NTC-9A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step. NOTE: Steps 2)-5) check for short circuits between IAC motor driver circuits.
2. Using an external ohmmeter, check resistance between IAC motor connector, driver No. 1 circuit (Gray/Red wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-2A. If resistance is 5 ohms or more on all IAC motor driver circuits, go to next step.
3. Check resistance between IAC motor connector, driver No. 2 circuit (Yellow/Black wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-2A. If resistance is 5 ohms or more on all IAC motor driver circuits, go to next step.
4. Check resistance between IAC motor connector, driver No. 3 circuit (Brown/White wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-2A. If resistance is 5 ohms or more on all IAC motor driver circuits, go to next step.
5. Check resistance between IAC motor connector, driver No. 4 circuit (Violet/Black wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-2A. If resistance is 5 ohms or more, replace IAC motor and perform TEST VER-2A.

TEST NTC-10A - CHECKING PARK/NEUTRAL POSITION SWITCH

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, read Park/Neutral Position (PNP) switch state. Move gear selector in and out of Park and Reverse while observing scan tool display. If display corresponds with gear selector position, system is functioning correctly. Test passed. If display does not correspond with gear selector position, go to next step.
2. Turn ignition off. Place gear selector in Park. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
3. Using an external ohmmeter, check resistance between ground and PCM Black connector, PNP sense circuit (Black/White wire). Observe scan tool display while moving gear selector in and out of Park and Reverse. If resistance switches from less than 10 ohms to more than 10 ohms, replace PCM and perform TEST VER-2A. If resistance does not switch as specified, go to next step.
4. Check if resistance always stays less than 10 ohms. if resistance always stays less than 10 ohms, repair short to ground in PNP switch sense circuit and perform TEST VER-2A. if resistance does not always stay less than 10 ohms, go to next step.
5. Disconnect PNP switch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using an external ohmmeter, check resistance of PNP switch sense circuit (Black/White wire), between PCM Black connector and PNP switch connector. If resistance is less than 5 ohms, replace PNP switch and perform TEST VER-2A. If resistance is 5 ohms or more, repair open PNP switch sense circuit and perform TESTVER-2A.

TEST NTC-11A - CHECKING PCM POWER & GROUND CIRCUITS

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Using scan tool in ohmmeter mode, check resistance of PCM Black connector terminal No. 31, ground circuit (Black/Tan wire). If resistance is 5 ohms or more, repair open ground circuit and perform TESTVER-2A. If resistance is less than 5 ohms, go to next step.
3. Using scan tool in ohmmeter mode, check resistance of PCM Black connector terminal No. 32, ground circuit (Black/Tan wire). If resistance is 5 ohms or more, repair open ground circuit and perform TESTVER-2A. If resistance is less than 5 ohms, go to next step.
4. Using scan tool in voltmeter mode, check voltage on of PCM Black connector, fused B+ circuit (Red/White wire). If voltage is 10 volts or less, repair open B+ circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
5. Turn ignition on. Check voltage on PCM Black connector, ignition switch output circuit. See IGNITION SWITCH OUTPUT CIRCUIT IDENTIFICATION table. If voltage is 10 volts or less, repair open ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step. IGNITION SWITCH OUTPUT CIRCUIT IDENTIFICATION Application Wire Color BR Bodies Light Green/Black
6. Turn ignition off. Reconnect PCM connector. PCM ground and power circuits are operating properly. Test passed.

TEST NTC-12A - CHECKING EVAP SYSTEM

Note. For component location, see appropriate THEORY & OPERATION article.

1. Start engine. Allow engine to reach operating temperature. Inspect throttle body-to-EVAP canister vacuum hoses for leaks or restrictions. Repair or replace hoses as necessary and perform TEST VER-2A. If hoses are okay, go to next step.
2. Disconnect EVAP solenoid-to-EVAP canister hose. Using scan tool, select vapors test. Select No. 3. If EVAP solenoid does not allow vacuum to cycle through, replace EVAP solenoid and perform TEST VER-2A. If EVAP solenoid allows vacuum to cycle through, go to next step.
3. Using scan tool, select No. 2. If EVAP solenoid allows vacuum to cycle through, replace EVAP solenoid and perform TEST VER-2A. If EVAP solenoid does not allow vacuum to cycle through, go to next step. CAUTION: DO NOT use more than 5 psi in following steps.
4. Turn ignition off. Attempt to blow air through EVAP solenoid-to-canister hose. If air flows, EVAP solenoid and hoses are okay. Test passed. If air does not flow, go to next step.
5. Disconnect EVAP solenoid-to-EVAP canister hose at EVAP canister. Attempt to blow air through EVAP solenoid-to-EVAP canister hose. If air flows, replace EVAP canister and perform TEST VER-2A. If air does not flow, repair or replace hose as necessary and perform TEST VER-2A.

TEST NTC-13A - CHECKING EGR SYSTEM

Note. This test applies to vehicles equipped with diesel engine only. For component location, see THEORY & OPERATION article.

1. Turn ignition off. Inspect condition and routing of all EGR hoses. See underhood Emission Label. Repair or replace hoses as necessary and perform TEST VER-2A. If hoses are okay, go to next step.
2. Start engine and allow it to idle. Using scan tool, select EGR system test. Select No. 2. Monitor Intake Air Temperature (IAT) until it stabilizes. Go to next step.
3. Using scan tool, actuate EGR solenoid and allow EGR to flow. Monitor IAT. If IAT does not rise after EGR solenoid is actuated, go to step 5).If IAT rises, go to next step.
4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
5. Disconnect vacuum supply hose at EGR solenoid. If vacuum is not present at EGR solenoid, repair vacuum supply to EGR as necessary and perform TEST VER-2A. If vacuum is present, go to next step.
6. Reconnect vacuum supply hose to EGR solenoid. Disconnect EGR valve-to-EGR solenoid vacuum hose at EGR solenoid. If EGR solenoid does not allow vacuum to flow, replace EGR solenoid and perform TEST VER-2A. If EGR solenoid allows vacuum to flow, go to next step.
7. Reconnect vacuum hose to EGR solenoid. Disconnect EGR valve-to-EGR solenoid vacuum hose at EGR valve. If vacuum is not flowing through hose, repair vacuum or check valve as needed and perform TEST VER-2A. If vacuum is flowing, go to next step.
8. Turn ignition off. Stop EGR system test. Remove EGR valve. Connect hand vacuum pump to EGR valve. Slowly apply 10 in. Hg to EGR valve while watching EGR valve poppet. If EGR valve poppet does not start to open at 10 in. Hg, replace EGR valve assembly and perform TESTVER-2A. If poppet begins to open at 10 in. Hg, ensure no carbon buildup exists in EGR tube or in intake and exhaust manifolds and retest EGR system.

TEST NTC-14A - CHECKING ENGINE VACUUM

Note. Normal vacuum reading will vary depending on altitude.

Connect a vacuum gauge to engine vacuum source. Start engine, and let it idle. Observe vacuum gauge at idle. If vacuum gauge reading is not steady 13-22 in. Hg, perform TEST NTC-22A. If vacuum gauge reading is steady and within specification, engine vacuum is normal. Test passed.

TEST NTC-15A - CHECKING INTAKE AIR TEMPERATURE SENSOR

Note. Ensure engine is off and ignition is on. Perform following steps within 5 minutes of each other.

1. Using scan tool, read and record Intake Air Temperature (IAT) sensor reading. Turn ignition off. Remove IAT sensor. Go to next step.
2. Using temperature probe, measure temperature inside IAT sensor opening. If temperature probe reading is not within 10°F of scan tool reading, replace IAT sensor and perform TEST VER-2A. If temperature probe reading is within 10°F of scan tool reading, reinstall IAT sensor. IAT system is operating properly. Test passed.

TEST NTC-16A - CHECKING MINIMUM IDLE AIRFLOW

1. Remove air cleaner. Disconnect vacuum hose from PCV valve. Install Vacuum Fitting (6714) in disconnected hose. Disconnect 3/16" EVAP hose from throttle side of body. Cap 3/16" nipple. Go to next step.
2. Start engine. Allow engine to reach normal operating temperature. Using scan tool, actuate minimum idle airflow and wait for system to stabilize. If engine speed is 500-900 RPM, stop actuation test. Minimum idle airflow is normal. Test passed. If engine speed is not as specified, go to next step. WARNING: Clean throttle body in well ventilated area and wear rubber gloves.
3. Stop actuation test. Turn engine off. Remove throttle body. While holding throttle open, spray entire throttle body bore with carburetor/throttle body cleaner. Using soft scuff pad, clean throttle body bore and throttle plate. Using compressed air, dry throttle body. Install throttle body and go to next step.
4. Start engine. Using scan tool, actuate minimum idle airflow. If engine speed is 500-900 RPM, stop actuation test. Minimum idle airflow is normal. Test passed. Perform TEST VER-2A. If engine speed is not as specified, replace throttle body and perform TEST VER-2A.

TEST NTC-17A - CHECKING INTAKE AIR HEATER #1

Note. This test applies to vehicles equipped with diesel engines only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool in voltmeter mode, check and record voltage on positive battery terminal. Using scan tool, momentarily actuate intake air heater No. 1 while monitoring voltage. If voltage drops at least 0.5 volt when heater actuates, system is operating properly. Test passed. If voltage does not drop at least 0.5 volt, go to next step.
2. Listen for clicking sound from intake air heater relay No. 1 when heater actuates. If relay is clicking, perform TEST NTC-17B. If relay is not clicking, go to next step.
3. Disconnect fused ignition switch output circuit (Light Green/Black wire) at intake air heater relay No. 1. (Scheme 45) Using scan tool in voltmeter mode, check voltage on fused ignition switch output circuit. If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
4. Reconnect fused ignition switch output circuit. Disconnect intake air heater No. 1 control circuit (Yellow/Black wire) from intake air heater relay No. 1. Connect one end of a jumper wire to driver terminal (where Yellow/Black wire was connected) and briefly tap other end of jumper wire to engine ground. If intake air heater relay No. 1 does not click, replace relay and perform TEST VER-2A. If intake air relay No. 1 clicks, go to next step.
5. Turn ignition off. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using an external ohmmeter, check resistance of intake air heater relay No. 1 control circuit (Yellow/Black wire) between relay connector and PCM Black connector. If resistance is 5 ohms or more, repair open intake air heater relay No. 1 control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
7. Check resistance between ground and PCM Black connector, intake air heater relay No. 1 control circuit (Yellow/Black wire). If resistance is less than 5 ohms, repair short to ground in intake air heater relay No. 1 control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.

TEST NTC-17B - CHECKING INTAKE AIR HEATER #1

Note. For appropriate wiring diagram, see WIRING DIAGRAMS article.

1. Using scan tool in voltmeter mode, check voltage on positive battery cable (Black 6-gauge wire) at intake air heater relay No. 1. (Scheme 45) If voltage is 10 volts or less, repair open cable and perform TEST VER-2A. If voltage is more than 10 volts, go to next step. CAUTION: Intake air heaters draw a large amount of current. Ensure actuation time is brief.
2. Using scan tool in voltmeter mode, check voltage on positive battery cable (Black 6-gauge wire) at intake air heater relay No. 1. Using scan tool, momentarily actuate intake air heater relay No. 1 while monitoring voltage. If voltage is 9 volts or less, repair open positive battery cable and perform TEST VER-2A. If voltage is more than 9 volts, replace intake air heater and perform TEST VER-2A.

TEST NTC-18A - CHECKING INTAKE AIR HEATER #2

Note. This test applies to diesel engines only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool in voltmeter mode, check and record voltage on positive battery terminal. Using scan tool, momentarily actuate intake air heater No. 2 while monitoring voltage. If voltage drops at least 0.5 volt when heater actuates, system is operating properly. Test passed. If voltage does not drop at least 0.5 volt, go to next step.
2. Listen for clicking sound from intake air heater relay No. 2 when heater actuates. If relay is clicking, perform TEST NTC-18B. If relay is not clicking, go to next step.
3. Disconnect fused ignition switch output circuit (Light Green/Black wire) at intake air heater relay No. 2. (Scheme 45) Using scan tool in voltmeter mode, check voltage on fused ignition switch output circuit. If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
4. Reconnect fused ignition switch output circuit. Disconnect intake air heater No. 2 control circuit (Orange/Black wire) from intake air heater relay No. 2. Connect one end of a jumper wire to driver terminal (where Orange/Black wire was connected) and briefly tap other end of jumper wire to engine ground. If intake air relay No. 2 does not click, replace relay and perform TEST VER-2A. If intake air relay No. 2 clicks, go to next step.
5. Turn ignition off. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
6. Using an external ohmmeter, check resistance of intake air heater relay No. 2 control circuit (Orange/Black wire) between relay connector and PCM Black connector. If resistance is 5 ohms or more, repair open intake air relay No. 2 control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
7. Check resistance between ground and PCM Black connector, intake air heater relay No. 2 control circuit (Orange/Black wire). If resistance is less than 5 ohms, repair short to ground in intake air heater relay No. 2 control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.

TEST NTC-18B - CHECKING INTAKE AIR HEATER #2

Note. For appropriate wiring diagram, see WIRING DIAGRAMS article.

1. Using scan tool in voltmeter mode, check voltage on positive battery cable (Black 6-gauge wire) at intake air heater relay No. 2. (Scheme 45) If voltage is 10 volts or less, repair open cable and perform TEST VER-2A. If voltage is more than 10 volts, go to next step. CAUTION: Intake air heaters draw a large amount of current. Ensure actuation time is brief.
2. Using scan tool in voltmeter mode, check voltage on positive battery cable (Black 6-gauge wire) at heater relay No. 2. Using scan tool, momentarily actuate intake air heater relay No. 2 while monitoring voltage. If voltage is 9 volts or less, repair open positive battery cable and perform TEST VER-2A. If voltage is more than 9 volts, replace intake air heater and perform TEST VER-2A.

TEST NTC-19A - CHECKING FUEL HEATER

Note. This test applies to vehicles equipped with diesel engines only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. To hear click in next step, it may be necessary to remove and install relay several times.

1. Turn ignition on. While listening for relay to click, remove fuel heater relay. If relay clicks, go to step 5). If relay does not click, go to next step.
2. Inspect fuel heater relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
3. Turn ignition on. Using scan tool in voltmeter mode, check voltage on fuel heater relay connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-1A. If voltage is more than 10 volts, go to next step.
4. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of fuel heater relay connector, ground circuit (Black/Tan wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-1A. If resistance is less than 5 ohms, replace fuel heater relay an perform TEST VER-1A.
5. Turn ignition off. Disconnect fuel heater connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
6. Using scan tool in ohmmeter mode, check resistance of fuel heater connector, ground circuit (Black/Tan wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-1A. If resistance is less than 5 ohms, go to next step.
7. Turn ignition on. Using scan tool in voltmeter mode, check voltage on fuel heater relay connector, fused B+ circuit (Red/Tan wire). If voltage is less than 10 volts, repair open fused B+ circuit and perform TEST VER-1A. If voltage is less than 10 volts, go to next step.
8. Turn ignition off. Using an external ohmmeter, check resistance of fuel heater relay output circuit (Red/Black wire) between fuel heater relay connector and fuel heater connector. If resistance is more than 5 ohms, repair open fuel heater relay output circuit and perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
9. Disconnect fuel heater element connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step. NOTE: Ensure fuel heater element temperature is less than 40°F (4.4°C).
10. Reconnect fuel heater element connector. Using an external ohmmeter, check resistance across fuel heater connector terminals (component side). If resistance is 5 ohms or less, fuel heater is operating normally. Test passed. If resistance is more than 5 ohms, replace fuel heater and perform TEST VER-1A.

TEST NTC-20A - CHECKING WAIT-TO-START LAMP

Note. This test only applies to vehicles experiencing problems with WAIT-TO-START lamp and equipped with diesel engine. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. While observing WAIT-TO-START lamp, turn ignition on. If WAIT-TO-START lamp does not come on, go to step 4). If lamp comes on then turns off, system is operating normally. Test passed. If lamp comes on and stays on, turn ignition off and go to next step.
2. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
3. While observing WAIT-TO-START lamp, turn ignition on. If WAIT-TO-START lamp comes on, repair short to ground in WAIT-TO-START lamp driver circuit (Orange/Black wire) and perform TEST VER-2A. If WAIT-TO-START lamp does not come on, replace PCM and perform TEST VER-2A.
4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
5. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM White connector, WAIT-TO-START lamp driver circuit (Orange/Black wire). If voltage is more than 10 volts, replace PCM and perform TEST VER-2A. If voltage is 10 volts or less, go to next step.
6. Disconnect WAIT-TO-START lamp connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
7. Inspect WAIT-TO-START lamp bulb. If bulb is burned-out, replace bulb and perform TEST VER-2A. If bulb is okay, reinstall bulb and go to next step.
8. Backprobe message center connector, fused ignition switch output circuit (Light Green/Yellow wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
9. Connect a jumper wire between ground and message center connector, WAIT-TO-START lamp driver circuit (Orange/Black wire). If WAIT-TO-START lamp comes on, repair open WAIT-TO-START lamp driver circuit and perform TEST VER-2A. If WAIT-TO-START lamp does not come on, replace message center printed circuit assembly and perform TEST VER-2A.

TEST NTC-21A - CHECKING WATER-IN-FUEL LAMP & SENSOR

Note. This test only applies to vehicles experiencing problems with WATER-IN-FUEL lamp and equipped with diesel engine. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Disconnect Water-In-Fuel (WIF) sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
2. Connect a jumper wire between ground and WIF sensor connector, sensor signal circuit (Dark Green/Red wire). Turn ignition off, then on to recycle lamp. If WIF lamp comes on, perform TEST NTC-21B. If WIF lamp does not come on, turn ignition off and go to next step.
3. Turn ignition on. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
4. Using an external ohmmeter, check resistance of WIF sensor signal circuit (Dark Green/Red wire) between WIF sensor connector and PCM Black connector. If resistance is 5 ohms or more, repair open WIF sensor signal circuit and perform TEST VER-2A. If resistance is less than 5 ohms, turn ignition on and go to next step.
5. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM Gray connector, WIF lamp driver circuit (Tan/Orange wire). If voltage is more than 10 volts, replace PCM and perform TEST VER-2A. If voltage is 10 volts or less, go to next step.
6. Disconnect WIF lamp connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
7. Inspect WIF lamp bulb. If bulb is burned-out, replace bulb and perform TEST VER-2A. If bulb is okay, reinstall bulb and go to next step.
8. Using scan tool in voltmeter mode, backprobe message center connector, fused ignition switch output circuit (Light Green/Yellow wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
9. Connect a jumper wire between ground and PCM Gray connector, WIF lamp driver circuit (Tan/Orange wire). If WIF lamp does not come on, repair open WIF lamp driver circuit and perform TEST VER-2A. If WIF lamp comes on, replace message center printed circuit assembly and perform TEST VER-2A.

TEST NTC-21B - CHECKING WATER-IN-FUEL - LAMP & SENSOR

Note. Perform TEST NTC-21A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Turn ignition off. Disconnect jumper wire. Using scan tool in ohmmeter mode, check resistance of WIF sensor connector, ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open ground circuit and perform TEST VER-2A. If resistance is 5 ohms or less, replace WIF sensor and perform TEST VER-2A.

TEST NTC-22A - CHECKING ENGINE MECHANICAL SYSTEMS (GASOLINE ENGINES)

Note. This test applies to gasoline engines only. For testing on diesel engines, perform TEST NTC-22B.

Note. If coming to this test from an oxygen sensor test, and rich or lean condition is not corrected after checking items listed below, replace Powertrain Control Module (PCM) and perform TEST VER-2A.

At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a driveability problem. Following additional items should be checked as possible causes

1. Check distributor position. See CHECKING DISTRIBUTOR POSITION WITH SCAN TOOL.
2. Ensure engine vacuum is at least 13 in. Hg in Neutral.
3. Check valve timing.
4. Check engine compression.
5. Check for exhaust system restrictions.
6. Check PCV system for proper function.
7. Ensure engine drive sprocket is properly positioned.
8. Check torque converter stall speed.
9. Check power brake booster for internal vacuum leak.
10. Check for fuel contamination.
11. Ensure injector control wire is connected to correct fuel injector and injector is not plugged or restricted.

Note. Setting distributor position does not adjust ignition timing. Ignition timing is controlled by PCM.

Checking Distributor Position With Scan Tool

1. Connect scan tool to data link connector. Select SET SYNC from scan tool menu. Start engine and go to next step.
2. Observe scan tool display. If scan tool does not display IN RANGE, loosen distributor hold-down clamp bolt and rotate distributor until reading is as close to zero degrees as possible, and IN RANGE message is displayed. Tighten hold-down clamp bolt to 16.7 ft. lbs. (22.5 N.m).

TEST NTC-22B - CHECKING ENGINE MECHANICAL SYSTEMS (DIESEL ENGINES)

Note. This test applies to diesel engines only. For testing on gasoline engines, perform TEST NTC-22A.

At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a driveability problem. Following additional items should be checked as possible causes

1. Check fuel injection pump for malfunction, misadjustment or incorrect pump timing.
2. Check for air in fuel system.
3. Check for restricted or damaged injector nozzle.
4. Check for fuel contamination.
5. Check for clogged fuel filter.
6. Check for leaking or damaged fuel lines.
7. Check for empty fuel tank or blocked fuel tank vent.
8. Check for clogged or restricted air filter.
9. Check for blocked or leaking intercooler.
10. Check engine compression.
11. Check for throttle lever not reaching full throttle position.

TEST NS-SEL - NO START SELECTION MENU

1. Attempt to crank engine. If engine will not crank, perform TEST NS-9A. If engine cranks, but does not start and scan tool displays NO RESPONSE, perform TEST NS-6A. If engine starts and scan tool displays NO RESPONSE, perform TEST NS-6B. If engine starts and scan tool does not display NO RESPONSE, go to next step.
2. Turn ignition off. Turn ignition on, but do not crank engine. Using scan tool, read DTCs. If any DTCs are displayed, go to DTC TEST and perform appropriate test(s). If no DTCs are displayed, refer to one of the following: For all gasoline engines with no start problem, perform TEST NS-1A. For diesel engine with no start problem, with ambient temperature at 40°F (4.4°C) or less, perform TEST NS-14A. For diesel engine with no start problem, independent of ambient temperature, perform TEST NS-15A.

TEST NS-1A - QUALIFYING NO START CONDITION

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect spark plug cable at spark plug No. 1. Connect cable terminal to a spark tester. Connect spark tester to engine ground. Go to next step. CAUTION: When checking for spark, consider 1-2 sparks as a no-spark condition.
2. While cranking engine for 10 seconds, observe for spark. On gasoline engines, if a good spark occurs, but engine starts and stalls, perform TEST NS-7A. If a good spark occurs and engine does not start and stall, perform TEST NS-2A. If a good spark does not occur, reconnect spark plug cable and go to next step.
3. Turn ignition off. Disconnect ignition secondary cable from distributor. Connect cable terminal to a spark tester. Connect spark tester to engine ground. Go to next step.
4. While cranking engine for 10 seconds, observe for spark. If a good spark occurs, replace distributor cap, rotor or cables as necessary and perform TEST VER-1A. If a good spark does not occur, go to next step.
5. Turn ignition off. Disconnect other end of ignition secondary cable from ignition coil. Using an external ohmmeter, check resistance between both ends of ignition secondary cable. If resistance is more than 15,000 ohms, replace ignition secondary cable and perform TEST VER-1A. If resistance is 15,000 ohms or less, go to next step.
6. Remove distributor cap and observe distributor rotor while cranking engine. If rotor does not turn, repair distributor drive system as necessary and perform TEST VER-1A. If rotor turns, go to next step.
7. Reinstall distributor cap and ignition secondary cable. Disconnect ignition coil connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TESTVER-1A. If connector and terminals are okay, go to next step.
8. Turn ignition on. Using scan tool, actuate Generator (GEN) field. Using scan tool in voltmeter mode, check voltage on ignition coil connector, Auto Shutdown (ASD) relay output circuit (Dark Green/Orange wire). If voltage is 10 volts or less, repair open ASD relay output circuit and perform TEST VER-1A. If voltage is more than 10 volts, go to next step.
9. Turn ignition off. Using an external ohmmeter, check resistance across ignition coil primary terminals. (Scheme 42) If resistance is not 0.60-1.40 ohms, replace ignition coil and perform TEST VER-1A. If resistance is as specified, go to next step.
10. Check resistance across ignition coil primary and secondary terminals. (Scheme 42) If resistance is not 11,300-15,300 ohms, replace ignition coil and perform TEST VER-1A. If resistance is as specified, go to next step.
11. Disconnect PCM Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
12. Using an external ohmmeter mode, check resistance between ground and PCM Black connector, ignition coil driver circuit (Black/Gray wire). If resistance is less than 5 ohms, repair short to ground in ignition coil driver circuit and perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
13. Using an external ohmmeter, check resistance of ignition coil driver circuit (Black/Gray wire) between PCM Black connector and ignition coil connector. If resistance is more than 5 ohms, repair open ignition coil driver circuit and perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
14. Check valve timing. Correct valve timing as necessary and perform TEST VER-1A. If valve timing is okay, replace PCM and perform TEST VER-1A.

TEST NS-2A - CHECKING FUEL SYSTEM (GASOLINE)

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Ensure throttle cable is not holding throttle open. Repair throttle cable as necessary and perform TEST VER-1A. If throttle is okay, go to next step.
2. Models equipped with Vehicle Theft Security System (VTSS), go to next step.
3. Using scan tool, actuate fuel system. Using a stethoscope, listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, perform TEST NS-5A. If fuel pump operation can be heard, go to next step. WARNING: Fuel system may be under pressure. Release fuel pressure before connecting fuel pressure gauge. See FUEL PRESSURE RELEASE.
4. Turn ignition off. Release fuel pressure. Ensure fuel tank is at least1/4 full. Connect a fuel pressure gauge to fuel rail. Go to next step.
5. Turn ignition on. Using scan tool, actuate fuel system. Read fuel pressure gauge. If fuel pressure is more than 54.2 psi (3.8 kg/cm 2 ), replace fuel filter/regulator and primary fuel filter, and perform TEST VER-1A. If fuel pressure is less than 44.2 psi (3.1 kg/cm 2 ), perform TEST NS-4A. If fuel pressure is 44.2-54.2 psi (3.1-3.8 kg/cm 2 ) and vehicle initially started and stalled repeatedly, perform TEST NS-7A. If vehicle did not initially start and stall repeatedly, go to next step.
6. Using scan tool, actuate any fuel injector. Listen or feel for fuel injection operation. If injector is not operating, repair appropriate ASD relay output circuit (Dark Green/Orange wire). Perform TEST VER-1A. If injector is operating properly, perform TEST NS-3A.

TEST NS-3A - CHECKING ENGINE MECHANICAL SYSTEM

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Inspect spark plug cables for correct placement. Reposition cables as necessary and perform TEST VER-1A. If spark plug cables are installed correctly, go to next step.
2. Turn ignition off. Check valve timing. Correct valve timing as necessary and perform TEST VER-1A. If valve timing is okay, go to next step.
3. Check exhaust system for restrictions. Repair exhaust system as necessary and perform TEST VER-1A. If exhaust system is okay, go to next step.
4. Remove Auto Shutdown (ASD) relay. Remove spark plugs. Check engine compression. Repair engine mechanical condition as necessary and perform TEST VER-1A. If engine is okay, replace PCM and perform TEST VER-1A.

TEST NS-4A - REPAIRING LOW FUEL PRESSURE

Inspect fuel lines from fuel filter/regulator to fuel rail for restrictions. Repair restricted fuel lines as necessary and perform TEST VER-1A.If no restrictions exist, replace fuel pump module and perform TESTVER-1A.

TEST NS-5A - CHECKING FUEL PUMP

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Using scan tool, stop fuel system actuation and actuate fuel pump relay. Feel fuel pump relay. If fuel pump relay does not pulsate, perform TEST TC-101A. If fuel pump relay pulsates, go to next step.
2. Turn ignition off. Remove fuel pump relay. Substitute a known-good fuel pump relay and attempt to start engine. If engine starts, replace original fuel pump relay and perform TEST VER-1A. If engine does not start, go to next step.
3. Inspect fuel pump relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
4. Turn ignition on. Using scan tool in voltmeter mode, check voltage on fuel pump relay connector, fused B+ circuit (Red/White wire). If voltage is 10 volts or less, repair open fused B+ circuit and perform TEST VER-1A. If voltage is more than 10 volts, reinstall original relay and go to next step. NOTE: Ensure fuel pump connector has clean and tight connections.
5. Disconnect fuel pump connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
6. Turn ignition on. Using scan tool, actuate fuel system. Using scan tool in voltmeter mode, check voltage on fuel pump connector, fuel pump relay output circuit (Dark Green/Black wire). If voltage is 10 volts or less, repair open fuel pump relay output circuit and perform TEST VER-1A. If voltage is more than 10 volts, go to next step. WARNING: Fuel system may be under pressure. Release fuel pressure before opening system for testing or component replacement. See FUEL PRESSURE RELEASE.
7. Using scan tool, stop fuel system actuation. Using an external ohmmeter, check resistance between ground and fuel pump connector, fuel pump ground circuit (Black wire). If resistance is 5 ohms or more, repair open fuel pump ground circuit and perform TEST VER-1A. If resistance is less than 5 ohms, replace fuel pump and perform TEST VER-1A.

TEST NS-6A - REPAIRING NO RESPONSE CONDITION

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) Black connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
2. Turn ignition off. Using an external ohmmeter, check resistance between ground and both PCM Black connector, ground circuits (Black/Tan wires on all other bodies). If resistance is 5 ohms or more on either ground circuit, repair open ground circuits and perform TEST VER-1A. If resistance is less than 5 ohms on both ground circuits, go to next step.
3. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM Black connector, fused ignition switch output circuit (Green/Black wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-1A. If voltage is more than 10 volts, go to next step.
4. Check voltage on PCM Black connector, fused B+ circuit (Red/White wire). If voltage is more than 10 volts, perform TEST NS-6D. If voltage is 10 volts or less, go to next step.
5. Remove and inspect B+ fuse/fuse link from Power Distribution Center (PDC). If fuse/fuse link is open, do not replace fuse/fuse link and go to step 7). If fuse/fuse link is okay, go to next step.
6. Check voltage on B+ fuse/fuse link connector, battery supply circuit (Red wire), between battery and PDC. If voltage is 10 volts or less, repair open battery supply circuit and perform TEST VER-1A. If voltage is more than 10 volts, repair open fused B+ circuit (Red/White wire) between PDC and PCM, and perform TEST VER-1A.
7. Turn ignition off. Remove Auto Shutdown (ASD) or fuel system relay. Inspect relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEXT VER-1A. If connector and terminals are okay, go to next step.
8. Using an external ohmmeter, check resistance between ground and PCM Black connector, fused B+ circuit (Red/White wire). If resistance is less than 5 ohms, repair short to ground in fused B+ circuit, replace fuse/fuse link and perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
9. Check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more and vehicle is equipped with a gasoline engine, perform TEST NS-6C. If vehicle is equipped with a diesel engine, ASD relay output circuit may be shorting to ground intermittently. Replace fuse/fuse link and perform TEST VER-1A.
10. If vehicle is equipped with diesel engine, go to step 16). On vehicles equipped with gasoline engines, disconnect each Heated Oxygen Sensor (HO2S) connector. Go to next step.
11. Using an external ohmmeter, check resistance between ground and ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, go to step 13).
12. Check resistance between ground and each HO2S connector (component side) terminal No. 1, ASD relay output circuit (White wire). (Scheme 43) Replace HO2S that has continuity to ground. Replace fuse/fuse link and perform TEST VER-1A. NOTE: Oxygen sensors must remain disconnected for remainder of test.
13. Disconnect ignition coil connector. Check resistance between ground and ASD relay connector, ASD relay output circuit (Dark Green/Orange). If resistance is more than 5 ohms, replace ignition coil and fuse/fuse link, and perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
14. Disconnect generator field connector. Check resistance between ground and ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, repair short to ground in generator and perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
15. While monitoring ohmmeter display, disconnect and reconnect each fuel injector connector in sequence. If resistance is more than 5 ohms when any fuel injector is disconnected, replace fuel injector that caused change in resistance, replace fuse/fuse link, and perform TEST VER-1A. If resistance is not more than 5 ohms when any fuel injector is disconnected, repair short to ground in ASD relay output circuit (Dark Green/Orange wire), replace fuse/fuse link, and perform TEST VER-1A.
16. Disconnect generator field connector. Check resistance between ground and ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, repair short to ground in generator and perform TEST VER-1A. If resistance is 5 ohms or less, repair short to ground in ASD relay output circuit, replace fuse, and perform TEST VER-1A.

TEST NS-6B - REPAIRING NO RESPONSE CONDITION

Note. Perform TEST NS-6A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. If ignition is not on when NO RESPONSE message is displayed, turn ignition on to get a response. Test is complete. If ignition is on when NO RESPONSE message is displayed, turn ignition off. Go to next step.
2. Disconnect Powertrain Control Module (PCM) connectors. Disconnect scan tool from Data Link Connector (DLC). Inspect PCM and DLC connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-1A. If connectors and terminals are okay, go to next step.
3. Using an external ohmmeter, check resistance between ground and DLC connector, SCI transmit circuit (Pink wire). If resistance is less than 5 ohms, repair short to ground in SCI transmit circuit and perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
4. Check resistance between ground and DLC connector, SCI receive circuit (Light Green wire). If resistance is less than 5 ohms, repair short to ground in SCI receive circuit and perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
5. Check resistance of SCI transmit circuit (Pink wire) between DLC and PCM Gray connector. If resistance is 5 ohms or more, repair open SCI transmit circuit and perform TEST VER-1A. If resistance is less than 5 ohms, go to next step.
6. Check resistance of SCI receive circuit (Light Green wire) between DLC and PCM Gray connector. If resistance 5 ohms or more, repair open SCI receive circuit and perform TEST VER-1A. If resistance is less than 5 ohms, go to next step.
7. Connect scan tool to functional DLC on another vehicle. Turn ignition on. Using scan tool, attempt to read DTCs. If scan tool does not display NO RESPONSE, replace initial vehicle's PCM and perform TESTVER-1A. If scan tool displays NO RESPONSE, go to next step.
8. Substitute another scan tool adapter cable. Using scan tool, attempt to read DTCs. If scan tool does not display NO RESPONSE, replace original scan tool adapter cable. If scan tool displays NO RESPONSE, repair or replace scan tool.

TEST NS-6C - REPAIRING NO RESPONSE CONDITION

Note. Perform TEST NS-6A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Disconnect fuel pump connector. Using scan tool in ohmmeter mode, check resistance of fuel pump relay connector, fuel pump relay output circuit (Dark Green/Black wire). If resistance is less than 5 ohms, repair short to ground in fuel pump relay output circuit. Replace fuse and perform TEST VER-1A. If resistance is 5 ohms or more, replace fuel pump and fuse, and perform TEST VER-1A.

TEST NS-6D - REPAIRING NO RESPONSE CONDITION

Note. PERFORM TEST NS-6A BEFORE PROCEEDING. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Reconnect all disconnected connectors. Using scan tool in voltmeter mode, backprobe Throttle Position (TP) sensor connector 5-volt supply circuit (Violet/White wire). If voltage is 4 volts or more, go to next step. If voltage is less than 4 volts, go to step 4).
2. Perform TEST NS-6E.
3. Disconnect TP sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TESTVER-1A. If connector and terminals are okay, go to next step.
4. Using scan tool, check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4 volts or more, replace TP sensor and perform TEST VER-1A. If voltage is less than 4 volts, go to next step.
5. On all bodies, disconnect Crankshaft Position (CKP) sensor connector. Check connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
6. Check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4 volts or more, replace CKP sensor and perform TEST VER-1A. If voltage is less than 4 volts, go to next step.
7. If vehicle is equipped with diesel engine, go to step 11). On gasoline engine, disconnect Camshaft Position (CMP) sensor connector. Check connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
8. Check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4 volts or more, replace CMP sensor and perform TEST VER-1A. If voltage is less than 4 volts, go to next step.
9. Disconnect Manifold Absolute Pressure (MAP) sensor connector. Check connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
10. Check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4 volts or more, replace MAP sensor and perform TEST VER-1A. If voltage is less than 4 volts, go to next step.
11. Disconnect Vehicle Speed Sensor (VSS) connector. Check connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
12. Check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4 volts or more, replace VSS sensor and perform TEST VER-1A. If voltage is less than 4 volts, go to next step.
13. Disconnect transmission solenoid connector. Check connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
14. Check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 4 volts or more, replace transmission governor pressure sensor and perform TEST VER-1A. If voltage is less than 4 volts, go to next step.
15. Check voltage on TP sensor connector, ground circuit (Black/Light Blue wire). If voltage is more than one volt, repair ground circuit for a short to voltage and perform TEST VER-1A. If voltage is one volt or less, go to next step.
16. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-1A. If connectors and terminals are okay, go to next step.
17. Using an external ohmmeter, check resistance between ground and PCM Black connector, 5-volt primary supply circuit (Violet/White wire). If resistance is less than 5 ohms, repair short to ground in 5-volt supply primary circuit and perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
18. Using an external ohmmeter, check resistance between ground and PCM White connector, 5-volt secondary supply circuit (Orange wire). If resistance is less than 5 ohms, short to ground in 5-volt supply secondary circuit and perform TEST VER-1A. If resistance is 5 ohms or more, perform TEST NS-6B.

TEST NS-6E - REPAIRING NO RESPONSE CONDITION

Note. This test applies to vehicles equipped with diesel engine only. Perform TEST NS-6A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Disconnect Throttle Position (TP) sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
2. Using scan tool, check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is 5.5 volts or less, replace powertrain control module and perform TEST VER-1A. If voltage is more than 5.5 volts, repair 5-volt supply circuit for short to voltage and perform TEST VER-1A.

TEST NS-7A - CHECKING IDLE AIR CONTROL MOTOR

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Holding throttle 1/4 way down, attempt to start engine. If engine does not start and stay running, and then stall when throttle is released, perform TEST NS-8A. If engine starts and stays running, and then stalls when throttle is released, go to next step.
2. Disconnect Idle Air Control (IAC) motor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
3. Using scan tool, actuate IAC motor. Using scan tool in voltmeter mode, check voltage on IAC motor connector, No. 3 driver circuit (Brown/White wire). If voltage stays less than one volt, perform NS-7B. If voltage stays one volt or more, go to next step.
4. Check voltage on IAC motor connector, No. 1 driver circuit (Gray/Red wire). If voltage stays less than one volt, perform NS-7C. If voltage stays at one volt or more, go to next step.
5. Check voltage on IAC motor connector, No. 4 driver circuit (Violet/Black wire). If voltage stays less than one volt, perform TEST NS-7D on all other bodies. If voltage stays at one volt or more, go to next step.
6. Check voltage on IAC motor connector, No. 2 driver circuit (Yellow/Black wire). If voltage stays less than one volt, perform TEST NS-7E. If voltage stays at one volt or more, go to next step.
7. Turn ignition off. Remove IAC motor from throttle body. Reconnect IAC motor connector. Using scan tool, actuate IAC motor. If IAC motor tip does not move in and out, go to step 9). If IAC motor tip moves in and out, go to next step.
8. Inspect throttle body for restriction or carbon build-up. Repair throttle body as necessary and perform TEST VER-1A. If throttle body is okay, perform TEST NS-8A.
9. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-1A. If connectors and terminals are okay, go to next step.
10. Disconnect IAC motor connector. Using an external ohmmeter, check resistance between IAC motor connector, driver No. 1 circuit (Gray/Red wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-1A. If resistance is 5 ohms or more on all IAC motor driver circuits, go to next step.
11. Check resistance between IAC motor connector, driver No. 2 circuit (Yellow/Black wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-1A. If resistance is 5 ohms or more on all IAC motor driver circuits, go to next step.
12. Check resistance between IAC motor connector, driver No. 3 circuit (Brown/White wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-1A. If resistance is 5 ohms or more on all IAC motor driver circuits, go to next step.
13. Check resistance between IAC motor connector, driver No. 4 circuit (Violet/Black wire) and each remaining circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together and perform TEST VER-1A. If resistance is 5 ohms or more replace IAC motor and perform TEST VER-1A.

TEST NS-7B - IDLE AIR CONTROL MOTOR CIRCUITS

Note. Perform TEST NS-7A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-1A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of IAC motor connector, driver No. 3 circuit (Brown/White wire) between IAC motor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-1A. If resistance is 5 ohms or more, repair open driver No. 3 circuit and perform TEST VER-1A.

TEST NS-7C - IDLE AIR CONTROL MOTOR CIRCUITS

Note. Perform TEST NS-7A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of IAC motor connector, driver No. 1 circuit (Gray/Red wire) between IAC motor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-1A. If resistance is 5 ohms or more, repair open driver No. 1 circuit and perform TEST VER-1A.

TEST NS-7D - IDLE AIR CONTROL MOTOR CIRCUITS

Note. Perform TEST NS-7A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of IAC motor connector, driver No. 4 circuit (Violet/Black wire) between IAC motor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-1A. If resistance is 5 ohms or more, repair open driver No. 4 circuit and perform TEST VER-1A.

TEST NS-7E - IDLE AIR CONTROL MOTOR CIRCUITS

Note. Perform TEST NS-7A before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-1A. If connectors and terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of IAC motor connector, driver No. 2 circuit (Yellow/Black wire) between IAC motor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-1A. If resistance is 5 ohms or more, repair open driver No. 2 circuit and perform TEST VER-1A.

TEST NS-8A - REPAIRING START & STALL CONDITION

At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a start and stall problem. Following additional items should be checked as possible causes

1. Check distributor position. See CHECKING DISTRIBUTOR POSITION WITH SCAN TOOL.
2. Check valve timing.
3. Check engine compression.
4. Check for exhaust system restriction.
5. Check PCV system for proper function.
6. Check drive sprockets.
7. Check for fuel contamination.
8. Check secondary ignition system.
9. Check if any Technical Service Bulletins (TSBs) apply to vehicle.

Note. Setting distributor position does not adjust ignition timing. Ignition timing is controlled by powertrain control module.

1. Connect scan tool to data link connector. Select SET SYNC from scan tool menu. Start engine and go to next step.
2. Observe scan tool display. If scan tool does not display IN RANGE, loosen distributor hold-down clamp bolt and rotate distributor until reading is as close to zero degrees as possible, and IN RANGE message is displayed. Tighten hold-down clamp bolt to 16.7 ft. lbs. (22.5 N.m).

TEST NS-9A - REPAIRING NO CRANK CONDITION

Note. This test applies only to vehicles equipped with Automatic Transmission (A/T). For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. If vehicle is equipped with manual transmission, perform TEST NS-9B. Ensure gear selector is in Park position. Using scan tool, select INPUTS/OUTPUTS and read Park/Neutral Position (PNP) state. If scan tool does not display P/N, P/N switch sense circuit is open. Perform TEST TC-114A. If scan tool displays P/N, go to next step.
2. Remove starter relay. Inspect starter relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
3. Using scan tool in voltmeter mode, check voltage on starter relay connector, fused B+ circuit (Pink/Black wire). If voltage is 10 volts or less, repair open fused B+ circuit and perform TEST VER-1A. If voltage is more than 10 volts, go to next step.
4. While holding ignition key in CRANK position, check voltage on starter relay connector, ignition switch output circuit (Yellow/Red wire). If voltage is 10 volts or less, repair open ignition switch output circuit and perform TEST VER-1A. If voltage is more than 10 volts, perform TEST NS-9C.

TEST NS-9B - REPAIRING NO CRANK CONDITION

Note. This test applies only to vehicles equipped with Manual Transmission (M/T). For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. If vehicle is equipped with automatic transmission, perform TEST NS-9A. Remove starter relay. Inspect starter relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
2. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of starter relay connector, ground circuit (Black/White wire). If resistance is more than 5 ohms, repair open ground circuit and perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
3. Turn ignition on. Using scan tool in voltmeter mode, check voltage on starter relay connector, fused B+ circuit (Pink/Black wire). If voltage is less than 10 volts, repair open fused B+ circuit and perform TESTVER-1A. If voltage is 10 volts or more, go to next step.
4. While holding ignition key in CRANK position, check voltage on starter relay connector, ignition switch output circuit (Yellow/Red wire). If voltage is more than 10 volts, perform TEST NS-9C. If voltage is 10 volts or less, go to next step.
5. Go to next step.
6. Disconnect clutch pedal position switch connector. Connect a jumper wire across clutch pedal position switch connector. While holding ignition key in CRANK position, check voltage on starter relay connector, ignition switch output circuit (Yellow/Red wire). If voltage is more than 10 volts, replace clutch master cylinder and perform TEST VER-1A. If voltage is 10 volts or less, go to next step.
7. Disconnect jumper wire. While holding ignition key in CRANK position, check voltage on clutch pedal position switch connector, ignition switch output circuit (Yellow/Red wire). If voltage is more than 10 volts, repair open ignition switch output circuit between clutch switch and relay. Perform TEST VER-1A. If voltage is 10 volts or less, repair open ignition switch output and perform TEST VER-1A.

TEST NS-9C - REPAIRING NO CRANK CONDITION

Note. Perform TEST NS-9A or NS-9B before proceeding. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Ensure transmission is in Park (A/T) or Neutral (M/T) and parking brake is set. Briefly connect a jumper wire between starter relay connector, fused B+ circuit (Pink/Black wire) and ignition switch output circuit (Yellow/Red wire), go to next step.
2. If starter motor cranks, go to step 7). If starter motor does not crank, note if starter solenoid clicks when jumper wire is connected. Disconnect jumper wire and go to next step.
3. Disconnect starter relay output circuit (Brown wire) from starter solenoid. Inspect connector and terminal for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
4. Using an external ohmmeter, check resistance of starter relay output circuit (Brown wire) between starter relay connector and starter solenoid. If resistance is 5 ohms or more, repair open starter relay output circuit and perform TEST VER-1A. If resistance is less than 5 ohms, go to next step.
5. Reinstall starter relay. Check battery cables for high resistance. If either cable has a voltage drop of more than 0.2 volt, replace battery cable(s) and perform TEST VER-1A. If battery cables are okay, go to next step.
6. If starter solenoid did not click when jumper wire was connected in step 1), replace starter solenoid and perform TEST VER-1A. If starter solenoid clicked, repair mechanical condition preventing starter from cranking and perform TEST VER-1A.
7. If vehicle is equipped with M/T, replace starter relay and perform TEST VER-1A. If vehicle is equipped with A/T, go to next step.
8. Using scan tool in ohmmeter mode, check resistance of starter relay connector, Park/Neutral Position (PNP) switch sense circuit (Black/White wire). If resistance is less than 5 ohms, replace starter relay and perform TEST VER-1A. If resistance is 5 ohms or more, repair open PNP switch sense circuit and perform TEST VER-1A.

TEST NS-14A - CHECKING FUEL HEATER RELAY WITH ENGINE TEMPERATURE LESS THAN 40°F (4.4°C)

Note. This test applies to vehicles equipped with diesel engine only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

1. Turn ignition on. While listening for relay to click, remove and install fuel heater relay several times. If relay clicks, go to step 5). If relay does not click, go to next step.
2. Remove fuel heater relay. Inspect relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
3. Using scan tool in voltmeter mode, check voltage on fuel heater relay connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-1A. If voltage is more than 10 volts, go to next step.
4. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of fuel heater relay connector, ground circuit (Black/Tan wire). If resistance is more than 5 ohms, repair open ground circuit and perform TEST VER-1A. If resistance is 5 ohms or less, replace fuel heater relay and perform TEST VER-1A.
5. Turn ignition off. Disconnect fuel heater connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
6. Using scan tool in ohmmeter mode, check resistance of fuel heater connector, ground circuit (Black/Tan wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-1A. If resistance is less than 5 ohms, go to next step.
7. Using an external ohmmeter, check resistance of fuel heater relay output circuit (Red/Black wire) between fuel heater relay connector and fuel heater connector. If resistance is more than 5 ohms, repair open fuel heater relay output circuit and perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
8. Disconnect fuel heater element connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step. NOTE: Fuel heater temperature must be less than 40°F (4.4°C) in following step.
9. Test resistance across fuel heater connector terminals (component side). If resistance is 5 ohms or less, Perform TEST NTC-17A or NTC-18A. If resistance is more than 5 ohms, replace fuel heater and perform TEST VER-1A.

TEST NS-15A - CHECKING FUEL HEATER RELAY INDEPENDENT OF ENGINE TEMPERATURE

Note. This test applies to vehicles equipped with diesel engine only. For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.

Note. DO NOT turn ignition off after cranking engine in following step.

1. Observe position of fuel shutdown solenoid plunger. Crank engine for 3 seconds. Observe position of plunger. If plunger has retracted, no-start condition is due to a mechanical problem. Perform TEST NTC-22B. If plunger has not retracted, go to next step.
2. Manually retract and release plunger. If plunger remains retracted, go to step 6). If plunger does not remain retracted, go to next step.
3. Disconnect fuel shutdown solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
4. Turn ignition on. Using scan tool in voltmeter mode, check voltage on fuel shutdown solenoid connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-1A. If voltage is more than 10 volts, go to next step.
5. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of fuel shutdown solenoid connector, ground circuit (Black/Tan wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-1A. If resistance is less than 5 ohms, replace fuel shutdown solenoid and perform TEST VER-1A.
6. Disconnect fuel shutdown solenoid connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
7. Using scan tool in voltmeter mode, check voltage on fuel shutdown solenoid connector, relay output circuit (Red/Violet wire) while cranking engine. If voltage is 10 volts or less, go to step 9). If voltage is more than 10 volts, go to next step.
8. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of fuel shutdown solenoid connector, ground circuit (Black/Tan wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-1A. If resistance is less than 5 ohms, replace fuel shutdown solenoid and perform TEST VER-1A.
9. Turn ignition off. Remove fuel shutdown relay. Inspect relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
10. Using scan tool in ohmmeter mode, check resistance of fuel shutdown relay output circuit (Red/Violet wire). If resistance is 5 ohms or more, repair open fuel shutdown relay output circuit and perform TEST VER-1A. If resistance is less than 5 ohms, go to next step.
11. Turn ignition on. Using scan tool in voltmeter mode, check voltage on fuel shutdown relay connector, fused B+ circuit (Red/Black wire). If voltage is 10 volts or less, repair open fused B+ circuit and perform TEST VER-1A. If voltage is more than 10 volts, go to next step.
12. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of fuel shutdown relay connector, ground circuit (Black/Tan wire). If resistance is more than 5 ohms, repair open ground circuit and perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
13. Remove starter relay. Inspect starter relay connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-1A. If connector and terminals are okay, go to next step.
14. Using an external ohmmeter, check resistance of starter relay output circuit (Brown wire) between fuel shutdown relay connector and starter relay connector. If resistance is more than 5 ohms, repair open starter relay output circuit and perform TEST VER-1A. If resistance is 5 ohms or less, replace fuel shutdown relay and perform TEST VER-1A.

TEST VER-1A - NO START VERIFICATION

1. Inspect vehicle to ensure all engine components are connected. Re-assemble and reconnect components as necessary. Inspect engine oil for fuel contamination. Change oil and filter if necessary. Go to next step.
2. Attempt to start engine. If engine does not start, check if any Technical Service Bulletins (TSBs) apply to vehicle. Return to DTC TEST if necessary. If engine starts, repair is complete.

TEST VER-2A - ROAD TEST VERIFICATION

1. If this test is being performed subsequent to an OBD-II test, perform TEST VER-5A. If this test is being performed subsequent to a NO TROUBLE CODE (NTC) test, go to next step. If this test is being performed subsequent to a TROUBLE CODE (TC) test, go to step 3).
2. Inspect vehicle to ensure all engine components are connected. Re-assemble and reconnect components as necessary. Check if initial symptom still exists. If initial or another symptom exists, repair is not complete. Check if any pertinent Technical Service Bulletins (TSBs) apply to vehicle and return to DTC TEST, if necessary.
3. If any DTCs have not been diagnosed, go to DTC TEST and finish diagnosing other DTCs. If all DTCs have been diagnosed, go to next step.
4. If Powertrain Control Module (PCM) has not been changed, connect scan tool to Data Link Connector (DLC). Erase DTCs. Using scan tool, reset all values in adaptive memory. Disconnect scan tool. Go to next step.
5. To ensure no other DTC remains, drive vehicle at least 5 minutes. While driving vehicle, attain a speed of 40 MPH. Stop vehicle. Turn engine off. Wait 10 seconds. Start engine and continue driving vehicle. Ensure transmission shifts through all gears. After road test, turn engine off. Go to next step.
6. Connect scan tool to DLC and read DTCs. If repaired DTC has reset, repair is not complete. Check all pertinent Technical Service Bulletins (TSBs), and return to DTC TEST if necessary. If another DTC exists, return to DTC TEST and follow path specified by other DTC. If no other DTCs exist, repair is now complete.

TEST VER-3A - CHARGING VERIFICATION

1. Inspect vehicle to ensure all engine components are connected. Re-assemble and reconnect components as necessary. If Powertrain Control Module (PCM) has been changed, go to next step. If PCM has not been changed, go to step 3).
2. Connect scan tool to Data Link Connector (DLC). If vehicle is not equipped with factory Vehicle Theft Security System (VTSS), go to next step. If vehicle is equipped with VTSS, start vehicle at least 20 times so VTSS can be activated when desired. Using scan tool, erase DTCs and go to next step.
3. To ensure no charging system problems exist, start engine. Increase engine speed to 2000 RPM for at least 30 seconds. Allow engine to idle. Turn engine off and go to next step.
4. Turn ignition on. Using scan tool, read DTCs. If repaired DTC has reset, repair is not complete. Check for related Technical Service Bulletins (TSBs) and return to DTC TEST, if necessary. If another DTC exists, return to DTC TEST and follow procedure specified by other DTC. If no other DTCs exist, repair is now complete.

TEST VER-4A - SPEED CONTROL VERIFICATION

1. Inspect vehicle to ensure all engine components are connected. Re-assemble and reconnect components as necessary. If Powertrain Control Module (PCM) has been changed, go to next step. If PCM has not been changed, go to step 3).
2. Connect scan tool to Data Link Connector (DLC). If vehicle is not equipped with factory Vehicle Theft Security System (VTSS), go to next step. If vehicle is equipped with VTSS, start vehicle at least 20 times so VTSS can be activated when desired. Using scan tool, erase DTCs and go to next step.
3. To ensure no speed control system problem exists, road test vehicle at a speed more than 35 MPH. Turn Speed Control (S/C) ON/OFF switch on. Depress and release SET switch. If S/C does not engage, repair is not complete. Check for related Technical Service Bulletins (TSBs) and return to DTC TEST, if necessary. If speed control engages, go to next step.
4. Quickly depress and release RESUME/ACCEL switch. If vehicle speed does not increase by 2 MPH, repair is not complete. Check for related TSBs and return to DTC TEST, if necessary. If vehicle speed increases by 2 MPH, go to next step.
5. Using caution, depress and release brake pedal. If S/C does not disengage, repair is not complete. Check for related TSBs and return to DTC TEST, if necessary. If S/C disengages, go to next step.
6. Increase vehicle speed to 35 MPH. Depress RESUME/ACCEL switch. If vehicle does not resume original speed, repair is not complete. Check for related TSBs and return to DTC TEST, if necessary. If vehicle resumes original speed, go to next step.
7. Hold SET switch down. If vehicle speed does not decrease, repair is not complete. Check for related TSBs and return to DTC TEST, if necessary. If vehicle speed decreases, go to next step.
8. Ensure vehicle speed is more than 35 MPH. Release SET switch. If vehicle speed does not adjust and set at a new vehicle speed, repair is not complete. Check for related TSBs and return to DTC TEST, if necessary. If vehicle speed adjusts and sets at a new vehicle speed, go to next step.
9. Turn ON/OFF switch off. If S/C does not disengage, repair is not complete. Check for related TSBs and return to DTC TEST, if necessary. If S/C disengages, system is operating correctly. Repair is complete.

TEST VER-5A - ROAD TEST FOR OBD-II DTCS

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If any DTCs have not been diagnosed, go to DTC TEST and finish diagnosing remaining DTCs as necessary. If all DTCs have been diagnosed, go to next step.
2. Connect scan tool to data link connector. Ensure fuel tank is at least 1/4 full. Ensure A/C is off and go to next step. NOTE: Proper way to ensure DTC has been repaired, is to allow Powertrain Control Module (PCM) to run scan tool monitors. Observe monitor operation on scan tool display. All specified enabling conditions for specified DTC must be met before PCM will operate monitors.
3. Using scan tool, observe pre-test enabling conditions until all conditions have been met. Once all enabling conditions are met, observe appropriate DTC monitor on scan tool display.
4. If repaired DTC has reset or was observed in monitor while on road test, repair is not complete. Check for related Technical Service Bulletins (TSBs) and return to DTC TEST, if necessary. If another DTC exists, return to DTC TEST and follow path specified by other DTC. If no other DTCs exist, repair is complete.

See also:
• TC-16A
• TC-10A
• TC-153A
• TC-112A
• TC-6A
• TC-5A
• TC-128A
• TC-107A
• TC-31A
• TC-30A
• TC-17A
• TC-140A
• TC-161A
• TC-113A
• TC-18A
• TC-151A
• TC-150A
• TC-49A
• TC-101A
• TC-119A
• TC-118A
• TC-11A
• TC-142A
• TC-141A
• TC-169A
• TC-168A
• TC-167A
• TC-171A
• TC-25A
• TC-43A
• TC-21A
• TC-58A
• TC-57A
• TC-157A
• TC-184A
• TC-166A
• TC-37A
• TC-36A
• TC-186A
• TC-106A
• TC-44A
• TC-1A
• TC-39A
• TC-40A
• TC-162A
• TC-35A
• TC-188A
• TC-48A
• TC-114A
• TC-82A
• TC-15A
• TC-87A
• TC-138A
• TC-27A
• TC-26A
• TC-148A
• TC-12A
• TC-132A
• TC-164A
• TC-75A
• TC-74A
• TC-50A
• TC-173A
• TC-103A
• TC-155A
• TC-192A
• TC-102A
• TC-62A
• TC-105A
• TC-126A
• TC-104A
• TC-156A
• TC-181A
• TC-66A
• TC-124A
• TC-122A
• TC-165A