Engine Controls - Tests W/codes - Turbo: Diagnosis Eagle Talon II

SYSTEM DIAGNOSTICS

DIAGNOSTIC PROCEDURE

Note. Diagnostic procedures must be performed in proper sequence using the following steps to ensure proper diagnosis.

1. Retrieve Diagnostic Trouble Codes (DTCs) from ECM. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-11311-S41886335362000111300000) under SELF-DIAGNOSTIC SYSTEM. Record DTC for future reference.
2. Clear DTCs from ECM. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11311-S18426386782000111300000) under SELF-DIAGNOSTIC SYSTEM. Road test vehicle using proper vehicle drive cycle. See «VEHICLE DRIVE CYCLE»(ref-11311-S08088201242000111300000) under SELF-DIAGNOSTIC SYSTEM.
3. Check for a trouble symptom. If trouble symptom, such as stalling or hard starting exists, proceed to trouble symptom inspection table and then perform a specified inspection procedure. Trouble symptom inspection table and trouble symptom inspection procedures are listed after the Diagnostic Trouble Code (DTC) tests. See «TROUBLE SYMPTOMS»(ref-11311-S11493446212000111300000) .
4. If no trouble symptom exists, retrieve DTCs from ECM. Using all DTCs obtained, proceed to «SELF-DIAGNOSTIC TESTS»(ref-11311-S36467877102000111300000) . Once all repairs are made, ensure DTCs are cleared from PCM. See procedures under «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11311-S18426386782000111300000) . Repeat vehicle drive cycle to ensure repair complete and DTC is not reset. See «VEHICLE DRIVE CYCLE»(ref-11311-S08088201242000111300000) under SELF-DIAGNOSTIC SYSTEM.

RETRIEVING DIAGNOSTIC TROUBLE CODES

Note. DTCs may be retrieved using Chrysler's Diagnostic Readout Box DRB-III scan tool. DRB-III may be used in general scan tool mode and DRB-III scan tool mode. Not all DTCs will be displayed in DRB-III scan tool mode. Use DRB-III in general scan tool mode and DRB-III scan tool mode when retrieving DTCs. Ensure battery is fully charged before retrieving DTCs.

Scheme 61

1. Ensure battery is fully charged. Ensure ignition is off. Connect scan tool to Data Link Connector (DLC), located below driver's side of instrument panel. (Scheme 61)
2. Turn ignition on. Using scan tool manufacturer's instructions, record all DTCs displayed on scan tool. If scan tool is able to communicate with ECM and all vehicle systems as necessary, go to step 4).
3. If scan tool is unable to communicate with ECM, or all vehicle systems, proceed to trouble symptom inspection table and then perform specified inspection procedure. Trouble symptom inspection table and trouble symptom inspection procedures are listed after the Diagnostic Trouble Code (DTC) tests. See «TROUBLE SYMPTOMS»(ref-11311-S11493446212000111300000).
4. Using all DTCs obtained, note DTC identification and perform specified DTC test. See DTC CODES, IDENTIFICATION & DTC TESTS table. Proceed to «SELF-DIAGNOSTIC TESTS»(ref-11311-S36467877102000111300000).
5. Once all repairs are made, ensure DTCs are cleared from ECM. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-11311-S18426386782000111300000) under SELF-DIAGNOSTIC SYSTEM. Perform vehicle drive cycle to ensure repair is complete and DTC is not reset. See «VEHICLE DRIVE CYCLE»(ref-11311-S08088201242000111300000) under SELF-DIAGNOSTIC SYSTEM.

CLEARING DIAGNOSTIC TROUBLE CODES

Turn ignition on. Using screen prompts on DRB-III scan tool, erase DTC from ECM. Repeat vehicle drive cycle to ensure repair is complete and DTC is not reset. See VEHICLE DRIVE CYCLE under SELF-DIAGNOSTIC SYSTEM.

SELF-DIAGNOSTIC TEST USAGE PROCEDURES

1. Before diagnosing an engine performance problem, refer to «INTRODUCTION»(ref-11311-S37466819282000111300000) for diagnostic system functions, abilities and system diagnostic procedures.
2. For Engine Control Module (ECM) connector terminal identification see scheme 3 For component general location see scheme 4
3. When performing specified DTC test, technician may be instructed to perform a specified trouble symptom inspection procedure, or check for possible cause by using the trouble symptom inspection table and then performing a specified inspection. Trouble symptom inspection table and trouble symptom inspection procedures are listed under «TROUBLE SYMPTOMS»(ref-11311-S11493446212000111300000).
4. Technician may be instructed to check for defective terminals or connections at a specified component or connector. It may be necessary to consult wiring diagram to determine which terminal or connection to check for specified component.
5. Technician may be instructed to perform scan tool service data inspection on a specified component. Scan tool is used to monitor operation of a specified component under a specified operating condition. Component operation is then compared to a normal operating range to determine if component is operating properly. Scan tool service data inspection procedure is listed after «TROUBLE SYMPTOMS»(ref-11311-S11493446212000111300000).
6. When performing a specified trouble symptom inspection procedure, technician may be instructed to perform a scan tool actuator test on a specified component. See procedures under «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000).

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

DTC TEST NO. 1 - VOLUME AIRFLOW SENSOR

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective volume airflow sensor, loose connector, open or shorted volume airflow sensor wiring circuit or defective ECM.

1. Ensure ignition is off. Disconnect connector from volume airflow sensor. Volume airflow sensor is located on passenger's side of engine compartment, near air cleaner. Install Test Harness (MB991348) between volume airflow sensor and the connector.
2. Start engine. Using voltmeter, check voltage between ground and test harness terminal No. 3 with engine idling. Voltage should be 2.2-3.2 volts.
3. If voltage is within specification, go to next step 4). If voltage is not within specification, check volume airflow sensor circuit. See INSPECTION PROCEDURE 43 under TROUBLE SYMPTOMS.
4. Using voltmeter, check voltage between ground and test harness terminal No. 7. Voltage should be 0-1 volt with engine idling, and 6-9 volts with engine at 2000 RPM. If voltage is within specification, replace ECM. The ECM is located below instrument panel, just in front of center console. If voltage is not within specification, go to next step.
5. Turn ignition off. Reinstall connector on volume airflow sensor. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
6. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 19 (Red/White wire) on 26-pin ECM connector B-53. Voltage should be 6-9 volts.
7. If voltage is within specs, check for defective terminals or connections on 26-pin ECM connector B-53. If terminals/connections are defective, repair as necessary. If terminals/connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS. If no trouble symptom exists, replace ECM.
8. If voltage is not within specification, check for defective terminals or connections on connector for volume airflow sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS. If no trouble symptom exists, replace volume airflow sensor.

DTC TEST NO. 2 - BAROMETRIC PRESSURE SENSOR

Note. Barometric pressure sensor is incorporated into the volume airflow sensor. For Engine Control Module (ECM) connector terminal identification see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective barometric pressure sensor, loose connector, open or shorted barometric pressure sensor wiring circuit or defective ECM.

1. Ensure ignition is off. Disconnect connector from volume airflow sensor. Volume airflow sensor is located on passenger's side of engine compartment, near air cleaner. Install Test Harness (MB991348) between volume airflow sensor and the connector.
2. Turn ignition on. Check voltage between test harness terminal No. 2 and ground. Voltage should be 3.7-4.3 volts with altitude of zero feet, or 3.2-3.8 volts with altitude of 3937 feet. If voltage is within specification, go to step 9). If voltage is not within specification, go to next step.
3. Turn ignition off. Disconnect connector from volume airflow sensor. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 1 (Green/Yellow wire) on wiring harness side of connector.
4. Voltage should be 4.8-5.2 volts. Turn ignition off. Using ohmmeter, check for continuity between ground and terminal No. 5 (Black wire) on wiring harness side of connector. Continuity should exist. If voltage is within specification and continuity exists, go to step 7). If voltage is not within specification or continuity does not exist, go to next step.
5. Check for defective terminals or connections on 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console.
6. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS. If no trouble symptom exists, check wiring harness between ECM and volume airflow sensor. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.
7. Check for defective terminals or connections on connector for volume airflow sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS.
8. If no trouble symptom exists, check wiring harness between ECM and barometric pressure sensor on volume airflow sensor. The ECM is located below instrument panel, just in front of center console. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace volume airflow sensor.
9. Turn ignition off. Reinstall connector on volume airflow sensor. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 85 (Orange wire) on 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console. Voltage should be 3.7-4.3 volts with altitude of zero feet, or 3.2-3.8 volts with altitude of 3937 feet.
10. If voltage is within specification, go to next step. If voltage is not within specification, check wiring harness between ECM and barometric pressure sensor on volume airflow sensor. Repair wiring harness if necessary.
11. Check for defective terminals or connections on 22-pin ECM connector B-56. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS. If no trouble symptom exists, replace ECM.

DTC TEST NO. 3 - INTAKE AIR TEMPERATURE SENSOR

Note. Intake air temperature sensor is incorporated into the volume airflow sensor. For Engine Control Module (ECM) connector terminal identification see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective intake air temperature sensor, loose connector, open or shorted intake air temperature sensor wiring circuit or defective ECM.

1. Check intake air temperature sensor. See procedures in the SYSTEM/COMPONENT TESTS article. If intake air temperature sensor is okay, go to next step. If intake air temperature sensor is defective, replace volume airflow sensor.
2. Ensure ignition is off. Disconnect connector from volume airflow sensor. Volume airflow sensor is located on passenger's side of engine compartment, near air cleaner.
3. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 6 (Red/Blue wire) on wiring harness side of connector.
4. Voltage should be 4.5-4.9 volts. Turn ignition off. Using ohmmeter, check for continuity between ground and terminal No. 5 (Black wire) on wiring harness side of connector. Continuity should exist. If voltage is within specification and continuity exists, go to step 7). If voltage is not within specification or continuity does not exist, go to next step.
5. Check for defective terminals or connections on ECM 22-pin connector B-56. The ECM is located below instrument panel, just in front of center console.
6. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS. If no trouble symptom exists, check wiring harness between ECM and intake air temperature sensor on volume airflow sensor. If wiring harness is okay, replace ECM. If wiring harness is defective, repair wiring harness.
7. Check for defective terminals or connections on connector for volume airflow sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS. If no trouble symptom exists, replace ECM.

DTC TEST NO. 4 - ENGINE COOLANT TEMPERATURE SENSOR

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective engine coolant temperature sensor, loose connector, open or shorted engine coolant temperature sensor wiring circuit or defective ECM.

1. Engine coolant temperature sensor is located in coolant housing on passenger's side front of engine, just below coolant filler cap. Engine coolant temperature sensor has a Black wire and a Black/White wire in the connector.
2. Check engine coolant temperature sensor. See procedures in the SYSTEM/COMPONENT TESTS article. If engine coolant temperature sensor is okay, go to next step. If engine coolant temperature sensor is defective, replace engine coolant temperature sensor.
3. Ensure ignition is off. Disconnect connector from engine coolant temperature sensor. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 1 (Black/White wire) on wiring harness side of connector.
4. Voltage should be 4.5-4.9 volts. Turn ignition off. Using ohmmeter, check for continuity between ground and terminal No. 2 (Black wire) on wiring harness side of connector. Continuity should exist. If voltage is within specification and continuity exists, go to step 7). If voltage is not within specification or continuity does not exist, go to next step.
5. Check for defective terminals or connections on ECM 22-pin connector B-56. The ECM is located below instrument panel, just in front of center console.
6. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS. If no trouble symptom exists, check wiring harness between ECM and engine coolant temperature sensor. If wiring harness is okay, replace ECM. If wiring harness is defective, repair wiring harness.
7. Check for defective terminals or connections on connector for engine coolant temperature sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS. If no trouble symptom exists, replace ECM.

DTC TEST NO. 5 - THROTTLE POSITION CIRCUIT

Note. Closed throttle position switch is incorporated in the throttle position sensor. For Engine Control Module (ECM) connector terminal identification see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: improperly adjusted throttle position sensor, defective throttle position sensor or closed throttle position switch, open or shorted throttle position sensor wiring circuit, shorted closed throttle position switch wiring circuit or defective ECM.

1. Using scan tool, perform scan tool service data inspection procedure on closed throttle position switch. See procedures under «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
2. With throttle at idle position, closed throttle position switch status should be ON. With throttle slightly open, closed throttle position switch status should be OFF.
3. If switch status is correct, go to next step. If switch status is incorrect, go to DTC TEST NO. 25.
4. Check throttle position sensor. See procedures in SYSTEM/COMPONENT TESTS article. If throttle position sensor is okay, go to next step. If throttle position sensor is defective, replace throttle position sensor.
5. Ensure ignition is off. Disconnect connector from throttle position sensor. Throttle position sensor is mounted on side of throttle body and contains a 4-pin Gray connector. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 1 (Green/Yellow wire) on wiring harness side of connector.
6. Voltage should be 4.8-5.2 volts. Turn ignition off. Using ohmmeter, check for continuity between ground and terminal No. 4 (Black wire) on wiring harness side of connector. Continuity should exist. If voltage is within specification and continuity exists, go to step 9). If voltage is not within specification or continuity does not exist, go to next step.
7. Check for defective terminals or connections on 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console.
8. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) under TROUBLE SYMPTOMS. If no trouble symptom exists, check wiring harness between ECM and throttle position sensor. If wiring harness is okay, replace ECM. If wiring harness is defective, repair wiring harness.
9. If voltage is within specification and continuity exists, check throttle position sensor output circuit. See procedures under INSPECTION PROCEDURE 44 under TROUBLE SYMPTOMS.

DTC TEST NO. 6 - EXCESSIVE TIME TO ENTER CLOSED LOOP

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective front oxygen sensor, defective injector or defective ECM.

1. Check front oxygen sensor. Front oxygen sensor is mounted on outlet elbow on turbocharger, near exhaust pipe. See procedures in the SYSTEM/COMPONENT TESTS article.
2. If front oxygen sensor is okay, go to next step. If front oxygen sensor is defective, replace front oxygen sensor.
3. Check for defective terminals or connections at connector on front oxygen sensor and 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console.
4. If terminals and connections are okay on front oxygen sensor and ECM, go to next step. If any terminals or connections are defective on front oxygen sensor or ECM, repair as necessary.
5. Check wiring harness between ECM and front oxygen sensor. If wiring harness is okay, go to next step. If wiring harness is defective, repair wiring harness.
6. Check injectors. See the SYSTEM/COMPONENT TESTS article. If injectors are okay, go to next step. If any injectors are defective, replace injector.
7. Check for defective terminals or connections on all connectors at injectors and 26-pin ECM connector B-53. If terminals and connections are okay on all components, go to next step. If any terminals or connections are defective on any component, repair as necessary.
8. Check wiring harness between ECM and each injector. If wiring harness is not defective on all components, go to next step. If wiring harness is defective on any component, repair wiring harness.
9. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is within specification, replace ECM. If fuel pressure is not within specification, repair fuel system as necessary.

DTC TEST NO. 7 - FRONT OXYGEN SENSOR

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective front oxygen sensor, open circuit in front oxygen sensor output signal wire or defective ECM.

1. Check front oxygen sensor. Front oxygen sensor is mounted on outlet elbow on turbocharger, near exhaust pipe. See procedures in the SYSTEM/COMPONENT TESTS article.
2. If front oxygen sensor is okay, go to next step. If front oxygen sensor is defective, replace front oxygen sensor.
3. Check for defective terminals or connections at connector on front oxygen sensor and 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console.
4. If terminals and connections are okay on front oxygen sensor and ECM, go to next step. If any terminals or connections are defective on front oxygen sensor or ECM, repair as necessary.
5. Check for a trouble symptom. For specific symptoms see «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check wiring harness between ECM and front oxygen sensor. If wiring harness is okay, go to next step. If wiring harness is defective, repair wiring harness.
6. Replace front oxygen sensor, and then check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, replace ECM.

DTC TEST NO. 8 - FRONT OXYGEN SENSOR HEATER

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: open or shorted front oxygen sensor wiring circuit, open in front oxygen sensor heater or defective ECM.

Scheme 62

1. Check front oxygen sensor. Front oxygen sensor is mounted on front exhaust pipe, near exhaust manifold. See procedures in SYSTEM/COMPONENT TESTS article.
2. If front oxygen sensor is okay, go to next step. If front oxygen sensor is defective, replace front oxygen sensor.
3. Ensure ignition is off. Disconnect connector from front oxygen sensor. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 1 (Red wire) on wiring harness side of connector.
4. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between front oxygen sensor and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article. (Scheme 62): Identifying Fuel Pump MFI Relays
5. Ensure ignition is off. Reinstall connector on front oxygen sensor. Disconnect 12-pin ECM connector B-55 from ECM. The ECM is located below instrument panel, just in front of center console.
6. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 60 (Yellow wire) on wiring harness side of connector. Battery voltage should exist.
7. If battery voltage exists, go to step 9). If battery voltage does not exist, check for defective terminals or connections at front oxygen sensor.
8. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, check wiring harness between ECM and front oxygen sensor. If wiring harness is defective, repair wiring harness.
9. Check for defective terminals or connections at 12-pin ECM connector B-55. If terminals and connections are okay, go to next step. If any terminals or connections are defective, repair as necessary.
10. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

DTC TEST NO. 9 - REAR OXYGEN SENSOR

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective rear oxygen sensor, open circuit in rear oxygen sensor output signal wire or defective ECM.

1. Check rear oxygen sensor. Rear oxygen sensor is mounted on exhaust pipe, behind catalytic converter. See procedures in SYSTEM/COMPONENT TESTS article.
2. If rear oxygen sensor is okay, go to next step. If rear oxygen sensor is defective, replace rear oxygen sensor.
3. Check for defective terminals or connections at connector on rear oxygen sensor and 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console.
4. If terminals and connections are okay on rear oxygen sensor and ECM, go to next step. If any terminals or connections are defective on rear oxygen sensor or ECM, repair as necessary.
5. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check wiring harness between ECM and rear oxygen sensor. If wiring harness is okay, go to next step. If wiring harness is defective, repair wiring harness.
6. Replace rear oxygen sensor, and then check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, replace ECM.

DTC TEST NO. 10 - REAR OXYGEN SENSOR HEATER

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: open or shorted rear oxygen sensor wiring circuit, open circuit in rear oxygen sensor heater or defective ECM.

1. Check rear oxygen sensor. Rear oxygen sensor is mounted on exhaust pipe, behind catalytic converter. See procedures in SYSTEM/COMPONENT TESTS article.
2. If rear oxygen sensor is okay, go to next step. If rear oxygen sensor is defective, replace rear oxygen sensor.
3. Ensure ignition is off. Disconnect connector from rear oxygen sensor. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 3 (Red wire) on wiring harness side of connector.
4. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between rear oxygen sensor and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
5. Ensure ignition is off. Reinstall connector on rear oxygen sensor. Disconnect 12-pin ECM connector B-55 from ECM. The ECM is located below instrument panel, just in front of center console.
6. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 54 (Yellow/Black wire) on wiring harness side of connector. Battery voltage should exist.
7. If battery voltage exists, go to step 9). If battery voltage does not exist, check for defective terminals or connections at rear oxygen sensor.
8. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, check wiring harness between ECM and rear oxygen sensor. If wiring harness is defective, repair wiring harness.
9. Check for defective terminals or connections at 12-pin ECM connector B-55. If terminals and connections are okay, go to next step. If any terminals or connections are defective, repair as necessary.
10. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

DTC TEST NO. 11 - FUEL TRIM MALFUNCTION

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective volume airflow sensor or injector, incorrect fuel pressure, vacuum leak, defective oxygen sensor or engine coolant temperature sensor, defective intake air temperature sensor, defective barometric pressure sensor or defective ECM.

1. Using scan tool, perform scan tool service data inspection procedure on intake air temperature sensor. See procedures under «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
2. If intake air temperature sensor is operating within specification, go to next step. If intake air temperature sensor is not operating within specification, perform DTC TEST NO. 3.
3. Using scan tool, perform scan tool service data inspection procedure on engine coolant temperature sensor. See procedures under «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
4. If engine coolant temperature sensor is operating within specification, go to next step. If engine coolant temperature sensor is not operating within specification, perform DTC TEST NO. 4.
5. Using scan tool, perform scan tool service data inspection procedure on barometric pressure sensor. See procedures under «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
6. If barometric pressure sensor is operating within specification, go to next step. If barometric pressure sensor is not operating within specification, perform DTC TEST NO. 2.
7. Check injectors. See the SYSTEM/COMPONENT TESTS article. If injectors are okay, go to next step. If any injectors are defective, replace injector.
8. Check for defective terminals or connections on all connectors at injectors and 26-pin ECM connector B-53. If terminals and connections are okay on all components, go to next step. If any terminals or connections are defective on any component, repair as necessary.
9. Check for defective wiring harness between each injector and 26-pin ECM connector B-53. If wiring harness is defective, repair wiring harness. If wiring harness is okay, go to next step.
10. Using scan tool, perform scan tool service data on long-term fuel compensation. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
11. If fuel trim is less than zero, go to step 14). If fuel trim is more than zero, check that air was drawn into air intake system. If air was drawn into air intake system, go to next step. If air was not drawn into air intake system, repair components as necessary.
12. Using scan tool, perform scan tool service data on volume airflow sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
13. If volume airflow sensor operation is less than the specified value, replace volume airflow sensor. If volume airflow sensor operation is not less than the specified value, replace ECM. The ECM is located below instrument panel, just in front of center console.
14. Using scan tool, perform scan tool service data on volume airflow sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
15. If volume airflow sensor operation is more than the specified value, replace volume airflow sensor. If volume airflow sensor operation is not more than the specified value, replace ECM. The ECM is located below instrument panel, just in front of center console.

DTC TEST NO. 12 - INJECTOR CIRCUIT

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective injector, loose connector, open or shorted injector wiring circuit or defective ECM.

Scheme 63

1. Check fuel injectors and fuel injector resistor. See procedures in the SYSTEM/COMPONENT TESTS article. If injectors and fuel injector resistor are okay, go to next step. If any injectors or fuel injector resistor are defective, replace components as necessary.
2. Ensure ignition is off. Disconnect connector at fuel injector resistor. Fuel injector resistor is located near throttle body. (Scheme 63) (Scheme 63): Identifying Fuel Injector Resistor
3. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 3 (Red wire) on wiring harness side of connector.
4. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between fuel injector resistor and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
5. Ensure ignition is off. Reinstall connector on fuel injector resistor. Disconnect connectors at fuel injectors. Turn ignition on. Using voltmeter, check voltage between ground and specified terminal on connector of each injector. See INJECTOR TERMINAL IDENTIFICATION table. INJECTOR TERMINAL IDENTIFICATION (1) Injector No. Connector Terminal No. (Wire Color) 1 1 (Red/Blue) 2 1 (Green/Black) 3 1 (Green/Red) 4 1 (Green) (1) Injector No. 1 is at timing belt end of engine and injector No. 4 is at flywheel end of engine.
6. Battery voltage should exist. If battery voltage exists, go to step 8). If battery voltage does not exist, check for defective terminals or connections at connector on fuel injector resistor.
7. If any terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, check wiring harness between fuel injector resistor and connector for injector. Repair wiring harness as necessary.
8. If voltage is within specification, check injector control circuit. Perform INSPECTION PROCEDURE 45.

DTC TEST NO. 13 - RANDOM MISFIRE

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective ignition system, poor crankshaft position sensor signal, incorrect air/fuel ratio, low engine compression or defective ECM.

Scheme 64

1. Using scan tool, perform scan tool service data on crankshaft position sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000). If crankshaft position sensor operates correctly, go to next step. If crankshaft position sensor operates incorrectly, go to step 4).
2. Crankshaft position sensor wave pattern should be checked. Ensure ignition is off. Connect oscilloscope pick-up lead to terminal No. 89 (Blue/White wire) of 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console.
3. Start engine and allow engine to idle. Crankshaft position sensor wave pattern should pulse regularly. (Scheme 64) If crankshaft position sensor wave pattern is correct, go to step 7). If crankshaft position sensor wave pattern is incorrect, go to step 4). (Scheme 64): Identifying Crankshaft Position Sensor Wave Pattern NOTE: Crankshaft position sensor is located inside timing belt cover, behind timing belt, near crankshaft sprocket on intake manifold side of engine. Crankshaft position sensor contains a 3-pin Black connector with Red, Black and Blue/White wires in the connector, which is located near timing belt cover.
4. Check for defective terminals or connections on crankshaft position sensor and 22-pin ECM connector B-56. If terminals and connections are okay, go to next step. If any terminals or connections are defective on any component, repair as necessary.
5. Check wiring harness between crankshaft position sensor and ECM. If wiring harness is okay, go to next step. If wiring harness is defective, repair as necessary.
6. Check for proper installation of crankshaft position sensor and sensor plate on crankshaft. Sensor plate is located behind sprocket on front of crankshaft. If crankshaft position sensor or sensor plate are improperly installed, repair as necessary. If crankshaft position sensor and sensor plate are properly installed, replace crankshaft position sensor.
7. Using scan tool, perform scan tool service data on long-term fuel compensation. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000).
8. If long-term fuel compensation is within specification, go to next step. If long-term fuel compensation is not within specification, perform DTC TEST NO. 11.
9. Using scan tool, perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000).
10. If engine coolant temperature sensor operation is within specification, go to next step. If engine coolant temperature sensor operation is not within specification, perform DTC TEST NO. 4.
11. Check ignition coil, spark plugs and spark plug wires. If ignition system components are defective, repair as necessary. If ignition system components are okay, check engine compression. See the «BASIC TESTING - TURBO»(ref-11296) article. Repair engine if engine compression is not within specification.

DTC TEST NO. 14 - CYLINDER MISFIRE

Note. Possible causes for DTC are: defective ignition system, defective injector or defective ECM.

Check spark plugs and spark plug wires. If ignition system components are defective, repair as necessary. If ignition system components are okay, check fuel injectors. See procedures in SYSTEM/COMPONENT TESTS article. Replace injector if defective.

DTC TEST NO. 15 - KNOCK SENSOR

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective knock sensor, loose connector, open or shorted knock sensor wiring circuit or defective ECM.

1. Ensure ignition is off. Disconnect connector from knock sensor. Knock sensor is located on side of cylinder block, just below intake manifold. Knock sensor contains a 2-pin Gray connector with White and Black/White wires in the connector.
2. Using ohmmeter, check continuity between ground and terminal No. 2 (Black/White wire) on wiring harness side of connector for knock sensor. If continuity exists, go to next step. If continuity does not exist, repair open circuit on Black/White wire between knock sensor and ground.
3. Check for defective terminals or connections at knock sensor and 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console. If terminals and connections are okay, go to next step. If any terminals or connections are defective, repair as necessary.
4. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, go to next step.
5. Check wiring harness between ECM and knock sensor. If wiring harness is okay, go to next step. If wiring harness is defective, repair wiring harness.
6. Replace knock sensor and check for a trouble symptom. See the the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If trouble symptom exists, replace ECM.

DTC TEST NO. 16 - CRANKSHAFT POSITION SENSOR

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective crankshaft position sensor, loose connector, open or shorted crankshaft position sensor wiring circuit or defective ECM.

1. Ensure ignition is off. Disconnect connector from crankshaft position sensor. Crankshaft position sensor is located inside timing belt cover, behind timing belt, near crankshaft sprocket on intake manifold side of engine. Crankshaft position sensor contains a 3-pin Black connector with Red, Black and Blue/White wires in the connector which is located near top of timing belt cover.
2. Install Test Harness (MD998478) between crankshaft position sensor and the connector. Using voltmeter, check voltage between ground and test harness terminal No. 2 (Black clip) while cranking engine. Voltage should be.4-4.0 volts. Start engine and note voltage with engine idling. Voltage should be 1.5-2.5 volts.
3. If voltage is not within specification, go to next step. If voltage is within specification, replace ECM. The ECM is located below instrument panel, just in front of center console.
4. Shut engine off. Remove test harness. With connector disconnected from crankshaft position sensor, turn ignition on. Using voltmeter, check voltage between ground and terminal No. 3 (Red wire) on wiring harness side of connector.
5. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between crankshaft position sensor and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
6. With ignition still on, using voltmeter, check voltage between ground terminal No. 2 (Blue/White wire) on wiring harness side of connector. Voltage should be 4.8-5.2 volts.
7. If voltage is within specification, go to step 9). If voltage is not within specification, check for defective terminals or connections on 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
8. If no trouble symptom exists, check wiring harness between crankshaft position sensor and ECM. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.
9. Turn ignition off. Using ohmmeter, check for continuity between ground and terminal No. 1 (Black wire) on wiring harness side of connector.
10. Continuity should exist. If continuity exists, go to next step. If continuity does not exist, check for open ground circuit on wiring harness for crankshaft position sensor. Repair wiring harness as necessary.
11. Check for defective terminals or connections on crankshaft position sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace crankshaft position sensor.

DTC TEST NO. 17 - CAMSHAFT POSITION SENSOR

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective camshaft position sensor, loose connector, open or shorted camshaft position sensor wiring circuit or defective ECM.

1. Ensure ignition is off. Camshaft position sensor is located inside timing belt cover, behind timing belt, near camshaft sprocket on intake manifold side of engine. Camshaft position sensor contains a 3-pin Gray connector with Red, Black and Blue/Red wires in the connector which is located near top of timing belt cover.
2. Using voltmeter, check voltage between ground and terminal No. 2 (Blue/Red wire) on wiring harness side of connector for camshaft position sensor while cranking engine. Voltage should be.4-3.0 volts. Start engine and note voltage with engine idling. Voltage should be.5-2.0 volts.
3. If voltage is not within specification, go to next step. If voltage is within specification, replace ECM. The ECM is located below instrument panel, just in front of center console.
4. Shut engine off. Disconnect connector for camshaft position sensor. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 3 (Red wire) on wiring harness side of connector.
5. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between camshaft position sensor and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
6. With ignition still on, using voltmeter, check voltage between ground and terminal No. 2 (Blue/Red wire) on wiring harness side of connector. Voltage should be 4.8-5.2 volts.
7. If voltage is within specification, go to step 9). If voltage is not within specification, check for defective terminals or connections on 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
8. If no trouble symptom exists, check wiring harness between camshaft position sensor and ECM. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.
9. Turn ignition off. Using ohmmeter, check for continuity between ground and terminal No. 1 (Black wire) on wiring harness side of connector.
10. Continuity should exist. If continuity exists, go to next step. If continuity does not exist, check for open ground circuit on wiring harness for camshaft position sensor. Repair wiring harness as necessary.
11. Check for defective terminals or connections on camshaft position sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace camshaft position sensor.

DTC TEST NO. 18 - EGR MALFUNCTION

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

Note. Possible causes for DTC are: EGR valve does not open, defective EGR solenoid, loose connector, open or shorted EGR solenoid wiring circuit, low vacuum, defective manifold differential pressure sensor or defective ECM.

1. Check EGR system. See the SYSTEM/COMPONENT TESTS article.
2. If EGR system operates correctly, go to step 4). If EGR system does not operate correctly, check EGR solenoid. See procedures in the SYSTEM/COMPONENT TESTS article.
3. If EGR solenoid is defective, replace EGR solenoid. If EGR solenoid is okay, check vacuum hoses, vacuum supply and EGR valve. Replace components as necessary.
4. Using scan tool, perform scan tool service data inspection procedure on manifold differential pressure sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
5. If manifold differential pressure sensor is not operating within specification, perform DTC TEST NO. 33. If manifold differential pressure sensor is operating within specification, check EGR valve operation.

DTC TEST NO. 19 - EGR SOLENOID

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective EGR solenoid, loose connector, open or shorted EGR solenoid wiring circuit or defective ECM.

Scheme 65

1. Check EGR solenoid. See the SYSTEM/COMPONENT TESTS article. If EGR solenoid operates correctly, go to next step. If EGR solenoid does not operate correctly, replace EGR solenoid.
2. Ensure ignition is off. Disconnect connector from EGR solenoid. EGR solenoid is located on firewall, just below wiper arm. (Scheme 65) (Scheme 65): Identifying EGR & EVAP Purge Solenoids
3. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 1 (Red wire) on wiring harness side of connector.
4. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between EGR solenoid and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
5. Turn ignition off. Reinstall connector on EGR solenoid. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
6. Disconnect 26-pin ECM connector B-53 from ECM. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 6 (Light Green/Red wire) on 26-pin ECM connector B-53. Battery voltage should exist.
7. If battery voltage exists, go to step 9). If battery voltage does not exist, check for defective terminals or connections at EGR solenoid. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
8. If no trouble symptom exists, check wiring harness between EGR solenoid and ECM. If wiring harness is defective, repair wiring harness.
9. Check for defective terminals or connections on 26-pin ECM connector B-53. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

DTC TEST NO. 20 - CATALYTIC SYSTEM EFFICIENCY

Note. Possible causes for DTC are: defective catalytic converter or ECM.

1. Check exhaust manifold for cracks. If exhaust manifold is okay, go to next step. If exhaust manifold is cracked, replace exhaust manifold.
2. Replace catalytic converter, and check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) .
3. If no trouble symptom exists, replace ECM. The ECM is located below instrument panel, just in front of center console.

DTC TEST NO. 21 - EVAP EMISSION CONTROL SYSTEM

Note. Possible causes for DTC are: defective EVAP purge solenoid, loose connector, open or shorted EVAP purge solenoid wiring circuit, defective vacuum hoses or defective ECM.

1. Check EVAP emission control system. See procedures in the SYSTEM/COMPONENT TESTS article.
2. If EVAP emission control system operates correctly, go to step 4). If EVAP emission control system does not operate correctly, check vacuum hoses, vacuum supply from throttle body, and EVAP purge solenoid. See procedures in the SYSTEM/COMPONENT TESTS article.
3. If any components are defective, replace as necessary. If all vacuum hoses, vacuum supply from throttle body, and EVAP purge solenoid are okay, perform DTC TEST NO. 22.
4. Disconnect vacuum supply hose from throttle body for EVAP emission control system. This is the vacuum hose with Red strip, and is located on top of throttle body, closest to the throttle position sensor.
5. Check that vacuum exists with engine running. If vacuum exists, go to next step. If no vacuum exists, check for restricted vacuum port on throttle body.
6. Check defective vapor hose between fuel tank and EVAP purge canister. Replace vapor hose if necessary.

DTC TEST NO. 22 - EVAP PURGE SOLENOID

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective EVAP purge solenoid, loose connector, open or shorted EVAP purge solenoid wiring circuit or defective ECM.

1. Check EVAP purge solenoid. See procedures in SYSTEM/COMPONENT TESTS article. If EVAP purge solenoid operates correctly, go to next step. If EVAP purge solenoid does not operate correctly, replace EVAP purge solenoid.
2. Ensure ignition is off. Disconnect connector from EVAP solenoid. EVAP purge solenoid is located on firewall, just below wiper arm. (Scheme 65)
3. Turn ignition on. Using voltmeter, check voltage between ground terminal No. 2 (Red wire) on wiring harness side of connector.
4. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between EVAP purge solenoid and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
5. Turn ignition off. Reinstall connector on EVAP purge solenoid. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
6. Disconnect 26-pin ECM connector B-53 from ECM. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 9 (Light Green/Black wire) on 26-pin ECM connector B-53. Battery voltage should exist.
7. If battery voltage exists, go to step 9). If battery voltage does not exist, check for defective terminals or connections at EVAP purge solenoid. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
8. If no trouble symptom exists, check wiring harness between EVAP purge solenoid and ECM. If wiring harness is defective, repair wiring harness.
9. Check for defective terminals or connections on 26-pin ECM connector B-53. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

DTC TEST NO. 23 - VEHICLE SPEED SENSOR

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective vehicle speed sensor, loose connector, open or shorted vehicle speed sensor wiring circuit or defective ECM.

1. Check speedometer operation. If speedometer operates correctly, go to next step. If speedometer does not operate correctly, check vehicle speed sensor. See the SYSTEM/COMPONENT TESTS article.
2. Raise and support vehicle so front wheels can rotate. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
3. Ensure ignition is off. Disconnect 22-pin ECM connector B-56 from ECM. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 86 (Yellow wire) on 22-pin ECM connector B-56 while rotating front wheels. Voltage should repeatedly alternate from no voltage to 5 volts while rotating front wheels.
4. If voltage alternates correctly, go to next step. If voltage does not alternate correctly, check wiring harness between ECM and vehicle speed sensor. Vehicle speed sensor is located on transaxle. (Scheme 66) Repair wiring harness as necessary.
5. Check for defective terminals or connections on 22-pin ECM connector B-56. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

Identifying Vehicle Speed Sensor. Scheme 66

DTC TEST NO. 24 - IDLE CONTROL SYSTEM

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective idle air control motor, loose connector, open or shorted idle air control motor wiring circuit or defective ECM.

1. Check idle air control motor. See procedures in SYSTEM/COMPONENT TESTS article. If idle air control motor operates correctly, go to next step. If idle air control motor does not operate correctly, replace idle air control motor.
2. Ensure ignition is off. Disconnect connector at idle air control motor. Idle air control motor is mounted on throttle body and contains a 6-pin Black connector.
3. Turn ignition on. Using voltmeter, check voltage between ground and terminals No. 2 (Red wire) and No. 5 (Red wire) on wiring harness side of connector.
4. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between idle air control motor and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
5. Turn ignition off. Reinstall connector on idle air control motor. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
6. Disconnect 26-pin ECM connector B-53 from ECM. Turn ignition on. Using voltmeter, check voltage between ground and terminals No. 4 (Gray wire), No. 5 (Gray/Blue wire), No. 17 (Gray/Black wire) and No. 18 (Gray/Yellow wire) on 26-pin ECM connector B-53. Battery voltage should exist.
7. If battery voltage exists, go to step 9). If battery voltage does not exist, check for defective terminals or connections at idle air control motor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
8. If no trouble symptom exists, check wiring harness between idle air control motor and ECM. If wiring harness is defective, repair wiring harness.
9. Check for defective terminals or connections on 26-pin ECM connector B-53. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

DTC TEST NO. 25 - CLOSED THROTTLE POSITION SWITCH

Note. Closed throttle position switch is incorporated into throttle position sensor. For Engine Control Module (ECM) connector terminal identification see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective closed throttle position switch, loose connector, open or shorted closed throttle position switch wiring circuit or defective ECM.

1. Check closed throttle position switch. See procedures in the SYSTEM/COMPONENT TESTS article. If closed throttle position switch operates correctly, go to next step. If closed throttle position switch does not operate correctly, replace throttle position sensor.
2. Ensure ignition is off. Disconnect connector at throttle position sensor. Throttle position sensor is mounted on side of throttle body and contains a 4-pin Gray connector.
3. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 3 (Yellow/Red wire) on wiring harness side of connector.
4. Voltage should be at least 4 volts. Turn ignition off. Using ohmmeter, check for continuity between ground and terminal No. 4 (Black wire) on wiring harness side of connector. Continuity should exist. If voltage is within specification, and continuity exists, go to step 7). If voltage is not within specification, or continuity does not exist, go to next step.
5. Check for defective terminals or connections on 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console.
6. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check wiring harness between ECM and throttle position sensor. If wiring harness is okay, replace ECM. If wiring harness is defective, repair wiring harness.
7. Check for defective terminals or connections at throttle position sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, replace ECM.

DTC TEST NO. 26 - TRANSAXLE CONTROL SYSTEM

Note. Possible causes for DTC are: defective transaxle control system, open or shorted communication line between Engine Control Module (ECM) and Transmission Control Module (TCM) or defective ECM.

When a failure exists in the transaxle control system, TCM delivers a malfunction signal to the ECM. Check TCM and transaxle control system. See the appropriate TRANSAXLE article for transaxle diagnosis.

DTC TEST NO. 27 - TRANSAXLE RANGE SENSOR

Note. Possible causes for DTC are: defective park/neutral switch, loose connector, open or shorted park/neutral switch wiring circuit or defective ECM.

When park/neutral switch failure exists, Transmission Control Module (TCM) delivers a malfunction signal to the Engine Control Module (ECM). Check TCM and transaxle control system. See the appropriate TRANSAXLE article for transaxle diagnosis.

DTC TEST NO. 28 - TRANSAXLE FLUID TEMP. SENSOR

Note. Possible causes for DTC are: defective transaxle fluid temp. sensor, loose connector, open or shorted transaxle fluid temp. sensor wiring circuit or defective ECM.

When transaxle fluid temperature sensor failure exists, Transmission Control Module (TCM) delivers a malfunction signal to the Engine Control Module (ECM). Check TCM and transaxle control system. See the appropriate TRANSAXLE article for transaxle diagnosis.

DTC TEST NO. 29 - TURBOCHARGER WASTEGATE ACTUATOR

Note. Possible causes for DTC are: defective turbocharger wastegate actuator, defective charge pressure control system or defective ECM.

The Engine Control Module (ECM) monitors intake air volume to ensure engine is not receiving excessive pressure from the turbocharger. If excessive pressure exists, the ECM will shut off the fuel. When excessive pressure exists with fuel being shutoff, DTC is stored in the ECM. Check turbocharger and components. See procedures in the SYSTEM/COMPONENT TESTS article.

DTC TEST NO. 30 - TURBOCHARGER WASTEGATE SOLENOID

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective turbocharger wastegate solenoid, loose connector, open or shorted turbocharger wastegate solenoid wiring circuit or defective ECM.

Scheme 67

1. Check turbocharger wastegate solenoid. See procedures in the SYSTEM/COMPONENT TESTS article. If turbocharger wastegate solenoid operates correctly, go to next step. If turbocharger wastegate solenoid does not operate correctly, replace turbocharger wastegate solenoid.
2. Ensure ignition is off. Disconnect connector at turbocharger wastegate solenoid. Turbocharger wastegate solenoid is located at passenger's side of engine compartment, just below air cleaner and contains a 2-pin Black connector with Red and Red/Yellow wires in the connector. (Scheme 67) (Scheme 67): Identifying Turbocharger Wastegate Solenoid
3. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 2 (Red wire) on wiring harness side of connector.
4. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between turbocharger wastegate solenoid and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
5. Turn ignition off. Reinstall connector on turbocharger wastegate solenoid. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
6. Disconnect 26-pin ECM connector B-53 from ECM. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 11 (Red/Yellow wire) on 26-pin ECM connector B-53. Battery voltage should exist.
7. If battery voltage exists, go to step 9). If battery voltage does not exist, check for defective terminals or connections at turbocharger wastegate solenoid. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
8. If no trouble symptom exists, check wiring harness between turbocharger wastegate solenoid and ECM. If wiring harness is defective, repair wiring harness.
9. Check for defective terminals or connections on 26-pin ECM connector B-53. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

DTC TEST NO. 31 - FUEL PRESSURE SOLENOID

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective fuel pressure solenoid, loose connector, open or shorted fuel pressure solenoid wiring circuit or defective ECM.

Scheme 68

1. Check fuel pressure solenoid. See procedures in SYSTEM/COMPONENT TESTS article. If fuel pressure solenoid operates correctly, go to next step. If fuel pressure solenoid does not operate correctly, replace fuel pressure solenoid.
2. Ensure ignition is off. Disconnect connector at fuel pressure solenoid. Fuel pressure solenoid is located on firewall on driver's side of engine compartment, near brake booster and contains a 2-pin Black connector with Red and Blue/Red wires in the connector. (Scheme 68) (Scheme 68): Identifying Fuel Pressure Solenoid
3. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 1 (Red wire) on wiring harness side of connector.
4. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between fuel pressure solenoid and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. (Scheme 62) Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
5. Turn ignition off. Reinstall connector on fuel pressure solenoid. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
6. Disconnect 26-pin ECM connector B-53 from ECM. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 3 (Blue/Red wire) on 26-pin ECM connector B-53. Battery voltage should exist.
7. If battery voltage exists, go to step 9). If battery voltage does not exist, check for defective terminals or connections at fuel pressure solenoid. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
8. If no trouble symptom exists, check wiring harness between fuel pressure solenoid and ECM. If wiring harness is defective, repair wiring harness.
9. Check for defective terminals or connections on 26-pin ECM connector B-53. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

DTC TEST NO. 33 - MANIFOLD DIFFERENTIAL PRESSURE SENSOR

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: defective manifold differential pressure sensor, loose connector, open or shorted manifold differential pressure sensor wiring circuit or defective ECM.

Scheme 69

1. Ensure ignition is off. Disconnect connector from manifold differential pressure sensor. Manifold differential pressure sensor is located on top of intake manifold, near throttle body. (Scheme 69) Manifold differential pressure sensor contains a 3-pin Black connector with Black, Green/Yellow and Light Green/Black wires in the connector. (Scheme 69): Identifying Manifold Differential Pressure Sensor
2. Install Test Harness (MB991348) between manifold differential pressure sensor and the connector. Start engine and allow engine to idle.
3. Using voltmeter, check voltage between ground and test harness terminal No. 1. Voltage should be.8-2.4 volts with engine idling. Quickly increase engine speed and note the voltage. Voltage should increase with engine speed.
4. If voltage is within specification, go to step 11). If voltage is not within specification, go to next step.
5. Shut engine off. Remove test harness. With connector disconnected from manifold differential pressure sensor, turn ignition on. Using voltmeter, check voltage between ground and terminal No. 3 (Green/Yellow wire) on wiring harness side of connector.
6. Voltage should be 4.8-5.2 volts. Turn ignition off. Using ohmmeter, check for continuity between ground and terminal No. 2 (Black wire) on wiring harness side of connector. Continuity should exist. If voltage is within specification and continuity exists, go to step 9). If voltage is not within specification or continuity does not exist, go to next step.
7. Check for defective terminals or connections on 22-pin ECM connector B-56. The ECM is located below instrument panel, just in front of center console.
8. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, check wiring harness between ECM and manifold differential pressure sensor. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.
9. Check for defective terminals or connections on connector for manifold differential pressure sensor. If terminals or connections are defective, repair as necessary. If terminals/connections are okay, check for a trouble symptom. See «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
10. If no trouble symptom exists, check wiring harness between ECM and manifold differential pressure sensor. The ECM is located below instrument panel, just in front of center console. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace manifold differential pressure sensor.
11. Turn ignition off. Reinstall connector on manifold differential pressure sensor. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
12. Start engine and allow engine to idle. Using voltmeter, check voltage between ground and terminal No. 73 (Light Green/Black wire) on 22-pin ECM connector B-56. Voltage should be.8-2.4 volts.
13. If voltage is within specification, go to next step. If voltage is not within specification, check wiring harness between ECM and manifold differential pressure sensor. Repair wiring harness as necessary.
14. Check for defective terminals or connections on 22-pin ECM connector B-56. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

DTC TEST NO. 34 - GENERATOR FR TERMINAL CIRCUIT

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes for DTC are: open on generator FR terminal circuit or defective ECM.

1. When generator field is controlled, the FR terminal delivers an input signal to Engine Control Module (ECM). The ECM uses input signal to determine generator output, and controls idle air control motor according to generator output.
2. Start engine and allow engine to idle. Ensure radiator cooling fan is not operating. Using voltmeter, check voltage between ground and terminal No. 4 (Green wire) on 4-pin Gray connector on the alternator. Check voltage with, and without headlights on.
3. Voltage should be 1.0-1.6 volts with headlights on, and 1.8-2.4 volts with headlights off. If voltage is not within specification, go to next step. If voltage is within specification, replace ECM. The ECM is located below instrument panel, just in front of center console.
4. Turn ignition off. Disconnect 4-pin Gray connector from alternator. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 4 (Green wire) on wiring harness side of connector.
5. Voltage should be 4.8-5.2 volts. If voltage is within specification, go to step 8). If voltage is not within specification, go to next step.
6. Check for defective terminals or connections on 16-pin ECM connector B-54. The ECM is located below instrument panel, just in front of center console. Check for defective terminals or connections on 12-pin Black connector, located near air cleaner and alternator at passenger's side front corner of engine compartment.
7. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check wiring harness between ECM and 4-pin Gray connector at generator. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.
8. Check for defective terminals or connections on 4-pin Gray connector on the alternator. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) .
9. If no trouble symptom exists, check wiring harness between ECM and 4-pin Gray connector at generator. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace generator.

DTC TEST NO. 35 - TRANSAXLE CONTROL SYSTEM

Note. Possible causes for DTC are: defective pulse generator or defective ECM.

When a failure exists in the pulse generators on the transaxle, the Transmission Control Module (TCM) delivers a malfunction signal to the Engine Control Module (ECM). Check TCM and transaxle control system. See the appropriate TRANSAXLE article for transaxle diagnosis.

DTC TEST NO. 36 - SOLENOID ASSEMBLY MALFUNCTION

Note. Possible causes for DTC are: defective torque converter clutch solenoid, defective shift control solenoid, defective pressure control solenoids or defective ECM.

When a failure exists in the torque converter clutch solenoid, shift control solenoid, or pressure control solenoid on the transaxle, the Transmission Control Module (TCM) delivers a malfunction signal to the Engine Control Module (ECM). Check TCM and transaxle control system. See the appropriate TRANSAXLE article for transaxle diagnosis.

TROUBLE SYMPTOM USAGE

1. Check for possible cause by trouble symptom and then perform specified inspection procedure. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) .
2. When performing specified trouble symptom inspection procedures, technician may be instructed to perform scan tool service data inspection on a specified component. Scan tool is used to monitor operation of a specified component under a specified operating condition. Component operation is then compared to a normal operating range to determine if component is operating properly. See procedures under «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
3. Technician may be instructed to perform a specified DTC test. DTC TESTS are listed under «SELF-DIAGNOSTIC TESTS»(ref-11311-S36467877102000111300000) .
4. Technician may be instructed to perform a scan tool actuator test on a specified components. See «SCAN TOOL ACTUATOR TESTS»(ref-11311-S36429429792000111300000) .

TROUBLE SYMPTOM INSPECTION

INSPECTION PROCEDURE 1 - NO SCAN TOOL COMMUNICATION WITH ANY

SYSTEM

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

Note. Possible causes are: defective connector or wiring harness.

Scheme 70

1. Using voltmeter, check voltage between ground and terminal No. 16 (Red/Black wire) on 16-pin data link connector. For data link connector location (Scheme 61) Battery voltage should exist.
2. If battery voltage exists, go to step 4). If battery voltage does not exist, check for defective terminals or connections at connectors B-07, B-50 and B-75. (Scheme 70) (Scheme 70): Identifying Connectors
3. If connector or terminals are defective, repair as necessary. If connectors and terminals are okay, check wiring harness between power supply and data link connector on Red/Black wire. See the WIRING DIAGRAMS article.
4. Using ohmmeter, check for continuity between ground and terminals No. 4 (Black wire) and No. 5 (Black/White wire) on data link connector. Continuity should exist on both wires.
5. If continuity exists, replace scan tool. If continuity does not exist, repair open ground circuit on Black wire or Black/White wire to data link connector.

INSPECTION PROCEDURE 2 - NO SCAN TOOL COMMUNICATION WITH ECM

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes are: defective ECM power supply circuit, open circuit between ECM and data link connector or defective ECM.

1. Check for defective terminals or connections on 12-pin ECM connector B-55. The ECM is located below instrument panel, just in front of center console. Check for defective terminals or connections at connectors B-08 and B-63. (Scheme 70)
2. If connector or terminals are defective, repair as necessary. If connectors and terminals are okay, check wiring harness between data link connector and ECM.
3. If wiring harness is defective, repair as necessary. If wiring harness is okay, check power supply and ignition switch IG system. Perform INSPECTION PROCEDURE 23.

INSPECTION PROCEDURE 3 - MIL FAILS TO ILLUMINATE WHEN

IGNITION IS FIRST TURNED ON

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes are: defective MIL bulb, defective MIL wiring circuit or defective ECM.

1. Using scan tool, perform scan tool service data inspection procedure on power supply voltage for ECM. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000).
2. If battery voltage exists when performing scan tool service data inspection, go to next step. If battery voltage does not exist, check power supply and ignition switch (IG) system. Perform INSPECTION PROCEDURE 23.
3. Ensure ignition is off. Disconnect 16-pin ECM connector B-54 from ECM. The ECM is located below instrument panel, just in front of center console.
4. Using jumper wire, ground terminal No. 36 (Green/Red wire) on 16-pin ECM connector B-54. Turn ignition on. Note if MIL is illuminated.
5. If MIL is not illuminated, go to next step. If MIL is illuminated, check for defective terminals or connections on 16-pin ECM connector B-54. If connector or terminals are defective, repair as necessary. If connectors and terminals are okay, replace ECM.
6. Check for defective MIL bulb. Replace MIL bulb if defective and recheck MIL operation. If MIL bulb is okay, go to next step.
7. Ensure ignition is off. Disconnect connector C-06 at rear of instrument cluster. (Scheme 71) Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 10 (Black/White wire) on connector C-06. Battery voltage should exist.
8. If battery voltage exists, go to next step. If battery voltage does not exist, check power supply on Black/White wire to MIL. See the WIRING DIAGRAMS article.
9. Check for defective terminals or connections at connectors C-04, C-06 and C-22. (Scheme 71)
10. If connector or terminals are defective, repair as necessary. If connector and terminals are okay, check wiring harness between instrument cluster and ECM. Repair wiring harness as necessary.

Identifying Connectors for Procedure 3. Scheme 71

INSPECTION PROCEDURE 4 - MIL REMAINS ILLUMINATED AT ALL TIMES

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes are: shorted MIL wiring circuit between MIL and ECM or defective ECM.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Ensure ignition is off. Disconnect connector C-04 at rear of instrument cluster. (Scheme 71)
3. Disconnect 16-pin ECM connector B-54 from ECM. The ECM is located below instrument panel, just in front of center console.
4. Using ohmmeter, check for continuity between ground and terminal No. 36 (Green/Red wire) on 16-pin ECM connector B-54. Continuity should not exist.
5. If no continuity exists, replace ECM. If continuity exists, check for short to ground on wiring harness between 16-pin ECM connector B-54 and C-04 connector on rear of instrument cluster. Repair wiring harness as necessary.

INSPECTION PROCEDURE 5 - ENGINE CRANKS BUT WILL NOT START

Note. Possible causes are: defective ignition system, defective fuel pump or fuel injection system, contaminated fuel, low compression or defective ECM.

1. Ensure battery voltage is at least 8 volts during cranking. If battery voltage is within specification, go to next step. If battery voltage is not within specification, check battery and charging system.
2. Perform INSPECTION PROCEDURE 32. Once inspection procedure 32 is performed and all components are okay, go to next step.
3. Using stethoscope, check for operating sound at injector while cranking engine. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12.
4. Perform INSPECTION PROCEDURE 33. Once inspection procedure No. 33 is performed and all components are okay, go to next step.
5. Check for defective ignition coil, spark plugs and spark plug wires. Check for clogged injectors, contaminated fuel or low compression. Repair or replace components as necessary.

INSPECTION PROCEDURE 6 - ENGINE STARTS & DIES

Note. Possible causes are: defective ignition system, defective fuel injection system, contaminated fuel, low compression or defective ECM.

1. Ensure battery voltage is at least 8 volts during cranking. If battery voltage is within specification, go to next step. If battery voltage is not within specification, check battery and charging system.
2. Perform INSPECTION PROCEDURE 34. Once inspection procedure No. 34 is performed and all components are okay, go to next step.
3. Using stethoscope, check for operating sound at injector with engine idling, or while cranking engine. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12.
4. If engine starts good when engine is cranked with accelerator slightly depressed, go to next step. If engine does not start good when engine is cranked with accelerator slightly depressed, go to step 8).
5. Ensure engine coolant temperature is less than 68°F (20°C). Turn ignition on. Listen for operating sound at idle air control motor when ignition is turned off. Idle air control motor is mounted on throttle body and contains a 6-pin Black connector.
6. If idle air control motor operating sound is heard, clean throttle body and check adjustment of fixed Speed Adjusting Screw (SAS). See the «ADJUSTMENTS - TURBO»(ref-11270) article.
7. If idle air control motor operating sound is not heard, check idle air control system. Perform DTC TEST NO. 24.
8. Check ignition timing when cranking engine. See «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
9. Check for defective ignition coil, spark plugs and spark plug wires. Check for clogged injectors, restricted fuel lines, contaminated fuel or low compression. Repair or replace components as necessary.

INSPECTION PROCEDURE 7 - ENGINE IS HARD STARTING

Note. Possible causes are: defective ignition system, defective fuel injection system, contaminated fuel or low compression.

1. Ensure battery voltage is at least 8 volts during cranking. If battery voltage is within specification, go to next step. If battery voltage is not within specification, check battery and charging system.
2. Perform INSPECTION PROCEDURE 34 under TROUBLE SYMPTOMS. Once inspection procedure No. 34 is performed and all components are okay, go to next step.
3. Using stethoscope, check for operating sound at injector while cranking engine. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12
4. Check ignition timing when cranking engine. See «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
5. Check for defective ignition coil, spark plugs and spark plug wires. Check for clogged injectors, contaminated fuel or low compression. Repair or replace components as necessary.

INSPECTION PROCEDURE 8 - UNSTABLE ENGINE IDLE SPEED

Note. Possible causes are: defective ignition system, defective idle air control motor system, defective air/fuel ratio control system, defective EVAP system, low compression, excessive air drawn into exhaust system or defective EGR system.

1. Check if battery was previously disconnected. If battery was not disconnected, go to next step. If battery was disconnected, reconnect battery. Start and warm engine to normal operating temperature. Allow engine to idle for at least 10 minutes, and then recheck engine idle.
2. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
3. If engine idle speed does not fluctuate excessively, go to next step. If engine idle speed fluctuates excessively, perform INSPECTION PROCEDURE 35 under TROUBLE SYMPTOMS.
4. Ensure engine coolant temperature is less than 68°F (20°C). Turn ignition on. Listen for operating sound at idle air control motor when ignition is turned off. Idle air control motor is mounted on throttle body and contains a 6-pin Black connector.
5. If idle air control motor operating sound is heard, go to next step. If idle air control motor operating sound is not heard, check idle control system. Perform DTC TEST NO. 24.
6. Using stethoscope, check for operating sound at injector with engine idling. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12
7. Perform INSPECTION PROCEDURE 36. Once inspection procedure No. 36 is performed and all components are okay, go to next step.
8. Check ignition timing. See the «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
9. Using scan tool actuator test, check EGR solenoid. See «SCAN TOOL ACTUATOR TESTS»(ref-11311-S36429429792000111300000) .
10. If EGR solenoid operates correctly when performing scan tool actuator test, go to next step. If EGR solenoid does not operate correctly when performing scan tool actuator test, check EGR solenoid system. Perform DTC TEST NO. 19.
11. Check for defective ignition coil, spark plugs and spark plug wires. Check for defective EVAP purge control system, defective EGR system, contaminated fuel or low compression. Repair or replace components as necessary.

INSPECTION PROCEDURE 9 - ENGINE IDLE SPEED IS TOO HIGH

Note. Possible causes are: defective idle air control motor system or defective throttle body.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Ensure engine coolant temperature is less than 68°F (20°C). Turn ignition on. Listen for operating sound at idle air control motor when ignition is turned off. Idle air control motor is mounted on throttle body and contains a 6-pin Black connector.
3. If idle air control motor operating sound is heard, go to next step. If idle air control motor operating sound is not heard, check idle control system. Perform DTC TEST NO. 24.
4. Perform scan tool service data inspection procedure on closed throttle position switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
5. If closed throttle position switch operates correctly, go to next step. If closed switch does not operate correctly, check closed throttle position switch. Perform DTC TEST NO. 25.
6. Perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
7. If engine coolant temperature sensor operates correctly, go to next step. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.
8. Using scan tool, perform scan tool service data inspection procedure on A/C switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
9. If A/C switch operates correctly, go to next step. If A/C switch does not operate correctly, check A/C switch and A/C clutch relay system. Perform INSPECTION PROCEDURE 28.
10. Adjust engine idle speed. See the «ADJUSTMENTS - TURBO»(ref-11270) article. If engine idle speed still remains too high after attempting to adjust engine idle speed clean throttle body and check adjustment of fixed Speed Adjusting Screw (SAS). See the «ADJUSTMENTS - TURBO»(ref-11270) article.

INSPECTION PROCEDURE 10 - ENGINE IDLE SPEED IS TOO LOW

Note. Possible causes are: defective idle air control motor system or defective throttle body.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Ensure engine coolant temperature is less than 68°F (20°C). Turn ignition on. Listen for operating sound at idle air control motor when ignition is turned off. Idle air control motor is mounted on throttle body and contains a 6-pin Black connector.
3. If idle air control motor operating sound is heard, go to next step. If idle air control motor operating sound is not heard, check idle control system. Perform DTC TEST NO. 24.
4. Perform scan tool service data inspection procedure on closed throttle position switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
5. If closed throttle position switch operates correctly, go to next step. If closed switch does not operate correctly, check closed throttle position switch. Perform DTC TEST NO. 25.
6. Perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
7. If engine coolant temperature sensor operates correctly, go to next step. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.
8. Perform scan tool service data inspection procedure on park/neutral switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
9. If park/neutral switch operates correctly, go to next step. If park/neutral switch does not operate correctly, check ignition switch (ST) and park/neutral switch system. Perform INSPECTION PROCEDURE 26.
10. Adjust engine idle speed. See the «ADJUSTMENTS - TURBO»(ref-11270) article. If engine idle speed still remains too low after attempting to adjust engine idle speed, clean throttle body and check adjustment of fixed Speed Adjusting Screw (SAS). See the «ADJUSTMENTS - TURBO»(ref-11270) article.

INSPECTION PROCEDURE 11 - ENGINE STALLS AT IDLE WHEN ENGINE

IS COLD

Note. Possible causes are: defective idle air control motor system, defective throttle body, defective fuel injection system or defective ignition system.

1. Check if battery was previously disconnected. If battery was not disconnected, go to next step. If battery was disconnected, reconnect battery. Start and warm engine to normal operating temperature. Allow engine to idle for at least 10 minutes, and then recheck engine idle.
2. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
3. If engine does not stall right after accelerator pedal is released, go to next step. If engine stalls right after accelerator pedal is released, clean throttle body and check adjustment of fixed Speed Adjusting Screw (SAS). See the «ADJUSTMENTS - TURBO»(ref-11270) article.
4. If engine idle is stable after engine warm-up, go to next step. If engine idle is not stable after engine warm-up, perform INSPECTION PROCEDURE 8.
5. Ensure engine coolant temperature is less than 68°F (20°C). Turn ignition on. Listen for operating sound at idle air control motor when ignition is turned off. Idle air control motor is mounted on throttle body and contains a 6-pin Black connector.
6. If idle air control motor operating sound is heard, go to next step. If idle air control motor operating sound is not heard, check idle control system. Perform DTC TEST NO. 24.
7. Using stethoscope, check for operating sound at injector with engine idling. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12.
8. Perform scan tool service data inspection procedure on closed throttle position switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
9. If closed throttle position switch operates correctly, go to next step. If closed switch does not operate correctly, check closed throttle position switch system. Perform DTC TEST NO. 25.
10. Using scan tool, perform scan tool service data inspection procedure on engine coolant temperature sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
11. If engine coolant temperature sensor operates correctly, go to next step. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.
12. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
13. Check ignition timing. See the «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
14. Check for defective ignition coil, spark plugs and spark plug wires. Check for low compression and improper oil viscosity. Repair or replace components as necessary.

INSPECTION PROCEDURE 12 - ENGINE STALLS AT IDLE WHEN ENGINE

IS WARM

Note. Possible causes are: defective ignition system, defective air/fuel ratio control system, defective idle air control motor system or vacuum leaks.

1. Check if battery was previously disconnected. If battery was not disconnected, go to next step. If battery was disconnected, reconnect battery. Start and warm engine to normal operating temperature. Allow engine to idle for at least 10 minutes, and then recheck engine idle.
2. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
3. Ensure engine coolant temperature is less than 68°F (20°C). Turn ignition on. Listen for operating sound at idle air control motor when ignition is turned off. Idle air control motor is mounted on throttle body and contains a 6-pin Black connector.
4. If idle air control motor operating sound is heard, go to next step. If idle air control motor operating sound is not heard, check idle control system. Perform DTC TEST NO. 24.
5. Using stethoscope, check for operating sound at injector with engine idling. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12.
6. If engine does not stall right after accelerator pedal is released, go to next step. If engine stalls right after accelerator pedal is released, clean throttle body and check adjustment of fixed Speed Adjusting Screw (SAS). See the «ADJUSTMENTS - TURBO»(ref-11270) article.
7. If engine stalls easily again, go to next step. If engine does not stall easily again, problem is intermittent. Check for sudden changes in the following signals or voltages: crankshaft position sensor signal, volume airflow sensor signal, injector driver signal, primary and secondary ignition signal, fuel pump drive signal and ECM power supply voltage. Repair intermittent problem.
8. Perform INSPECTION PROCEDURE 37. Once inspection procedure No. 37 is performed and all components are okay, go to next step.
9. Check ignition timing. See the «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
10. Check for defective ignition coil, spark plugs and spark plug wires. Check for clogged injectors, low compression and contaminated fuel. Repair or replace components as necessary.

INSPECTION PROCEDURE 13 - ENGINE STALLS WHEN ACCELERATING

Note. Possible causes are: defective ignition system or vacuum leaks.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Check for defective ignition coil, spark plugs and spark plug wires. Check for vacuum leak which may cause an improper air/fuel ratio. Check for broken air intake hose.

INSPECTION PROCEDURE 14 - ENGINE STALLS WHEN DECELERATING

Note. Possible causes are: defective idle air control motor system.

1. Check if battery was previously disconnected. If battery was not disconnected, go to next step. If battery was disconnected, reconnect battery. Start and warm engine to normal operating temperature. Allow engine to idle for at least 10 minutes, and then recheck for trouble symptom.
2. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
3. Perform scan tool service data inspection procedure on closed throttle position switch. See SCAN TOOL SERVICE DATA INSPECTION PROCEDURE.
4. If closed throttle position switch operates correctly, go to next step. If closed throttle position switch does not operate correctly, check closed throttle position switch system. Perform DTC TEST NO. 25.
5. Perform scan tool service data inspection procedure on throttle position sensor. See SCAN TOOL SERVICE DATA INSPECTION PROCEDURE.
6. If throttle position sensor operates correctly, go to next step. If throttle position sensor does not operate correctly, check throttle position sensor circuit. Perform DTC TEST NO. 5.
7. Using scan tool, perform scan tool service data inspection procedure on idle air control motor. If idle air control motor position does not drop to 0-2 steps when decelerating with engine RPM less than 1000 RPM, go to next step. If idle air control motor position drops to 0-2 steps when decelerating with engine RPM less than 1000 RPM, check for vehicle speed sensor malfunction. Perform DTC TEST NO. 23.
8. Check for defective ignition coil, spark plugs and spark plug wires. Clean throttle body and check adjustment of fixed Speed Adjusting Screw (SAS). See the «ADJUSTMENTS - TURBO»(ref-11270) article.

INSPECTION PROCEDURE 15 - ENGINE HESITATES OR STUMBLES

Note. Possible causes are: defective ignition system, defective air/fuel ratio control system, defective fuel supply system, defective EGR system, low compression or defective turbocharger system.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Using stethoscope, check for operating sound at injector while cranking engine. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12
3. Check ignition timing. See the «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
4. Perform INSPECTION PROCEDURE 38. Once inspection procedure No. 38 is performed and all components are okay, go to next step.
5. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
6. Check for defective ignition coil, spark plugs and spark plug wires. Check for defective EGR system, low compression and restricted fuel filter.
7. Check turbocharger pressure and intake charge pressure control system. See the SYSTEM/COMPONENT TESTS article.

INSPECTION PROCEDURE 16 - ENGINE VIBRATES WHEN ACCELERATING

Note. Possible causes are: defective ignition system.

Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, check for defective ignition coil, spark plugs and spark plug wires. Repair ignition system as necessary.

INSPECTION PROCEDURE 17 - ENGINE VIBRATES WHEN DECELERATING

Note. Possible causes are: defective idle air control motor system.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Ensure engine coolant temperature is less than 68°F (20°C). Turn ignition on. Listen for operating sound at idle air control motor when ignition is turned off. Idle air control motor is mounted on throttle body and contains a 6-pin Black connector.
3. If idle air control motor operating sound is heard, go to next step. If idle air control motor operating sound is not heard, check idle control system. Perform DTC TEST NO. 24.
4. Perform scan tool service data inspection procedure on throttle position sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
5. If throttle position sensor operates correctly, go to next step. If throttle position sensor does not operate correctly, check throttle position sensor circuit. Perform DTC TEST NO. 5.
6. Perform scan tool service data inspection procedure on closed throttle position switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
7. If closed throttle position switch does not operate correctly, check switch. Perform DTC TEST NO. 25. If closed throttle position switch operates correctly, clean throttle body. See the «ADJUSTMENTS - TURBO»(ref-11270) article.

INSPECTION PROCEDURE 18 - ENGINE HAS POOR ACCELERATION

Note. Possible causes are: defective ignition system, defective air/fuel ratio control system, defective fuel supply system, defective turbocharger system or restricted exhaust system.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Using stethoscope, check for operating sound at injector with engine idling. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12
3. Check ignition timing. See the «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
4. Perform INSPECTION PROCEDURE 38. Once inspection procedure No. 38 is performed and all components are okay, go to next step.
5. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
6. Check for defective ignition coil, spark plugs and spark plug wires. Check for restricted air filter, fuel filter, fuel lines and exhaust system. Check for low compression and broken air intake hose.
7. Check turbocharger pressure and intake charge pressure control system. See the SYSTEM/COMPONENT TESTS article.

INSPECTION PROCEDURE 19 - ENGINE SURGES

Note. Possible causes are: defective ignition system, defective air/fuel ratio control system or defective EGR system.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Using stethoscope, check for operating sound at injector with engine idling. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12.
3. Check ignition timing. See the «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
4. Perform INSPECTION PROCEDURE 39. Once inspection procedure No. 39 is performed and all components are okay, go to next step.
5. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
6. Check for defective ignition coil, spark plugs and spark plug wires. Check for defective EGR system.
7. Check for defective turbocharger wastegate actuator. See the SYSTEM/COMPONENT TESTS article.

INSPECTION PROCEDURE 20 - ENGINE KNOCKS

Note. Possible causes are: defective knock sensor, improper heat range spark plug or contaminated fuel.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Using scan tool, check ignition timing. Ensure ignition is off. Disconnect connector from knock sensor. Knock sensor is located on side of cylinder block, just below intake manifold. Knock sensor contains a 2-pin Gray connector with White and Black/White wires in connector.
3. Using scan tool, check that ignition timing is now retarded with knock sensor disconnected. Road test vehicle and note if knock still exists.
4. If knock still exists with knock sensor disconnected, go to next step. If knock does not exist with knock sensor disconnected, check knock sensor circuit. Perform DTC TEST NO. 15.
5. Check for proper heat range spark plug. Check for contaminated fuel.

INSPECTION PROCEDURE 21 - ENGINE DIESELS

Note. Possible causes are: leaking injectors.

Check for leaking injector(s). Replace injector if leakage exists.

INSPECTION PROCEDURE 22 - ENGINE HAS HIGH CO & HC WHEN IDLING

Note. Possible causes are: defective air/fuel ratio control system or defective catalytic converter.

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Check ignition timing. See the «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
3. Perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
4. If engine coolant temperature sensor operates correctly, go to next step. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.
5. Perform scan tool service data inspection procedure on intake air temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
6. If intake air temperature sensor operates correctly, go to next step. If intake air temperature sensor does not operate correctly, check intake air temperature sensor circuit. Perform DTC TEST NO. 3.
7. Perform scan tool service data inspection procedure on barometric pressure sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
8. If barometric pressure sensor operates correctly, go to next step. If barometric pressure sensor does not operate correctly, check barometric pressure sensor circuit. Perform DTC TEST NO. 2.
9. Using scan tool, perform scan tool service data inspection procedure on rear oxygen sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
10. If rear oxygen sensor operates correctly, go to next step. If rear oxygen sensor does not operate correctly, check rear oxygen sensor circuit. Perform DTC TEST NO. 9.
11. Using scan tool, perform scan tool service data inspection procedure on front oxygen sensor when suddenly increasing engine RPM. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
12. If front oxygen sensor operates correctly, go to next step. If front oxygen sensor does not operate correctly, check front oxygen sensor system. Perform INSPECTION PROCEDURE 30.
13. Perform scan tool service data inspection procedure on front oxygen sensor with engine idling and then increasing engine RPM to 2500 RPM. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
14. If front oxygen sensor operates correctly, go to next step. If front oxygen sensor does not operate correctly, replace front oxygen sensor. Recheck for trouble symptom. If trouble symptom still exists, go to step 16).
15. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
16. Check for defective injector operation and leaking injectors. Check for defective ignition coil, spark plugs and spark plug wires. Check for low compression. Check for defective EGR, PCV and EVAP systems. If all systems are okay, but trouble symptom still exists, replace catalytic converter.

INSPECTION PROCEDURE 23 - POWER SUPPLY & IGNITION SWITCH

IG SYSTEM

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

Note. Possible causes are: defective ignition switch or MFI relay, loose connector, open or shorted MFI relay wiring circuit, defective ECM ground circuit or defective ECM.

1. Check MFI relay. See the SYSTEM/COMPONENT TESTS article. Replace MFI relay if defective. If MFI relay is okay, go to next step.
2. Disconnect connector at MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. see scheme 16 see scheme 16: Identifying MFI & Fuel Pump Relays
3. Using voltmeter, check voltage between ground and terminals No. 3 (Red/Black wire) and No. 4 (Red/Black wires) on wiring harness side of connector. Go to next step.
4. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between battery and MFI relay. Repair wiring harness if defective.
5. Check ECM power supply and ground circuits. Perform INSPECTION PROCEDURE 40.

INSPECTION PROCEDURE 25 - IGN SWITCH START (ST) SYSTEM (M/T)

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes are: defective ignition switch, loose connector, open or shorted ignition switch wiring circuit or defective ECM.

Scheme 72

1. Ensure ignition is off. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
2. Disconnect 22-pin ECM connector B-56 from ECM. Using voltmeter, check voltage between ground and terminal No. 71 (Black/Yellow wire) on 22-pin ECM connector B-56 with ignition switch in START position.
3. Voltage should be at least 8 volts. If voltage is within specification, go to step 7). If voltage is not within specification, go to next step.
4. Check for defective terminals or connections at starter relay. Starter relay is located near center console. (Scheme 72) Check for defective terminals or connections at connector B-63. (Scheme 70) (Scheme 72): Identifying Starter Relay
5. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
6. If no trouble symptom exists, check wiring harness between ECM and ignition switch. If wiring harness is defective, repair wiring harness. If wiring harness is okay, check ignition switch.
7. Using ohmmeter, check for continuity between ground and terminal No. 91 (Black/Red wire) on 22-pin ECM connector B-56. Continuity should exist.
8. If continuity exists, go to next step. If no continuity exists, check for defective wiring harness between ECM and ground circuit on Black/Red wire. Repair wiring harness as necessary.
9. Check for defective terminals or connections at 22-pin ECM connector B-56. If defective terminals or connections exist, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

INSPECTION PROCEDURE 26 - IGNITION SWITCH START (ST) &

PARK/NEUTRAL SWITCH SYSTEM (A/T)

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes are: defective ignition switch, defective park/neutral switch, loose connector, open or shorted ignition switch or park/neutral switch wiring circuit or defective ECM.

1. Check park/neutral switch. See procedures in SYSTEM/COMPONENT TESTS article. If park/neutral switch is okay, go to next step. Replace park/neutral switch if defective and recheck operation.
2. Disconnect connector from park/neutral switch. Park/neutral switch is located on top of transaxle, near shift control cable and contains a 12-pin Black connector.
3. Using voltmeter, check voltage between ground and terminal No. 8 (Black/Red wire) on wiring harness side of connector with ignition in START position. Battery voltage should exist.
4. If battery voltage exists, go to step 8). If battery voltage does not exist, go to next step.
5. Check for defective terminals or connections at 22-pin ECM connector B-56 and starter relay. The ECM is located below instrument panel, just in front of center console. Starter relay is located near center console. (Scheme 72)
6. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
7. If no trouble symptom exists, check wiring harness between ECM and park/neutral switch. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.
8. Using ohmmeter, check for continuity between ground and terminal No. 7 (Black wire) on wiring harness side of connector. Continuity should exist.
9. If continuity exists, go to next step. If no continuity exists, check for defective ground circuit on Black wire. Repair wiring as necessary.
10. Ensure ignition is off. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console. Disconnect 22-pin ECM connector B-56 from ECM.
11. Using voltmeter, check voltage between ground and terminal No. 8 (Black/Red wire) on wiring harness side of connector with ignition switch in START position. Battery voltage should exist.
12. If battery voltage exists, go to step 16). If battery voltage does not exist, go to next step.
13. Check for defective terminals or connections at starter relay. Starter relay is located near center console. (Scheme 72)in INSPECTION PROCEDURE 25. Check for defective terminals or connections at connector B-63. (Scheme 70)
14. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
15. If no trouble symptom exists, check wiring harness between park/neutral switch and ignition switch. If wiring harness is defective, repair wiring harness. If wiring harness is okay, check ignition switch.
16. Check for defective terminals or connections at starter relay and 22-pin ECM connector B-56. Starter relay is located near center console. (Scheme 72) Check for defective terminals or connections at connector B-63. (Scheme 70)
17. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
18. If no trouble symptom exists, check wiring harness between park/neutral switch and ECM. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.

INSPECTION PROCEDURE 27 - POWER STEERING PRESSURE SWITCH

SYSTEM

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes are: defective power steering pressure switch, loose connector, open or shorted power steering pressure switch wiring circuit or defective ECM.

Scheme 73

1. Check power steering pressure switch. See procedures in the SYSTEM/COMPONENT TESTS article. If power steering pressure switch is okay, go to next step. Replace power steering pressure switch if defective and recheck operation.
2. Disconnect connector from power steering pressure switch. Power steering pressure switch is located on top of power steering pump and contains a 1-pin connector.
3. Using voltmeter, check voltage between ground and Blue/White wire on wiring harness side of connector with ignition on. Battery voltage should exist.
4. If battery voltage exists, go to step 8). If battery voltage does not exist, go to next step.
5. Check for defective terminals or connections at 16-pin ECM connector B-54, and connector A-32. The ECM is located below instrument panel, just in front of center console. Connector A-32 is a 12-pin Black connector, located in at passenger's side front corner of engine compartment. (Scheme 73) (Scheme 73): Identifying Connector
6. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
7. If no trouble symptom exists, check wiring harness between ECM and power steering pressure switch. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.
8. Check for defective terminals or connections at power steering pressure switch and connector. If terminals or connections are defective, repair as necessary. If terminals/connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

INSPECTION PROCEDURE 28 - A/C SWITCH & A/C CLUTCH RELAY

SYSTEM

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes are: defective A/C control system or A/C switch, loose connector, open or shorted A/C switch or A/C clutch relay wiring circuit or defective ECM.

1. Check A/C clutch relay. See the SYSTEM/COMPONENT TESTS article. If A/C clutch relay is okay, go to next step. Replace A/C clutch relay if defective and recheck operation.
2. Ensure ignition is off. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
3. Disconnect 26-pin ECM connector B-53 and 16-pin ECM connector B-54 from ECM. Turn ignition and A/C switches to ON position.
4. Using voltmeter, check voltage between ground and terminals No. 22 (Green wire) on 26-pin ECM connector B-53, and No. 45 (Green/Red wire) on 16-pin ECM connector B-54. Battery voltage should exist on both wires.
5. Using jumper wire, ground terminal No. 22 (Green wire) on 26-pin ECM connector B-53 with ignition and A/C switches still in the ON position. The A/C compressor clutch should engage.
6. If battery voltage exists as specified and A/C compressor clutch engages, go to next step. If battery voltage does not exist as specified, or A/C compressor clutch does not engage, check A/C system. See appropriate AIR CONDITIONING & HEAT article.
7. Check for defective terminals/connections on 26-pin ECM connector B-53 and 16-pin ECM connector B-54. If terminals/connections are defective, repair as necessary. If terminals/connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, replace ECM.

INSPECTION PROCEDURE 29 - RADIATOR & A/C CONDENSER COOLING

FAN OPERATION

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes are: defective cooling fan motor relay or cooling fan motor, loose connector, open or shorted cooling fan wiring circuit, or defective ECM.

1. Ensure ignition is off. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
2. Disconnect 26-pin ECM connector B-53 from ECM. Turn ignition on.
3. Using voltmeter, check voltage between ground and terminals No. 20 (Green/Orange wire) and No. 21 (Green/Black wire) on 26-pin ECM connector B-53. Battery voltage should exist on both wires.
4. Using jumper wire, ground terminal No. 20 (Green/Orange wire) on 26-pin ECM connector B-53 with ignition on. Radiator cooling fan and A/C condenser cooling fan should operate on high speed. Remove jumper wire.
5. Using jumper wire, ground terminal No. 21 (Green/Black wire) on 26-pin ECM connector B-53 with ignition on. Radiator cooling fan and A/C condenser cooling fan should operate on low speed.
6. If battery voltage exists, and both fans operate correctly, go to next step. If battery voltage does not exist, or both fans do not operate correctly, check wiring circuit for cooling fans.
7. Check for defective terminals or connections on 26-pin ECM connector B-53. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, replace ECM.

INSPECTION PROCEDURE 30 - FRONT OXYGEN SENSOR SYSTEM

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

Note. Possible causes are: defective front oxygen sensor, loose connector, open or shorted oxygen sensor wiring circuit or defective ECM.

1. Check front oxygen sensor. Front oxygen sensor is mounted on outlet elbow on turbocharger, near exhaust pipe. See procedures in the SYSTEM/COMPONENT TESTS article. If front oxygen sensor is okay, go to next step. Replace front oxygen sensor if defective and recheck operation.
2. Disconnect connector at front oxygen sensor. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 1 (Red wire) on wiring harness side of connector. Battery voltage should exist.
3. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between front oxygen sensor and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. see scheme 16 Repair wiring harness as necessary. NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
4. Reinstall connector on front oxygen sensor. Turn ignition off. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
5. Disconnect 12-pin ECM connector B-55 from ECM. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 60 (Yellow wire) on 12-pin ECM connector B-55. Battery voltage should exist.
6. If battery voltage exists, go to step 9). If battery voltage does not exist, go to next step.
7. Check for defective terminals or connections at connector front oxygen sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
8. If no trouble symptom exists, check wiring harness between ECM and front oxygen sensor. Repair wiring harness if necessary.
9. Check for defective terminals or connections at 12-pin ECM connector B-55. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

INSPECTION PROCEDURE 31 - IGNITION SYSTEM CIRCUIT

Note. For wiring diagram, see WIRING DIAGRAMS article.

Note. Possible causes are: defective ignition switch or ignition power transistor, loose connector, open or shorted ignition switch or ignition power transistor wiring circuit, or defective ECM.

1. Disconnect connector at ignition coil. Ignition coil is located on top of engine, between valve covers and contains a 3-pin connector. Turn ignition on.
2. Using voltmeter, check voltage between ground and terminal No. 3 (Black/White wire) on wiring harness side of connector. Battery voltage should exist.
3. If battery voltage exists, go to step 5). If battery voltage does not exist, check for defective terminals on connector. If terminals are defective, repair as necessary. If terminals are okay, go to next step.
4. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check wiring harness between ignition coil and ignition switch. Repair wiring harness if defective. If wiring harness is okay, check ignition switch.
5. Ensure ignition is off. Disconnect connector at ignition power transistor. Ignition power transistor is mounted on top of engine, near ignition coil and contains an 8-pin Black connector.
6. Using ohmmeter, check for continuity between ground and terminal No. 3 (Black wire) on wiring harness side of connector. Continuity should exist.
7. If continuity exists, go to next step. If no continuity exists, check for defective ground circuit on Black wire. Repair wiring as necessary.
8. Check for defective terminals or connections at ignition coil and ignition power transistor connectors. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, go to next step.
9. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check ignition coil. See the «BASIC TESTING - TURBO»(ref-11296) article.
10. Replace ignition coil if defective. If ignition coil is okay, check ignition power transistor. See «BASIC TESTING - TURBO»(ref-11296) article.
11. Replace ignition power transistor if defective. If ignition power transistor is okay, go to next step.
12. Reinstall connector on ignition coil. Turn ignition on. Using voltmeter, check voltage between ground and terminals No. 1 (Blue/Black wire) and No. 8 (Black/White wire) at end of connector on wiring harness side of connector for ignition power transistor. NOTE: When checking voltage at terminal No. 8 (Black/White wire) on connector for ignition power transistor, terminal No. 8 is the end terminal on the connector. DO NOT use Black/White wire at terminal No. 6, closer to the center of the connector.
13. Battery voltage should exist. If battery voltage exists, go to step 16). If battery voltage does not exist, check for defective terminals or connections on ignition coil connector.
14. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, go to next step.
15. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check wiring harness between ignition coil and ignition power transistor. Repair wiring harness if defective.
16. Using voltmeter, check voltage between ground and terminals No. 2 (Brown/Red wire) and No. 7 (Black/Blue wire) at wiring harness side of connector for ignition power transistor while cranking engine.
17. Voltage should be .5-4.0 volts. If voltage is within specification, go to step 21). If voltage is not within specification, go to next step.
18. Check for defective terminals or connections on 26-pin ECM connector B-53. The ECM is located below instrument panel, just in front of center console.
19. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, go to next step.
20. Check wiring harness between ECM and ignition power transistor. Repair wiring harness if defective. If wiring harness is okay, replace ECM.
21. Check for defective terminals or connections on connector for ignition power transistor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check ignition signal circuit. Perform INSPECTION PROCEDURE 46.

INSPECTION PROCEDURE 32 - SCAN TOOL INSPECTION PROCEDURE WHEN

ENGINE WILL NOT START

1. Perform scan tool service data inspection procedure on power supply voltage for ECM. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
2. If battery voltage exists, go to next step. If battery voltage does not exist, check power supply and ignition switch IG system. Perform INSPECTION PROCEDURE 23.
3. Remove oil filler cap from valve cover. Check that camshaft rotates while cranking engine. If camshaft rotates, go to next step. If camshaft does not rotate, check for broken timing belt. Repair as necessary.
4. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
5. Using scan tool, perform scan tool service data inspection on crankshaft position sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
6. If cranking speed is displayed, go to next step. If cranking speed is not displayed, check crankshaft position sensor circuit. Perform DTC TEST NO. 16.
7. Using scan tool actuator test, check fuel pump. See «SCAN TOOL ACTUATOR TESTS»(ref-11311-S36429429792000111300000) .
8. If fuel pump operates correctly when performing scan tool actuator test, go to next step. If fuel pump does not operate correctly when performing scan tool actuator test, check fuel pump system operation. Perform INSPECTION PROCEDURE 24.
9. Perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
10. If engine coolant temperature sensor operates correctly, inspection procedure is complete. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.

INSPECTION PROCEDURE 33 - IGN SYSTEM INSPECTION PROCEDURE

WHEN ENGINE WILL NOT START

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

1. Disconnect connector at ignition coil. Ignition coil is located on top of engine, between valve covers and contains a 3-pin connector.
2. Install Test Harness (MD998478) between ignition coil and the connector. Connect tachometer to terminals No. 1 (Red clip) and No. 2 (Black clip) on test harness. Crank engine and note display on tachometer.
3. Tachometer should display an engine speed that is 1/2 of the cranking speed. If tachometer display is correct, go to next step. If tachometer display is not correct, check ignition system circuit. Perform INSPECTION PROCEDURE 31.
4. Check ignition timing when cranking engine. See «ADJUSTMENTS - TURBO»(ref-11270) article. If ignition timing is within specification, inspection procedure is complete. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.

INSPECTION PROCEDURE 34 - SCAN TOOL INSPECTION PROCEDURE WHEN

INCOMPLETE COMBUSTION OCCURS

1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
2. Using scan tool actuator test, check fuel pump. See «SCAN TOOL ACTUATOR TESTS»(ref-11311-S36429429792000111300000) .
3. If fuel pump operates correctly when performing scan tool actuator test, go to next step. If fuel pump does not operate correctly when performing scan tool actuator test, check fuel pump system operation. Perform INSPECTION PROCEDURE 24.
4. Perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
5. If engine coolant temperature sensor operates correctly, go to next step. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.
6. Using scan tool, perform scan tool service data inspection procedure on cranking signal (ignition switch start ST circuit). See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
7. If correct cranking signal is obtained from ignition switch, inspection procedure is complete. If correct cranking signal is not obtained from ignition switch, check ignition switch start (ST) system. Perform INSPECTION PROCEDURE 25 (M/T models) or perform INSPECTION PROCEDURE 26 (A/T models).

INSPECTION PROCEDURE 35 - WHEN HUNTING OCCURS

1. Clean throttle body and check adjustment of fixed Speed Adjusting Screw (SAS). See the «ADJUSTMENTS - TURBO»(ref-11270) article.
2. Recheck for trouble symptom. If trouble symptom still exists, check for defective intake manifold gasket, broken air intake tube or vacuum hose or defective PCV valve.

INSPECTION PROCEDURE 36 - WHEN ENGINE IDLE SPEED IS UNSTABLE

1. Perform scan tool service data inspection procedure on closed throttle position switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
2. If closed throttle position switch operates correctly, go to next step. If closed throttle position switch does not operate correctly, check closed throttle position switch circuit. Perform DTC TEST NO. 25.
3. Perform scan tool service data inspection procedure on intake air temperature sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
4. If intake air temperature sensor operates correctly, go to next step. If intake air temperature sensor does not operate correctly, check intake air temperature sensor circuit. Perform DTC TEST NO. 3
5. Perform scan tool service data inspection procedure on barometric pressure sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
6. If barometric pressure sensor operates correctly, go to next step. If barometric pressure sensor does not operate correctly, check barometric pressure sensor circuit. Perform DTC TEST NO. 2.
7. Perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
8. If engine coolant temperature sensor operates correctly, go to next step. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.
9. Using scan tool actuator test, check EVAP purge solenoid. See «SCAN TOOL ACTUATOR TESTS»(ref-11311-S36429429792000111300000) .
10. If EVAP purge solenoid operates correctly when performing scan tool actuator test, go to next step. If EVAP purge solenoid does not operate correctly when performing scan tool actuator test, check EVAP purge solenoid circuit. Perform DTC TEST NO. 22.
11. Perform scan tool service data inspection procedure on rear oxygen sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
12. If rear oxygen sensor operates correctly, go to next step. If rear oxygen sensor does not operate correctly, check rear oxygen sensor circuit. Perform DTC TEST NO. 9.
13. Using scan tool, perform scan tool service data inspection procedure on front oxygen sensor when engine is suddenly accelerated. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
14. If front oxygen sensor operates within 600-1000 millivolts during sudden acceleration, go to next step. If front oxygen sensor does not operate within 600-1000 millivolts during sudden acceleration, check front oxygen sensor system. Perform INSPECTION PROCEDURE 30 under TROUBLE SYMPTOMS.
15. Using scan tool, perform scan tool service data inspection procedure on front oxygen sensor with engine idling and at 2500 RPM. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
16. If front oxygen sensor operates correctly with engine idling and at 2500 RPM, go to step 19). If front oxygen sensor does not operate correctly with engine idling and at 2500 RPM, go to next step.
17. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
18. Check for defective intake manifold gasket, broken air intake tube, defective vacuum hose or PCV valve. If these components are okay, check for clogged injector(s).
19. Using scan tool, perform scan tool service data inspection procedure on power steering pressure switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
20. If power steering pressure switch operates correctly, go to next step. If power steering pressure switch does not operate correctly, check power steering pressure switch system. Perform INSPECTION PROCEDURE 27.
21. Perform scan tool service data inspection procedure on A/C switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
22. If A/C switch operates correctly, go to next step. If A/C switch does not operate correctly, check A/C switch and A/C clutch relay system. Perform INSPECTION PROCEDURE 28 under TROUBLE SYMPTOMS.
23. Perform scan tool service data inspection procedure on park/neutral switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
24. If park/neutral switch operates correctly, go to next step. If park/neutral switch does not operate correctly, check park/neutral switch system. Perform INSPECTION PROCEDURE 26.
25. Perform scan tool service data inspection procedure on idle air control motor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
26. If idle air control motor operates correctly, inspection procedure is complete. If idle air control motor does not operate correctly, adjust base idle speed. See the «ADJUSTMENTS - TURBO»(ref-11270) article.

INSPECTION PROCEDURE 37 - ENGINE STALLS WHEN WARM & IDLING

1. Perform scan tool service data inspection procedure on closed throttle position switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
2. If closed throttle position switch operates correctly, go to next step. If closed switch does not operate correctly, check closed throttle position switch circuit. Perform DTC TEST NO. 25.
3. Perform scan tool service data inspection procedure on intake air temperature sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
4. If intake air temperature sensor operates correctly, go to next step. If intake air temp sensor does not operate correctly, check intake air temperature sensor circuit. Perform DTC TEST NO. 3.
5. Perform scan tool service data inspection procedure on barometric pressure sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
6. If barometric pressure sensor operates correctly, go to next step. If barometric pressure sensor does not operate correctly, check barometric pressure sensor circuit. Perform DTC TEST NO. 2.
7. Perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
8. If engine coolant temperature sensor operates correctly, go to next step. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.
9. Using scan tool, perform SCAN TOOL SERVICE DATA INSPECTION PROCEDURE on rear oxygen sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
10. If rear oxygen sensor operates correctly, go to next step. If rear oxygen sensor does not operate correctly, check rear oxygen sensor circuit. Perform DTC TEST NO. 9.
11. Using scan tool, perform scan tool service data inspection procedure on front oxygen sensor when engine is suddenly accelerated. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
12. If front oxygen sensor operates within 600-1000 millivolts when during sudden acceleration, go to next step. If front oxygen sensor does not operate within 600-1000 millivolts during sudden acceleration, check front oxygen sensor system. Perform INSPECTION PROCEDURE 30.
13. Using scan tool, perform scan tool service data inspection procedure on front oxygen sensor with engine idling and at 2500 RPM. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
14. If front oxygen sensor operates correctly with engine idling and at 2500 RPM, go to step 17). If front oxygen sensor does not operate correctly with engine idling and at 2500 RPM, go to next step.
15. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
16. Check for defective intake manifold gasket, broken air intake tube or vacuum hose, or defective PCV valve. If these components are okay, check for clogged injector(s).
17. Using scan tool, perform scan tool service data inspection procedure on power steering pressure switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
18. If power steering pressure switch operates correctly, go to next step. If power steering pressure switch does not operate correctly, check power steering pressure switch system. Perform INSPECTION PROCEDURE 27.
19. Perform scan tool service data inspection procedure on A/C switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
20. If A/C switch operates correctly, go to next step. If A/C switch does not operate correctly, check A/C switch and A/C clutch relay system. Perform INSPECTION PROCEDURE 28.
21. Perform scan tool service data inspection procedure on park/neutral switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
22. If park/neutral switch operates correctly, go to next step. If park/neutral switch does not operate correctly, check park/neutral switch system. Perform INSPECTION PROCEDURE 26.
23. Perform scan tool service data inspection procedure on idle air control motor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
24. If idle air control motor operates correctly, inspection procedure is complete. If idle air control motor does not operate correctly, adjust base idle speed. See the «ADJUSTMENTS - TURBO»(ref-11270) article.

INSPECTION PROCEDURE 38 - WHEN ENGINE HESITATES, STUMBLES OR

POOR ACCELERATION OCCURS

1. Perform scan tool service data inspection procedure on closed throttle position switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
2. If closed throttle position switch operates correctly, go to next step. If closed throttle position switch does not operate correctly, check closed throttle position switch circuit. Perform DTC TEST NO. 25.
3. Perform scan tool service data inspection procedure on intake air temperature sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
4. If intake air temperature sensor operates correctly, go to next step. If intake air temp sensor does not operate correctly, check intake air temp sensor circuit. Perform DTC TEST NO. 3.
5. Perform scan tool service data inspection procedure on barometric pressure sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
6. If barometric pressure sensor operates correctly, go to next step. If barometric pressure sensor does not operate correctly, check barometric pressure sensor circuit. Perform DTC TEST NO. 2.
7. Perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
8. If engine coolant temperature sensor operates correctly, go to next step. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.
9. Perform scan tool service data inspection procedure on throttle position sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
10. If throttle position sensor operates correctly, go to next step. If throttle position sensor does not operate correctly, check throttle position sensor circuit. Perform DTC TEST NO. 5.
11. Using scan tool actuator test, check EGR solenoid. See «SCAN TOOL ACTUATOR TESTS»(ref-11311-S36429429792000111300000) after SCAN TOOL SERVICE DATA INSPECTION PROCEDURE.
12. If EGR solenoid operates correctly, go to next step. If EGR solenoid does not operate correctly, check EGR solenoid circuit. Perform DTC TEST NO. 19.
13. Perform scan tool service data inspection procedure on rear oxygen sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
14. If rear oxygen sensor operates correctly, go to next step. If rear oxygen sensor does not operate correctly, check rear oxygen sensor circuit. Perform DTC TEST NO. 9.
15. Using scan tool, perform scan tool service data inspection procedure on front oxygen sensor when engine is suddenly accelerated. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
16. If front oxygen sensor operates within 600-1000 millivolts during sudden acceleration, go to next step. If front oxygen sensor does not operate within 600-1000 millivolts during sudden acceleration, check front oxygen sensor system. Perform INSPECTION PROCEDURE 30.
17. Using scan tool, perform scan tool service data inspection procedure on front oxygen sensor with engine idling and at 2500 RPM. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
18. If front oxygen sensor operates correctly with engine idling and at 2500 RPM, go to step 21). If front oxygen sensor does not operate correctly with engine idling and at 2500 RPM, go to next step.
19. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
20. Check for defective intake manifold gasket, broken air intake tube or vacuum hose or defective PCV valve. If these components are okay, check for clogged injector(s).
21. Using scan tool actuator test, check turbocharger wastegate solenoid. See «SCAN TOOL ACTUATOR TESTS»(ref-11311-S36429429792000111300000) after SCAN TOOL SERVICE DATA INSPECTION PROCEDURE.
22. If turbocharger wastegate solenoid operates correctly when performing scan tool actuator test, go to next step. If turbocharger wastegate solenoid does not operate correctly when performing scan tool actuator test, check turbocharger wastegate solenoid system. Perform DTC TEST NO. 30.
23. Using scan tool actuator test, check fuel pressure solenoid. See «SCAN TOOL ACTUATOR TESTS»(ref-11311-S36429429792000111300000) after SCAN TOOL SERVICE DATA INSPECTION PROCEDURE.
24. If fuel pressure solenoid operates correctly when performing scan tool actuator test, inspection procedure is complete. If fuel pressure solenoid does not operate correctly when performing scan tool actuator test, check fuel pressure solenoid system. Perform DTC TEST NO. 31.

INSPECTION PROCEDURE 39 - WHEN SURGE OCCURS

1. Perform scan tool service data inspection procedure on closed throttle position switch. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
2. If closed throttle position switch operates correctly, go to next step. If closed throttle position switch does not operate correctly, check closed throttle position switch circuit. Perform DTC TEST NO. 25.
3. Perform scan tool service data inspection procedure on intake air temperature sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
4. If intake air temperature sensor operates correctly, go to next step. If intake air temp sensor does not operate correctly, check intake air temp sensor circuit. Perform DTC TEST NO. 3.
5. Perform scan tool service data inspection procedure on barometric pressure sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
6. If barometric pressure sensor operates correctly, go to next step. If barometric pressure sensor does not operate correctly, check barometric pressure sensor circuit. Perform DTC TEST NO. 2.
7. Perform scan tool service data inspection procedure on engine coolant temp sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
8. If engine coolant temperature sensor operates correctly, go to next step. If engine coolant temperature sensor does not operate correctly, check engine coolant temperature sensor circuit. Perform DTC TEST NO. 4.
9. Perform scan tool service data inspection procedure on throttle position sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
10. If throttle position sensor operates correctly, go to next step. If throttle position sensor does not operate correctly, check throttle position sensor circuit. Perform DTC TEST NO. 5.
11. Using scan tool actuator test, check EGR solenoid. See «SCAN TOOL ACTUATOR TESTS»(ref-11311-S36429429792000111300000) after SCAN TOOL SERVICE DATA INSPECTION PROCEDURE.
12. If EGR solenoid operates correctly when performing scan tool actuator test, go to next step. If EGR solenoid does not operate correctly when performing scan tool actuator test, check EGR solenoid circuit. Perform DTC TEST NO. 19
13. Perform scan tool service data inspection procedure on rear oxygen sensor. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
14. If rear oxygen sensor operates correctly, go to next step. If rear oxygen sensor does not operate correctly, check rear oxygen sensor circuit. Perform DTC TEST NO. 9.
15. Using scan tool, perform scan tool service data inspection procedure on front oxygen sensor when engine is suddenly accelerated. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
16. If front oxygen sensor operates within 600-1000 millivolts during sudden acceleration, go to next step. If front oxygen sensor does not operate within 600-1000 millivolts during sudden acceleration, check front oxygen sensor system. Perform INSPECTION PROCEDURE 30.
17. Using scan tool, perform scan tool service data inspection procedure on front oxygen sensor with engine idling and at 2500 RPM. See «SCAN TOOL SERVICE DATA INSPECTION PROCEDURE»(ref-11311-S06160688132000111300000) .
18. If front oxygen sensor operates correctly with engine idling and at 2500 RPM, inspection procedure is complete. If front oxygen sensor does not operate correctly with engine idling and at 2500 RPM, go to next step.
19. Check fuel pressure. See the «BASIC TESTING - TURBO»(ref-11296) article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
20. Check for defective intake manifold gasket, broken air intake tube or vacuum hose, or defective PCV valve. If these components are okay, check for clogged injector(s).

INSPECTION PROCEDURE 40 - ECM POWER SUPPLY & GROUND CIRCUITS

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

1. Ensure ignition off. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console. Disconnect the 26-pin ECM connector B-53, 16-pin ECM connector B-54 and 22-pin ECM connector B-56 from ECM.
2. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 82 (Black/White wire) on 22-pin ECM connector B-56. Battery voltage should exist.
3. If battery voltage exists, go to step 6). If battery voltage does not exist, check for defective terminals or connections at connector for ignition switch.
4. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
5. If no trouble symptom exists, check wiring harness between ECM and ignition switch. If wiring harness is defective, repair wiring harness. If wiring harness is okay, check ignition switch.
6. Using voltmeter, check voltage between ground and terminal No. 38 (Blue/Green wire) on 16-pin ECM connector B-54. Battery voltage should exist.
7. If battery voltage exists, go to step 10). If battery voltage does not exist, check for defective terminals or connections at MFI relay. MFI relay on passenger's side of center console, just in front of emergency brake lever. see scheme 16
8. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
9. If no trouble symptom exists, check wiring harness between ECM and MFI relay. If wiring harness is defective, repair wiring harness. If wiring harness is okay, check wiring to MFI relay from fusible link.
10. Ensure ignition is on. Install jumper wire between terminal No. 38 (Blue/Green wire) on 16-pin ECM connector B-54 and ground. This will energize the MFI relay.
11. Using voltmeter, check voltage between ground and terminals No. 12 (Red wire) and No. 25 (Red wire) on 26-pin ECM connector B-53. Battery voltage should exist. Remove jumper wire.
12. If battery voltage exists, go to step 15). If battery voltage does not exist, check for defective terminals or connections at MFI relay. MFI relay on passenger's side of center console, just in front of emergency brake lever. see scheme 16
13. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
14. If no trouble symptom exists, check wiring harness between ECM and MFI relay. If wiring harness is defective, repair wiring harness. If wiring harness is okay, check wiring to MFI relay from fusible link.
15. Ensure ignition is off. Using ohmmeter, check for continuity between ground and terminals No. 13 (Black wire) and No. 26 (Black wire) on 26-pin ECM connector B-53. Continuity should exist.
16. If continuity exists, go to next step. If no continuity exists, check for defective wiring harness between ECM and ground circuit on Black wire. Repair wiring harness as necessary.
17. Using voltmeter, check voltage between ground and terminal No. 80 (Red/Blue wire) on 22-pin ECM connector B-56. Battery voltage should exist.
18. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between ECM and battery. Repair wiring harness if defective.
19. Check for defective terminals or connections at 26-pin ECM connector B-53, 16-pin ECM connector B-54 and 22-pin ECM connector B-56. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

INSPECTION PROCEDURE 41 - FUEL PUMP CIRCUIT

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

1. Remove rear seat cushion and disconnect connector for the fuel pump. Connector is located on top of fuel tank at passenger's side front corner of fuel tank.
2. Using ohmmeter, check for continuity between ground and terminal No. 1 (Black wire) on FWD models, or terminal No. 2 (Black wire) on AWD models on wiring harness side of connector.
3. Continuity should exist. If continuity exists, go to next step. If no continuity exists, check for defective ground circuit on Black wire. Repair wiring as necessary.
4. Check for defective terminals or connections at connector for ignition switch and connector for fuel pump. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, go to next step.
5. Check for defective terminals or connections at connector B-72. Connector B-72 is a 6-pin Blue connector. see scheme 20 see scheme 20: Identifying Connectors for Procedure 41
6. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, go to next step.
7. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, go to next step.
8. Check wiring harness between connector for fuel pump and fuel pump check terminal. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace fuel pump.

INSPECTION PROCEDURE 42 - FUEL PUMP DRIVE CONTROL CIRCUIT

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

1. Ensure ignition is off. Disconnect connector at fuel pump relay. Fuel pump relay is located on passenger's side of center console, just in front of emergency brake lever. see scheme 16
2. Turn ignition on. Using voltmeter, check voltage between ground and terminals No. 3 (Black/White wire) and No. 4 (Black/White wire) at wiring harness side of connector for fuel pump relay. Go to next step.
3. Battery voltage should exist. If battery voltage exists, go to step 7). If battery voltage does not exist, go to next step.
4. Check for defective terminals or connections at connector for ignition switch. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, go to next step.
5. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, go to next step.
6. Check wiring harness between fuel pump relay and connector at ignition switch. If wiring harness is defective, repair wiring harness. If wiring harness is okay, check ignition switch.
7. Reinstall connector on fuel pump relay. Ensure ignition off. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console. Disconnect the 26-pin ECM connector B-53 from ECM.
8. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 8 (White/Red wire) on 26-pin ECM connector B-53. Battery voltage should exist.
9. If battery voltage exists, go to step 13). If battery voltage does not exist, check for defective terminals or connections at connector on fuel pump relay.
10. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000)
11. If no trouble symptom exists, check wiring harness between ECM and fuel pump relay. If wiring harness is defective, repair wiring harness.
12. Check for defective terminals or connections at 26-pin ECM connector B-53. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace ECM.

INSPECTION PROCEDURE 43 - VOLUME AIRFLOW SENSOR CIRCUIT

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

1. Ensure ignition is off. Disconnect connector from volume airflow sensor. Volume airflow sensor is located on passenger's side of engine compartment, near air cleaner.
2. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 4 (Red wire) on wiring harness side of connector.
3. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between volume airflow sensor and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. see scheme 16 Repair wiring harness as necessary.
4. Using voltmeter, check voltage between ground and terminal No. 3 (Blue/Yellow) on wiring harness side of connector with ignition on. Voltage should be 4.8-5.2 volts.
5. If voltage is within specification, go to step 8). If voltage is not within specification, go to next step.
6. Check for defective terminals or connections on connector for volume airflow sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
7. If no trouble symptom exists, check wiring harness between ECM and volume airflow sensor. The ECM is located below instrument panel, just in front of center console. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.
8. Using ohmmeter, check for continuity between ground and terminal No. 5 (Black wire) on wiring harness side of connector. Continuity should exist.
9. If continuity exists, go to step 12). If no continuity exists, check for defective terminals or connections on connector for volume airflow sensor.
10. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000).
11. If no trouble symptom exists, check wiring harness between ECM and volume airflow sensor. The ECM is located below instrument panel, just in front of center console. If wiring harness is defective, repair wiring harness. If wiring harness is okay, replace ECM.
12. Check for defective terminals or connections on connector for volume airflow sensor. If terminals or connections are defective, repair as necessary.
13. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000). If no trouble symptom exists, replace volume airflow sensor.

INSPECTION PROCEDURE 44 - THROTTLE POSITION SENSOR OUTPUT

CIRCUIT

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

1. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
2. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 84 (Brown/Red wire) on 22-pin ECM connector B-56 with throttle at idle position and full throttle position.
3. Voltage should be .3-1.0 volt at idle position and 4.5-5.5 volts at full throttle. If voltage is within specification, go to step 5). If voltage is not within specification, go to next step.
4. Check for defective terminals or connections at 22-pin ECM connector B-56. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, replace ECM.
5. Check for defective terminals or connections at connector on throttle position sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, go to next step.
6. Check for a trouble symptom. For specific symptoms, see the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check wiring harness between ECM and throttle position sensor. Repair wiring harness as necessary.

INSPECTION PROCEDURE 45 - INJECTOR CONTROL CIRCUIT

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

1. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
2. Ensure ignition is off. Disconnect 26-pin ECM connector B-53 from ECM.
3. Turn ignition on. Using voltmeter, check voltage between ground and terminals No. 1 (Green wire), 2 (Green/Yellow wire), No. 14 (Yellow/Black wire) and No. 15 (Green/Red wire) on 26-pin ECM connector B-53. Battery voltage should exist.
4. If battery voltage exists, go to step 6). If battery voltage does not exist, check for defective terminals or connections at each injector.
5. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, check wiring harness between ECM and connector for injector. Repair wiring harness as necessary.
6. Check for defective terminals or connections on 26-pin ECM connector B-53. If terminals or connections are defective, repair as necessary.
7. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) . If no trouble symptom exists, replace ECM.

INSPECTION PROCEDURE 46 - IGNITION SIGNAL CIRCUIT

Note. For Engine Control Module (ECM) terminal ID see scheme 3 For wiring diagram, see the WIRING DIAGRAMS article.

1. Ensure ignition is off. Disconnect connector at ignition power transistor. Ignition power transistor is mounted on top of engine, near ignition coil and contains an 8-pin Black connector.
2. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 6 (Black/White wire) on wiring harness side of connector for ignition power transistor. NOTE: When checking voltage at terminal No. 6 (Black/White wire) on the connector for ignition power transistor, terminal No. 6 is closer to the center of the connector. DO NOT use Black/White wire at terminal No. 8 at the end of the connector.
3. Battery voltage should exist. If battery voltage exists, go to step 6). If battery voltage does not exist, check for defective terminals or connections at ignition switch.
4. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000) .
5. If no trouble symptom exists, check wiring harness between ignition switch and ignition power transistor. Repair wiring harness if defective. If wiring harness is okay, check ignition switch.
6. Ensure ignition is on. Using voltmeter, check voltage between ground and terminal No. 4 (White wire) on wiring harness side of connector for ignition power transistor. Voltage should be at least 4 volts.
7. If voltage is within specification, go to next step. If voltage is not within specification, an open or short circuit exists in the ignition signal output wiring harness between ECM and ignition power transistor. Repair wiring harness. The ECM is located below instrument panel, just in front of center console.
8. Reinstall connector on ignition power resistor. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
9. Start engine. Using voltmeter, check voltage between ground and terminal No. 58 (White wire) on 12-pin ECM connector B-55.
10. Voltage should be .3-3.0 volts with engine at 3000 RPM. If voltage is within specification, replace ECM. If voltage is not within specification, go to next step.
11. Check for defective terminals or connections on 12-pin ECM connector B-55 and at connector on ignition power transistor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the «TROUBLE SYMPTOM INSPECTION»(ref-11311-S25206327872000111300000)
12. If no trouble symptom exists, check wiring harness between ECM and ignition power transistor. Repair wiring harness if defective. If wiring harness is okay, replace ignition power transistor.