Shift Interlock Systems: Diagnosis Chevrolet Tracker II

DIAGNOSTIC STARTING POINT

Begin system diagnosis by reviewing DESCRIPTION & OPERATION . Reviewing the description and operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the description and operation information will also help you determine if the condition described by the customer is normal operation. See SYMPTOM DIAGNOSIS in order to identify the correct procedure for diagnosing the system and where the procedure is located.

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the system. Inspect easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. Shift Lever Does Not Move With Brake Pedal Depressed
2. Shift Lever Can Be Moved Without Brake Pedal Depressed

See appropriate test under SYMPTOM TESTS .

SYMPTOM TESTS

SYMPTOM TEST INDEX

TEST A: SHIFT LEVER DOES NOT MOVE WITH BRAKE PEDAL DEPRESSED (WITH CRUISE CONTROL)

Note. For circuit and terminal identification, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

1. Did you review description and operation? If so, go to next step. If not, see «DESCRIPTION & OPERATION»(ref-131138-S32194532302001121100000).
2. Turn ignition on. Depress brake pedal. If gearshift lever can be moved from Park, check for intermittent condition. See «SYMPTOM DIAGNOSIS»(ref-131138-S29049569782002012600000) under TROUBLE SHOOTING. If gearshift lever cannot be moved from Park, go to next step.
3. Change shift lock relay with known good relay (horn relay or compressor relay). (Scheme 1) Turn ignition on. Depress brake pedal. Attempt to move gearshift lever from Park. If shift interlock system operates properly, go to step 15. If shift interlock system does not operate properly, go to next step.
4. Connect scan tool. Turn ignition on. Monitor BRAKE SWITCH status in transmission data list. Depress the brake pedal. If brake switch status changed to APPLIED when the brake pedal depressed, go to step 7. If status did not change to APPLIED, go to next step.
5. Check stoplamp switch supply voltage circuit (Green wire) for an open. If problem was found and repaired, go to step 23. If no problem was found, go to next step.
6. Check stoplamp switch signal circuit (Green/White wire) for an open. If problem was found and repaired, go to step 23. If no problem was found, go to step 16.
7. Check shift lock relay coil supply voltage circuit (Green/White wire) for an open. If problem was found and repaired, go to step 23. If no problem was found, go to next step.
8. Check shift lock relay supply voltage circuit (Blue/Green wire) for an open. If problem was found and repaired, go to step 23. If no problem was found, go to next step.
9. Monitor TRANSMISSION RANGE status in the transmission data list on the scan tool. If scan tool indicates "P" position, go to step 12. If scan tool does not indicate "P" position, go to next step.
10. Check transmission range switch supply voltage circuit (Yellow wire) for an open. If problem was found and repaired, go to step 23. If no problem was found, go to next step.
11. Check transmission range switch signal circuit (Orange/Green wire) for an open. If problem was found and repaired, go to step 23. If no problem was found, go to step 17.
12. Check shift lock relay switch supply voltage circuit (Orange/Green wire) for an open. If problem was found and repaired, go to step 23. If no problem was found, go to next step.
13. Check shift lock solenoid supply voltage circuit (Blue/Green wire) for an open. If problem was found and repaired, go to step 23. If no problem was found, go to next step.
14. Check shift lock solenoid ground circuit (Black wire) for an open. If problem was found and repaired, go to step 23. If no problem was found, go to step 18.
15. Check for poor connection at shift lock relay harness connector. If problem was found and repaired, go to step 23. If no problem was found, go to step 19.
16. Check for poor connection at stoplamp switch harness connector. If problem was found and repaired, go to step 23. If no problem was found, go to step 20.
17. Check for poor connection at transmission range switch harness connector. If problem was found and repaired, go to step 23. If no problem was found, go to step 21.
18. Check for poor connection at shift lock solenoid harness connector. If problem was found and repaired, go to step 23. If no problem was found, go to step 20.
19. Replace shift lock relay. After repairs, go to step 23.
20. Adjust or replace stoplamp switch. See «STOPLAMP SWITCH»(ref-131138-S01788796042001122000000) under REMOVAL & INSTALLATION. After repairs, go to step 23.
21. Replace transmission range switch. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step 23.
22. Replace shift lock solenoid. See «SHIFT LOCK SOLENOID»(ref-131138-S34553736432001121100000) under REMOVAL & INSTALLATION. After repairs, go to next step.
23. Check system operation to verify repairs. See «DESCRIPTION & OPERATION»(ref-131138-S32194532302001121100000). If system operates properly, system is okay. If system does not operate properly, go to step 3.

Scheme 1

TEST B: SHIFT LEVER DOES NOT MOVE WITH BRAKE PEDAL DEPRESSED (WITHOUT CRUISE CONTROL)

Note. For circuit and terminal identification, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

1. Did you review description and operation? If so, go to next step. If not, see «DESCRIPTION & OPERATION»(ref-131138-S32194532302001121100000) .
2. Turn ignition on. Depress brake pedal. If gearshift lever can be moved from Park, check for intermittent condition. See «SYMPTOM DIAGNOSIS»(ref-131138-S29049569782002012600000) under TROUBLE SHOOTING. If gearshift lever cannot be moved from Park, go to next step.
3. Connect scan tool. Monitor TRANSMISSION RANGE status in transmission data list. Turn ignition on. If TRANSMISSION RANGE indicates "P" position, go to step 5 . If TRANSMISSION RANGE does not indicate "P" position, go to next step.
4. Check transmission range switch supply voltage circuit (Yellow wire) for an open. If problem was found and repaired, go to step 15 . If no problem was found, go to step 10 .
5. Check transmission range switch signal circuit (Orange/Green wire) for an open. If problem was found and repaired, go to step 15 . If no problem was found, go to next step.
6. Check operation of stoplamp switch. Both sets of contacts in switch should be closed when brake pedal is applied. If stoplamp switch operates properly, go to next step. If stoplamp switch does not operate properly, go to step 9 .
7. Check shift lock solenoid supply voltage circuit (Blue/Green wire) for an open. If problem was found and repaired, go to step 15 . If no problem was found, go to next step.
8. Check shift lock solenoid ground circuit (Black wire) for an open. If problem was found and repaired, go to step 15 . If no problem was found, go to step 11 .
9. Inspect for poor connection at stoplamp switch harness connector. If problem was found and repaired, go to step 15 . If no problem was found, go to step 12 .
10. Inspect for poor connection at transmission range switch harness connector. If problem was found and repaired, go to step 15 . If no problem was found, go to step 13 .
11. Inspect for poor connection at shift lock solenoid harness connector. If problem was found and repaired, go to step 15 . If no problem was found, go to step 14 .
12. Adjust or replace stoplamp switch. See «STOPLAMP SWITCH»(ref-131138-S01788796042001122000000) under REMOVAL & INSTALLATION. After repairs, go to step 15 .
13. Replace transmission range switch. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step 15 .
14. Replace shift lock solenoid. See «SHIFT LOCK SOLENOID»(ref-131138-S34553736432001121100000) under REMOVAL & INSTALLATION. After repairs, go to next step.
15. Check system operation to verify repairs. See «DESCRIPTION & OPERATION»(ref-131138-S32194532302001121100000) . If system operates properly, system is okay. If system does not operate properly, go to step 3 .

TEST C: SHIFT LEVER CAN BE MOVED WITHOUT BRAKE PEDAL DEPRESSED (WITH CRUISE CONTROL)

Note. For circuit and terminal identification, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

1. Did you review description and operation? If so, go to next step. If not, see «DESCRIPTION & OPERATION»(ref-131138-S32194532302001121100000).
2. Turn ignition on. If gearshift lever can be moved from Park without depressing brake pedal, check for intermittent condition. See «SYMPTOM DIAGNOSIS»(ref-131138-S29049569782002012600000) under TROUBLE SHOOTING. If gearshift lever can be moved from Park, go to next step.
3. Change shift lock relay with known good relay (horn relay or compressor relay). (Scheme 1) Turn ignition on. Depress brake pedal. Attempt to move gearshift lever from Park. If shift interlock system operates properly, go to step 7. If shift interlock system does not operate properly, go to next step.
4. Disconnect shift lock relay. If shift lock solenoid disengages, go to next step. If shift lock solenoid does not disengage, go to step 6.
5. Repair shift lock relay coil supply voltage circuit (Green/White wire) for short to voltage. After repairs, go to step 11.
6. Repair shift lock solenoid supply voltage circuit (Blue/Green wire) for short to voltage. If problem was found and repaired, go to step 11. If problem was not found, go to next step.
7. Inspect for poor connection at shift lock relay harness connector. If problem was found and repaired, go to step 11. If problem was not found, go to step 9.
8. Inspect for poor connection at shift lock solenoid harness connector. If problem was found and repaired, go to step 11. If problem was not found, go to step 10.
9. Replace shift lock relay. After repairs, go to step 11.
10. Replace shift lock solenoid. See «SHIFT LOCK SOLENOID»(ref-131138-S34553736432001121100000) under REMOVAL & INSTALLATION. After repairs, go next step.
11. Check system operation to verify repairs. See «DESCRIPTION & OPERATION»(ref-131138-S32194532302001121100000). If system operates properly, system is okay. If system does not operate properly, go to step 3.

TEST D: SHIFT LEVER CAN BE MOVED WITHOUT BRAKE PEDAL DEPRESSED (WITHOUT CRUISE CONTROL)

Note. For circuit and terminal identification, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

1. Did you review description and operation? If so, go to next step. If not, see «DESCRIPTION & OPERATION»(ref-131138-S32194532302001121100000) .
2. Turn ignition on. If gearshift lever can be moved from Park without depressing brake pedal, check for intermittent condition. See «SYMPTOM DIAGNOSIS»(ref-131138-S29049569782002012600000) under TROUBLE SHOOTING. If gearshift lever can be moved from Park, go to next step.
3. Disconnect stoplamp switch. If shift lock solenoid disengages, go to step 5 . If shift lock solenoid does not disengage, go to next step.
4. Repair shift lock solenoid supply voltage circuit (Blue/Green wire) for short to voltage. If problem was found and repaired, go to step 9 . If problem was not found, go to step 6 .
5. Inspect for poor connection at stoplamp switch harness connector. If problem was found and repaired, go to step 9 . If no problem was found, go to step 7 .
6. Inspect for poor connection at shift lock solenoid harness connector. If problem was found and repaired, go to step 9 . If problem was not found, go to step 8 .
7. Adjust or replace stoplamp switch. See «STOPLAMP SWITCH»(ref-131138-S01788796042001122000000) under REMOVAL & INSTALLATION. After repairs, go to step 9 .
8. Replace shift lock solenoid. See «SHIFT LOCK SOLENOID»(ref-131138-S34553736432001121100000) under REMOVAL & INSTALLATION. After repairs, go to next step.
9. Check system operation to verify repairs. See «DESCRIPTION & OPERATION»(ref-131138-S32194532302001121100000) . If system operates properly, system is okay. If system does not operate properly, go to step 3 .