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Shift Interlock Systems: Diagnosis Chevrolet Malibu V facelift

Automatic Trans ~1140 words

DIAGNOSTIC STARTING POINT

Begin the 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 A/T shift lock control 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

CAUTIONUse caution when probing fuse or junction blocks, or any connectors. Damage may result to connector receptacle if probe or terminal being used is too large. Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.
SymptomTest
Shift Lever Does Not Move With Brake Pedal DepressedA
Shift Lever Can Be Moved Without Brake Pedal DepressedB

SYMPTOM TEST INDEX

TEST A: SHIFT LEVER DOES NOT MOVE WITH BRAKE PEDAL DEPRESSED

Note. For circuit reference, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

  1. Did you review SYMPTOM DIAGNOSIS and all the necessary inspections? If so, go to next step. If not, see «SYMPTOM DIAGNOSIS»(ref-132842-S39862465012002020100000) under TROUBLE SHOOTING.
  2. Turn ignition switch to ON position. Depress the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, check for Intermittent condition. See «SYMPTOM DIAGNOSIS»(ref-132842-S39862465012002020100000) under TROUBLE SHOOTING. If not, go to next step.
  3. Turn ignition switch to OFF position. Disconnect the stoplamp switch. Turn ignition switch to ON position. Depress the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to step 5 . If not, go to next step.
  4. Turn ignition switch to OFF position. Disconnect the A/T shift lock control actuator. Turn ignition switch to ON position. Depress the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to step 6 . If not, go to step 7 .
  5. Inspect the stoplamp switch for poor connections. Did you find and correct the condition? If so, go to step 10 . If not, go to step 8 .
  6. Inspect the A/T shift lock control actuator for poor connections. Did you find and correct the condition? If so, go to step 10 . If not, go to step 9 .
  7. Repair the A/T shift control actuator supply circuit (Dark Green/White wire) for short to voltage. After repairs, go to step 10 .
  8. Replace the stoplamp switch. See «STOPLAMP SWITCH»(ref-132842-S28746739972002020100000) under REMOVAL & INSTALLATION. After repairs, go to step 10 .
  9. Replace the A/T shift lock control actuator. See «SHIFT LOCK ACTUATOR»(ref-132842-S22724159082002020400000) under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  10. Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, go to step 2 .

TEST B: SHIFT LEVER CAN BE MOVED WITHOUT BRAKE PEDAL DEPRESSED

Note. For circuit reference, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

  1. Did you review SYMPTOM DIAGNOSIS and all the necessary inspections? If so, go to next step. If not, see «SYMPTOM DIAGNOSIS»(ref-132842-S39862465012002020100000) under TROUBLE SHOOTING.
  2. Apply the parking brake and block the wheels. Turn ignition switch to ON position. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to next step. If not, check for intermittent condition. See «SYMPTOM DIAGNOSIS»(ref-132842-S39862465012002020100000) under TROUBLE SHOOTING.
  3. Turn ignition switch to OFF position. Connect a test light between ground and the ignition feed circuit (Pink wire) at the PNP switch. Turn ignition switch to ON position. Does the test light illuminate? If so, go to next step. If not, go to step 12 .
  4. Ensure gearshift lever is in the Park position. Connect a test light between ground and the PNP switch park signal circuit (Light Green wire) at the PNP switch. Does the test light illuminate? If so, go to next step. If not, go to step 9 .
  5. Connect a test light between ground and the PNP switch park signal circuit (Light Green wire) at the stoplamp switch. Does the test light illuminate? If so, go to next step. If not, go to step 13 .
  6. Connect a test light between ground and the A/T shift lock control actuator supply circuit (Dark Green/White wire) at the stoplamp switch. Press and release the brake pedal several times. Does the test light turn ON and OFF with the brake pedal? If so, go to next step. If not, go to step 10 .
  7. Connect a test light between ground and the A/T shift lock control actuator supply circuit (Dark Green/White wire) at the actuator. Press the brake pedal. Does the test light illuminate? If so, go to next step. If not, go to step 14 .
  8. Connect a test light between the ground circuit (Black wire) at the A/T shift lock control actuator and battery voltage. Does the test light illuminate? If so, go to step 11 . If not, go to step 15 .
  9. Inspect the PNP switch for poor connections. Did you find and correct the condition? If so, go to Step 19 . If not, go to step 16 .
  10. Inspect stoplamp switch harness connector for poor connections. Did you find and correct the condition? If so, go to step 19 . If not, go to step 17 .
  11. Inspect the A/T shift lock control actuator for poor connections. Did you find and correct the condition? If so, go to step 19 . If not, go to step 18 .
  12. Repair the open in the ignition feed circuit (Pink wire). After repairs, go to step 19 .
  13. Repair the open in the PNP switch park signal circuit (Light Green wire). After repairs, go to step 19 .
  14. Repair the open in the A/T shift lock control actuator supply circuit (Dark Green/White wire). After repairs, go to step 19 .
  15. Repair the open in the A/T shift lock control actuator ground circuit (Black wire). After repairs, go to step 19 .
  16. Replace the PNP switch. See appropriate AUTOMATIC article in AUTOMATIC TRANSMISSIONS. After repairs, go to step 19 .
  17. Replace the stoplamp switch. See «STOPLAMP SWITCH»(ref-132842-S28746739972002020100000) under REMOVAL & INSTALLATION. After repairs, go to step 19 .
  18. Replace the A/T shift lock control actuator. See «SHIFT LOCK ACTUATOR»(ref-132842-S22724159082002020400000) under REMOVAL & INSTALLATION. After repairs, go to next step.
  19. Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, go to step 2 .

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