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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P1516: Throttle Actuator Control Module - Throttle Actuator Position Performance >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Are DTCs P1120, P1220, P1221, P1271, P1275 and P1280 also set? If yes, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
    3. NOTE: The throttle angle and pedal angle may not correspond during this procedure.
  3. Turn ignition on, with engine off. Observe the TP sensors No. 1 and 2 angle parameters. Apply and release the accelerator pedal several times. Does the TP sensors No. 1 and 2 angle parameters increase as the pedal is applied and decrease as the pedal is released? If yes, go to next step. If no, go to step  5.
  4. Observe the Freeze Frame/Failure Records for this DTC. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to next step. If no, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L & 3.0L VUE article.
  5. Turn ignition on, with engine off. Probe both sides of the ETC fuse with a test light. Does the test light illuminate on both sides of the fuse? If yes, go to next step. If no, go to step  16.
  6. Turn ignition off. Probe both sides of the ETC fuse with a test light. Does the test light illuminate on both sides of the fuse? If yes, go to step  22. If no, go to next step.
  7. Turn ignition off. Disconnect the ECM connector containing the ETC ignition 1 voltage circuit. Turn ignition on. Probe the ignition 1 voltage circuit with a test light. Does the test light illuminate? If yes, go to next step. If no, go to step  23.
  8. Turn ignition off. Inspect the throttle body for a throttle valve that is NOT in the rest position, a throttle valve that is binding open or closed, or a throttle valve that is free to move open or closed WITHOUT spring pressure. Did you find any of these conditions with the throttle body? If yes, go to step  24. If no, go to next step.
    9. NOTE: The test light may momentarily flash when testing these circuits. This is considered normal.
  9. Disconnect the throttle body harness connector. Turn ignition on, with engine off. Probe the TAC motor control No. 1 and 2 circuits with the test light connected to ground. Did the test light illuminate and remain illuminated on either circuit? If yes, go to step  13. If no, go to next step.
    10. NOTE: The test light may momentarily flash when testing these circuits. This is considered normal.
  10. Probe the TAC motor control No. 1 and 2 circuits with the test light connected to battery positive. Did the test light illuminate and remain illuminated on either circuit? If yes, go to step  14. If no, go to next step.
  11. Turn ignition off. Connect the test light between the TAC motor control No. 1 circuit and battery ground. Observe the test light as you turn ON the ignition. Does the test light flash ON and then turn OFF? If yes, go to next step. If no, go to step  15.
  12. Turn ignition off. Connect a test light between the TAC motor control No. 2 circuit and battery ground. Observe the test light as you turn ON the ignition. Does the test light flash ON and then OFF? If yes, go to step  18. If no, go to step  15.
  13. Turn ignition off. Disconnect the ECM connector that contains the TAC motor control circuits. Turn ignition on, with engine off. Probe the TAC motor control No. 1 and 2 circuits with the test light connected to ground. Does the test light illuminate? If yes, go to step  20. If no, go to step  19.
  14. Turn ignition off. Disconnect the ECM connector that contains the TAC motor control circuits. Probe the TAC motor control No. 1 and 2 circuits with the test light connected to battery positive. Does the test light illuminate? If yes, go to step  21. If no, go to step  19.
  15. Turn ignition off. Disconnect the ECM connector that contains the TAC motor control circuits. Test the TAC motor control No. 1 and 2 circuits for an open or for high resistance. Repair the circuit as necessary. Did you find and correct the condition? If yes, go to step  26. If no, go to step  19.
  16. Test the ETC ignition No. 1 voltage circuit for a short to ground. Did you find and correct the condition? If yes, go to step  26. If no, go to next step.
  17. Test the motor control No. 1 circuit for a short to ground. Did you find and correct the condition? If yes, go to step  26. If no, go to step  24.
  18. Test for a poor connection or terminal tension at the throttle body connector. Did you find and correct the condition? If yes, go to step  26. If no, go to step  24.
  19. Test for a poor connection or terminal tension at the ECM. Did you find and correct the condition? If yes, go to step  26. If no, go to step  25.
  20. Repair short to voltage on the circuit where the test light remained illuminated. After repairs, go to step  26.
  21. Repair short to ground on the circuit where the test light remained illuminated. After repairs, go to step  26.
  22. Repair short to voltage on the ETC ignition No. 1 voltage circuit. After repairs, go to step  26.
  23. Repair open or high resistance in the ignition No. 1 voltage circuit. After repairs, go to step  26.
  24. Replace throttle body assembly. After replacing throttle body, go to step  26.
  25. Turn ignition off. Replace ECM. Perform ECM relearn procedure. See ELECTRONIC CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing ECM, go to next step.
  26. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Operate vehicle within the conditions for running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate vehicle within the conditions observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  27. With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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