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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 368 (Engine Controls Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P1362: Ic Cylinder No. 2 Not Toggling After Enable >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. 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. Observe the Freeze Frame/Failure Records for this DTC. Turn ignition switch to OFF position for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running. See CONDITIONS FOR RUNNING . 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. Go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.
  3. Is P1361 also set? If yes, go to step  6. If no, go to next step.
  4. Turn ignition switch to OFF position. Disconnect the PCM harness connectors. Turn ignition switch to RUN position, engine OFF. Probe the Ignition Control (IC) timing signal circuit of the Ignition Control Module (ICM) using a test light connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  11.
  5. Turn ignition switch to OFF position. Leave the PCM disconnected. Disconnect the ICM harness connector. Turn ignition switch to RUN position, engine OFF. Probe the IC timing signal circuit of the ICM using a test light connected to a good ground. Does the test light illuminate? If yes, go to step  12. If no, go to step  10.
  6. Turn ignition switch to OFF position. Disconnect the PCM harness connectors. Disconnect ICM harness connector. Probe the IC timing control circuit of the ICM using a test light connected to battery voltage. Does the test light illuminate? If yes, go to step  13. If no, go to next step.
  7. Leave the ignition OFF. Leave the PCM disconnected Leave the ICM disconnected. Probe the IC timing signal circuit of the ICM using a test light connected to a good ground. Does the test light illuminate? If yes, go to step  14. If no, go to next step.
  8. Leave the ignition OFF. Leave the PCM disconnected. Leave the ICM disconnected. Check for a short between the IC timing control and IC timing signal circuits. Did you find and correct the condition? If yes, go to step  17. If no, go to next step.
  9. Leave the ignition OFF. Reconnect the ICM. Leave the PCM disconnected. Turn ignition switch to RUN position, engine OFF. Measure the resistance between the IC timing control circuit of the ICM and a good ground. Observe the DMM while probing the IC timing signal circuit of the ICM using a test light connected to battery positive voltage. Does the resistance switch between 100-600 ohms to 6000-10,000 ohms? If yes, go to step  11. If no, go to next step.
  10. Check for shorted terminals or for a poor connection at the ICM. Did you find and correct the conditions? If yes, go to step  17. If no, go to step  15.
  11. Check for shorted terminals or for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  17. If no, go to step  16.
  12. Repair the short to voltage in the IC timing signal circuit of the ICM. After repair, go to step  17.
  13. Repair the short to ground in the IC timing control circuit of the ICM. After repair, go to step  17.
  14. Repair the short to ground in the IC timing signal circuit of the ICM. After repair, go to step  17.
  15. Replace the ICM. After repair, go to step  17.
  16. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  17. Using a scan tool, clear the DTCs. Turn ignition switch to OFF position. Start the engine. Operate the vehicle within the Conditions For Running. See CONDITIONS FOR RUNNING . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  18. Using the scan tool, observe the stored information in 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 at this time.
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