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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 379 (Engine Controls Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P1352: Ic Output High/Pulse Detected >> 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. Turn ignition switch to OFF position. Disconnect the Powertrain Control Module (PCM) harness connectors. Measure the resistance between the IC timing control and low reference circuits of the ICM. Turn ignition switch to RUN position, engine OFF. Probe the IC timing signal circuit using a test light connected to battery voltage. Is the resistance 6000-10,000 ohms? If no, go to step  6. If no, go to next step.
  4. Turn ignition switch to OFF position. Leave the PCM disconnected. Disconnect the Ignition Control Module (ICM) harness connector. Check the IC timing signal circuit of the ICM for an open. Did you find and correct the condition? If yes, go to step  9. If no, go to next step.
  5. Check for an intermittent and for a poor connection at the ICM. Did you find and correct the condition? If yes, go to step  9. If no, go to step  7.
  6. Check for an intermittent and for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  9. If no, go to step  8.
  7. Replace the ICM. After repair, go to step  9.
  8. 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.
  9. 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.
  10. 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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