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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P1374: Crankshaft Position Sensor 3X Reference Circuit Malfunction >> Diagnostic Procedures

Diagnostic Procedures

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS. After performing powertrain diagnostic system check, go to next step.
  2. Attempt to start engine. If engine starts and continues to run, go to next step. If engine cranks but does not run, diagnose no-start condition. See NO START DIAGNOSIS in appropriate BASIC DIAGNOSTICS article.
  3. Observe the FREEZE FRAME/FAILURE RECORDS for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the conditions for running the DTC or within the parameters observed in FREEZE FRAME/FAILURE RECORDS. If DTC fails this ignition cycle, go to next step. If DTC does not fail this ignition cycle, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect ICM connector. Install Injector Test Light (J 34730-405) to any injector connector. Turn ignition on, with engine off. Connect a test light to battery voltage and repeatedly touch ICM connector terminal "D" (Purple/White wire). See Figure. Observe injector test light. If injector test light blinks, go to step  8. If injector test light does not blink, go to next step.
  5. Turn ignition off. Disconnect PCM connector. Turn ignition on, with engine off. Check for open, short to ground or short to voltage in Purple/White wire between ICM and PCM. Repair as necessary. After repairs, go to step  11. If circuit is okay, go to next step.
  6. Check for poor terminal connection at PCM connector. Replace loose terminal if necessary. After repairs, go to step  11. If terminals are okay, go to next step.
  7. Check for incorrect harness routing near secondary ignition components, carbon tracking on any component, ignition coil arcing to wiring harness or to ICM, ignition coils for cracks, or other signs of damage. Check secondary ignition wires arcing to wiring harness. Repair as necessary. After repairs, go to step  11. If no problem is found, go to step  10.
  8. Check for loose terminal connections at ICM. Replace loose terminals if necessary. Repair as necessary. After repairs, go to step  11. If terminal connections are okay, go to next step.
  9. Replace ICM. After replacing module, go to next step  11.
  10. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE PROGRAMMING  under PROGRAMMING. After replacing PCM, go to next step.
  11. Using scan tool, clear DTCs. Turn ignition off for at least 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  12. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.
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