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Home >> Chevrolet >> 2000 >> Venture Plus >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1374: Crankshaft Position High-To-Low Resolution Frequency Correlation >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Attempt to start engine. If engine starts and runs, go to next step. If engine does not start and run, see appropriate BASIC DIAGNOSTIC PROCEDURES article.
  3. Using scan tool, read and record FAILS RECORD DATA. Operate vehicle within conditions noted in FAILED RECORDS DATA. Read SPECIFIC DTC. If scan tool indicates that that this DTC failed this ignition, go to next step. If scan tool does not indicate that this DTC failed this ignition, go to DIAGNOSTIC AIDS .
  4. Install Injector Test Light (J-34730-2A) to any injector harness connector. Turn ignition on. Using a test light connected to ground, repeatedly touch test light lead to 3X reference signal circuit while observing injector test light. If injector test light blinks/flashes, go to step  8. If injector test light does not flash, go to next step.
  5. Turn ignition off. Disconnect PCM connector. Check 3X reference signal circuit for open or short to ground. If problem is found, go to step  11. If no problem is found, go to next step.
  6. Check for faulty 3X reference signal circuit connection at PCM. Repair as necessary. After repairs, go to step  11. If connection is okay, go to next step.
  7. Check for incorrect harness routing near secondary ignition components, ignition coil arcing to wiring harness or IC module. Check ignition coils for cracks, carbon tracking or other signs of damage. Check for secondary ignition wire(s) 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 faulty connections at IC module. Repair as necessary. After repairs, go to step  11. If connections are okay, go to next step.
  9. Replace IC module. After replacing IC module, go to step  11.
  10. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  11. Read and record FAILURE RECORDS data for this DTC. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool indicates that that this DTC failed this ignition, return to step  2. If scan tool does not indicate that this DTC failed this ignition, system is okay.
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