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Home >> Buick >> 2001 >> Century Limited >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls Self-Diagnostics - 3.1L & 3.4L >> Diagnostic Tests >> DTC P1374: Crankshaft Position High-To-Low Resolution Frequency Correlation >> Diagnostic Procedure (Grand Prix)

Diagnostic Procedure (Grand Prix)

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK . After performing powertrain diagnostic system check, go to next step.
  2. Start engine. Allow engine to idle for 2 minutes. Using scan tool, observe DTC information. If scan tool indicates that this DTC failed this ignition cycle, go to step  4. If scan tool does not indicate that this DTC failed this ignition cycle, go to next step.
  3. Using scan tool, observe FREEZE FRAME/FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Operate vehicle within conditions noted in FREEZE FRAME/FAILURE RECORDS data. If scan tool indicates that this DTC failed this ignition cycle, go to next step. If scan tool does not indicate that this DTC failed this ignition cycle, go to DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect IC module harness connector C1. Remove INJ fuse (10-amp) from underhood fuse block. Turn ignition on. While observing engine speed parameter on scan tool, momentarily connect a test light between battery positive and IC module harness connector C1 terminal "E" (Purple/White wire). If scan tool displays an engine speed, go to step  8. If scan tool does not display an engine speed, go to next step.
  5. If test light illuminated, go to step  7. If test light did not illuminate, go to next step.
  6. Turn ignition off. Disconnect PCM harness connectors. See Figure. Turn ignition on. Check for open or short to voltage in low resolution engine speed signal circuit (Purple/White wire) between IC module harness connector C1 terminal "E" and PCM harness connector C1 terminal No. 8. See Figure. Repair circuit as necessary, then go to step  12. If circuit is okay, go to step  9.
  7. Turn ignition off. Disconnect PCM harness connectors. See Figure. Check for short to ground in low resolution engine speed signal circuit (Purple/White wire) between IC module harness connector C1 terminal "E" and PCM harness connector C1 terminal No. 8. See Figure. Repair circuit as necessary, then go to step  12. If circuit is okay, go to step  9.
  8. Check for faulty connections at IC module. If faulty connection is found, repair as necessary. After repairs, go to step  12. If connections are okay, go to step  10.
  9. Check for faulty connections at PCM. If faulty connection is found, repair as necessary. After repairs, go to step  12. If connections are okay, go to step  11.
  10. Replace IC module. After replacing IC module, go to step  12.
  11. Replace PCM. Program replacement PCM using required equipment. See PROGRAMMING . After replacing PCM, go to next step.
  12. 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 this DTC FAILED THIS IGN, return to step  2. If scan tool does not indicate that this DTC FAILED THIS IGN, go to next step.
  13. Using scan tool, observe all stored information. If scan tool displays any DTCs that have not been diagnosed, diagnose those DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
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