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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P1637: Generator "L" Terminal Circuit ("F" Body) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Start and operate engine at idle. Using scan tool, monitor generator "L" terminal parameter. If scan tool indicates that generator "L" is inactive, go to next step. If scan tool does not indicate that generator "L" is inactive, see DIAGNOSTIC AIDS .
  3. Using a test light connected to ground, probe generator battery feed circuit. If test light illuminates, go to next step. If test light does not illuminate, diagnose charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.
  4. Turn ignition off. Disconnect generator harness connector. Start engine. Check voltage to ground at generator harness connector terminal "B". If voltage reading is 10 volts or greater, go to step  11. If voltage is not 10 volts or greater, go to next step.
  5. Turn ignition off. Disconnect PCM harness connector. Check continuity between generator harness connector terminal "B" and PCM harness connector. If continuity exists, go to next step. If continuity does not exist, go to step  8.
  6. Check continuity between battery ground and generator harness connector terminal "B". If continuity exists, go to next step. If continuity does not exist, go to step  9.
  7. Repair short to ground in generator circuit. After repairs, go to step  13.
  8. Repair open/high resistance in generator circuit. After repairs, go to step  13.
  9. Check for poor connections at PCM harness connector. Repair as necessary. After repairs, go to step  13. If connections are okay, go to next step.
  10. Replace PCM. Program replacement PCM using required equipment.
  11. Check for poor connections at generator harness connector. Repair as necessary. After repairs, go to step  13. If connections are okay, go to next step.
  12. Replace generator. After replacing generator, go to next step.
  13. Using scan tool, read and record FAILURE RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, select SPECIFIC DTC INFO for this 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.
  14. Using scan tool, select CAPTURE INFO and REVIEW INFO option. If any undiagnosed DTCs are set, diagnose affected DTCs.
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