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HOMESERVICE MANUALSCHEVROLET1999CAVALIER Z24, 2D CONVERTIBLE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P1537-U1193DTC P1637DTC P1637: GENERATOR LIGHT CIRCUIT FAULT (3.4L "U" SERIES)DIAGNOSTIC PROCEDURES
1999 Chevrolet Cavalier Z24, 2D Convertible, Automatic

Diagnostic Procedures

1999 Chevrolet Cavalier Z24, 2D Convertible, AutomaticSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
  2. Check instrument cluster for proper operation. If instrument cluster operation is okay, go to next step. If instrument cluster is faulty, diagnose and repair instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on, with engine off. Using DVOM, check voltage between ground and affected PCM output circuit at PCM harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step  7.
  4. Set DVOM to 10-amp scale. Check and observe current between ground and affected PCM output circuit for 2 minutes. If reading is 0.05-1.50 amps, go to step  12. If reading is not 0.05-1.50 amps, go to next step.
  5. Disconnect instrument cluster harness connector. Check voltage between ground and affected PCM output circuit at PCM harness connector. If voltage reading is zero volts, go to step  15. If voltage reading is not zero volts, go to next step.
  6. Locate and repair short to voltage in affected PCM output circuit. After repairs, go to step  3.
  7. Check ignition feed fuse for instrument panel cluster indicator lights. If fuse is blown, go to next step. If fuse is okay, go to step  9.
  8. Locate and repair short to ground in ignition feed circuit for instrument panel cluster indicator lights. Replace fuse. After repairs, go to step  3.
  9. Disconnect instrument panel cluster harness connector. Turn ignition on, with engine off. Check voltage between ignition feed circuit for instrument panel cluster indicator lights and ground. If voltage reading is about battery voltage, go to next step. If voltage reading is not about battery voltage, go to step  14.
  10. Check affected PCM output circuit for open or short to ground. Repair as necessary. After repairs, go to step  3. If circuit is okay, go to next step.
  11. Check affected PCM output circuit and ignition feed circuit for poor connection at instrument panel cluster and at PCM. Repair as necessary. After repairs, go to step  3. If connections are okay, go to step  15.
  12. Turn ignition off. Reconnect PCM harness connector. Disconnect instrument panel cluster harness connector. Turn ignition on, with engine off. Using a test light, connect test light between affected PCM output circuit and ignition feed circuit at instrument panel cluster harness connector. Using scan tool in OUTPUTS TEST function, cycle the affected output circuit on and off. If test light flashes on and off, see DIAGNOSTIC AIDS . If test light does not flash on and off, go to next step.
  13. Check affected PCM output circuit for poor connection at PCM. Repair as necessary. After repairs, go to step  3. If connections are okay, go to step  16.
  14. Locate and repair open in ignition feed circuit to instrument panel cluster indicator lights. After repairs, go to step  3.
  15. Replace instrument panel cluster assembly. After replacing cluster assembly, go to step  3.
  16. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to step  3.
  17. 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 displays that this DTC FAILED THIS IGN, return to step  3. If scan tool does not display that this DTC FAILED THIS IGN, system is okay.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.