LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Electrical >> Gauges >> Analog Instrument Panels >> System Tests >> Test J: Speedometer And/Or Odometer Inaccurate Or Inoperative

Test J: Speedometer And/Or Odometer Inaccurate Or Inoperative

  1. If IPC diagnostic system check was performed, go to next step. If IPC diagnostic system check was not performed, go to INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing IPC diagnostic system check, go to next step.
  2. Raise and support vehicle's drive wheels. Start engine and allow to idle. Place transmission into Drive (A/T) or 3rd gear (M/T). Using scan tool, select PCM ENGINE DATA 1 data list and monitor VEHICLE SPEED. If scan tool matches speedometer display, go to next step. If scan tool does not match speedometer display, go to step  4 .
  3. If odometer operates properly, problem may be intermittent. To diagnose intermittent, go to INTERMITTENT TROUBLE CODE DETERMINATION in BODY CONTROL MODULES - CORVETTE article. If odometer does not operate properly, go to step  8 .
  4. Turn ignition off. Locate and disconnect PCM connectors. See Figure . Turn ignition on. Using DVOM, measure voltage between ground and PCM connector C2 terminal No. 50 (Dark Green/White wire). See Figure . If voltage is more than 9.6 volts, go to step  6 . If voltage is less than 9.6 volts, go to next step.
  5. Check for open, short to ground or high resistance in Dark Green/White wire between IPC connector C1 terminal A7 and PCM connector C2 terminal No. 50. See Figure and Figure . Repair as necessary. After repairs, go to step  10 . If circuit is okay, go to step  7 .
  6. Check for poor connections at IPC connector. Repair as necessary. After repairs, go to step  10 . If connections are okay, go to step  8 .
  7. Check for poor connections at PCM connectors. Repair as necessary. After repairs, go to step  10 . If connections are okay, go to step  9 .
  8. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs, go to step  10 .
  9. Replace PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  10. Recheck system operation to verify the repair. If system operates properly, repair is complete. If system does not operate properly, go to step  2 .
scientia non olet · About LEMON Manuals