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Home >> Chevrolet >> 2002 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Analog Instrument Panels >> Diagnostic Tests >> DTC P0654: Engine Speed Output Circuit >> Diagnostic Procedures

Diagnostic Procedures

  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  . After performing IPC diagnostic system check, go to next step.
  2. With engine running, if vehicle tachometer indicates engine speed (RPM), see DIAGNOSTIC AIDS  . If no engine RPM is indicated, go to next step.
  3. Turn ignition off. Locate and disconnect PCM connectors. See Figure . Install Signal Generator Tester (J-33431-B) between ground and PCM connector C2 terminal No. 10 (White wire). See Figure . Turn ignition on. Turn tester on and set to generate a vehicle speed signal. If tachometer indicates any RPM, go to next step. If tachometer does not indicate any RPM, go to step  5 .
  4. Check for poor connections at PCM connector. Repair as necessary. After repairs, go to step  9 . If connections are okay, go to step  7 .
  5. Check for open, short to ground or high resistance in White wire between PCM connector C2 terminal No. 10 and IPC connector terminal A17. See Figure and Figure . White wire passes through underhood fuse block at connector C1 terminal D4 and connector C2 terminal A3. See Figure and Figure . Repair as necessary. After repairs, go to step  9 . If circuit is okay, go to next step.
  6. Check for poor connections at IPC. Repair as necessary. After repairs, go to step  9 . If connections are okay, go to step  8 .
  7. Replace PCM. See POWERTRAIN CONTROL MODULE  . After replacing PCM, go to step  9 .
  8. Replace IPC. See INSTRUMENT PANEL CLUSTER  . After repairs, go to next step.
  9. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If DTC does not reset, system is okay. If DTC resets, go to step  2 .
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