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Home >> GMC >> 2001 >> Jimmy 2D Utility, RWD, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Analog Instrument Panels >> Diagnostic Tests >> DTC P0654: Engine Speed Out Of Range >> Diagnostic Procedure

Diagnostic Procedure

  1. If Instrument Panel Cluster (IPC) diagnostic system check has been performed, go to next step. If IPC diagnostic system check has not been performed, see INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Start engine. Using scan tool, observe ENGINE SPEED parameter in PCM data list. If parameter and tachometer indications match, system is functioning properly at this time. Check wiring and connectors for intermittent fault conditions. See WIRING DIAGRAMS  . If ENGINE SPEED parameter and tachometer do not match, go to next step.
  3. Turn ignition switch to OFF position. Disconnect PCM connector C2. Connect Signal Generator and Instrument Panel Tester (J33431-C) to PCM connector C2 terminal No. 10 (White wire) and vehicle ground. See Figure . Turn ignition switch to ON position. Set J33431-C to generate a tachometer signal. If tachometer on IPC agrees with generated tachometer signal, go to step  5 . If generated signal and IPC tachometer do not agree, go to next step.
  4. Check White wire between PCM connector C2 terminal No. 10 and IPC connector terminal A3. See Figure . See WIRING DIAGRAMS  . Check circuit for open or short to voltage. Repair wiring as necessary, then go to step  9 . If no problem is found, go to step  6 .
  5. Check PCM connector for poor connection and corroded terminals. Repair connection as necessary, then go to step  9 . If no problem is found, go to step  7 .
  6. Check IPC connector for poor connection or corroded terminals. Repair connection as necessary, then go to step  9 . If no problem is found, go to step  8 .
  7. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - TRUCKS article in ENGINE PERFORMANCE. When repair is complete, go to step  9 .
  8. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. When repair is complete, go to next step.
  9. Using scan tool, clear DTCs. Start engine and monitor for PCM DTCs If DTC P0654 resets, go to step  2 . If DTC does not reset, repair is complete.
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