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Home >> Cadillac >> 2007 >> XLR Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0654 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the C1 harness connector at the engine control module.
  2. Ignition ON, test for 9-11 volts between the engine speed signal circuit and ground.
    • If less than 9 volts, test the engine speed signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPC.
    • If greater than 11 volts, test the engine speed signal circuit for a short to voltage. If the circuit tests normal, replace the IPC.
  3. If all circuits test normal, test or replace the ECM.
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