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Home >> Cadillac >> 2007 >> CTS Base, 2.8 T, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.8L - DTC P0342 To DTC P0700 >> DTC P0654 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the C1 (LS2) or C2 (LP1/LY7) 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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