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Home >> Chevrolet >> 2011 >> Caprice >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.0L - DTC Diagnostics And Troubleshooting >> Diagnostic Information and Procedures >> DTC P0230 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K27 FPCM. It may take up to 2 minutes for all vehicle systems to power down.
    2. NOTE:

    Voltage is supplied once per ignition cycle for approximately 2 s at the time of ignition ON.

  2. Connect a test lamp between the fuel pump control circuit terminal 20 and ground. Verify the test lamp turns ON and OFF as the ignition is turned ON.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, verify that a test lamp does not stay illuminated between the fuel pump control circuit terminal 20 and ground.
    • If the test lamp stays illuminated, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. If all circuits test normal, test or replace the K27 FPCM.
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