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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0016 To DTC P0341) >> DTC P0230 >> Circuit/System Testing

Circuit/System Testing

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  1. Turn OFF the ignition.
  2. Remove the fuel pump relay and turn ON the ignition, with the engine OFF.
  3. Probe the control circuit of the fuel pump relay with a test lamp that is connected to a good ground.
  4. Command the fuel pump ON and OFF with a scan tool.
    • If the test lamp remains illuminated, test the fuel pump relay control circuit for a short to voltage or a faulty ECM.
    • If the test lamp does not turn ON and OFF with each command, test the fuel pump relay control circuit for a short to ground or an open. If the circuit tests normal replace the control module.
  5. Connect a test lamp between the control circuit of the fuel pump relay and the ground circuit of the relay.
  6. Command the fuel pump ON and OFF with a scan tool.
    • If the test lamp does not turn ON and OFF with each command, test the fuel pump relay ground circuit for an open or high resistance.
    • If the test lamp turns ON and OFF with each command, replace the fuel pump relay.
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