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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1050 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L, 6.2L, Or 7.0L - DTC P0230 To DTC P0690) >> DTC P0231, P0232, or P023F >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the fuel pump.
  2. Connect a test lamp between the control circuit terminal D and ground.
  3. Ignition ON, command the fuel pump ON and OFF using a scan tool. The test lamp should turn ON and OFF as commanded.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the FPCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FPCM.
  4. Ignition OFF, connect a test lamp between the control circuit terminal A and the control circuit terminal D.
  5. Ignition ON, command the fuel pump ON using a scan tool. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the control circuit terminal A for a short to voltage or an open/high resistance. If the circuit tests normal, replace the FPCM.
  6. If all circuits test normal, replace the fuel tank fuel pump module.
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