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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 942 (Engine Controls And Fuel - 6.6L (LMM) - DTC P154B To DTC P2693) >> DTC P2632 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

  1. Turn OFF the ignition.
  2. Remove the fuel pump relay and turn ON the ignition, with the engine OFF.
  3. Connect a test lamp between the control circuit of the fuel pump relay and ground.
  4. Command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF with each command.
    • If the test lamp remains illuminated, test the fuel pump relay control circuit for a short to voltage. If the circuit tests normal, replace the 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 circuits test normal, replace the ECM.
  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. The test lamp should turn ON and OFF with each command.
    • 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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