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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 364 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - DTC P0443 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> DTC P2632 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the secondary fuel pump relay.
  2. Ignition ON, verify that a test lamp illuminates between the ground circuit terminal 85 and B+.
    • If the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance.
  3. Verify that a test lamp does not illuminate between the ground circuit terminal 85 and the control circuit terminal 86.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Remove the test lamp.
  5. Command the Fuel Pump 2 Relay ON with a scan tool. Verify the scan tool Fuel Pump Relay 2 Ckt. Short Gnd Test Status parameter is OK.
    • If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  6. Install a 3 A fused jumper wire between the secondary fuel pump relay control circuit terminal 86 and the ground circuit terminal 85. Command the fuel pump ON with a scan tool. Verify the scan tool Fuel Pump 2 Relay Ckt. Short Gnd Test Status parameter is Fault.
    • If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  7. If all circuits test normal, test or replace the secondary fuel pump relay.
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