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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 512 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0010 To DTC P0358) >> Diagnostic Information and Procedures >> DTC P0230 (Without FPCM) >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the KR23A fuel pump relay.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 Ω between the ground circuit terminal 85 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp does not illuminate between the relay coil control circuit terminal 86 and the ground circuit terminal 85.
    • If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  5. Remove the test lamp.
  6. Command the fuel pump relay ON with a scan tool. Verify the scan tool Fuel Pump Relay Ckt. Short Gnd. Test Status parameter is OK.
    • If not the specified value, test the fuel pump relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 engine control module.
  7. Install a 3 A fused jumper wire between the relay coil control circuit terminal 86 and the ground circuit terminal 85. Command the fuel pump relay ON with a scan tool. Verify the scan tool Fuel Pump Relay Ckt. Short Gnd. Test Status parameter is Fault
    • If not the specified value, test the relay coil control circuit for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  8. Verify that a test lamp does not illuminate between the component control circuit terminal 87 and ground.
    • If the test lamp illuminates, test the component control circuit for a short to voltage.
  9. Ignition OFF, disconnect the harness connector at the fuel tank sending unit.
  10. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 Ω between the fuel pump ground circuit terminal A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  11. Connect the harness connector at the fuel tank sending unit.
  12. Ignition ON, connect a 15 A fused jumper wire between the B+ circuit terminal 30 and the component control circuit terminal 87. Verify the fuel pump is activated.
    • If the fuel pump does not activate, test the component control circuit for an open/high resistance. If the circuit tests normal, test or replace the fuel tank fuel pump module.
  13. If all circuit test normal; test or replace the KR23A fuel pump relay.
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