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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 P0449 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the Q13 evaporative emissions vent solenoid valve.
  2. Ignition OFF, verify that a test lamp illuminates between the B+ circuit terminal B or 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test all components connected to the B+ circuit and replace as necessary.
  3. Ignition ON, verify that a test lamp does not illuminate between the B+ circuit terminal B or 2 and the control circuit terminal A or 1.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 engine control module.
  4. Remove the test lamp, and install a 3 A fused jumper wire between the control circuit terminal A or 1 and the B+ circuit terminal B or 2. Command the vent solenoid ON with a scan tool. Verify the scan tool vent solenoid Ckt. Short Volts 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 K20 engine control module.
  5. If all circuits test normal, test or replace the Q13 evaporative emissions vent solenoid valve.
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