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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 P0443 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the EVAP canister purge solenoid valve.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is not open, test or replace the EVAP canister purge solenoid.
  3. Verify that a test lamp does not illuminate between the ignition circuit terminal A and the control circuit terminal B.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Remove the test lamp, and install a 3 A fused jumper wire between the control circuit terminal B and the ignition circuit terminal A. Command the purge solenoid to 50 percent with a scan tool. Verify the scan tool purge solenoid Ckt. Short Volts Test Status Parameter is Fault.
    • If not the specified value and, the circuit tests normal, replace the ECM.
  5. If all circuits test normal, replace the purge solenoid valve.
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