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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 >> Malfunction Indicator Lamp (MIL) Diagnosis >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the X1 harness connector at the K20 ECM.
  2. Ignition ON, the MIL should not illuminate.
    • If the MIL illuminates, test the MIL control circuit terminal 68 X1 for a short to ground. If the circuit tests normal, replace the P16 instrument panel cluster.
  3. Connect a 3 A fused jumper wire between the MIL control circuit terminal 68 X1 and ground. The MIL should illuminate.
    • If the MIL illuminates, replace the K20 ECM.
    • If the MIL does not illuminate, test the MIL control circuit for a short to voltage or an open/high resistance. If the MIL control circuit tests normal, test the instrument cluster ignition voltage circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the P16 instrument panel cluster/bulb.
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