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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 252 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - DTC P0230 To DTC P0690) >> DTC P0650 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition ON, verify that the instrument panel cluster (IPC) warning indicators are illuminated.
    • If the IPC warning indicators are not illuminated, test the ignition circuit for a sort to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the IPC.
  2. Ignition OFF, disconnect connector X1 at the ECM.
  3. Ignition ON, verify the MIL is not illuminated.
    • If the MIL is illuminated, inspect the MIL control circuit for a short to ground. If the circuit tests normal, replace the IPC.
  4. Ignition ON, verify that the MIL illuminates with a 3A fused jumper between the MIL control circuit, ECM terminal X1-68, and ground.
    • If the MIL does not illuminate, test the MIL control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
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