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Home >> Chevrolet >> 2006 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 6.6L (LLY) - DTC P0401 To DTC P268A >> DTC P0650 >> Circuit/System Testing

Circuit/System Testing

  1. Inspect the fuse that supplies voltage to the MIL.
    • If the fuse is open test all spiced ignition 1 voltage circuits and components for a short to ground.
  2. With the ignition ON, and the ECM harness disconnected, the MIL should be OFF.
    • If the MIL is ON, test the MIL control circuit for a short to ground, or a faulty IPC.
  3. With the ignition ON, the ECM harness disconnected, connect a fused 3-amp jumper wire to the MIL control circuit. Connecting and disconnecting the other end of the fused jumper wire to a ground will allow the MIL to turn ON and OFF.
    • If the MIL turns ON and OFF when the jumper is connected and disconnected from a ground, replace the ECM.
    • If the fuse in the 3-amp fused jumper opens, test the MIL control circuit for a short to voltage.
    • If the MIL does not illuminate, test the MIL control and the MIL supply voltage circuits for an open.
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