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Home >> Pontiac >> 2007 >> G6 Base, 2.4 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 2.4L - DTC P0420 To DTC P2544 >> DTC P0650 >> Circuit/System Testing
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Circuit/System Testing

  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 short 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 C1 at the electronic control module (ECM).
  3. Ignition ON, verify that 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 ECM terminal C1-12 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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