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Circuit/System Testing

  1. Ignition ON, verify that the 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 X1 at the electronic 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 the MIL control circuit and ground.
    • ECM terminal X1-27 for RPO LE5
    • ECM terminal X1-12 for RPO LAT
    • 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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