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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 774 (Engine Controls And Fuel - 2.0L - Troubleshooting & Diagnosis) >> Malfunction Indicator Lamp (MIL) Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  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 X1 at the 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 X1-54 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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