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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the Run/Crank relay.
  2. Ignition ON, verify a test lamp does not illuminate between the Run/Crank voltage circuit terminal and ground.
    • If the test lamp illuminates, test the ignition 1 voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM
  3. Reconnect the Run/Crank relay, and disconnect the harness connector of the ECM.
  4. Verify a test lamp does not illuminate between the Run/Crank voltage circuit terminal and ground.
    • If the test lamp illuminates, test the Run/Crank voltage circuit for a short to voltage. If the circuit tests normal, replace the Run/Crank relay.
  5. If all circuits test normal, replace the ECM.
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