Circuit/System Verification

2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2012 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that no starter relay, immobilizer, or automatic transmission DTCs are set that would cause the ECM to disable starting.
  2. Ignition ON, observe the scan tool ECM Ignition 1 Signal parameter with a scan tool. The reading should be greater than 10.0 Volts.
    • If less than the specified value, test the ECM IGN fuse, the RUN/CRNK relay, and the ignition voltage circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, transmission in Park, observe the scan tool ECM PNP Switch parameter with a scan tool. The reading should be Park/Neutral.
    • If the scan tool PNP Switch parameter is not Park/Neutral, refer to PNP Switch Circuit Malfunction.
  4. Command the Starter Relay ON with the scan tool, or turn the ignition switch to the START position. The starter solenoid should engage and the engine should crank.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.