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Circuit/System Verification

WARNING: This page is about a different car, the 2007 Pontiac Solstice. However, it is still accessible from the selected car via links, so may be relevant.
  1. If the DTC is history, refer to Charging System Test 
  2. Start the engine, record the voltage at the battery terminals. Observe the Ignition 1 signal parameter in the ECM data list. Voltages should not differ by more than 1 volt.
    • If more than 1 volt, replace the ECM.
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