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Circuit/System Testing

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure the voltage at the battery terminals and compare it with the Ignition 1 Signal parameter in the ECM data list. Verify that battery and ignition 1 signal readings do not differ more than 0.5 volt.
    • If greater than 0.5 volt, test the ignition 1 ground circuits of the ECM for high resistance or replace the ECM.
  2. Go to Charging System Test .
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