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Circuit/System Testing

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. 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 0.8 volts.
    • If more than 0.8 volts, test the Ignition 1 and ground circuits of the ECM for an open, high resistance or replace the ECM.
  2. Go to Charging System Test .
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