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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac Montana SV6, 2007 Chevrolet Uplander, and 2007 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure the voltage at the battery terminals.
  2. With scan tool, read the ignition voltage in the EBCM data list. Verify that battery terminal voltage and ignition voltage readings do not differ more than 1-volt.
    • If more than 1-volt test the ignition voltage and ground circuits of the EBCM for high resistance or replace the EBCM.
  3. Go to Charging System Test .
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