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Circuit/System Verification

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 volts
  2. Engine running, observe the scan tool ECM Ignition 1 signal parameter. The voltage should be between 12.5 and 15.0 volts.
    • If greater than specified value, replace the ECM.
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