Circuit/System Verification
- Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V.
- If the battery voltage is not within the specified range, refer to Charging System Test .
- Observe the scan tool ECM Ignition 1 Signal parameter. Verify that the scan tool ECM Battery Voltage parameter is within 2 V of the battery terminal voltage.