Circuit/System Verification
- Ignition On. Measure and record the voltage at the battery terminals. Verify that the battery voltage is 11-17 volts. Repeat with the engine running.
- If the battery voltage is not within the specified range, go to Charging System Test .
- Engine running. Observe the scan tool Battery Voltage Signal parameter in the EBCM data list. Verify that the scan tool displays a value that is within 1 volt of the battery voltage recorded in step 1.
- If the scan tool parameter is not within the specified range, go to Circuit/System Testing .
- Go to Diagnostic Aids .