Diagnostic Test

VERIFY DTC IS ACTIVE

NOTE:

Make sure the IOD fuse is installed and the battery is fully charged before proceeding.

Turn the ignition on.
With the scan tool, read the active DTCs.
Is this DTC active?

Yes
- Refer to DIAGNOSIS AND TESTING and perform the U0100-Lost Communication with ECM/PCM diagnostic procedure.
No
- Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure.