Diagnostic Test

VERIFY IF THE DTC IS ACTIVE

NOTE:

Make sure the battery is fully charged before performing any diagnostic procedure.

With the scan tool, refer to the Network Review Screen to display a high level view of the vehicle communication network. Modules shown in red are problem areas.

Always diagnose any Body Control Module (BCM) DTCs first before proceeding.

Turn the ignition on.
Using the scan tool, read DTCs.
Does the scan tool display this DTC as active?

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