Diagnostic Test
- VERIFY THE 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 the DTC active at this time?
Yes
- Perform the U0100-87-Lost Communication with ECM/PCM diagnostic procedure. Refer to the DTC INDEX .
No
- Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to DIAGNOSIS AND TESTING .