Diagnostic Test

ACTIVE DTC 

1. Ignition on, engine not running.
2. With the scan tool, select view DTCs.

   Is the DTC Active at this time?

   Yes 

   • Refer to DTC INDEX and perform the U0100-LOST COMMUNICATION WITH ECM/PCM diagnostic procedure.

   No 

   • Refer to STORED LOST COMMUNICATION DTCS and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.