Diagnostic Test

VERIFY THE DTC IS ACTIVE 

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

   Is the DTC Active at this time?

   Yes 

   • Refer to the DTC INDEX article and perform the appropriate diagnostic procedure.

   No 

   • Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCs diagnostic procedure.