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 DIAGNOSIS AND TESTING and perform the U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE diagnostic procedure.

   No 

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