Diagnostic Test

CHECK FOR AN ACTIVE DTC 

1. Turn the ignition on.
2. With the scan tool, read DTCs and record on the repair order.

   Is the DTC active or pending?

   Yes 

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

   No 

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