No PCM Messages Received

Possible Causes:

Testing

With the DRBIII(R), erase DTCs. Cycle the ignition and wait approximately one minute. With the DRBIII(R), read DTCs. Did this DTC reset? If yes, go to next step. If no, the condition is not present at this time. Monitor DRBIII(R) parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness and connector terminals.
Turn the ignition on. With the DRBIII(R), enter Body Computer, System Tests, then PCM Monitor. Does the DRBIII(R) display PCM Active on the Bus? If yes, replace the Compass Mini-Trip Computer. See OVERHEAD CONSOLES - LIBERTY for REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST . If no, refer to COMMUNICATION in DIAGNOSTIC TROUBLE CODE IDENTIFICATION or SYMPTOM IDENTIFICATION tables for the related symptom(s).