U1016 Loss of PCM Communications - ABS

DTC U1016: Loss Of PCM Communications:

DTC U1016 Schematic:

CIRCUIT DESCRIPTION
The Class 2 serial data line allows all the modules on the line to transmit information to each other as needed. Each module is assigned an ID and all the information sent out on the line is assigned a priority by which it is received.

CONDITION FOR SETTING THE DTC
The Diagnostic Trouble Code (DTC) can be set any time the ignition is in the "RUN" position, and the Powertrain Control Module (PCM) does not communicate with the other modules on the class 2 data link for 7 seconds.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, TCS is disabled and the TRACTION OFF indicator lamp is turned ON. ABS remains functional.

CONDITIONS FOR CLEARING THE DTC
Condition for DTC is no longer present and scan tool clear function is used. Fifty start cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. An intermittent malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.