Circuit DescriptionThe predictive cruise control system sends commands to the ECM via the vehicle J1939 network. Predictive Cruise Control dynamically adjust the vehicle speed profile while the vehicle is operating in cruise control. The vehicle speed profile is optimized for fuel economy based on the upcoming road grade.

Component LocationThe SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options.

Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault CodesThe Engine Control Module (ECM) did not receive a message from a multiplexed device.

Action Taken When the Fault Code is ActiveThe ECM logs the fault code immediately when the diagnostic runs and fails.The predictive cruise control will not operate.Conditions for Clearing the Fault CodeTo validate the repair, perform a key cycle, start the engine and let it idle for 2 minute.The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop TalkFor troubleshooting information on this fault code refer to the OEM service manual.

Possible Cause:1) ECM calibration