Pinpoint Test Av: Abs (Anti-Lock Brake System) Module Communication Concern With The TCCM (Transfer Case Control Module)

Refer to Horn/Cigar Lighter for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition ON, the TCCM module sends messages to the ABS module over the HS-CAN2 through the GWM. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a TCCM module failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the TCCM module, refer to Network Message Charts .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
ABS U0102:00	Lost Communication with Transfer Case Control Module: No Sub Type Information	Sets when the ABS module does not receive any transmission messages from the TCCM.
ABS U0403:00	Invalid Data Received From Transfer Case Control Module: No Sub Type Information	Sets when the ABS module does not receive any transmission messages from the TCCM.

Possible Sources

Network communication concern
GWM
TCCM module

AV1 CHECK CAN (CONTROLLER AREA NETWORK) DATA

A DTC has been set which has the following description:
- Invalid Data Received From TCCM module

Ignition ON.

Clear the ABS DTCs.

Ignition OFF.

Ignition ON.

Wait at least 1 minute.

Using a diagnostic scan tool, retrieve all DTCs from the ABS module. NOTE: DTCs may be displayed from previous diagnostic actions.

Did the DTCs return?

Yes	Invalid or Missing CAN Data From the TCCM. Check the CAN bus and terminating resistor (60 ohm) at the OBD connector. Check CAN bus circuit. Check for other failures in the TCCM module. Notice: Do not replace the ABS module.

No	Return the vehicle to the customer. If the fault reoccurs inform the customer to note any relevant conditions at the time of the fault. The test is now exiting.