Pinpoint Test BM: Abs (Anti-Lock Brake System) Module Communication Concern With The ATCM (All Terrain Control Module)

Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition ON, the ATCM sends messages to the ABS module over the HS-CAN2. If the ABS module does not receive these messages within a certain time frame (usually less than 1 second), the ABS module sets one or more Diagnostic Trouble Codes (DTCs). This can be due to a ATCM failure, a circuit failure on the CAN or an excessive load on the network. For information on the messages sent to the ABS module by the ATCM, REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
ABS U0138:00	Lost Communication with All Terrain Control Module: No Sub Type Information	Sets when the ABS module does not receive any messages from the ATCM.
ABS U0138:86	Lost Communication with All Terrain Control Module: Signal Invalid	Sets when the ABS module is configured for one type of selectable drive mode switch and the ABS module receives a message for a different type of selectable drive mode switch.
ABS U0138:87	Lost Communication with All Terrain Control Module: Missing Message	Sets when the ABS module does not receive the 4x4 switch data message in the allotted time.

Possible Sources

Network communication concern
ATCM