Pinpoint Test As: Abs (Anti-Lock Brake System) Module Communication Concern With FCIM (Front Controls Interface Module)
Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.
Normal Operation and Fault Conditions
With the ignition ON, the FCIM sends messages to the ABS module through the GWM over the MS-CAN. If the ABS module does not receive these messages within a certain time frame (usually less than 1 second), the module sets a DTC. For information on the messages sent to the ABS module by the FCIM, 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 U0256:00 | Lost Communication With Front Controls Interface Module 'A': No Sub Type Information | Sets in continuous memory and on-demand when the ABS module is missing any of the FCIM messages. This can be due to a FCIM failure, a circuit failure on the MS-CAN or an excessive load on the network. |
| ABS U0557:86 | Invalid Data Received From Front Controls Interface Module 'A': Signal Invalid | This DTC sets if the auto hold switch status message from the FCIM contains 'invalid' or 'faulted' instead of the actual switch state. This can be due to a FCIM failure, a circuit failure on the MS-CAN or an excessive load on the network. |
Possible Sources
- Network communication concern
- FCIM
- GWM