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 DTCs. For information on the messages sent to the ABS module by the FCIM, refer to the Description and Operation in the Anti-Lock Brake System (ABS) and Stability Control article.
DTC DESCRIPTION
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0256:00 | Lost Communication With Front Controls Interface Module 'A' | 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. |
| 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. |