Pinpoint Test As: Abs Module Communication Concern With FCIM
Normal Operation and Fault Conditions
With the ignition ON, the FCIM sends messages to the GWM over the MS-CAN, The GWM relays these messages to the ABS module over the HS-CAN2. 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 FCIM 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 FCIM, refer to Network Message Chart .
The hill descent control switch is part of the FCIM. When the hill descent control switch is touched, the FCIM sends a message to the GWM over the HS-CAN3. The GWM relays the message 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) or if the message contains invalid information, the ABS module sets a DTC.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS U0256:00 | Lost Communication With Front Controls Interface Module 'A': No Sub Type Information | This DTC sets when the ABS module does not receive any messages from the FCIM within the allowed time. |
| ABS U0557:00 | Invalid Data Received From Front Controls Interface Module 'A': No Sub Type Information | This DTC sets when the ABS module receives messages from the FCIM, but the messages contain invalid data. |
Possible Sources
- Network communication concern
- GWM
- FCIM