Normal Operation and Fault Conditions
The RCM supplies the stability/traction control system with the yaw rate, roll rate, lateral and longitudinal accelerometer over a dedicated CAN. If the RCM detects a fault with communications with the ABS module or dedicated CAN circuits, it sets DTC U0028:08 or U0028:88.
The RCM does not request the IPC to illuminate the air bag warning indicator if either DTC U0028:08 or U0028:88 is set.
DTC FAULT TRIGGER CONDITIONS
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0028:08 | Vehicle Communication Bus A: Bus Signal / Message Failures | A fault is indicated when the RCM does not receive dedicated CAN messages from the ABS module for 5 seconds. An open dedicated CAN circuit, incorrectly installed ABS module or loss of power and/or ground to the ABS module can set this DTC. |
| U0028:88 | Vehicle Communication Bus A: Bus Off | A fault is indicated when the RCM detects the dedicated CAN circuits are shorted to ground, shorted to voltage or shorted to each other. |