Transmission Control System
U0121 LOST COMMUNICATION WITH ABSWiring Diagram:
When Monitored:
Every 7 msec with:
1) Engine speed greater than 500 RPM.
2) Battery voltage between 10 and 16 volts.
Set Condition
CAN C bus messages are not received for 10 seconds.
Theory of Operation
The NGC controller communicates over the CAN C bus. The transmission controller continuously monitors bus activity. The CAN C bus is also used to communicate transmission MIL status to the Engine Controller. If the Engine Controller is unable to communicate with the Transmission Controller, a DTC will set and the Engine Controller will illuminate the MIL.