A communication line exists between the Engine Control Module(ECM) and the Transaxle Control Module(TCM). The communication is through a Control Area Network(CAN). Without CAN communication, an independent pin and wiring is needed to receive a sensor information from a ECM. The more information to be communicated, the more wirings is required. In case of CAN communication type, all the information need to be communicated among control modules such as ECM and ABS control module use CAN lines.
The ECM determines CAN communication error and sets DTC U0101 if no message received from TCM
Item
Detecting Condition
Possible Cause
DTC Strategy
? Check CAN message transfer status
? Poor connection or damaged harness
? Faulty ECM
Enable Conditions
? Battery voltage >10V
? Engine speed >32rpm
? Delay time >0.5 sec.
Threshold Value
? No message from TCM
Diagnostic Time
? 0.1 sec.
MIL On Condition
? 2 Driving Cycles