A communication line exists between the Engine Control Module(PCM) 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 PCM. 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 PCM and ABS control module use CAN lines.
The PCM 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 PCM
Faulty TCM
Enable Conditions
Battery voltage > 10V
Engine speed > 32rpm
Delay time >0.5 sec.
Threshold Value
No message from TCM for 0.1 Seconds
Diagnostic Time
1.5 sec.
MIL On Condition
2 Drive Cycles
Fig.1) Normal waveform with ignition ON