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 PCM determines CAN commuication error and sets DTC U0001 if communication with other control devices (e.g. ABS) via CAN is impossible or PCM detects that communication time via CAN exceeds threshold value.
Item
Detecting Condition
Possible Cause
DTC Strategy
Check CAN message transfer status
Open or short in CAN line
Poor connection or damaged harness
Faulty PCM
Enable Conditions
Battery voltage >10V
Delay time >0.5 sec.
Threshold Value
20 wrong messages received by PCM
Diagnostic Time
-
Mil On Condition
2 Driving Cycles