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 TCM use CAN lines.
The ECM sets DTC U0101 if ECM detects that communication time via CAN exceeds threshold value.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Missing messages TCU | ● Open or short in CAN line ● Contact resistance in connectors |
Enable Conditions | ● Battery voltage 〉10V ● Engine speed 〉 Approx. 260 rpm | |
Threshold Value | ● Time exceeded without message = 0.5 sec. | |
Diagnostic Time | ● 1 sec. |
