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 commuication error and sets DTC P0600 if communication with other engine 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 | |
Case1 | DTC Strategy | ● CAN message transfer incorrect | ● Open or short in CAN line ● Contact resistance in connectors ● Faulty PCM |
Enable Conditions | ● Battery voltage ＞10V ● Engine speed ＞ Approx. 30 rpm | ||
Threshold Value | ● CAN message is incorrect | ||
Diagnostic Time | ● 20 wrong messages | ||
Case2 | DTC Strategy | ● No message from control module | |
Enable Conditions | ● Battery voltage ＞10V ● Engine speed ＞ Approx. 30 rpm | ||
Threshold Value | ● Time exceeded without message = 1 sec. | ||
Diagnostic Time | ● 1 sec. |
