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 P1602 if communication with other electronic control devices (e.g. A/T) via CAN is impossible or PCM detects that communication time via CAN exceeds threshold value.
Item
Detecting Condition
Possible Cause
DTC Strategy
? No message from control module
? Open or short circuit in CAN line
? Contact resistance in connectors
Enable Conditions
? Battery voltage >10V
? Engine speed > Approx. 30 rpm
Threshold Value
? Time exceeded without message = 1 sec.
Diagnostic Time
? 1 sec.