Test M: No High Speed Controller Area Network (CAN) Communication
PINPOINT TEST M: NO HIGH SPEED CONTROLLER AREA NETWORK (CAN) COMMUNICATIONM1-M3:
M4-M5:
M6-M7:
M8-M9:
M10-M12:
M13-M18:
M19-M23:
M24:
Normal Operation
The high speed CAN has an unshielded twisted pair cable, circuits 1908 (WH) and 1909 (BK). The differential electronic module (DEM) (if equipped), the anti-lock brake system (ABS) module, the transmission control module (TCM) - 6-speed transaxle, the TCM - continuously variable transaxle (CVT), the instrument cluster, the powertrain control module (PCM) and the restraint control module (RCM) all use the high speed CAN. The high speed CAN is not designed to operate under single point fault conditions. If either circuit is shorted to voltage or the high speed CAN data plus is shorted to ground, module-to-module and module-to-tester communication is not possible. If the high speed CAN data minus is shorted to ground or an open exists on either bus line, module-to-module and module-to-tester communication is marginal at best. The high speed CAN bus may remain operational when one of the two termination resistors are not present. If the resistance is more than 5 ohms there is an open in one of the high speed CAN circuits, damage to the data link connector (DLC) C251, damage to one of the communications network module connectors, or damage to an in-line connector.
Possible Causes
- high speed CAN circuits 1908 (WH) and 1909 (BK) open, short to ground, or short to voltage
- DLC C251
- ABS module
- DEM (if equipped)
- instrument cluster
- PCM
- RCM
- TCM - 6-speed transaxle
- TCM - CVT