Open in One Side of CAN Branch Line

CAN COMMUNICATION SYSTEM: Open in One Side of CAN Branch Line

Open in One Side of CAN Branch Line

DESCRIPTION

If 2 or more ECUs and/or sensors do not appear on the Techstream "Communication Bus Check" screen, one side of the CAN branch wire may be open. (One side of the CAN-H [branch wire] / CAN-L [branch wire] of the ECU and/or sensor is open.)





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: Turn the ignition switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.

PROCEDURE

1. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE
(a) Using Techstream, select and perform "Communication Bus Check" (Diagnosis System). [*1]
(b) Disconnect the connectors from the ECUs or sensors that are not displayed on the screen. [*2]
(c) Check that only the ECUs and sensors from which the connectors were disconnected in the previous step are not displayed on the "Communication Bus Check" screen. [*3]

HINT: If any ECUs or sensors, other than those from which the connectors were disconnected in the previous step, are not displayed on the "Communication Bus Check" screen, reconnect the disconnected connectors and repeat the procedures [*1], [*2], and [*3].

(d) Perform the communication stop mode check for the ECUs and sensors which correspond to the disconnected connectors (Symptom Related Diagnostic Procedures).
NEXT -- GO TO CORRESPONDING COMMUNICATION STOP MODE