Open in One Side of CAN Sub Bus Line

CAN COMMUNICATION SYSTEM: Open in One Side of CAN Sub Bus Line

Open in One Side of CAN Sub Bus Line

DESCRIPTION

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






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- Perform the following inspections for the ECUs (sensors) that are not displayed on the Techstream first. If a malfunction is still not able to be identified, perform the following inspections for all other ECUs (sensors) connected to the CAN communication system.
- The basic inspection procedures that can be used for all related ECUs in common are shown below.
"ECU A" represents the following: HV control ECU, steering sensor, yaw rate sensor, skid control ECU, network gateway ECU, power steering ECU, distance control ECU.

PROCEDURE

1. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE





(a) Disconnect the connector with terminals CANH and CANL of the ECU A (SENSORS).
(b) Using the Techstream, select "CAN Bus Check" from the "System Select".
Result:






B -- CONNECT THE ECU A CONNECTOR TO THE ECU (SENSOR) AND INSPECT OTHER ECUS (SENSORS) TO MEET "STANDARD A"
A -- Continue to next step.
2. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE





(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE ECU A SUB BUS LINE OR CONNECTOR
OK -- REPLACE ECU A (SENSOR A)