Short in CAN Bus Lines

CAN COMMUNICATION SYSTEM: Short in CAN Bus Lines

Short in CAN Bus Lines

DESCRIPTION

The CAN bus wires are considered to be shorted when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ohms.





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 SHORT IN CAN BUS WIRES (CAN BUS MAIN WIRE)
(a) Turn the ignition switch off.
(b) Disconnect the CAN junction connector.





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





Result:





C -- CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)
B -- CHECK FOR SHORT IN CAN BUS WIRES (ECM)
A -- Continue to next step.
2. CHECK FOR SHORT IN CAN BUS WIRES (CAN BUS BRANCH WIRE)
(a) Turn the ignition switch off.





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





Result:





D -- CHECK FOR SHORT IN CAN BUS WIRES (YAW RATE SENSOR)
C -- CHECK FOR SHORT IN CAN BUS WIRES (STEERING ANGLE SENSOR)
B -- REPAIR OR REPLACE DLC3 BRANCH WIRE
A -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN JUNCTION CONNECTOR)
3. CHECK FOR SHORT IN CAN BUS WIRES (ECM)





(a) Disconnect the ECM connector (E5).





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





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM
4. CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)





(a) Disconnect the skid control ECU connector.





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





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SKID CONTROL ECU WITH ACTUATOR
5. CHECK FOR SHORT IN CAN BUS WIRES (STEERING ANGLE SENSOR)





(a) Disconnect the steering angle sensor connector.





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





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE STEERING ANGLE SENSOR
6. CHECK FOR SHORT IN CAN BUS WIRES (YAW RATE SENSOR)





(a) Disconnect the yaw rate sensor connector.





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





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE YAW RATE AND ACCELERATION SENSOR