Check CAN Bus Line For Short to GND

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Check CAN Bus Line for Short to GND

Check CAN Bus Line for Short to GND

DESCRIPTION

A short to GND is suspected in the CAN bus line when there is continuity between terminals 4 (CG) and 6 (CANH) or terminals 4 (CG) and 14 (CANL) of the DLC3.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN BUS LINE FOR SHORT TO GND (DLC3 SUB BUS LINE)




(a) Disconnect the DLC3 sub bus line connector (J50) from the CAN J/C.

NOTICE:
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.




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






NG -- REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
OK -- Continue to next step.

2. CONNECT CONNECTOR
(a) Reconnect the DLC3 sub bus line connector (J50) to the CAN J/C.
NEXT -- Continue to next step.

3. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE)




(a) Disconnect the skid control ECU sub bus line connector (J47) from the CAN J/C.

NOTICE:
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.




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





OK -- CONNECT CONNECTOR

NG -- Continue to next step.

4. CONNECT CONNECTOR
(a) Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.
NEXT -- Continue to next step.

5. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE)




(a) Disconnect the yaw rate sensor sub bus line connector (J48) from the CAN J/C.

NOTICE:
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.




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





OK -- CONNECT CONNECTOR

NG -- Continue to next step.

6. CONNECT CONNECTOR
(a) Reconnect the yaw rate sensor sub bus line connector (J48) to the CAN J/C.
NEXT -- Continue to next step.

7. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING ANGLE SENSOR SUB BUS LINE)




(a) Disconnect the steering angle sensor sub bus line connector (J49) from the CAN J/C.

NOTICE:
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.




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





OK -- CONNECT CONNECTOR

NG -- Continue to next step.

8. CONNECT CONNECTOR
(a) Reconnect the steering angle sensor sub bus line connector (J49) to the CAN J/C.
NEXT -- Continue to next step.

9. CHECK CAN BUS LINE FOR SHORT TO GND (ECM MAIN BUS LINE)




(a) Disconnect the ECM main bus line connector (J51) from the CAN J/C.

NOTICE:
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.




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





OK -- CONNECT CONNECTOR

NG -- REPLACE CAN J/C
10. CONNECT CONNECTOR
(a) Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.
NEXT -- Continue to next step.

11. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE)




(a) Disconnect the skid control ECU connector (S28).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





OK -- REPLACE MASTER CYLINDER SOLENOID

NG -- REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
12. CONNECT CONNECTOR
(a) Reconnect the yaw rate sensor sub bus line connector (J48) to the CAN J/C.
NEXT -- Continue to next step.

13. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE)




(a) Disconnect the yaw rate sensor connector (Y1).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





OK -- REPLACE YAW RATE SENSOR

NG -- REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
14. CONNECT CONNECTOR
(a) Reconnect the steering angle sub bus line connector (J49) to the CAN J/C.
NEXT -- Continue to next step.

15. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING ANGLE SENSOR SUB BUS LINE)




(a) Disconnect the steering angle sensor connector (S11).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





OK -- REPLACE STEERING ANGLE SENSOR

NG -- REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
16. CONNECT CONNECTOR
(a) Reconnect the ECM main bus line connector (J51) to the CAN J/C.
NEXT -- Continue to next step.

17. CHECK CAN BUS LINE FOR SHORT TO GND (ECM MAIN BUS LINE)




(a) Disconnect the ECM connector (E7).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





OK -- REPLACE ECM

NG -- REPAIR OR REPLACE ECM MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L)