Check CAN Bus Line For Short to +B

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Check CAN Bus Line for Short to +B

Check CAN Bus Line for Short to +B

DESCRIPTION

A short to +B is suspected in the CAN bus line when there is continuity between terminals 16 (BAT) and 6 (CANH) or terminals 16 (BAT) and 14 (CANL) of the DLC3.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN BUS LINE FOR SHORT TO +B (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 +B (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 +B (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 +B (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 +B (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)
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 +B (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 +B (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 sensor sub bus line connector (J49) to the CAN J/C.
NEXT -- Continue to next step.

15. CHECK CAN BUS LINE FOR SHORT TO +B (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)