Short to B+ in CAN Bus Line

CAN COMMUNICATION SYSTEM: Short to B+ in CAN Bus Line

Short to B+ in CAN Bus Line

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 LINES FOR SHORT TO +B (DLC3 SUB BUS LINE)





(a) Disconnect the DLC3 sub bus line connector (J9) from the CAN J/C.

- 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 BRANCH WIRE OR CONNECTOR (CAN-H,CAN-L)
OK -- Continue to next step.
2. CONNECT CONNECTOR
(a) Reconnect the DLC3 sub bus line connector (J9) to the CAN J/C.
NEXT -- Continue to next step.
3. CHECK CAN BUS LINES FOR SHORT TO +B (SKID CONTROL ECU SUB BUS LINE)





(a) Disconnect the skid control ECU sub bus line connector (J6) from the CAN J/C.

- 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 (J6) to the CAN J/C.
NEXT -- Continue to next step.
5. CHECK CAN BUS LINES FOR SHORT TO +B (YAW RATE SENSOR SUB BUS LINE)





(a) Disconnect the yaw rate sensor sub bus line connector (J7) from the CAN J/C.

- 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 (J7) to CAN J/C.
NEXT -- Continue to next step.
7. CHECK CAN BUS LINES FOR SHORT TO +B (STEERING ANGLE SENSOR SUB BUS LINE)





(a) Disconnect the steering angle sensor sub bus line connector (J8) from the CAN J/C.

- 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 (J8) to the CAN J/C.
NEXT -- Continue to next step.
9. CHECK CAN BUS LINES FOR SHORT TO +B (ECM MAIN BUS LINE)
(a) Disconnect the ECM sub bus line 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 (J6) to the CAN J/C.
NEXT -- Continue to next step.
11. CHECK CAN BUS LINES FOR SHORT TO +B (SKID CONTROL ECU SUB BUS LINE)
(a) Disconnect the skid control ECU connector (S1).





(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 BRANCH WIRE OR CONNECTOR (CAN-H,CAN-L)
12. CONNECT CONNECTOR
(a) Reconnect the yaw rate sensor sub bus line connector (J7) to the CAN J/C.
NEXT -- Continue to next step.
13. CHECK CAN BUS LINES 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 CONNECTOR (CAN-H,CAN-L)
14. CONNECT CONNECTOR
(a) Reconnect the steering angle sensor sub bus line connector (J8) to the CAN J/C.
NEXT -- Continue to next step.
15. CHECK CAN BUS LINES FOR SHORT TO +B (STEERING SENSOR SUB BUS LINE)
(a) Disconnect the steering angle sensor connector (S9).





(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 BRANCH WIRE OR CONNECTOR (CAN-H,CAN-L)