Short in CAN Bus Lines

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Short in CAN Bus Lines

Short in CAN Bus Lines

DESCRIPTION

There may be a short circuit between the CAN bus lines when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ohms.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN BUS LINES FOR SHORT CIRCUIT (DLC3 SUB BUS LINE)




(a) Disconnect the J25 CAN junction connector.




(b) Measure the resistance of the DLC3.
Standard resistance:






NG -- REPAIR OR REPLACE DLC3 SUB BUS LINE AND CONNECTOR
OK -- Continue to next step.
2. CONNECT CONNECTOR
(a) Reconnect the J25 CAN junction connector.
NEXT -- Continue to next step.
3. CHECK CAN BUS LINES FOR SHORT CIRCUIT (ECM MAIN BUS LINE)
(a) Disconnect the E6 ECM connector.








(b) Measure the resistance of the DLC3.
Standard resistance:






OK -- REPLACE ECM
NG -- Continue to next step.
4. CHECK CAN BUS LINES FOR SHORT CIRCUIT (ECM MAIN BUS LINE)




(a) Disconnect the J25 CAN junction connector.
(b) Disconnect the E6 ECM connector.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE ECM MAIN BUS LINE AND CONNECTOR
OK -- Continue to next step.
5. CONNECT CONNECTOR
(a) Reconnect the J25 CAN junction connector.
(b) Reconnect the E6 ECM connector.
NEXT -- Continue to next step.
6. CHECK CAN BUS LINES FOR SHORT CIRCUIT (TRANSLATE ECU MAIN BUS LINE)




(a) Disconnect the T28 translate ECU connector.




(b) Measure the resistance of the DLC3.
Standard resistance:






OK -- REPLACE TRANSLATE ECU
NG -- Continue to next step.
7. CHECK CAN BUS LINES FOR SHORT CIRCUIT (TRANSLATE ECU MAIN BUS LINE)




(a) Disconnect the J25 CAN junction connector.




(b) Disconnect the T28 translate ECU connector.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE TRANSLATE ECU MAIN BUS LINE AND CONNECTOR
OK -- Continue to next step.
8. CONNECT CONNECTOR
(a) Reconnect the J25 CAN junction connector.
(b) Reconnect the T28 translate ECU connector.
NEXT -- Continue to next step.
9. CHECK CAN BUS LINES FOR SHORT CIRCUIT (GATEWAY ECU SUB BUS LINE)




(a) Disconnect the G3 gateway ECU connector.




(b) Measure the resistance of the DLC3.
Standard resistance:






OK -- REPLACE GATEWAY ECU
NG -- Continue to next step.
10. CHECK CAN BUS LINES FOR SHORT CIRCUIT (GATEWAY ECU SUB BUS LINE)




(a) Disconnect the J25 CAN junction connector.




(b) Disconnect the G3 gateway ECU connector.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- CHECK AND REPLACE GATEWAY ECU SUB BUS LINE AND CONNECTOR
OK -- REPAIR OR REPLACE CAN JUNCTION CONNECTOR