Short to B+ in CAN Bus Line

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

Short to B+ in CAN Bus Line

DESCRIPTION

There may be a short circuit between the CAN bus line and B+ when there is resistance between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN BUS LINES FOR SHORT TO B+ (DLC3 SUB BUS LINE)




(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the J25 CAN junction connector.




(c) 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 TO B+ (ECM MAIN BUS LINE)




(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the E6 ECM connector.




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






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




(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the J25 CAN junction connector.




(c) Disconnect the E6 ECM connector.
(d) 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 TO B+ (TRANSLATE ECU MAIN BUS LINE)




(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the T28 translate ECU connector.




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






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




(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the J25 CAN junction connector.




(c) Disconnect the T28 translate ECU connector.
(d) 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 TO B+ (GATEWAY ECU SUB BUS LINE)




(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the G3 gateway ECU connector.




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






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




(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the J25 CAN junction connector.




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






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