Open in CAN Main Bus Line

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Open in CAN Main Bus Line

Open in CAN Main Bus Line

DESCRIPTION

There may be an open circuit in the CAN main bus line and / or the DLC3 sub bus line when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ohms or higher.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DLC3




(a) Measure the resistance of the DLC3.
Result:





NOTE:
When the measured value is 132 Ohms or higher and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of the DLC3 sub bus line. For that reason, troubleshooting should be performed again from "HOW TO PROCEED WITH TROUBLESHOOTING" How to Proceed With Troubleshooting after repairing the trouble area.

B -- REPAIR OR REPLACE DLC3 SUB BUS LINE AND CONNECTOR (CANH, CANL)
A -- Continue to next step.
2. CHECK CAN MAIN BUS LINE FOR DISCONNECTION (FOR ECM)




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






NG -- CHECK ECM
OK -- Continue to next step.
3. CHECK CAN MAIN BUS LINE FOR DISCONNECTION (FOR TRANSLATE ECU)




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






NG -- CHECK TRANSLATE ECU
OK -- REPAIR OR REPLACE CAN JUNCTION CONNECTOR
4. CHECK ECM




(a) Disconnect the E6 ECM connector.
(b) Measure the resistance of the ECM.
Standard resistance:






NG -- REPLACE ECM
OK -- REPAIR OR REPLACE ECM MAIN BUS LINE AND CONNECTOR
5. CHECK TRANSLATE ECU




(a) Disconnect the T28 translate ECU connector.
(b) Measure the resistance of the translate ECU.
Standard resistance:






NG -- REPLACE TRANSLATE ECU
OK -- REPAIR OR REPLACE TRANSLATE ECU MAIN BUS LINE AND CONNECTOR