CAN Bus Line

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: CAN Bus Line

CAN Bus Line

DESCRIPTION

When any DTC for the CAN communication system is output, first measure the resistance between the terminals of the DLC3 to specify the trouble area, and check that there is no short in the CAN main bus line, between the CAN bus lines, to B+, or to GND.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN BUS WIRE (MAIN BUS LINE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT)
(a) Disconnect the G3 gateway ECU connector.








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






NG-B -- CHECK FOR SHORT IN CAN BUS LINE
NG-A -- CHECK FOR OPEN IN CAN MAIN BUS LINE
OK -- Continue to next step.
2. CONNECT CONNECTOR
(a) Reconnect the G3 gateway ECU connector.
NEXT -- Continue to next step.
3. CHECK CAN BUS WIRE (FOR SHORT TO B+)




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






NG -- CHECK FOR SHORT TO B+ IN CAN BUS LINE
OK -- Continue to next step.
4. CHECK CAN BUS WIRE (FOR SHORT TO GND)




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






NG -- CHECK FOR SHORT TO GND IN CAN BUS LINE
OK -- HOW TO PROCEED WITH TROUBLESHOOTING