CAN Bus Line

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: CAN Bus Line

CAN Bus Line

DESCRIPTION

When any DTC of the CAN communication system is output, first measure the resistance between the terminals of the DLC3 to confirm the trouble area.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- Turn the power switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
- After the power switch is turned off, check that the key reminder warning system and lighting system are not operating.
- Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
HINT: Operating the power switch, any other switches, or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

PROCEDURE

1. CHECK CAN BUS WIRE (MAIN BUS WIRE FOR DISCONNECTION, BUS WIRES FOR SHORT CIRCUIT)




(a) Measure the resistance according to the value(s) in the table below.

Standard resistance:





Result:





C -- SHORT IN CAN BUS WIRES
B -- OPEN IN CAN BUS MAIN WIRE
A -- Continue to next step.
2. CHECK CAN BUS WIRE (SHORT TO B+ IN CAN BUS WIRE)





(a) Measure the resistance according to the value(s) in the table below.

Standard resistance:





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





(a) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- SHORT TO GND IN CAN BUS WIRE
OK -- GO TO "HOW TO PROCEED WITH TROUBLESHOOTING"