Check CAN Bus Line

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Check CAN Bus Line

Check CAN Bus Line

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR CAN BUS WIRE (MAIN BUS WIRE, BUS WIRES, DLC3 BRANCH WIRE)





(a) Turn the ignition switch to the LOCK position.
(b) Measure the resistance according to the values in the table below.
Result:






NG-B -- CHECK CAN BUS LINES FOR SHORT CIRCUIT
NG-A -- CHECK FOR CAN MAIN BUS LINE FOR DISCONNECTION
OK -- Continue to next step.
2. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CAN-H)





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






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





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






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





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






NG -- CHECK CAN BUS LINE (CAN-H) FOR SHORT TO GND
OK -- Continue to next step.
5. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN-L)





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






NG -- CHECK CAN BUS LINE (CAN-L) FOR SHORT TO GND
OK -- GO TO HOW TO PROCEED WITH TROUBLESHOOTING