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 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 wire, between the CAN bus lines, to +B, or to GND.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
* After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
HINT
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
PROCEDURE
1. CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT)
(a) Turn the ignition switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG-B -- CHECK CAN BUS LINES FOR SHORT CIRCUIT Check CAN Bus Lines for Short Circuit
NG-A -- CHECK CAN MAIN WIRE FOR DISCONNECTION CAN Main Wire for Disconnection
OK -- Continue to next step.
2. CHECK CAN BUS LINE FOR SHORT TO +B
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- CHECK CAN BUS LINE FOR SHORT TO +B Check CAN Bus Line for Short to +B
OK -- Continue to next step.
3. CHECK CAN BUS LINE FOR SHORT TO GND
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- CHECK CAN BUS LINE FOR SHORT TO GND Check CAN Bus Line for Short to GND
OK -- HOW TO PROCEED WITH TROUBLESHOOTING How to Proceed With Troubleshooting