Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting
using How to Proceed with Troubleshooting when CAN communication system related DTCs are output
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output
DTC check procedure: Turn the ignition switch to ON, and wait at least 60 seconds.
After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN
communication system are displayed .
Operating the ignition 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.
Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction
may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while
performing the inspection below may help determine the cause of the malfunction.
1. CHECK FOR OPEN IN CAN BUS LINES (DLC3 BRANCH LINE)
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Measure the resistance according to the value(s) in the table
D4-6 (CANH) -
Cable disconnected from
negative (-) battery terminal
108 to 132 Ω
Text in Illustration
hen the measured value is 133 Ω or higher and a CAN
communication system DTC is output, there may be a fault
besides disconnection of the DLC3 branch line. For that reason,
troubleshooting should be performed again from How to Proceed
with Troubleshooting after repairing the trouble area
REPAIR OR REPLACE CAN BRANCH LINE
CONNECTED TO DLC3