|Detection Item||Symptom||Trouble Area|
|ECM Communication Stop Mode||
Either condition is met:
Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Click here.
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 Click here.
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch), wait at least 11.84 seconds and then drive the vehicle at a speed of 20 km/h (12 mph) or more for 5 minutes or more. Check that the warning light remains off after turning off following the initial light check.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.
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.
CHECK FOR OPEN IN CAN BUS LINES (ECM MAIN LINE)
Disconnect the cable from the negative (-) battery terminal.
Front view of wire harness connector
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM MAIN LINE)
CHECK ECM POWER SOURCE CIRCUIT
Check the ECM power source circuit.
for 2GR-FE: Click here
for 2AR-FE: Click here
REPLACE ECM Click here
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)