DTC Code | DTC Name |
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ECM Communication Stop Mode |
DESCRIPTION
Detection Item | Symptom | Trouble Area |
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ECM Communication Stop Mode | Either condition is met:
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CAUTION / NOTICE / HINT
Before measuring the resistance of the CAN bus, turn the power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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 power switch on (IG) and wait at least 20 seconds.
After the repair, perform CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed (Click here).
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.
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.
PROCEDURE
CHECK FOR OPEN IN CAN BUS LINES (ECM MAIN LINE)
Disconnect the cable from the negative (-) auxiliary battery terminal.
Disconnect the A22 ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
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*a | Front view of wire harness connector (to ECM) |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM MAIN LINE)
CHECK ECM POWER SOURCE CIRCUIT
Check the ECM power source circuit (Click here).
REPLACE ECM (Click here)
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)