If DTC U1731 is stored, diagnose the CAN bus lines.
When replacing the ECU, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If the necessary data cannot be received from engine control module via CAN bus line during the engine starting certification with engine control module, OSS-ECU determines that a problem has occurred, and stores DTC B1731. At the same time, OSS-ECU displays the immobilizer certification system inspection warning screen to the multi information display of the combination meter.
DTC SET CONDITION
Check Conditions
At engine starting certification
Judgment Criterion
At the engine starting certification with engine control module, necessary data cannot be received from engine control module via CAN bus line.
TROUBLESHOOTING HINTS
Malfunction of the CAN bus line
Malfunction of engine control module
Malfunction of OSS-ECU
DIAGNOSIS
1. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
2. Engine control module diagnostic trouble code check
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