Code No.U1121 T/M (CAN message)


JUDGEMENT CRITERIA



COMMENTS ON TROUBLE SYMPTOM


The M.U.T.-III shows a diagnosis code status as active.
  • The sensor system of the EV-ECU may be defective.
The M.U.T.-III shows a diagnosis code status as stored.
  • Carry out diagnosis with particular emphasis on wiring harness and connector failures between EV-ECU and sensor.For diagnosis procedures, refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Treat Past Trouble .
    note For a past trouble, you cannot find it by the M.U.T.-III CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions and check the CAN bus lines. You can narrow down the probable cause of the trouble by referring to the diagnosis code, which is set regarding the CAN communication-linked ECUs (Refer to GROUP 54C - CAN Bus Line Diagnostic Flow ).

PROBABLE CAUSE



  • Malfunction of wiring harness or connector

DIAGNOSIS PROCEDURE


STEP 1. Check the M.U.T.-III Diagnosis code for other systems



Q. Is the diagnosis code set?





STEP 2. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is reset.

Q. Is the diagnosis code set?