The combination meter receives vehicle speed and driving distance signals from the ASC-ECU
via CAN bus lines. If abnormal information is contained in these signals for one minute, diagnosis
code No. U1122 will be set.
COMMENTS ON TROUBLE SYMPTOM
The M.U.T.-III shows a diagnosis code status as active.
The sensor system of the ASC-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 ASC-ECU and the sensors. 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 CAUSES
Malfunction of wiring harness or connector
DIAGNOSIS PROCEDURE
STEP 1. Check the M.U.T.-III Diagnosis code for other
systems
Check that the ASC-ECU sets a diagnosis code.
Q.
Is the diagnosis code set?
Perform the troubleshooting for the ASC.Refer to GROUP 35C - Troubleshooting .
A poor connection, open circuit or other intermittent malfunction between the
ASC-ECU and the sensors. (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service
Points - How to Cope with Intermittent Malfunctions .)
Check the wiring harness and connectors, and then go to Step 2.
STEP 2. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set to the combination meter.
(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.
.
Perform the troubleshooting for the ASC.Refer to GROUP 35C - Troubleshooting 
A poor connection, open circuit or other intermittent malfunction between the
ASC-ECU and the sensors. (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service
Points - How to Cope with Intermittent Malfunctions 