Code No. U1128 Meter (CAN message)



caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION


ASC-ECU receives signal from the combination meter via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS


When the signal from the combination meter shows rejection, ASC-ECU determines that the malfunction has occurred and sets this diagnosis.

PROBABLE CAUSES



  • Malfunction of combination meter assembly
  • Malfunction of ASC-ECU

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines


Q. Is the diagnosis code No. U1128 set?

Go to Step 3.
This diagnosis is complete.

STEP 3. M.U.T.-III Diagnosis code of other systems


Check if a diagnosis code is set in the combination meter.

Q. Is the diagnosis code set?

Diagnose the combination meter. Then go to Step 5.
Go to Step 4.

STEP 4. M.U.T.-III diagnosis code


Check if the diagnosis code other than code No. U1128 is set from ASC-ECU.

Q. Is the diagnosis code other than code No. U1128 set?

Troubleshoot for the relevant diagnosis code (Refer to ).
Replace the combination meter (Refer to GROUP 54A - combination meter assembly ). Then go to Step 5.

STEP 5. Diagnosis code recheck


(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.

Q. Is the diagnosis code No. U1128 set?

Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 6.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 6. Diagnosis code recheck


(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.

Q. Is the diagnosis code No. U1128 set?

Return to Step 1.
This diagnosis is complete.