If the ETACS-ECU receives a vehicle speed sensor failure signal from ASC-ECU, the ECU
sets diagnosis code No. U1150.
PROBABLE CAUSES
Malfunction of the vehicle speed sensor
Malfunction of the ASC-ECU
Malfunction of the ETACS-ECU
Malfunction of the CAN bus
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 2
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 5.
STEP 2. Check the M.U.T.-III Diagnosis code for other systems
Check that the ASC-ECU set a diagnosis code.
Q.
Is the diagnosis code set?
Diagnose the ASC-ECU. Refer to GROUP 35C - Troubleshooting .
Go to Step 3
STEP 3. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the ETACS-ECU.
(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?
Replace the ASC-ECU. After replacing the ECU, carry out the CAN bus diagnostics. Then
go to Step 4.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the ASC-ECU and the ETACS-ECU (Refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions ).
STEP 4. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the ETACS-ECU.
(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 not reset.
Q.
Is the diagnosis code set?
Replace the ETACS-ECU and register the ID codes (Refer to ).
After replacing the ECU, carry out the CAN bus diagnostics. Then go to Step 5.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the ASC-ECU and the ETACS-ECU (Refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions ).
STEP 5. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set to the ETACS-ECU.
(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.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting 
).
On completion, go to Step 5.