If the diagnosis
code No. U1190 is set, diagnose the CAN bus lines.
When replacing the ECU, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
When the signal from the ETACS-ECU cannot be received, OSS-ECU sets the diagnosis code No.U1190.
JUDGEMENT CRITERIA
Check Conditions
When all the following conditions are met.
Power supply mode: ON
ETACS-ECU system voltage is at 10 to 16 V.
Judgment Criterion
After the following condition is met, 5,000 ms or more have elapsed.
CAN signal from the ETACS-ECU cannot be received.
PROBABLE CAUSES
Malfunction of the CAN bus line
Malfunction of ETACS-ECU
Malfunction of OSS-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 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set to the ETACS-ECU.
Q.
Is the diagnosis code set?
Diagnose the ETACS-ECU (Refer to GROUP 54A, Troubleshooting ).
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set to the SRS-ECU.
Q.
Is the diagnosis code set?
Replace the ETACS-ECU.
Go to Step 4.
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to the OSS-ECU.
(1)Erase the diagnosis code.
(2)Turn the engine switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the OSS-ECU.
Intermittent malfunction is suspected (Refer to GROUP 00 -
How to Use
Troubleshooting/Inspection Service Points -
How to cope with Intermittent Malfunction ).
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting 
).