Inspection Procedure 5: The Intermittent Wiper Interval is not Changed According to The Vehicle Speed.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM


The ETACS-ECU calculates the intermittent wiper interval according to the vehicle speed signal which is sent by the engine-ECU.
If the intermittent wiper interval does not depend on the vehicle speed, the input circuit of the vehicle speed signal or the ETACS-ECU may be defective. Alternatively, there are cases where the intermittent wiper interval does not depend on the vehicle speed because of the setting by the adjustment function.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Retest the system.
Check that the windshield intermittent wiper interval can be adjusted by operating the windshield intermittent wiper volume control.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 4 " The intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper volume control ."

STEP 2. Check of the adjustment details for the vehicle speed-sensing wiper function
Check that the vehicle speed-dependent wiper function is set to "Operation" using the customisation function of M.U.T-III.

Q. Is the check result normal?
Go to Step 3.
Using the customisation function of M.U.T-III, set the speed-dependent wiper function to "Operation."

STEP 3. 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 4.
Repair the CAN bus line (Refer to GROUP 54C, Troubleshooting ).

STEP 4. Check the diagnosis code of the engine-ECU.
Check if the diagnosis code is set in either of the engine-ECU.

Q. Is the diagnosis code set?
Diagnose the engine-ECU (Refer to GROUP 13A, Troubleshooting ).
Go to Step 5.

STEP 5. M.U.T.-III diagnosis code.
When the ignition switch is turned to the "LOCK" (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?
Refer to GROUP 54A, Diagnosis Code Chart .
Go to Step 6.

STEP 6. Retest the system.
Check that the intermittent wiper interval depends on the vehicle speed.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.