Inspection Procedure 6: The intermittent wiper interval is not changed according to the vehicle speed.


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

OPERATION


The ETACS-ECU calculates the intermittent wiper interval according to the vehicle speed signal which is sent by the Engine-ECU.

COMMENTS ON TROUBLE SYMPTOM


If the intermittent wiper interval does not depend on the vehicle speed, the input circuit of the vehicle speed signal (combination meter) and the ETACS-ECU may be defective. Alternatively, the vehicle speed-dependent wiper may be set to "disabled" by using the customisation function.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Check the operation of windshield intermittent wiper volume control.
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 5 "The windshield intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper volume control" .

STEP 2. Check the ETACS customisation function.
Use the ETACS customisation function to confirm that "FRONT WIPER OPERATION" is set to "VEHICLE SPEED DEPENDENT".

Q. Is the check result normal?
Go to Step 3.
Use the ETACS customisation function to set "FRONT WIPER OPERATION" to "VEHICLE SPEED DEPENDENT" (Refer to ).

STEP 3. M.U.T.-III data list
Check the combination meter- related input signals.

  • Drive the vehicle and change the vehicle speed.
Item No.
 Item name
 Normal condition
Item 80
 Speed meter
 Speedometer displayed value and M.U.T.-III displayed value agree with each other.

Q. Is the check result normal?
Go to Step 4.
Normal value is not displayed for item No. 80. : Perform the troubleshooting to the speedometer (Refer to GROUP 54A - Combination Meter, Inspection Procedure 5 "Speedometer does not work." Refer to ).

STEP 4. Retest the system.
Check that the intermittent wiper interval depends on the vehicle speed.

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.