Inspection procedure G-6: 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 and the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the vehicle speed signal (engine-A/T-ECU <A/T> or engine-ECU <M/T>)
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

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 G-5 "The intermittent wiper interval can not be adjusted by operating the windshield intermittent wiper volume control ."

Step 2. Pulse check
Check the input signals below which are related to the vehicle speed-dependent intermittent wiper.
System switch
 Check condition
Vehicle speed signal
 When the vehicle speed has reached 10 km/h or more.
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Is the check result normal?
Go to Step 3.
Refer to Inspection Procedure P-22 "The vehicle speed signal is not received ."

Step 3. Customize function by using the SWS monitor.
Use the SWS monitor customize function to confirm that "SPEED SEN WIP" is set to "W.FUNCTION".
caution The SWS monitor must be used in order to confirm and change that setting. Use the SWS monitor to confirm and/or change the customized function.

Q. Is the check result normal?
Go to Step 4.
Use the SWS monitor customize function to set the "SPEED SEN WIP" to "W.FUNCTION" (Refer to GROUP 54E - Customize adjustment ).

Step 4. Retest the system.
(1)Replace the ETACS-ECU.
(2)Check that the vehicle speed-dependent intermittent wiper system should work normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the combination meter.