Mitsubishi Evolution X. Manual - part 839

WINDSHIELD WIPER AND WASHER

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EXTERIOR

51-39

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Use the scan tool MB991958 to check if an 
ETACS-related diagnostic trouble code is set. 
Connect the scan tool. Refer to "How to connect the scan tool 
(M.U.T.-III) 

P.54B-4

."

Q: Is the diagnostic trouble code set?

YES : Diagnose the ETACS-ECU. Refer to Diagnostic 

trouble code chart 

P.54A-582

."

NO :  Go to Step 2.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

WINDSHIELD WIPER AND WASHER

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EXTERIOR

51-40

STEP 2. Using scan tool MB991958, check data list. 
Check the input signal related to the windshield wiper opera-
tion.

• Ignition switch: ACC

• Operate the windshield wiper switch at each switch posi-

tion.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : Go to Step 3.
NO :  Troubleshoot the ETACS-ECU. Refer to ETACS, 

Diagnosis - Inspection Procedure 12 "ETACS-ECU 
does not receive any signal from the column switch 
signal." 

P.54A-639

.

STEP 3. Check that the windshield wipers work.
Check that the windshield wipers work at high speed and the 
mist mode.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Go to Step 10.

STEP 4. Check windshield wiper motor connector A-06 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is windshield wiper motor connector A-06 in good 

condition?
YES : Go to Step 5.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the windshield wiper operates 

normally when the windshield wiper switch is moved 
to each position.

Item No.

Item name

Windshield 
wiper 
switch 
position

Normal 
condition

Item 235

Front wiper 
ACT

LO

ON

HI

INT

ON and 
OFF

MIST

ON

Item 236

Front wiper 
Lo/Hi

LO

OFF

HI

ON

INT

OFF

MIST

ON

WINDSHIELD WIPER AND WASHER

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51-41

STEP 5. Check the windshield wiper motor.
(1) Disconnect windshield wiper motor connector A-06.
(2) Connect a battery to the windshield wiper motor as shown. 

Then check if the windshield wiper motor operates normally 
at high and low speeds.

Q: Does the windshield wiper motor operate normally?

YES : Go to Step 6.
NO :  Replace the windshield wiper motor. Verify that the 

windshield wiper operates normally when the 
windshield wiper switch is moved to each position.

STEP 6. Measure the voltage at windshield wiper motor 
connector A-06
(1) Disconnect the connector, and measure the voltage at the 

wiring harness side.

(2) Ignition switch: ACC
(3) windshield wiper switch: LO
(4) Measure the voltage between A-06 windshield wiper motor 

connector terminal No. 3 and body ground.

OK: Battery voltage

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/Inspection Service Points - 
How to Cope with Intermittent Malfunction 

P.00-15

).

NO :  Go to Step 7.

STEP 7. Check ETACS-ECU connector C-304 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-304 in good condition?

YES : Go to Step 8.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the windshield wiper operates 

normally when the windshield wiper switch is moved 
to each position.

4 5

3

1 2

4 5

3

1 2

4 5

3

1 2

AC608787AB

Operation check

Low speed

High speed

AC608254CL

Harness side: A-06

WINDSHIELD WIPER AND WASHER

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51-42

STEP 8. Check the wiring harness between windshield 
wiper motor connector A-06 (terminals 1) and ETACS-ECU 
connector C-304 (terminals 6).
Q: Is the wiring harness between windshield wiper motor 

connector A-06 (terminals 1) and ETACS-ECU connector 
C-304 (terminals 6) in good condition?
YES : Go to Step 9.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Verify that 
the windshield wiper operates normally when the 
windshield wiper switch is moved to each position.

STEP 9. Retest the system.
Check that the windshield wipers work normally by moving the 
switch to each position.
Q: Is the check result normal?

YES : Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/Inspection Service Points - 
How to Cope with Intermittent Malfunction 

P.00-15

).

NO :  Replace the ETACS-ECU.

STEP 10. Check the A-06 windshield wiper motor 
connector
Q: Is the check result normal?

YES : Go to Step 11.
NO :  Repair the connector concerned.

STEP 11. Check the windshield wiper motor.
(1) Disconnect windshield wiper motor connector A-06.
(2) Connect a battery to the windshield wiper motor as shown. 

Then check if the windshield wiper motor operates normally 
at high and low speeds.

Q: Does the windshield wiper motor operate normally?

YES : Go to Step 12.
NO :  Replace the windshield wiper motor. Verify that the 

windshield wiper operates normally when the 
windshield wiper switch is moved to each position.

4 5

3

1 2

4 5

3

1 2

4 5

3

1 2

AC608787AB

Operation check

Low speed

High speed