Mitsubishi Evolution X. Manual - part 491

DOOR

TSB Revision

BODY

42A-67

CODE NO. L0746 P/W (DR) Parameter read fail

 

CODE NO. L0750 P/W (DR) Position read fail

CAUTION

Before replacing the ECU, ensure that the input 
and output signal circuits are normal.

.

COMMENTS ON TROUBLE SYMPTOM

• If the power window main switch information sig-

nals cannot be read, power window main switch 
sets the diagnostic trouble code No. L0746.

• If the driver's door window glass position cannot 

be read, power window main switch sets the 
diagnostic trouble code No. L0750.

.

PROBABLE CAUSES

• Malfunction of the power window main switch

DIAGNOSTIC PROCEDURE

Diagnostic trouble code recheck
Recheck if the diagnostic trouble code is set.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the LOCK (OFF) position to the 

ON position.

(3) Check if the diagnostic trouble code is set.
Q: Is the diagnostic trouble code set?

YES : Replace the power window main switch.
NO :  The procedure is complete.  Verify that the power 

window works normally.

DOOR

TSB Revision

BODY

42A-68

SYMPTOM PROCEDURES <POWER WINDOW>

INSPECTION PROCEDURE 1: Power Windows do not work at All.

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the ground circuit and the com-
munication circuit are normal.

AC609757

ETACS-ECU

POWER
WINDOW
RELAY

FUSIBLE 
LINK

34

FUSIBLE 
LINK

36

ENGINE 
COMPARTMENT

RELAY BOX

BLA

CK

BLA

CK

BLA

CK

BLA

CK

BLA

CK

BLA

CK

WHITE

WHITE

WHITE

WHITE

WHITE

ORANGE

ORANGE

POWER WINDOW MAIN SWITCH, FRONT POWER WINDOW 
SUB SWITCH, REAR POWER WINDOW SUB SWITCH

CPU

POWER 
WINDOW 
MAIN SWITCH

AC

Power Window Power Supply Circuit

DOOR

TSB Revision

BODY

42A-69

.

CIRCUIT OPERATION

The ETACS-ECU turns on the power window relay to 
activate the power windows when the ignition switch 
(IG1) is turned to the "ON" position.

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The power window main switch may be defective

• The ETACS-ECU may be defective

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB992006: Extra fine probe

• MB991223: Harness set

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

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Check the power supply system.
With the ignition switch in the LOCK (OFF) position, check if 
the following function operates normally:

• Hazard warning light

Q: Is the check result normal?

YES : Go to Step 2.
NO :  Refer to GROUP 54A 

− malfunction of ETACS-ECU 

power supply circuit 

P.54A-636

.

AC708950AS

Connector: C-128

 

AC708972AR

Connectors: C-307, C-309, C-315

ETACS-ECU

C-309 (B)

C-307 (B)

C-315

AC608167AM

Connector: E-15

DOOR

TSB Revision

BODY

42A-70

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect 

scan tool (M.U.T.-III) 

P.42B-10

."

(2) Turn the ignition switch to the "ON" position.
(3) Check whether the ETACS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU. Refer to GROUP 54B, 

Diagnostic trouble code chart 

P.54B-5

.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, check data list.
Check the signals related to the power window operation.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to  "How to connect 

the Scan Tool (M.U.T.-III) 

P.42B-10

."

(2) Turn the ignition switch to the "ON" position.
(3) Check the data list of the ETACS.

• Turn the ignition switch to the LOCK (OFF) position.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Refer to GROUP 54A, Inspection Procedure 2: 

ETACS-ECU does not receive any signal from the 
ignition switch (IG1) 

P.54A-642

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

Item No.

Item name

Normal 
condition

254

IG voltage

Battery 
voltage 

AC608435

Data link connector

MB991827

MB991824

MB991910

AB