Mitsubishi Montero Sport (2004+). Manual - part 448

 

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Mitsubishi Montero Sport (2004+). Manual - part 448

 

 

DOOR

TSB Revision

BODY

42-47

.

CIRCUIT OPERATION
When the driver's inside door knob is operated to the 
lock side, the ETACS-ECU will output the door lock 
signal for 0.5 second. If the driver's door side door 
lock key cylinder is operated to the unlock side, the 
ETACS-ECU will output the unlock signal for 0.5 sec-
ond.

.

TECHNICAL DESCRIPTION (COMMENT)
The front door lock actuator (LH), the door lock key 
cylinder (LH), the ETACS-ECU, harness or connec-
tor may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the front door lock actuator (LH)

• Malfunction of the door lock key cylinder switch 

(LH)

• Malfunction of the ETACS-ECU

• Damaged wiring harness or connector

AC309309AK

CONNECTOR: C-39

C-39

AC004311AE

CONNECTORS: D10, D-26, D-27 

D-26

D-10

D-27

JUNCTION BLOCK

(REAR)

AC004320

F-06

F-12

CONNECTORS: F-06, F-12

AC

FRONT

DOOR

(LH)

DOOR

TSB Revision

BODY

42-48

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991529: Diagnostic Trouble Code Check Harness

• MB991958: Scan Tool (MUT-III Sub Assembly)

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

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

STEP 1. Choose method of ETACS-ECU input signal check
Q: Is the ETACS-ECU input signal check performed by 

scan tool MB991958 or a voltmeter?
By Scan tool MB991958 : 
Go to Step 2.
By a Voltmeter <The door lock actuator switch (front: 
LH) check> : 
Go to Step 3.
By a Voltmeter <The door lock key cylinder switch (LH) 
check> : 
Go to Step 4.

STEP 2. Check the input signal (by using the pulse check) 
(by using MB991958).
Check the ETACS-ECU input signal [door lock actuator (front: 
LH) or door lock key cylinder switch (LH)] by using scan tool 
MB991958.

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 to the data link connector.
(2) Operate scan tool MB991958 as follows:

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."

(3) Move the driver's inside door lock knob from "LOCK" to 

"UNLOCK" or vice versa.

(4) Use the driver’s door lock key cylinder to lock and unlock 

the doors.

(5) Check that scan tool MB991958 sounds
Q: Does the tone alarm of scan tool MB991958 sound when 

the input signal enters?
YES : 
Replace the ETACS-ECU and then go to Step 15.
NO <The door lock actuator (front: LH) input signal> : 

Go to Step 5.

NO <The door lock key cylinder switch (LH) input 
signal> : 
Go to Step 10.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

DOOR

TSB Revision

BODY

42-49

STEP 3. Check the ETACS-ECU input signal from the door 
lock actuator switch (front: LH) (by using a voltmeter).
(1) Use special tool MB991529 to connect a voltmeter between 

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the 
data link connector.

(2) Check that the voltmeter indicator deflects once when the 

door lock actuator switch (front: LH) is operated 
(lock/unlock).

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU and then go to Step 15.
NO :  Go to Step 5.

STEP 4. Check the input signal from the door lock key 
cylinder switch (LH) (by using a voltmeter).
(1) Use special tool MB991529 to connect a voltmeter between 

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the 
data link connector.

(2) Check that the voltmeter indicator deflects once when the 

door lock key cylinder switch (LH) is operated (lock/unlock).

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU and then go to Step 15.
NO :  Go to Step 10.

STEP 5. Check door lock actuator (front: LH) connector 
F-12 for loose, corroded or damaged terminals, or 
terminals pushed back in the connector.
Q: Are the connectors in good condition?

YES : Go to step 6.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E 

P.00E-2

, Harness Connector inspection. 

Then go to Step 15.

7

6

5

4

3

2

1

14

13

12

11

10

9

8

16

15

AC004323

MB991529

GROUND TERMINAL

ETACS TERMINAL

AB

7

6

5

4

3

2

1

14

13

12

11

10

9

8

16

15

AC004323

MB991529

GROUND TERMINAL

ETACS TERMINAL

AB

AC309370

CONNECTOR: F-12

F-12

FRONT DOOR <LH>

AC

1

3 2

4

6 5

COMPONENT SIDE

DOOR

TSB Revision

BODY

42-50

STEP 6. Check the front door lock actuator switch (front: 
LH).
(1) Remove the door latch assembly (Refer to 

P.42-140

).

(2) Follow the table to check the resistance when the door lock 

actuator switch (front: LH) is operated (lock/unlock).

Q: Is the front door lock actuator switch (front: LH) 

damaged?
YES : 
Replace front door lock actuator assembly (front: LH), 

go to Step 15.

NO :  Go to Step 7.

STEP 7. Check ETACS-ECU connector D-10 <Vehicles 
without keyless entry system> or D-27 <Vehicles with 
keyless entry system> for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Are the connectors in good condition?

YES : Go to step 8.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E 

P.00E-2

, Harness Connector inspection. 

Then go to Step 15.

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

At the LOCK 
position

− 2

Less than 2 ohms

At the UNLOCK 
position

− 2

Open circuit 

5

6

1

2

3

4

AC004327AB

VIEW A

A

LOCK

UNLOCK

AC202002

6 5 4

1

2

7

3
8

41

43

51

42

50

44

52

46 45

53

49

47

30

48

56

55

D-27 (B)

D-10

JUNCTION 
BLOCK (REAR)

CONNECTORS: D-10, D-27

AB

D-27 COMPONENT  SIDE

D-10 COMPONENT SIDE

21

22

23

24

25

26

27

28

 

 

 

 

 

 

 

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