Mitsubishi Montero Sport (2004+). Manual — part 476

KEYLESS ENTRY SYSTEM

TSB Revision

BODY

42-159

DIAGNOSIS

STEP 1. Verify the keyless entry system.
Q: Does the keyless entry system work normally?

YES : Go to Step 2.
NO : Refer to Inspection Procedure 1 "All of the doors can

not be locked or unlocked using the transmitter

P.42-155

."

STEP 2. Check the configuration function.
Q: Has the answerback function been enabled by means of

the adjustment function?
YES : Go to Step 3.
NO : Enable the answerback function by means of the

adjustment function. Verify that the answerback
functions work normally. Rrfer to ETACS-ECU
function adjustment procedure

P.42-166

.

STEP 3. Check keyless entry receiver-ECU connector E-25
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is keyless entry receiver-ECU connector E-25

damaged?
YES : Repair or replace the damaged components. Refer to

GROUP 00E

P.00E-2

, Harness Connector

Inspection.

NO : Go to Step 4.

STEP 4. Measure the resistance at keyless entry
receiver-ECU.
(1) Remove the keyless entry receiver-ECU. (Refer to

P.42-167

.)

(2) Follow the table to check the keyless entry receiver-ECU

continuity.

Q: Is the measured resistance less than 2 ohms?

YES : Replace keyless entry receiver-ECU, then go to Step

7.

NO : Go to Step 5.

AC202085

1

2

3

5 4

6

CONNECTOR: E-25

AB

E-25

COMPONENT
SIDE

TESTER CONNECTION

SPECIFIED CONDITION

2

− 4

Less than 2 ohms

AC004953

6

5

4

3

2

1

KEYLESS ENTRY SYSTEM

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BODY

42-160

STEP 5. Check ETACS-ECU connector D-27 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-27 damaged?

YES : Repair or replace the damaged components. Refer to

GROUP 00E

P.00E-2

, Harness Connector

Inspection.

NO : Go to Step 6.

STEP 6. Check the harness wire between keyless entry
receiver-ECU connector E-25 (terminal No. 6) and
ETACS-ECU connector D-27 (terminal No.46).

NOTE: After inspecting intermediate connector E-42 inspect
the wire. If intermediate connector E-42 is damaged, repair or
replace it. Refer to GROUP 00E

P.00E-2

, Harness Connector

Inspection. Then go to Step 7.
Q: Are there any damaged harness wires between keyless

entry receiver-ECU connector E-25 (terminal No. 6) and
ETACS-ECU connector D-27 (terminal No. 46)?
YES : Repair or replace the harness wire, then go to Step 7.
NO : Replace the ETACS-ECU. Then go to Step 7.

AC201834

42

43

50

51

45

46

53

54

52

44

48

5655

47

49

41

AC

JUNCTION BLOCK SIDE (REAR)

CONNECTOR: D-27

COMPONENT SIDE

D-27(B)

AC201834

42

43

50

51

45

46

53

54

52

44

48

5655

47

49

41

AC

JUNCTION BLOCK SIDE (REAR)

CONNECTOR: D-27

COMPONENT SIDE

D-27(B)

AC202085

1

2

3

5 4

6

CONNECTOR: E-25

AB

E-25

COMPONENT
SIDE

AC202086

8

19

7

6

5

16

15

17 18

4

3

2

10 11 12 13

1
9

14

E-42

AB

CONNECTOR: E-42

KEYLESS ENTRY SYSTEM

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BODY

42-161

STEP 7. Retest the system.
Q: Does the answerback operate normally?

YES : The procedure is complete. (This malfunction is

intermittent. Refer to GROUP 00

P.00-7

, How to Use

Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction.

NO : Return to Step 1.

MEASUREMENT AT THE RECEIVER TERMINALS

M1428003600030

6

5

4

3

2

1

AC004487

TERMINAL

SIGNAL

REQUIREMENT

TERMINAL VOLTAGE

1

Receiver power supply

Always

Battery positive voltage

2

Ignition switch (ACC) signal Ignition switch: "ACC" or "ON"

Battery positive voltage

Ignition switch: "OFF"

0V

4

Ground

Always

0V

5

Data link switching input

Connect scan tool MB991958
(MUT-III sub assembly).

0V

Disconnect scan tool MB991958
(MUT-III sub assembly).

Battery positive voltage

6

Multiplex communication

Always

0

− 5V (pulse signal)

KEYLESS ENTRY SYSTEM

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BODY

42-162

SPECIAL TOOLS

M1428000600398

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991529 Diagnostic
trouble code check harness

Tool not necessary if
scan tool (MUT-III) is
available

• For registration of secret

code

• For setting of

answerback function

MB991958

A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826

MUT-III sub assembly

A: Vehicle communication

interface (V.C.I.)

B: MUT-III USB cable
C: MUT-III main harness A

(Vehicles with CAN
communication system)

D: MUT-III main harness B

(Vehicles without CAN
communication system)

E: MUT-III main harness C

(for Daimler Chrysler
models only)

F: MUT-III measurement

adapter

G: MUT-III trigger harness

MB991824-KIT
NOTE: G: MB991826
MUT-III trigger
harness is not
necessary when
pushing V.C.I. ENTER
key.

SWS communication line
check (ECU check and
service data)

CAUTION

MUT-III main harness B
(MB991911) should be
used. MUT-III main
harness A and C should
not be used for this
vehicle.

MB991529

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE