Mitsubishi Montero Sport (2004+). Manual - part 442

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SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Only the ETACS-ECU Input Signal Cannot be Checked Using the Scan 
Tool (MUT-III Sub Assembly).

.

CIRCUIT OPERATION
The ETACS-ECU signal is sent to the data link con-
nector. A trouble can be diagnosed by connecting the 
scan tool to the data link connector.

.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be a malfunction of the data link 
check circuit or of the scan tool.

.

TROUBLESHOOTING HINTS

• Malfunction of the ETACS-ECU

• Malfunction of the scan tool

• Damaged harness wires or connectors

AC309340

Data Link Connector Circuit

AC309309AG

C-69 (B)

CONNECTOR: C-69

AC004311

D-27 (B)

D-10

JUNCTION BLOCK(REAR)

CONNECTORS: D-10, D-27

AY

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DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check the harness wire between data link 
connector C-69 (terminal No.9) and ETACS-ECU connector 
D-10 (terminal No.25) or D-27(terminal No.48).
(1) Remove the instrument panel side cover <LH> (Refer to 

P.52A-37

.).

(2) Check the harness wire between data link connector C-69 

and ETACS-ECU connector D-10 or D-27.

Q: Is the harness wire between data link connector C-69 

(terminal No.9) and ETACS-ECU connector D-10 
(terminal No.25) or D-27 (terminal No.48) is damaged?
YES : Repair or replace the harness wire. then go to Step 2. 

(Refer to GROUP 00E 

P.00E-2

, Harness Connector 

Inspection.) 

NO :  Replace the ETACS-ECU. Then go to Step 2.

STEP 2. Retest the system
Q: Does the scan tool (MUT-III sub assembly) communicate 

normally?
YES : The procedure is complete.
NO :  Return to Step 1.

AC309309AH

CONNECTOR: C-69

C-69 (B)

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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INSPECTION PROCEDURE 2: None of the Door Lock Function Operate.

ECU Power Supply Circuit

AC003431

CONNECTOR: A-54X

A-54X

AC

AC004314

D-01

D-02 (GR)

CONNECTORS: D-01, D-02

JUNCTION BLOCK

(FRONT)

AG

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.

CIRCUIT OPERATION
The ETACS-ECU power is supplied from fusible link 
number 8.

.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be a malfunction of the ETACS-ECU 
power supply circuit system or of the ground circuit 
system.

.

TROUBLESHOOTING HINTS

• Malfunction of the ETACS-ECU 

• Damaged wiring harness or connector 

AC004311

CONNECTORS: D-11, D-13

D-11

D-13

JUNCTION BLOCK (REAR)

AC