Mitsubishi Montero (2004+). Manual - part 696

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-41

STEP 10. Replace the ECU.

(1) Replace the column switch.
(2) The system should communicate with the column switch 

(column-ECU) normally.

Q: Can the system communicate with the column switch 

(column-ECU)?
YES : No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. The system should 

communicate with the column switch (column-ECU) 
normally.

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-42

INSPECTION PROCEDURE A-3: Communication with the ETACS-ECU is not possible.

ETACS-ECU Power Supply and SWS Communication Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-43

.

CIRCUIT OPERATION

• The power supply to the ETACS-ECU is provided 

by the battery and the ignition switch (IG1).

• If the power supply system from the battery is 

defective, the system operates by the power sup-
ply from the ignition switch (IG1).

.

TECHNICAL DESCRIPTION (COMMENT)
It is suspected that the power supply circuit to the 
ETACS-ECU is defective, or the wiring harness 
between the SWS monitor kit and the ETACS-ECU 
or their connector(s) is damaged. If the battery power 
supply circuit to the ECU (terminal 6 of the 

ETACS-ECU) is damaged, also check the power 
supply circuit from the ignition switch (IG1) (terminal 
16 of the ETACS-ECU), and repair if necessary. If the 
ground circuit to the ECU (terminal 20 of the 
ETACS-ECU) is damaged, also check the ground cir-
cuit to the sensor (terminal 23 of the ETACS-ECU), 
and repair if necessary.

.

TROUBLESHOOTING HINTS

• The ETACS-ECU may be defective

• The wiring harness or connectors may have 

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

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• 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

AC204170

CONNECTOR : D-28

BB

AC204172

CONNECTOR : D-203

AG

AC204173

CONNECTORS : D-209, 221               

AL

D-209

D-221

AC204174

CONNECTORS : D-222, D-224

D-224(B)

AH

D-222

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-44

STEP 1. Check ETACS-ECU connector D-222 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector D-222 in good condition?

YES : Go to Step 2.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. The system should communicate with the 

ETACS-ECU normally.

STEP 2. Check the battery power supply circuit to the 
ETACS-ECU. Test at ETACS-ECU connector D-222.

(1) Disconnect ETACS-ECU connector D-222 and measure the 

voltage available at the junction block side of the connector.

(2) Measure the voltage between terminal 6 and ground.

• The voltage should be approximately 12 volts (battery 

positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 4.
NO :  Go to Step 3.

STEP 3. Check the wiring harness between ETACS-ECU 
connector D-222 (terminal 6) and the battery.

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

ACX01610

19

20

1817 1615 141312 1110 9 8 7

6 5 4 3 2 1

AB

CONNECTOR D-222
(JUNCTION BLOCK SIDE)

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222