Mitsubishi Montero (2004+). Manual — part 695
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-37
STEP 1. Use scan tool MB991958 to select "ECU COMM
CHK" on the SWS monitor display.
Check the following ECUs:
• ETACS-ECU
• Column-ECU
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 the special tool. Refer to "How to connect SWS
monitor
.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."
(4) Scan tool MB991958 should show "OK" on the "ECU
COMM CHK" menus for both the "ETACS ECU" and the
"COLUMN ECU" menus.
Q: Is "OK" displayed on both the "ETACS ECU" and
"COLUMN ECU" menus?
"OK" are displayed for all the items : Go to Step 2.
"NG" is displayed on the "COLUMN ECU" menu : Go to
Step 2.
"NG" is displayed on the "ETACS ECU" menu : Refer to
Inspection Procedure A-3 "Communication with
ETACS-ECU is not possible
"NG" are displayed for all the items : Refer to Inspection
Procedure A-3 "Communication with ETACS-ECU is
not possible
STEP 2. Check column switch connector D-203 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is column switch connector D-203 in good condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). The
system should communicate with the column switch
(column-ECU) normally.
AC309091
MB991911
MB991827
MB991824
AB
MB991806
MB991862
DATA LINK
CONNECTOR
(16-PIN)
DATA LINK
CONNECTOR
(13-PIN)
AC204172
CONNECTOR : D-203
AC
HARNESS SIDE
1
2
3
7
8
6
5
10
4
9
D-203
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-38
STEP 3. Check the battery power supply circuit to the
column switch. Test at column switch connector D-203.
(1) Disconnect column switch connector D-203 and measure
the voltage available at the wiring harness side of the
connector.
(2) Measure the voltage between terminal 1 and ground by
backprobing.
• 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 5.
NO : Go to Step 4.
STEP 4. Check the wiring harness between column switch
connector D-203 (terminal 1) and the battery.
NOTE: Also check intermediate connector D-28 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector D-28 is damaged, repair or
replace the damaged component(s) as described in GROUP
00E, Harness Connector Inspection
Q: Is the wiring harness between column switch connector
D-203 (terminal 1) and the battery in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the column switch
(column-ECU) normally.
AC204172
CONNECTOR : D-203
AC
HARNESS SIDE
1
2
3
7
8
6
5
10
4
9
D-203
5 4 3 2 1
10 9 8 7 6
AC203693
CONNECTOR D-203
(HARNESS SIDE)
AC
AC204172
CONNECTOR : D-203
AC
HARNESS SIDE
1
2
3
7
8
6
5
10
4
9
D-203
AC204170
CONNECTOR : D-28
AI
2 3
27
32
28
33
16
15
4 5
19
18
29
17
34
7 8
35
22
21
9 10
30
36
31
37
25
24
23
6
20
1
14
26
11
13
12
38
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-39
STEP 5. Check the ground circuit to the column switch.
Test at column switch connector D-203.
(1) Disconnect column switch connector D-203 and measure
the resistance available at the wiring harness side of the
connector.
(2) Measure the resistance value between terminal 4 and
ground.
• The resistance should equal 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check the wiring harness between column switch
connector D-203 (terminal 4) and the ground.
Q: Is the wiring harness between column switch connector
D-203 (terminal 4) and the ground in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the column switch
(column-ECU) normally.
STEP 7. Check ETACS-ECU connector D-224 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-224 in good condition?
YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. The system should communicate with the
column switch (column-ECU) normally.
AC204172
CONNECTOR : D-203
AC
HARNESS SIDE
1
2
3
7
8
6
5
10
4
9
D-203
ACX00772
5 4 3 2 1
10 9 8 7 6
CONNECTOR D-203
(HARNESS SIDE)
AB
AC204172
CONNECTOR : D-203
AC
HARNESS SIDE
1
2
3
7
8
6
5
10
4
9
D-203
AC204174
CONNECTOR : D-224
AD
D-224(B)
D-224(B)
HARNESS SIDE
21
23
24
22
32
3433
31
26
27
28
3029
38
39
40
36
37
25
35
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-40
STEP 8. Check the wiring harness between column switch
connector D-203 (terminal 3) and ETACS-ECU connector
D-224 (terminal 21).
Q: Is the wiring harness between column switch connector
D-203 (terminal 3) and ETACS-ECU connector D-224
(terminal 21) in good condition?
YES : Go to Step 9.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the column switch
(column-ECU) normally.
STEP 9. Check the wiring harness between column switch
connector D-203 (terminal 2) and ETACS-ECU connector
D-224 (terminal 31).
Q: Is the wiring harness between column switch connector
D-203 (terminal 2) and ETACS-ECU connector D-224
(terminal 31) in good condition?
YES : Go to Step 10.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the column switch
(column-ECU) normally.
AC204172
CONNECTOR : D-203
AC
HARNESS SIDE
1
2
3
7
8
6
5
10
4
9
D-203
AC204174
CONNECTOR : D-224
AD
D-224(B)
D-224(B)
HARNESS SIDE
21
23
24
22
32
3433
31
26
27
28
3029
38
39
40
36
37
25
35
AC204172
CONNECTOR : D-203
AC
HARNESS SIDE
1
2
3
7
8
6
5
10
4
9
D-203
AC204174
CONNECTOR : D-224
AD
D-224(B)
D-224(B)
HARNESS SIDE
21
23
24
22
32
3433
31
26
27
28
3029
38
39
40
36
37
25
35
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