Mitsubishi Montero (2004+). Manual — part 696
SYMPTOM PROCEDURES
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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
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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
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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
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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
. 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
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