Mitsubishi Galant 9G. Manual - part 22

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-84

STEP 7. Check the wiring harness between column switch
connector C-309 (terminal 2) and ETACS-ECU connector
C-218 (terminal 68).
Q: Is the wiring harness between column switch connector

C-309 (terminal 2) and ETACS-ECU connector C-218
(terminal 68) in good condition?
YES : Go to Step 8.
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 ETACS-ECU normally.

STEP 8. Check the wiring harness between column switch
connector C-309 (terminal 3) and ETACS-ECU connector
C-218 (terminal 59).

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

AC305235

HARNESS SIDE

CONNECTOR: C-309

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

AC305235

HARNESS SIDE

CONNECTOR: C-309

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-85

NOTE: Also check joint connector C-03 for loose, corroded, or
damaged terminals, or terminals pushed back in the connector.
If joint connector C-03 is damaged, repair or replace the dam-
aged component(s) as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

Q: Is the wiring harness between column switch connector

C-309 (terminal 3) and ETACS-ECU connector C-218
(terminal 59) in good condition?
YES : Replace the ETACS-ECU. The system should

communicate with the ETACS-ECU normally.

NO : The wiring harness may be damaged or the

AC305231BP

CONNECTOR: C-03

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-86

INSPECTION PROCEDURE A-4: Communication with the Front-ECU is not Possible.

NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54B-15

RELAY
BOX

BATTERY

IGNITION
SWITCH (IG2)

POWER
SOURCE

ETACS-ECU

FRONT-
ECU

Front-ECU Power Supply and SWS Communication Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-87

CIRCUIT OPERATION

• The power supply to the front-ECU is provided by

the battery and the ignition switch (IG2).

• If the power supply system from the battery is

defective, the system operates by the power sup-
ply from the ignition switch (IG2).

TECHNICAL DESCRIPTION (COMMENT)

It is suspected that the power supply circuit to the
front-ECU is defective, or the wiring harness
between the SWS monitor kit and the front-ECU or
their connector(s) is damaged. If the battery power
supply circuit to the ECU (terminal 5 of the
front-ECU) is damaged, also check the power supply
circuit from the ignition switch (IG2) (terminal 22 of
the front-ECU), and repair if necessary.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have

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

• The front-ECU may be defective

• The ETACS-ECU may be defective

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

• MB991910: MUT-III Main Harness A

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

AC305977AG

CONNECTORS: A-11X, A-12X

A-12X

A-11X

AC305231

C-29

C-03

CONNECTORS: C-03, C-29

AC305413AL

CONNECTOR: C-218

C-218 (GR)

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