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Mitsubishi 380. Manual - part 18

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-69

STEP 1. Use diagnostic tool MB991958 to select "ECU
COMM Check" on the SWS monitor display.
Check the following ECUs:

• ETACS-ECU

• Column-ECU

CAUTION

To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting diagnostic tool
MB991958. Connect special tool MB991910 before con-
necting special tool MB991812. Be sure to connect special
tool MB991806 after turning on special tool MB991824.
(1) Connect the special tool. Refer to "How to connect SWS

monitor

P.54B-13

(2) Turn the ignition switch to the "ON" position.
(3) Operate diagnostic tool MB991958 according to the

procedure below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

(4) DIAGNOSTIC TOOL MB991958 should show "OK" on the

"ECU COMM Check" menus for both the "ETACS ECU"
and the "COLUMN ECU" menus.

Q: Is "OK" displayed for both the "ETACS ECU" and

"COLUMN ECU" menus?
"OK" is displayed for all the items : Go to Step 2.
"NG" is displayed for the "COLUMN ECU" menu : Go to

Step 6.

"NG" is displayed for the "ETACS ECU" menu : Refer to

Inspection Procedure A-3 "Communication with the
ETACS-ECU is not possible

P.54B-74

"NG" is displayed for all the items : Refer to Inspection

Procedure A-3 "Communication with the ETACS-ECU
is not possible

P.54B-74

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-70

STEP 2. Check column switch connector C-309 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is column switch connector C-309 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.

STEP 3. Check the power supply circuit to the column
switch. Measure the voltage at column switch connector
C-309.
(1) Disconnect column switch connector C-309 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 measure 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 C-309 (terminal 1) and the battery.

54DB051A

HARNESS SIDE

CONNECTOR: C-309

54DB051A

HARNESS SIDE

CONNECTOR: C-309

AC209365FF

CONNECTOR C-309
(HARNESS SIDE)

54DB051A

HARNESS SIDE

CONNECTOR: C-309

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-71

NOTE: Also check intermediate connector C-29 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-29 is damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

Q: Is the wiring harness between column switch connector

C-309 (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.

STEP 5. Check the ground circuit to the column switch.
Measure the resistance at column switch connector C-309.
(1) Disconnect column switch connector C-309 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 be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 7.
NO : Go to Step 6.

54DB052A

C-29

CONNECTOR: C-29

54DB051A

HARNESS SIDE

CONNECTOR: C-309

AC209364GX

CONNECTOR C-309
(HARNESS SIDE)

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-72

STEP 6. Check the wiring harness between column switch
connector C-309 (terminal 4) and ground.
Q: Is the wiring harness between column switch connector

C-309 (terminal 4) and ground in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the

STEP 7. Check ETACS-ECU connector C-218 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-218 in good condition?

YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. The system should communicate with the

column switch (column-ECU) normally.

STEP 8. Check the wiring harness between column switch
connector C-309 (terminal 3) and ETACS-ECU connector
C-218 (terminal 53).
Q: Is the wiring harness between column switch connector

C-309 (terminal 3) and ETACS-ECU connector C-218
(terminal 53) in good condition?
YES : Go to Step 9.
NO : The wiring harness may be damaged or the

54DB051A

HARNESS SIDE

CONNECTOR: C-309

54DB006A

CONNECTORS: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

48 47

50
59

51
60

53
62

54
63

67 66

54DB006A

CONNECTORS: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

48 47

50
59

51
60

53
62

54
63

67 66

54DB051A

HARNESS SIDE

CONNECTOR: C-309

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