Mitsubishi 380. Manual - part 9

DIAGNOSTIC TROUBLE CODE PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-33

STEP 1. Using diagnostic tool MB991958, diagnose the
CAN bus line.

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.
(1) Connect diagnostic tool MB991958. Refer to "How to

connect SWS monitor

P.54B-13

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-5

STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Go to Step 3.
NO : There is an intermittent malfunction such as poor

engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction

P.00-14

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

DIAGNOSTIC TROUBLE CODE PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-34

STEP 3. Use diagnostic tool MB991958 to select "ECU
COMM Check" on the SWS monitor display.
Check the following ECUs:

• Front-ECU

• ETACS-ECU

CAUTION

Connect special tool MB991910 before connecting special
tool MB991812. Be sure to connect special tool MB991806
after turning on special tool MB991824.
(1) Connect the SWS monitor. Refer to "How to connect SWS

monitor

P.54B-13

(2) Turn the ignition switch to the "LOCK" (OFF) 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 "FRONT ECU" menus.

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

"FRONT ECU" menus?
"OK" are displayed for all the items : It is determined that

there is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction

P.00-14

"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 the "FRONT ECU" menu : Refer to

Inspection Procedure A-4 "Communication with the
front-ECU is not possible

P.54B-80

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

DIAGNOSTIC TROUBLE CODE PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-35

DTC 004: Trouble in Sunroof-ECU

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

P.54B-13

CAUTION

DTC 004 may also set on vehicles without sun-
roof, but there is no fault.

CAUTION

If DTC 004 is set in the ETACS-ECU, always diag-
nose the CAN main bus line.

TROUBLE JUDGMENT

The ETACS-ECU communicates with the front-ECU
through the SWS communication line. If there is any
trouble in that communication, DTC 004 will be set.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

• The sunroof-ECU, the ETACS-ECU, connec-

tor(s), or wiring harness between the two may be
defective.

Past trouble

• If DTC 004 is set as past trouble, carry out diag-

nosis with particular emphasis on wiring and con-
nector(s) between the sunroof-ECU and the
ETACS-ECU or power supply to the sun-
roof-ECU. For diagnosis procedures, refer to
"How to cope with past trouble" (Refer to GROUP
00, How to treat past trouble

P.00-16

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have

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

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: DIAGNOSTIC TOOL (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable