Content .. 1 2 3 4 ..

Mitsubishi 380. Manual - part 3

SPECIAL TOOL

SIMPLIFIED WIRING SYSTEM (SWS)

54B-9

MB991813

A: MB991806
B: MB991812
C: MB991822

SWS monitor kit

A: SWS monitor

cartridge

B: SWS monitor

harness (for
column-ECU)

C: Probe harness

SWS communication line check
(ECU check and service data)

MB991529
Diagnostic trouble
code check harness

Tool not necessary if
the diagnostic tool
(MUT-III) is available

Checking input signal when using
a voltmeter

MB991223

A: MB991219
B: MB991220
C: MB991221
D: MB991222

Harness set

A: test harness
B: LED harness
C: LED harness

adaptor

D: Probe

General service tools

Making voltage and resistance
measurement during
troubleshooting

A: Connector pin contact

pressure inspection

B: Power circuit inspection
C: Power circuit inspection
D: Commercial tester connection

TOOL

TOOL NUMBER
AND NAME

SUPERSESSION

APPLICATION

B991813

MB991529

MB991223

SWS DIAGNOSIS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-10

SWS DIAGNOSIS

GENERAL DESCRIPTION

BEFORE CARRYING OUT TROUBLESHOOTING

M1549014700710

Before carrying out troubleshooting, check the fol-
lowing two items.

• Make sure that the ETACS-ECU, the junction

block (J/B), the front-ECU and the engine com-
partment relay box are connected securely.

• Make sure that fuses and fusible links related to

relevant systems are not blown.

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

DIAGNOSTIC FUNCTION

M1549028900245

ON-BOARD DIAGNOSTICS

If an error occurs in the ECU or the SWS or CAN
communication line which performs the SWS or CAN
communication, the DTC is memorized in
ETACS-ECU. The DTCs have 11 items. The DTCs
are checked to connect diagnostic tool MB991958
(MUT-III sub assembly). The memorised DTCs are
not erased even if the ignition switch is turned to the
LOCK (OFF) position. The DTCs are erased to oper-
ate diagnostic tool MB991958 (MUT-III sub assem-
bly).

NOTE:

: For vehicles that do not have a sunroof,

the diagnosis code is always sent but it does not indi-
cate a problem.

NOTE:

: The diagnosis code for the current prob-

lem is not sent.

NOTE:

: For vehicles that do not have a multi cen-

ter display (middle grade type), the diagnosis code is
always sent but it does not indicate a problem.

HOW TO CONNECT THE DIAGNOSTIC TOOL
(MUT-III)

Required Special Tools:

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

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

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

DTC CODE

TROUBLE CONTENT

001 or U1700

Malfunction of SWS communication line or ETACS-ECU

002 or U1701

Malfunction of column switch

003 or U1702

Malfunction of front-ECU

004

or U1073

Malfunction of sunroof-ECU

010

or U1073

Bus Off

011 or U1100

Engine ECU time-out

012 or U1101

A/T ECU time-out

013 or U1110

A/C-ECU time-out

014 or U1108

Combination meter time-out

015

or U1111

Multi center display unit time-out

021 or U1128

Failure information on combination meter

SWS DIAGNOSIS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-11

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. Ensure that the ignition switch is at the "LOCK" (OFF)

position.

2. Start up the personal computer.

3. Connect special tool MB991827 to special tool MB991824

and the personal computer.

4. Connect special tool MB991910 to special tool MB991824.

5. Connect special tool MB991910 to the data link connector.

6. Turn the power switch of special tool MB991824 to the "ON"

position.

NOTE: When special tool MB991824 is energized, special
tool MB991824 indicator lamp will be illuminated in a green
color.

7. Start the MUT-III system on the personal computer.

NOTE: Disconnecting diagnostic tool MB991958 is the reverse
of the connecting sequence, making sure that the ignition
switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES

Required Special Tools:

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

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

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

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.

NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if diagnostic tool MB991958 does
not display.
1. Connect diagnostic tool MB991958 to the data link

connector.

2. Turn the ignition switch to the "ON" position.

3. Select "Interactive Diagnosis" from the start-up screen.

4. Select "System select."

5. Choose "ETACS" .

6. Select "Diagnostic Trouble Code."

7. If a DTC is set, it is shown.

8. Choose "Erase DTCs" to erase the DTC.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SWS DIAGNOSIS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-12

HOW TO DIAGNOSE THE CAN BUS LINES

Required Special Tools:

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

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

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

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 to the data link

connector.

2. Turn the ignition switch to the "ON" position.

3. Select "CAN bus diagnosis" from the start-up screen.

4. When the vehicle information is displayed, confirm that it

matches the vehicle being diagnosed.

• If they match, go to step 8.

• If not, go to step 5.

5. Select the "view vehicle information" button.

6. Enter the vehicle information and select the "OK" button.

7. When the vehicle information is displayed, confirm again

that it matches the vehicle being diagnosed.

• If they match, go to step 8.

• If not, go to step 5.

8. Select the "OK" button.

9. When the optional equipment screen is displayed, choose

the one which the vehicle is fitted with, and then select the
"OK" button.

SWS DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1549000500906

1. Gather information about the problem from the

customer.

2. Verify that the condition described by the

customer exists.

NOTE: If an error occurs in the SWS communica-
tion line, the ECU isolated from the communica-
tion line performs a fail-safe or backup operation,
so the problem may not match the one shown in
the Trouble Symptom Chart. However, the cause
of the failure can be tracked down by performing
the following troubleshooting with the SWS moni-
tor.

3. Version number and destination check

Check whether the SWS version number and
destination meet the vehicle specifications. If they
are different, replace the ETACS-ECU with a
correct one.

4. Use diagnostic tool MB991958 (MUT-III Sub

Assembly) to select "ECU COMM Check" on the
SWS monitor display.

Check whether the communication status of the
input- or output-signal-side ECU associated with
the defective function is normal.

• If "OK" is displayed for all related ECUs, they

communicate with each other normally and the
input or output signal circuit system may be
defective. Therefore, check SWS monitor service
data.

• If "NG" is displayed for any of the related ECUs,

something may be wrong with the ECU for which
"NG" appears, its power supply or grounding sys-
tem, or a wiring harness or connector between
the SWS monitor and the ECU. Check the wiring
harness and connectors associated with the ECU
and examine the ECU itself.

5. Service data on the SWS monitor

Select the defective function from the
function-specific diagnostic menu, and check the
service data that appears for each function item.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

Content .. 1 2 3 4 ..