Mitsubishi 380. Manual — part 936

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-278

STEP 6. Recheck for diagnostic trouble code.
Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.

Q: Is the check result satisfactory?

YES : The procedure is complete.
NO : Go to Step 1.

DTC 021 (U1128): Failures Information on Combination Meter

CAUTION

If DTC 021 (U1128) is set in the multi-centre dis-
play, always diagnose the CAN bus lines.

.

CIRCUIT OPERATION

Refer to

P.54A-255

.

.

DTC SET CONDITION

The multi-centre display unit communicates with the
combination meter via CAN bus lines. If failure infor-
mation is sent to the combination meter, DTC 021
(U1128) will be set.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

• The combination meter or the multi-centre display

unit may be defective.

Past trouble

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness between the com-
bination meter and the multi-centre display unit .
For diagnosis procedures, refer to "How to cope
with past trouble" (Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points

P.00-14

).

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The wiring harness or connectors may have

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

• Malfunction of combination meter

• Malfunction of multi-centre display unit

DIAGNOSIS

Required Special Tools:

• MB991958: Diagnostic Tool (MUT-III Sub Assembly)

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

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness A (Vehicles with CAN

communication system)

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-279

STEP 1. Using diagnostic tool MB991958, diagnose the
CAN bus line.
Use diagnostic tool MB991958 to diagnose the CAN bus lines.
(1) Connect diagnostic tool MB991958 to the data link

connector.

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

Q: Is the check result satisfactory?

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

Diagnosis-Can Bus Diagnostic Chart

P.54C-15

). On

completion, go to Step 6.

STEP 2. Using diagnostic tool MB991958, read
combination meter diagnostic trouble code.
Check that the combination meter sets a DTC.

Q: Is the DTC set?

YES : Diagnose the SWS system by referring to GROUP

54B, SWS Diagnosis

− Diagnostic Trouble Code

Chart

P.54B-25

.

NO : Go to Step 3.

STEP 3. Using diagnostic tool MB991958, read the
diagnostic trouble code related to the other system.
Check if a DTC, which relates to CAN communication-linked
systems below, is set.
ETACS-ECU

• DTC 021 (U1128): Information on failures in combina-

tion meter via CAN communication

Q: Is the DTC set?

YES : Go to Step 4.
NO : Go to Step 5.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-280

STEP 4. Recheck for diagnostic trouble code.
Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition Switch to "ON" position.
3. Check if the DTC is set.

Q: Is the check result satisfactory?

YES : A poor connection, open circuit or other intermittent

malfunction is present in the lines between the
combination meter and the multi-centre display unit
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points - How to
Cope with Intermittent Malfunction

P.00-14

).

NO : Replace combination meter and then go to step 6.

STEP 5. Recheck for diagnostic trouble code.
Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition Switch to "ON" position.
3. Check if the DTC is set.

Q: Is the check result satisfactory?

YES : A poor connection, open circuit or other intermittent

malfunction is present in the lines between the
combination meter and the multi-centre display unit
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points - How to
Cope with Intermittent Malfunction

P.00-14

).

NO : Replace multi-centre display unit and then go to step

6.

STEP 6. Recheck for diagnostic trouble code.
Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition Switch to "ON" position.
3. Check if the DTC is set.

Q: Is the check result satisfactory?

YES : The procedure is complete.
NO : Go to Step 1.

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-281

DTC 022 (U1130): Failures Information on A/C-ECU

CAUTION

If DTC 022 (U1130) is set in the multi-centre dis-
play, always diagnose the CAN bus lines.

.

CIRCUIT OPERATION

Refer to

P.54A-264

.

.

DTC SET CONDITION

The multi-centre display unit communicates with the
A/C-ECU via CAN bus lines. If the A/C-ECU sends
failure information, DTC 022 (U1130) will be set.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

• The A/C-ECU or the multi-centre display unit

may be defective.

Past trouble

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness between the
A/C-ECU and the multi-centre display unit . For
diagnosis procedures, refer to "How to cope with
past trouble" (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-14

).

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The wiring harness or connectors may have

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

• Malfunction of A/C-ECU

• Malfunction of ambient temperature sensor

• Malfunction of multi-centre display unit

DIAGNOSIS

Required Special Tools:

• MB991958: Diagnostic Tool (MUT-III Sub Assembly)

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

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness A (Vehicles with CAN

communication system)