Mitsubishi 380. Manual — part 933

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-266

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 the A/C
diagnostic trouble code
Check if an A/C system DTC is set.

Q: Is the DTC set?

YES : Diagnose the A/C system by referring to GROUP 55,

Auto A/C Diagnostic Trouble Code Chart

P.55-9

.

NO : Go to Step 3.

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

• DTC U1110: A/C-ECU time-out

ETACS-ECU

• DTC 013 (U1110): A/C-ECU time-out

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-267

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 CAN bus lines between
the A/C-ECU 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 A/C-ECU 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 CAN bus lines between
the A/C-ECU 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 the 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-268

DTC 014 (U1108): Combination Meter Time-out

CAUTION

If DTC 014 (U1108) is set in the multi-centre dis-
play, always diagnose the CAN bus lines.

CAUTION

Whenever the ECU is replaced, ensure that the
communication circuit is normal.

.

CIRCUIT OPERATION

Refer to

P.54A-255

.

.

DTC SET CONDITION

The multi-centre display unit receives signals from
the combination meter via CAN bus lines. If the dis-
play unit can not receive the necessary combination
meter signals, DTC 014 (U1108) will be set.

.

TECHNICAL DESCRIPTION (COMMENT)

CAUTION

If the ignition switch is turned to the ON position
without starting the engine, DTC (past trouble)
011 (U1100), 012 (U1101) and 013 (U1110) may be
set to the combination meter (incorporating
meter-ECU) after three minutes.

Current trouble

• Connector(s) or wiring harness in the CAN bus

lines between the combination meter and the
multi-centre display unit , the power supply sys-
tem to the display unit, the display unit itself, or
the combination meter may be defective.

Past trouble

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness in the CAN bus
lines between the combination meter and the
multi-centre display unit , the power supply sys-
tem to the display unit. For diagnosis procedures,
refer to "How to cope with past trouble" (Refer to
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points

P.00-14

).

NOTE: For a past trouble, you may not find it by the
MUT-III CAN bus diagnostics even if there is any fail-
ure in CAN bus lines. In this case, refer to GROUP
00, How to Use Troubleshooting/Inspection Service
Points - How to Cope with Intermittent Malfunction

P.00-14

.) and check the CAN bus lines. You can nar-

row down the possible cause of the trouble by refer-
ring to the DTC, which is set regarding the CAN
communication-linked ECUs (Refer to GROUP 54C,
CAN bus line Diagnostics Flow

P.54C-6

).

.

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

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-269

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)

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 Step 5.

STEP 2. 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.
Engine ECU

• DTC U1108: Combination meter time-out

ETACS-ECU

• DTC 014 (U1108): Combination meter time-out

Q: Is the DTC set?

YES : Go to Step 3.
NO : Go to Step 4.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827