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Mitsubishi 380. Manual - part 931

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-258

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 to Step 6.

STEP 2. Using diagnostic tool MB991958, read MPI
diagnostic trouble code
Check if an MPI system DTC is set.

Q: Is the DTC set?

YES : Diagnose the MPI system by referring to GROUP

13A, Diagnosis

− Diagnostic Trouble Code Chart

P.13A-17

NO : Go to Step 3.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-259

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.
ABS-ECU

• DTC U1100: Engine ECU time-out <vehicles with TCL>

Combination meter

• DTC 011 (U1100): Engine-ECU time-out

ETACS-ECU

• DTC 011 (U1100): Engine-ECU time-out

A/C-ECU

• DTC U1100: Engine-ECU time-out

Q: Is the DTC set?

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

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 Engine ECU and the middle-grade 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 Engine 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

P.00-14

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

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-260

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 012 (U1101): A/T ECU Time-out

CAUTION

If DTC 012 (U1101) 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

DTC 012 (U1101)

• The multi-centre display unit receives A/T control

system-related signals from the A/T-ECU via
CAN bus lines. If the display unit can not receive
the necessary signals, DTC 012 (U1101) will be
set.

TECHNICAL DESCRIPTION (COMMENT)

CAUTION

If the ignition switch is turned to the ON position
without starting the engine, DTC (past trouble)
013 (U1110) and 014 (U1108) may be set on the
combination meter (incorporating meter-ECU)
after three minutes.

Current trouble

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

lines between the A/T-ECU and the multi-centre
display unit, the power supply system to the dis-
play unit, the display unit itself, or the A/T-ECU
may be defective.

Past trouble

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness in the CAN bus
lines between the A/T-ECU and the multi-centre
display unit, and the power supply system to the
A/T-ECU. For diagnosis procedures, refer to
"How to cope with past trouble" (Refer to GROUP
00, How to Use Troubleshooting/Inspection Ser-
vice 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 failure in CAN bus lines. In this case, refer to
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points - How to Cope with Intermit-
tent Malfunction

P.00-14

.) and check the CAN

bus lines. You can narrow down the possible
cause of the trouble by referring to the DTC,
which is set regarding the CAN communica-
tion-linked ECUs (Refer to GROUP 54C, CAN
bus line Diagnostics Flow

P.54C-6

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• The wiring harness or connectors may have

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

• Malfunction of A/T-ECU.

• Malfunction of multi-centre display unit

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-261

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 to Step 6.

STEP 2. Using diagnostic tool MB991958, read A/T
diagnostic trouble code
Check if an A/T system DTC is set.

Q: Is the DTC set?

YES : Diagnose the A/T system by referring to GROUP 23A,

Diagnosis