Mitsubishi 380. Manual - part 935

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-274

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 ETACS-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 ETACS-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 ETACS-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 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.

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CHASSIS ELECTRICAL

54A-275

DTC 020 (U1120): Failures Information on Engine ECU

CAUTION

If DTC 20 is set in the multi-centre display, 
always diagnose the CAN bus lines.

.

CIRCUIT OPERATION

 Refer to 

P.54A-255

.

.

DTC SET CONDITION

The multi-centre display unit  communicates with the 
Engine ECU via CAN bus lines. If failure information 
is sent to the multi-centre display unit , DTC 20 will 
be set.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

• The Engine 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 
Engine ECU and the vehicle speed sensor. 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 Engine ECU

• Malfunction of multi-centre display unit 

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54A-276

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 system 
diagnostic trouble code.
Check if an MPI system DTC is set.

Q: Is the DTC set?

YES : Diagnose the MPI system by referring to GROUP13A, 

MPI Diagnosis 

− Diagnostic Trouble Code Chart 

P.13A-17

.

NO :  Go to Step 3.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

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CHASSIS ELECTRICAL

54A-277

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 U1120: Failure information on Engine ECU (related 

to engine) <vehicles with TCL>

Combination meter

• DTC 020 (U1120): Failure information on Engine ECU 

(related to engine)

A/C-ECU

• DTC U1120: Failure information on Engine ECU (related 

to engine)

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 lines between the Engine 
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 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 

malfunction is present in the lines between the Engine 
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 multi-centre display unit  and then go to step 

6.