Mitsubishi 380. Manual - part 879

 

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Mitsubishi 380. Manual - part 879

 

 

COMBINATION METER ASSEMBLY

CHASSIS ELECTRICAL

54A-50

DIAGNOSIS

Required Special Tools:

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

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

• MB991827: MUT-III USB Cable

• MB991910: 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-405

). 

STEP 2. 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 : An intermittent malfunction is suspected. Refer to 

GROUP 00, How to Use Troubleshooting/Inspection 
Service Points - How to Cope with Intermittent 
Malfunction 

P.00-14

.

NO :  Replace combination meter. 

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

COMBINATION METER ASSEMBLY

CHASSIS ELECTRICAL

54A-51

DTC U1100: Engine ECU Time-out (Related to Engine) DTC U1101: Auto Transmission ECU Time-out 
(Related to A/T)

CAUTION

If DTC U1100 or U1101 is set in the combination 
meter, 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-49

.

.

DTC SET CONDITION

U1100

• The combination meter receives engine control 

system-related signals from the Engine ECU via 
CAN bus lines. If the display unit can not receives 
the necessary signals, DTC U1100 will be set.

U1101

• The combination meter receives A/T control sys-

tem-related signal from the Auto Transmission 
ECU via CAN bus lines. If the display unit can not 
receive the necessary signals, DTC 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) 
017 and 018 may be set on the combination 
meter (incorporating meter-ECU) after three min-
utes.

Current trouble

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

lines between the Engine ECU and the combina-
tion meter, the power supply system to the 
Engine ECU, the Engine ECU itself, or the combi-
nation 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 Engine ECU and the combina-
tion meter, and the power supply system to the 
Engine 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-

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 Auto Transmission ECU

• Malfunction of combination meter

16DB407A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

A/T

CONTROL

UNIT

COMBINATION METER ASSEMBLY

CHASSIS ELECTRICAL

54A-52

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 the 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 GROUP 

13A, MPI Diagnosis 

− Diagnostic Trouble Code Chart 

P.13A-17

.

NO :  Go to Step 3.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

COMBINATION METER ASSEMBLY

CHASSIS ELECTRICAL

54A-53

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 (related to Engine) 

<vehicles with TCL>

• DTC U1101: Auto Transmission ECU time-out (related 

to automatic transmission) <vehicles with TCL>

Multi-centre display

• DTC 011: Engine ECU time-out (related to Engine)

• DTC 012: Auto Transmission ECU time-out (related to 

A/T)

ETACS-ECU

• DTC 011: Engine ECU time-out (related to Engine)

• DTC 012: Auto Transmission ECU time-out (related to 

A/T)

A/C-ECU

• DTC U1100: Engine ECU time-out (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 CAN bus lines between 
the Engine ECU and the combination meter (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 CAN bus lines between 
the Engine ECU and the combination meter (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.

 

 

 

 

 

 

 

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