Mitsubishi Galant (2004+). Manual - part 1504

MULTI-CENTER DISPLAY

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CHASSIS ELECTRICAL

54A-259

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 
powertrain control module and the multi-center 
display unit (middle grade type) (Refer to GROUP 00, 
How to Use Troubleshooting/Inspection Service 
Points-How to Cope with Intermittent Malfunction 

P.00-6

).

NO :  Replace powertrain control module 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 
powertrain control module and the multi-center 
display unit (middle grade type) (Refer to GROUP 00, 
How to Use Troubleshooting/Inspection Service 
Points-How to Cope with Intermittent Malfunction 

P.00-6

).

NO :  Replace multi-center display unit (middle grade type) 

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

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CHASSIS ELECTRICAL

54A-260

DTC 021: Failures Information on Combination Meter

CAUTION

If DTC 021 is set in the multi-center display, 
always diagnose the CAN bus lines.

.

CIRCUIT OPERATION
 Refer to 

P.54A-238

.

.

DTC SET CONDITION
The multi-center display unit (middle grade type) 
communicates with the combination meter via CAN 
bus lines. If failure information is sent to the combi-
nation meter, DTC 021 will be set.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

• The combination meter or the multi-center display 

unit (middle grade type) 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-center display unit 
(middle grade type). For diagnosis procedures, 
refer to "How to cope with past trouble" (Refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

P.00-6

).

.

TROUBLESHOOTING HINTS

• 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-center display unit (middle 

grade type)

DIAGNOSIS

Required Special Tools:

• MB991958: Scan 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 scan tool MB991958, diagnose the CAN bus 
line.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan 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-14

). On 

completion, go to Step 6.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTI-CENTER DISPLAY

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CHASSIS ELECTRICAL

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STEP 2. Using scan 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-27

.

NO :  Go to Step 3.

STEP 3. Using scan 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: Information on failures in combination meter 

via CAN communication

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 
combination meter and the multi-center display unit  
(middle grade type) (Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points-How to 
Cope with Intermittent Malfunction 

P.00-6

).

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-center display unit 
(middle grade type) (Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points-How to 
Cope with Intermittent Malfunction 

P.00-6

).

NO :  Replace multi-center display unit (middle grade type) 

and then go to step 6.

MULTI-CENTER DISPLAY

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CHASSIS ELECTRICAL

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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 022: Failures Information on A/C-ECU

CAUTION

If DTC 022 is set in the multi-center display, 
always diagnose the CAN bus lines.

.

CIRCUIT OPERATION
 Refer to 

P.54A-245

.

.

DTC SET CONDITION
The multi-center display unit (middle grade type) 
communicates with the A/C-ECU via CAN bus lines. 
If the A/C-ECU sends failure information, DTC 022 
will be set.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

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

(middle grade type) 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-center display unit (mid-
dle grade type). For diagnosis procedures, refer 
to "How to cope with past trouble" (Refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

P.00-6

).

.

TROUBLESHOOTING HINTS

• 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-center display unit (middle 

grade type)

DIAGNOSIS

Required Special Tools:

• MB991958: Scan 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)