Mitsubishi Galant 9G. Manual — part 1594

MULTI-CENTER DISPLAY

TSB Revision

CHASSIS ELECTRICAL

54A-248

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.00-14

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

P.00-14

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.

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-232

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.

MULTI-CENTER DISPLAY

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CHASSIS ELECTRICAL

54A-249

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.00-14

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)

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 5.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTI-CENTER DISPLAY

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CHASSIS ELECTRICAL

54A-250

STEP 2. Using scan tool MB991958, read A/C-ECU
diagnostic trouble code.
Check if an A/C-ECU DTC is set.
Q: Is the DTC set?

YES : Refer to GROUP 55A, Manual A/C Diagnosis

−

Diagnostic Trouble Code Chart <Low Type>

P.55A-10

or Diagnostic Trouble Code Chart <Middle
Type>

P.55A-58

or Auto A/C Diagnostic Trouble Code

Chart

P.55B-8

and then Go to Step 3.

NO : Go to Step 4.

STEP 3. 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
A/C-ECU 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.00-14

NO : Replace A/C-ECU and then go to step 4.

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

P.00-14

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

and then go to step 5.

MULTI-CENTER DISPLAY

TSB Revision

CHASSIS ELECTRICAL

54A-251

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 : The procedure is complete. (If no malfunctions are

found in all steps, 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 : Go to Step 1.

DIAGNOSIS

M1543007201127

SYMPTOM CHART

CAUTION

During diagnosis, a DTC code associated with
other system may be set when the ignition switch
is turned on with connector(s) disconnected. On
completion, confirm all systems for DTC code(s).
If DTC code(s) are set, erase them all.

SYMPTOM

INSPECTION
PROCEDURE

REFERENCE
PAGE

Communication with scan tool is not possible. (Middle Grade Type)

P.54A-252

The multi-center display does not show any information. (Middle Grade
Type)

P.54A-255

The multi-center display does not show any information. (Low Grade
Type)

P.54A-255

The A/C display shows "COMMUNICATION ERROR", and then can not
proceed to next screen. (Middle Grade Type)

P.54A-264

The ambient air temperature display shows "COM ERROR" or "