Mitsubishi Galant (2004+). Manual — part 1505
MULTI-CENTER DISPLAY
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CHASSIS ELECTRICAL
54A-263
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
completion, go to Step 5.
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>
or Diagnostic Trouble Code Chart <Middle
Type>
or Auto A/C Diagnostic Trouble Code
Chart
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
).
NO : Replace A/C-ECU and then go to step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTI-CENTER DISPLAY
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CHASSIS ELECTRICAL
54A-264
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
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
).
NO : Replace multi-center display unit (middle grade type)
and then go to step 5.
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
).
NO : Go to Step 1.
MULTI-CENTER DISPLAY
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CHASSIS ELECTRICAL
54A-265
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)
1
The multi-center display does not show any information. (Middle Grade
Type)
2
The multi-center display does not show any information. (Low Grade
Type)
3
The A/C display shows "COMMUNICATION ERROR", and then can not
proceed to next screen. (Middle Grade Type)
4
The ambient air temperature display shows "COM ERROR" or "
−−deg°C
(
−−°F). (Middle Grade Type)
5
On the audio screen, "COMMUNICATION ERROR" can not proceed to
next screen. (Middle Grade Type)
6
The compass can not be calibrated manually, or becomes out of
calibration easily. (Middle Grade Type)
7
MULTI-CENTER DISPLAY
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CHASSIS ELECTRICAL
54A-266
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1:Communication With Scan Tool Is Not Possible. (Middle Grade Type)
WITHOUT ELECTRONIC
BRAKE-FORCE
DISTRIBUTION (EBD)
AND ANTI-LOCK
BRAKING SYSTEM
(ABS)
WITHOUT ELECTRONIC
BRAKE-FORCE
DISTRIBUTION (EBD)
AND ANTI-LOCK
BRAKING SYSTEM
(ABS)
WITH ELECTRONIC
BRAKE-FORCE
DISTRIBUTION (EBD)
AND ANTI-LOCK
BRAKING SYSTEM
(ABS)
WITH ELECTRONIC
BRAKE-FORCE
DISTRIBUTION (EBD)
AND ANTI-LOCK
BRAKING SYSTEM
(ABS)
ABS-ECU OR ABS/TCL-ECU
JOINT
CONNECTOR (3)
POWERTRAIN
CONTROL MODULE
COMBINATION
METER
MULTI-CENTER DISPLAY UNIT
DATA LINK CONNECTOR
CPU
Data LInk Connector Circuit
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