Mitsubishi Galant 9G. Manual — part 245
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-56
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MUT-III), always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool (MUT-III).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
STEP 2. Using scan tool MB991958, read the powertrain
control module diagnostic trouble code.
Check whether any engine or automatic transmission DTCs are
set or not.
(1) Turn the ignition switch to the "ON" position.
(2) Check for engine and automatic transmission DTCs.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?
YES : Go to Step 3.
NO : Refer to GROUP 13A, Diagnostic Trouble Code
<2.4L> or GROUP 13B, Diagnostic Trouble
Code
<3.8L>.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-57
STEP 3. Using scan tool MB991958, check for any
diagnostic trouble code.
Check if a DTC, which relates to CAN communication-linked
systems below, is set.
• Combination meter
DTC indicating a time-out error related to the engine or
automatic transmission control system
• ETACS
DTC indicating a time-out error related to the engine or
automatic transmission control system
• Multi-center display unit (middle grade type)
DTC indicating a time-out error related to the engine or
automatic transmission control system
(1) Turn the ignition switch to the "ON" position.
(2) Check for a DTC related to the relevant system.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?
YES : Replace the powertrain control module. On
completion, check that the DTC is not reset.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions
).
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-58
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
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 A/C-ECU (Refer to
GROUP 00, How to Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions
.)
NO : Replace the A/C-ECU. On completion, check that the
DTC is not reset.
DIAGNOSTIC TROUBLE CODE CHART <MIDDLE TYPE>
M1554004900214
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 of repairs, confirm all systems for
DTC code(s). If DTC code(s) are set, erase them
all.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
DIAGNOSTIC
TROUBLE CODE
NO.
DIAGNOSTIC ITEM
REFERENCE
PAGE
B1011
Ambient air temperature sensor system (short circuit)
B1012
Ambient air temperature sensor system (open circuit)
B1021
Air thermo sensor system (short circuit)
B1022
Air thermo sensor system (open circuit)
B1041
Air mixing damper control motor and potentiometer (potentiometer
system shorted to its power supply)
B1042
Air mixing damper control motor and potentiometer (potentiometer
system shorted to its ground)
B1045
Air mixing damper control motor and potentiometer (activating
system failure)
B1061
Mode selection damper control motor and potentiometer
(potentiometer system shorted to its power supply)
B1062
Mode selection damper control motor and potentiometer
(potentiometer system shorted to its ground)
MANUAL A/C DIAGNOSIS
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HEATER, AIR CONDITIONING AND VENTILATION
55A-59
DIAGNOSTIC TROUBLE CODE PROCEDURES <MIDDLE TYPE>
DTC B1011, B1012: Ambient Air Temperature Sensor System
CAUTION
If DTC B1011 or B1012 has been set, multi-dis-
play related DTC U1130 is also set. After B1011 or
B1012 has been diagnosed, don't forget to erase
DTC U1130.
B1065
Mode selection damper control motor and potentiometer (activating
system failure)
U1073
Bus off
U1100
Powertrain control module time-out (related to engine)
U1111
Multi-center display unit (middle grade type) time-out
U1120
Failure information on powertrain control module (related to engine)
DIAGNOSTIC
TROUBLE CODE
NO.
DIAGNOSTIC ITEM
REFERENCE
PAGE
AMBIENT AIR
TEMPERATURE
SENSOR
JOINT
CONNECTOR (2)
A/C-ECU
Ambient Temperature Sensor Circuit
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