Mitsubishi Galant 9G. Manual — part 233
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-8
HOW TO PERFORM ACTUATOR TEST
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect the scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "Air Conditioner" from the "BODY" tab.
6. Select "MITSUBISHI."
7. Choose "Actuator Test" from "AUTO A/C" screen.
8. Choose an appropriate item and select the "OK" button.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-9
HOW TO DIAGNOSE THE CAN BUS LINE
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it
matches the vehicle whose CAN bus lines will be
diagnosed.
• If they matches, go to step 8.
• If not, go to step 5.
5. Select "view vehicle information" button.
6. When the vehicle information is displayed, confirm again
that it matches the vehicle which is diagnosed CAN bus line.
• If they match, go to step 8.
• If not, go to step 5.
7. Press the "OK" button.
8. When the options are displayed, choose the options (mark
the check) and then select "OK".
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-10
DIAGNOSTIC TROUBLE CODE CHART <LOW TYPE>
M1554004900203
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.
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)
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)
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-11
DIAGNOSTIC TROUBLE CODE PROCEDURES <LOW 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.
AMBIENT AIR
TEMPERATURE
SENSOR
JOINT
CONNECTOR (2)
A/C-ECU
Ambient Temperature Sensor Circuit
AC305210
A-25 (BR)
AQ
CONNECTOR: A-25
AC305231AZ
CONNECTOR: C-03
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