Mitsubishi Galant 9G. Manual — part 252
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-84
STEP 7. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Connect scan tool MB991958 to the data link connector
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?
YES : The procedure is complete.
NO : Return to Step 1.
DTC B1061, B1062: Mode Selection Damper Control Motor and Potentiometer
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MODE SELECTION
DAMPER CONTROL
MOTOR AND
POTENTIOMETER
JOINT
CONNECTOR (2)
A/C-ECU
Mode Selection Damper Control Motor Potentiometer Circuit
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-85
.
DTC SET CONDITION
• DTC B1061 or B1062 is set if there is an open or
short circuit in the potentiometer input circuit, or if
there is an open in the power circuit or ground cir-
cuit.
.
TECHNICAL DESCRIPTION (COMMENT)
Current trouble
• The A/C-ECU, the mode selection damper con-
trol motor and potentiometer, or connector(s) or
wiring between the two may be defective.
Past trouble
• If DTC B1061 or B1062 is stored as a past trou-
ble, carry out diagnosis with particular emphasis
on wiring and connector(s) between the A/C-ECU
and the mode selection damper control motor
and potentiometer. If the connectors and wiring
are normal, and obviously the ECU is the cause
of the trouble, replace the ECU. If in doubt, do not
replace the ECU.
TROUBLESHOOTING HINT
• Malfunction of connector.
• Malfunction of the harness.
• Malfunction of the mode selection damper control
motor and potentiometer.
• Malfunction of the A/C-ECU.
AC305233
C-16 (B)
C-15 (B)
CONNECTORS: C-15, C-16
BE
AC305231CG
CONNECTOR: C-03, C-102
C-03
C-102
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-86
DIAGNOSIS
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)
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
Then go to Step 7.
STEP 2. 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 : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
NO : Go to Step 3.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-87
STEP 3. Using scan tool MB991958, check data list item 12:
Air outlet c/o potentiometer.
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) Start the engine.
(3) Set scan tool MB991958 to the data reading mode for item
12: Air outlet c/o potentiometer.
• Check that the set position of the heater control matches
the displayed position on the scan tool.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor within the specified range?
YES : Replace the A/C-ECU. Then go to Step 7.
NO : Go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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