Mitsubishi 380. Manual - part 187

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-44

STEP 4. Check A/C-ECU connector C-15, C-16 and mode 
selection damper control motor and potentiometer 
connector C-102 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Are A/C-ECU connectors C-15, C-16 and mode selection 

damper control motor and potentiometer connector 
C-102 in good condition?
YES : Go to Step 5.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Then go 

to Step 7.

25DB070A

CONNECTORS: C-15, C-16

C-16 (B)

HARNESS SIDE

C-16

C-15

C-15 (B)

HARNESS SIDE

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

25DB088A

C-102

HARNESS SIDE

CONNECTOR: C-102

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-45

STEP 5. Check the wiring harness between A/C-ECU 
connectors C-15 (terminals 16 and 20), C-21 (terminal 21) 
and mode selection damper control motor and 
potentiometer connector C-102 (terminals 5, 7 and 3).
Q: Are the wiring harnesses between A/C-ECU connectors 

C-10 (terminals 15, 11 and 10) and mode selection 
damper control motor and potentiometer connector 
C-102 (terminals 5, 7 and 3) in good condition?
YES : Go to Step 6.
NO :  Repair the wiring harness. Then go to Step 7.

25DB081A

CONNECTOR: C-10

HARNESS SIDE

C-10 (B)

25DB089A

C-03

C-102

CONNECTORS: C-03, C-102

HARNESS SIDE

C-102

C-03

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-46

STEP 6. Check the mode selection damper control motor 
and potentiometer.

CAUTION

Do not apply battery voltage when the damper is in the 
FACE or DEF position.
(1) Operate the mode selection damper control motor as 

described in the table below.

(2) Measure the resistances between connector terminals 3 

and 5, and between 3 and 7, while the mode selection 
damper control motor is running. The resistances should 
change gradually within the standard value.

Standard value: 0.8 (DEF) 

− 4.8 (FACE) kΩ

Q: Are the mode selection damper control motor and 

potentiometer in good condition?
YES : Replace the A/C-ECU. Then go to Step 7.
NO :  Replace the mode selection damper control motor 

and potentiometer. Then go to Step 7.

LEVER POSITION BATTERY 

CONNECTION

LEVER 
OPERATION

At the FACE 
position

• Connect 

terminal 2 to the 
positive battery 
terminal

• Connect 

terminal 1 to the 
negative battery 
terminal

The lever moves 
from the FACE 
position to the DEF 
position

At the DEF position

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 2 to the 
negative battery 
terminal

The lever moves 
from the DEF 
position to the 
FACE position

25DB066A

FACE POSITION

DEF POSITION

1 2

4

3

5

7

6

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-47

STEP 7. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Connect diagnostic tool  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.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827