Mitsubishi 380. Manual - part 194

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-72

NOTE: Also check junction block connectors C-211(terminal 
16) and C-215 (terminal 2) for loose, corroded, or damaged ter-
minals, or terminals pushed back in the connector. If junction 
block connector C-211 or C-215 is damaged, repair or replace 
the connector as described in GROUP 00E, Harness Connec-
tor Inspection 

P.00E-2

.

Q: Is the wiring harness between outside/inside air 

selection damper control motor connector C-106 
(terminal 1) and the ignition switch (IG2) in good 
condition?
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 

P.00-14

.

NO :  Repair the wiring harness. Check that the 

outside/inside air selection damper control motor 
works normally.

25DB096A

CONNECTORS: C-211, C-215

HARNESS SIDE

C-211

HARNESS SIDE

C-215

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-73

STEP 5. Check the outside/inside air selection damper 
control motor.

CAUTION

Cut off the battery voltage when the damper is in the 
inside/outside air position.
Check the outside/inside air selection damper control motor by 
the following procedures.

Q: Does outside/inside air selection damper control motor 

work normally?
YES : Go to Step 6.
NO :  Replace the outside/inside air selection damper 

control motor. Check that the outside/inside air 
selection damper control motor works normally. 

STEP 6. Check A/C-ECU connector C-15 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is A/C-ECU connector C-15 in good condition?

YES : Go to Step 7.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the outside/inside air selection damper control 
motor works normally.

LEVER POSITION BATTERY 

CONNECTION

LEVER 
OPERATION

At the outside 
position

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 5 to the 
negative battery 
terminal

The lever moves 
from the outside 
position to the 
inside position

At the inside 
position

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 4 to the 
negative battery 
terminal

The lever moves 
from the inside 
position to the 
outside position

25DB067A

OUTSIDE POSITION

INSIDE POSITION

C-106

25DB092A

C-15

CONNECTOR: C-15

HARNESS SIDE

C-15

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-74

STEP 7. Check the wiring harness between outside/inside 
air selection damper control motor connector C-106 
(terminals 5 and 7) and A/C-ECU C-15 (terminals 5 and 6).
Q: Are the wiring harness between outside/inside air 

selection damper control motor connector C-106 
(terminals 4 and 5) and A/C-ECU C-16 (terminals 5 and 
6) in good condition?
YES : Go to Step 8.
NO :  Repair the wiring harness. Check that the 

outside/inside air selection damper control motor 
works normally.

STEP 8. Retest the system.

Q: Does a malfunction take place again?

YES : Replace the A/C-ECU, and check that the 

outside/inside air selection damper control motor 
works normally.

NO :  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 

P.00-14

.

25DB098A

HARNESS SIDE

C-15

CONNECTORS: C-15, C-106

C-106

HARNESS SIDE

C-106

C-15 (B)

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-75

INSPECTION PROCEDURE 4: When the A/C is Operating, Temperature Inside the Passenger 
Compartment does not Decrease (Cool Air is not Emitted).

.

TECHNICAL DESCRIPTION (COMMENT)

If cool air is not distributed when the A/C switch is on, 
the A/C compressor relay system may be defective. 

.

TROUBLESHOOTING HINTS

• Improper amount of refrigerant

• Malfunction of the air thermo sensor 

• Malfunction of the ambient air temperature sen-

sor

• Malfunction of the A/C pressure sensor

• Malfunction of the A/C compressor relay

• Malfunction of the A/C refrigerant temperature 

switch

• Malfunction of the air conditioning compressor 

clutch

• Malfunction of the A/C-ECU

• Malfunction of the ECU

• Damaged harness wires or connectors

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

•  : Scan Tool (MUT-III Sub Assembly)

AC305210

CONNECTOR: A-13

AS

A-13 (GR)

AC305977AK

CONNECTOR: B-18X

25DB148A

B-20

CONNECTOR: B-20

AC305218

B-28 (B)

AC

CONNECTOR: B-28 <3.8 L>

25DB101A

CONNECTORS: C-214, C-215

JUNCTION BLOCK 

(FRONT VIEW)

C-215

C-214

25DB092A

C-15

CONNECTOR: C-15

HARNESS SIDE

C-15