Mitsubishi 380. Manual - part 208

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-128

STEP 9. Check the wiring harness between A/C-ECU 
connector C-16 (terminal 27) and the ground.
Q: Is the wiring harness between A/C-ECU connector C-16 

(terminal 27) and ground 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

. check 

that the air conditioning works normally.

NO :  Repair the wiring harness. Check that the air 

conditioning works normally.

INSPECTION PROCEDURE 12: When Sunlight Intensity Changes, Air Outlet Temperature Does Not 
Change.

.

CIRCUIT OPERATION

When the blower air temperature cannot be changed 
even if the preset temperature is changed, the sen-
sors may be defective.

.

TROUBLESHOOTING HINTS

• Improper amount of refrigerant

• Malfunction of the A/C pressure sensor

• Malfunction of the photo sensor

• Malfunction of the A/C-ECU

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

25DB132A

HARNESS SIDE

C-16 (B)

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27

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CONNECTOR: C-16

25DB135A

C-04

CONNECTORS: C-04

25DB068A

C-16 (B)

C-15 (B)

CONNECTORS: C-15, C-16

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-129

DIAGNOSIS

Required Special Tools:

•  : 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. Check the defogger and outside/inside air 
selection damper control motor operation.

Q: Do the defogger and outside/inside air selection damper 

control motor work normally?
YES : Go to Step 2.
NO :  Refer to GROUP 55, AUTO A/C Diagnosis, 

P.55-70

.

STEP 2. Using scan tool , read diagnostic trouble code.

CAUTION

To prevent damage to scan tool , always turn the ignition 
switch to the "LOCK" (OFF) position before connecting or 
disconnecting scan tool .
Check if an A/C-ECU DTC is set.

1. Connect scan 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 DTC set?

YES : Refer to 

P.55-9

.

NO :  Go to Step 3.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-130

STEP 3. Using scan tool , check data list item 67: Photo 
sensor.
(1) Connect scan tool  to the data link connector.
(2) Start the engine.
(3) Set scan tool  to the data reading mode for item 67: Photo 

sensor.

• Check that the display on the scan tool changes when 

the photo sensor is covered with hands.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor within the specified range?

YES : Go to Step 7.
NO :  Go to Step 4.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-131

STEP 4. Check A/C-ECU connectors C-15, C-16 and photo 
sensor connector C-04 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q:  Are A/C-ECU connectors C-15, C-16 and photo sensor 

connector C-04 in good condition?
YES : Go to Step 5.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the air conditioning works normally.

25DB136A

CONNECTOR: C-04

HARNESS SIDE

25DB070A

CONNECTORS: C-15, C-16

C-16 (B)

HARNESS SIDE

C-16

C-15

C-15 (B)

HARNESS SIDE

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