Mitsubishi 380. Manual - part 198

 

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Mitsubishi 380. Manual - part 198

 

 

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-88

STEP 21. Check the A/C pressure sensor operation.
(1) Assemble a gauge manifold on the high pressure service 

valve.

(2) Disconnect the A/C pressure sensor connector and connect 

special tool test harness MB991658 as shown in the 
illustration.

(3) Turn ON the engine and then turn ON the air conditioner 

switch.

(4) At this time, check to see that the voltage of A/C pressure 

sensor terminal No. 2 reflects the specifications of the 
figure.

NOTE: The allowance shall be defined as 

±5%.

Q: Is the A/C pressure sensor operating properly?

YES : Go to Step 22.
NO :  Replace the A/C pressure sensor. Check that the air 

conditioning works normally.

STEP 22. Check the refrigerant level.
Use the refrigerant recovery station to remove all of the refrig-
erant, and then calculate the amount of the refrigerant and 
charge it.

Q: Is the refrigerant level correct?

YES : Go to Step 23.
NO :  Correct the refrigerant level (Refer to On-vehicle 

Service 

P.55-144

). Check that the air conditioning 

works normally. 

STEP 23. Replace the A/C-ECU.

Q: Does the A/C operate normally?

YES : The procedure is complete.
NO :  Replace the powertrain control module. Check that 

the air conditioning works normally. 

AC305034

A/C PRESSURE SENSOR

AD

AC307368

A/C 
PRESSURE 
SENSOR 
SIDE

MB991658

AB

HARNESS SIDE

AC208297AB

REFRIGERANT PRESSURE (MPa)

OUTPUT VOLTAGE 

(V)

0

1

2

3

5
4

1

2

3

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-89

INSPECTION PROCEDURE 5: Front Blower Fan and Motor do not Turn.

.

CIRCUIT OPERATION

If the blower motor does not operate, the blower 
relay system is suspected.

.

TROUBLESHOOTING HINTS

• Malfunction of the front blower relay

• Malfunction of the power transistor

• Malfunction of the front blower motor

• Malfunction of the A/C-ECU

• Damaged harness wires or connectors

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

AC305015AH

FUSIBLE LINK (1)

FUSIBLE LINKS 
NO.1

25DB106A

CONNECTORS: C-115

C-115

25DB107A

CONNECTOR: C-29

25DB108A

CONNECTORS: C-202, C-211, C-215, C-216

JUNCTION BLOCK 

(FRONT VIEW)

C-216 (B)

C-215

C-202

C-211

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-90

DIAGNOSIS

Required Special Tool:

• MB991223: Test Harness Set

STEP 1. Check blower motor connector C-115 and 
A/C-ECU connector C-15 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Are blower motor connector C-115 and A/C-ECU 

connector C-15 in good condition?
YES : 
Go to Step 2.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.The 

blower motor should operate normally.

25DB109A

CONNECTORS: C-15, C-115

HARNESS SIDE

C-15

C-115

HARNESS SIDE

C-115

C-15 (B)

AUTO A/C DIAGNOSIS

HEATER, AIR CONDITIONING AND VENTILATION

55-91

STEP 2. Measure the voltage at blower motor connector 
C-115. 
(1) Disconnect blower motor connector C-115, and measure 

the voltage at the wiring harness side.

(2) Disconnect A/C-ECU connector C-15 and ground harness 

side terminal No.9.

(3) Turn the ignition switch to the "ON" position.

(4) Measure the voltage between C-115 (terminal 1) and 

ground.

• The measured value should be approx. 12 volts (battery 

positive voltage).

Q: Is the measured voltage approx. 12 volts?

YES :  Go to Step 11.
NO :   Go to Step 3.

STEP 3. Check blower relay connector C-202 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is blower relay connector C-202 in good condition?

YES : Go to Step 4.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.The 

blower motor should operate normally.

25DB110A

CONNECTOR: C-115

HARNESS SIDE

AC306911

AC306911AB

CONNECTOR C-15 
(HARNESS SIDE)

AC209365

CONNECTOR C-115 
(HARNESS SIDE)

GW

25DB111A

CONNECTOR: C-202

JUNCTION BLOCK SIDE

JUNCTION BLOCK 

(FRONT VIEW)

 

 

 

 

 

 

 

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