Mitsubishi Colt Ralliart. Manual - part 526

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-12

Step 2. M.U.T.-III diagnosis code
Check whether the air conditioner sets a diagnosis 
code or not.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to diagnosis code chart 

P.55A-5

.

Step 3. M.U.T.-III data list
Check that the following service data display con-
tents are normal. (Refer to 

P.55A-44

.)

• Item 04: Pressure sensor

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Inspection Procedure 10: Refer to A/C 
pressure sensor system 

P.55A-41

.

Step 4. Connector check: A-130 A/C compressor 
connector and A-08 engine-CVT-ECU

AC313811

Connector: A-08

AL

Harness side

A-08 (B)

AC313797

Connector: A-130

AB

Harness side

A-130 (B)

Q:  Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector.

Step 5. Voltage measurement at A-130 A/C 
compressor connector.

AC313797

Connector: A-130

AB

Harness side

A-130 (B)

(1) Disconnect the connector, and measure at the 

wiring harness side.

AC313811

Connector: A-08

AL

Harness side

A-08 (B)

AC309471

AC309471

Connector A-08 
(Harness side)

AL

(2) Disconnect engine-CVT-ECU connector A-08 

and earth terminal 6.

Main

Index

Group

TOC

AC310507

Connector A-130 
(Harness side)

EY

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-13

(3) Voltage between terminal 1 and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

 Go to Step 6.

NO : 

Refer to Inspection Procedure 7 " The 
compressor does not work 

P.55A-27

 ".

Step 6. Connector check: B-31 blower switch 
connector and B-15 combination meter 
connector

AC401056

AF

Connectors: B-15, B-31

Harness side

B-15 (B)

B-31 (B)

B-15

Harness side

B-31

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the connector.

Step 7. Check the wiring harness between B-31 
blower switch connector terminal No.1 and B-15 
combination meter connector terminal No.7.

AC401056

AF

Connectors: B-15, B-31

Harness side

B-15 (B)

B-31 (B)

B-15

Harness side

B-31

• Check the blower switch signal line and earth line 

for open or short circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

Main

Index

Group

TOC

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-14

Step 8. Connector check: B-30 heater control 
assembly connector, B-14 and B-15 combination 
meter connector

AC401056

AG

Connectors: B-14, B-15, B-30

Harness side

B-15 (B)

B-30 (B)

B-15

Harness side

B-30

B-14 (B)

Harness side

B-14

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the connector.

Step 9. Check the wiring harness between B-14, 
B-15 combination meter connector (terminals 29, 
35 and 6) and B-30 heater control assembly 
connector (terminals 6, 7 and 10).

AC401056

AG

Connectors: B-14, B-15, B-30

Harness side

B-15 (B)

B-30 (B)

B-15

Harness side

B-30

B-14 (B)

Harness side

B-14

• Check the input line for open or short circuit.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the wiring harness.

Step 10. Refrigerant level check
Check that the refrigerant level is adequate. Refer to 

P.55A-50

.

Q: Is the check result normal?

YES : 

Intermittent malfunction. (Refer to GROUP 

00, How to Cope with Intermittent 
Malfunction 

P.00-13

.)

NO : 

Charge or remove the refrigerant level. 
Refer to 

P.55A-48

 or 

P.55A-48

.

Main

Index

Group

TOC

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-15

Inspection Procedure 4: The blower does not work

Blower Motor Circuit

BLOWER
SWITCH

RESISTOR

BLOWER
MOTOR

FUSIBLE
LINK

6

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

IGNITION
SWITCH (IG2)

BLOWER 
RELAY

COMMENTS ON TROUBLE SYMPTOM

If the blower motor does not operate, the blower 
motor circuit system may be defective.

POSSIBLE CAUSES

• Malfunction of the front blower relay

• Malfunction of the blower motor

• Malfunction of the blower switch

• Damaged the wiring harness or connectors

Main

Index

Group

TOC