Mitsubishi Colt Ralliart. Manual - part 662

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-9

Step 3. Check the wiring harness between B-15 
combination meter connector (terminals 11 and 
18) and B-12 air mixing damper control motor 
and potentiometer connector (terminals 1 and 2).

AC313823 AL

Connectors: B-12, B-15

Harness side

B-15 (B)

B-12

B-15

Harness side

B-12

• Check the motor activating lines for open or short 

circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

Step 4. Check the air mixing damper control 
motor and potentiometer.
Refer to 

P.55B-34

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the air mixing damper control 
motor and potentiometer.

Step 5. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Ignition switch: LOCK (OFF) position to ON
(2) Erase the diagnosis code.
(3) Turn the temperature adjusting knob to MAX 

COOL for 16 seconds, and then turn to MAX 
HOT for 16 seconds.

(4) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the combination meter (meter and 

A/C-ECU).

NO : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction 

P.00-13

).

Main

Index

Group

TOC

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-10

Code No.B1081 Communication error with control parts

METER AND A/C-ECU

A/C CONTROL CIRCUIT

COMBINATION
METER

POWER SOURCE

A/C
SWITCH

TEMPER-
ATURE
CONTROL
KNOB

BLOW
CONTROL
KNOB

OUTSIDE/INSIDE
AIR SELECTION
SWITCH

HEATER
CONTROL
ASSEMBLY

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

Combination Meter and Heater Control Assembly Circuit

DIAGNOSIS CODE SET CONDITION

This diagnosis code is set when the combination 
meter (meter and A/C-ECU) can not receive the data 
from the heater control.

POSSIBLE CAUSES

• Malfunction of the heater control assembly

• Damaged the wiring harness or connectors

• Malfunction of the combination meter (meter and 

A/C-ECU)

Main

Index

Group

TOC

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-11

DIAGNOSIS PROCEDURE

Step 1. Connector check: B-14, B-15 combination 
meter connector and B-30 heater control 
assembly connector

AC313823AR

Connectors: B-14, B-15, B-30

Harness side

B-15 (B)

B-30

B-15

Harness side

B-12

B-14 (B)

Harness side

B-14

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the connector.

Step 2. Check the wiring harness between B-14, 
B-15 combination meter connector (terminals 3, 
29 and 35) and B-30 heater control assembly 
(terminals 2, 1 and 9).

AC313823AR

Connectors: B-14, B-15, B-30

Harness side

B-15 (B)

B-30

B-15

Harness side

B-12

B-14 (B)

Harness side

B-14

• Check the heater control signal line and earth line 

for open or short circuit.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the wiring harness.

Step 3. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction 

P.00-13

).

Step 4. Replace the heater control assembly and 
recheck the trouble symptom

Q: Is the check result normal?

YES : 

This diagnosis is complete.

NO : 

Replace the combination meter (meter and 
A/C-ECU).

Main

Index

Group

TOC

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-12

TROUBLE SYMPTOM CHART

M1554005000838

Trouble symptom

Inspection procedure 
number

Reference page

The outlet air temperature can not be changed even if 
the amount of solar radiation changes

1

P.55B-12

The blower does not work

2

P.55B-14

The blower air volume cannot be changed

3

P.55B-21

SYMPTOM PROCEDURES

Inspection Procedure 1: The outlet air temperature can not be changed even if the amount of solar 
radiation changes

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

PHOTO SENSOR

COMBINATION
METER

SENSOR CIRCUIT

METER AND A/C-ECU

Photo Sensor Circuit

CIRCUIT OPERATION

When the blower air temperature can not be 
changed even if the amount of solar radiation is 
changed, the photo sensor may be defective. 

POSSIBLE CAUSES

• Malfunction of photo sensor

• Damaged harness wires and connectors

• Malfunction of the combination meter (meter and 

A/C-ECU)

DIAGNOSIS PROCEDURE

Step 1. 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 2.

NO : 

Refer to diagnosis code chart 

P.55B-3

.

Main

Index

Group

TOC