Mitsubishi Colt Ralliart. Manual — part 661

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-5

DIAGNOSIS PROCEDURE

Step 1. M.U.T.-III data list
Check that the following service data display con-
tents are normal. (Refer to

P.55B-24

).

• Item 01: Inside temperature sensor

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 2.

Step 2. Connector check: B-15 combination
meter connector and B-28 interior temperature
sensor connector

AC313823AJ

Harness side

B-15 (B)

B-28 (B)

B-15

B-28

Harness side

Connectors: B-15, B-28

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the connector.

Step 3. Check the wiring harness between B-15
combination meter connector (terminals 7 and
15) and B-28 interior temperature sensor
connector (terminals 2 and 1).

AC313823AJ

Harness side

B-15 (B)

B-28 (B)

B-15

B-28

Harness side

Connectors: B-15, B-28

• Check the sensor signal line and earth line 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 interior temperature sensor.
Refer to

P.55B-34

.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Replace the interior temperature sensor.

Step 5. Check whether the diagnosis code is
reset.

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-6

Code No.B1041,B1042: Potentiometer system for the air mix damper

COMBINATION
METER

SENSOR CIRCUIT

METER AND A/C-ECU

AIR MIXING DAMPER
CONTROL MOTOR AND
POTENTIOMETER

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

Air Mixing Damper Control Motor And Potentiometer Circuit

DIAGNOSIS CODE SET CONDITION

This code is set when the air mixing damper control
motor potentiometer does not send any signal to the
A/C-ECU due to short or open circuit.

POSSIBLE CAUSES

• Malfunction of the air mixing damper control

motor and potentiometer

• Damaged the wiring harness or connectors

• Malfunction of the combination meter (meter and

A/C-ECU)

DIAGNOSIS PROCEDURE

Step 1. M.U.T.-III data list
Check that the following service data display con-
tents are normal. (Refer to

P.55B-24

).

• Item 10: Air mix potentiometer

• Item 11: Air mix potentiometer (Target)

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 2.

Step 2. Connector check: B-14 and B-15
combination meter connector and B-12 air
mixing damper control motor and potentiometer
connector

AC313823AK

Connectors: B-12, B-14, B-15

Harness side

B-15 (B)

B-12

B-15

Harness side

B-12

B-14 (B)

Harness side

B-14

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the connector.

Main

Index

Group

TOC

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-7

Step 3. Check the wiring harness between B-14
and B-15 combination meter connector
(terminals 15, 5 and 30) and B-12 air mixing
damper control motor and potentiometer
connector (terminals 7, 3 and 5).

AC313823AK

Connectors: B-12, B-14, B-15

Harness side

B-15 (B)

B-12

B-15

Harness side

B-12

B-14 (B)

Harness side

B-14

• Check the potentiometer power supply, earth and

signal line 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.

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-8

Code No.B1045: Motor drive system for the air mix damper

AIR MIXING DAMPER CONTROL
MOTOR AND POTENTIOMETER

AIR MIXING DAMPER
CONTROL MOTOR
DRIVE CIRCUIT

METER AND A/C-ECU

COMBINATION
METER

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

Air Mix Damper Control Motor And Potentiometer Circuit

DIAGNOSIS CODE SET CONDITION

This code is set when the air mixing damper cannot
be rotated to the preset opening angle.

POSSIBLE CAUSES

• Malfunction of the air mixing damper control

motor and potentiometer

• Malfunction of the combination meter (meter and

A/C-ECU)

• Damaged the wiring harness or connectors

DIAGNOSIS PROCEDURE

Step 1. M.U.T.-III actuator test
Check that the following actuator test can be exe-
cuted normally. (Refer to

P.55B-25

)

• Item 10: Air mix dumper motor: 0%

• Item 11: Air mix dumper motor: 50%

• Item 12: Air mix dumper motor: 100%

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 2.

Step 2. Connector check: B-15 combination
meter connector and B-12 air mixing damper
control motor and potentiometer connector

AC313823 AL

Connectors: B-12, B-15

Harness side

B-15 (B)

B-12

B-15

Harness side

B-12

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the connector.

Main

Index

Group

TOC