Mitsubishi Grandis. Manual - part 287

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-33

YES : 

Go to Step 3.

NO : 

Repair the connector.

Step 3. Check the wiring harness between C-106 
A/C-ECU connector (terminals 1, 21 and 14) and 
C-04 mode selection damper control motor and 
potentiometer connector (terminals 7, 3 and 5).

NOTE: Prior to the wiring harness inspection, check 
joint connector C-01, and repair if necessary.

• 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 mode selection damper control 
motor and potentiometer.

Refer to 

P.55-208

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the mode selection damper control 
motor and potentiometer.

Step 5. MUT-III diagnosis code

Q: Is the diagnosis code set?

YES : 

Replace the automatic air conditioner 

control panel (A/C-ECU)

NO : 

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

P.00-5

.)

AC310614

AI

Connectors: C-01, C-04, C-106 <LHD>

Harness side

C-106

C-04

C-106

Harness side

C-04 (GR)

C-01

C-01

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-34

Code No. B1061,B1062: Potentiometer system for air outlet changeover damper <RHD>

COMMENTS ON TROUBLE SYMPTOM

This code is set when the mode selection 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 mode selection damper control 

motor and potentiometer

• Damaged the wiring harness or connectors

• Malfunction of the automatic air conditioner 

control panel (A/C-ECU)

DIAGNOSIS

Step 1. MUT-III data list

Check that the following service data display 
contents are normal. (Refer to 

P.55-183

.)

• Item 14: F.Air outlet c/o potentiometer

• Item 15: F.Air outlet c/o potentiometer (Target)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 2.

Step 2. Connector check: C-106 A/C-ECU 
connector and C-04 mode selection damper 
control motor and potentiometer connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the connector.

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

MODE SELECTION
DAMPER CONTROL
MOTOR AND
POTENTIOMETER

A/C-ECU

Mode Selection Damper Control Motor And Potentiometer Circuit

AC310632 AD

Connectors: C-04, C-106 <RHD>

Harness side

C-106

C-04

C-106

Harness side

C-04 (GR)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-35

Step 3. Check the wiring harness between C-106 
A/C-ECU connector (terminals 1, 21 and 14) and 
C-04 mode selection damper control motor and 
potentiometer connector (terminals 7, 3 and 5).

• 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 mode selection damper control 
motor and potentiometer.

Refer to 

P.55-208

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the mode selection damper control 
motor and potentiometer.

Step 5. MUT-III diagnosis code

Q: Is the diagnosis code set?

YES : 

Replace the automatic air conditioner 

control panel (A/C-ECU)

NO : 

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

P.00-5

.)

Code No. B1065: Motor drive system for air outlet switching damper

AC310632 AD

Connectors: C-04, C-106 <RHD>

Harness side

C-106

C-04

C-106

Harness side

C-04 (GR)

A/C-ECU

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

MODE SELECTION DAMPER CONTROL
MOTOR AND POTENTIOMETER

Mode Selection Damper Control Motor And Potentiometer Circuit

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-36

COMMENTS ON TROUBLE SYMPTOM

This code is set when the mode selection damper 
cannot be rotated to the preset opening angle.

POSSIBLE CAUSES

• Malfunction of the rear mode selection damper 

control motor and potentiometer

• Malfunction of the automatic air conditioner 

control panel (A/C-ECU)

• Damaged the wiring harness or connectors

DIAGNOSIS

Step 1. MUT-III actuator test

Check that the following actuator test can be 
executed normally.

• Item 20: Air outlet c/o dumper: FACE

• Item 21: Air outlet c/o dumper: Bi-Level

• Item 22: Air outlet c/o dumper: FOOT

• Item 23: Air outlet c/o dumper: DEF/FOOT

• Item 24: Air outlet c/o dumper: DEF

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 2.

Step 2. Connector check: C-105 A/C-ECU 
connector and C-04 rear mode selection damper 
control motor and potentiometer connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the connector.

AC310614

AJ

Connectors: C-04, C-105 <LHD>

Harness side

C-105

C-04

C-105

Harness side

C-04 (GR)

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AC310632 AE

Connectors: C-04, C-105 <RHD>

Harness side

C-105

C-04

C-105

Harness side

C-04 (GR)

31

32

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