Mitsubishi Grandis. Manual — part 295

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-65

Step 5. Check the wiring harness between C-10
outside/inside air selection damper control motor
connector terminal No.1 and the ignition switch
(IG2).

NOTE:

Prior to the wiring harness inspection, check joint
connector C-31 and junction block connectors C-205
and C-202, and repair if necessary.

• Check the motor power supply line for open

circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction

P.00-5

).

NO :

Repair the wiring harness.

Step 6. Check the outside/inside air selection
damper control motor

Refer to

P.55-208

.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Replace the outside/inside air selection
damper control motor.

Step 7. Connector check: C-105 A/C-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the connector.

AC310615

AH

Harness side

Connector: C-10 <LHD>

AC310613

AP

Connector: C-31 <LHD>

AC310624

Connectors: C-202, C-205 <LHD>

AF

Junction block (Front view)

C-205

C-202

C-205

Harness side

C-202

Harness side

AC310613

AC

Connector: C-105 <LHD>

Harness side

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-66

Step 8. Check the wiring harness between C-105
A/C-ECU connector (terminals 37 and 38) and
C-10 outside/inside air selection damper control
motor connector (terminals 2 and 3).

• Check the motor activating lines for open or short

circuit.

Q: Is the check result normal?

YES :

Replace the automatic air conditioner

control panel (A/C-ECU).

NO :

Repair the wiring harness.

AC310615

AH

Harness side

Connector: C-10 <LHD>

AC310613

AC

Connector: C-105 <LHD>

Harness side

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-67

INSPECTION PROCEDURE 6: The inside/outside air changeover is impossible. <RHD>

COMMENTS ON TROUBLE SYMPTOM

When inside air cannot be changed to outside air
vice versa even if its changeover switch is on, the
outside/inside air selection damper control motor
system may be defective.

POSSIBLE CAUSES

• Malfunction of the outside/inside air selection

damper control motor

• Damaged the wiring harness or connectors

• Malfunction of the automatic air conditioner

control panel (A/C-ECU)

DIAGNOSIS

STEP 1. Check the operation of the heater control
panel

Check that the A/C switch, rear window defogger
switch and air volume control dial can operate.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

INSPECTION PROCEDURE 27: Refer to
A/C-ECU power supply system
<RHD>

P.55-178

.

Step 2. MUT-III actuator test

Carry out the actuator test.

• Item 30: In/out changeover dumper: Recirc

• Item 31: In/out changeover dumper: Fresh

Q: Does the blower motor work normally?

YES :

Replace the automatic air conditioner

control panel (A/C-ECU)

NO :

Go to Step 3.

A/C-ECU

IGNITION
SWITCH (IG2)

OUTSIDE/INSIDE AIR
SELECTION DAMPER
CONTROL MOTOR

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

Outside/Inside Air Selection Damper Control Motor Circuit

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-68

Step 3. Connector check: C-10 outside/inside air
selection damper control motor connector

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the connector.

Step 4. Voltage measurement at C-10
outside/inside air selection damper control motor
connector.

(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between terminal 1 and

body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Go to Step 5.

AC310628AI

Harness side

Connector: C-10 <RHD>

AC310628AI

Harness side

Connector: C-10 <RHD>

AC310507AR

Connector C-10
(Harness side)