Nissan Pathfinder (2006 year). Manual - part 337

TROUBLE DIAGNOSIS

MTC-49

C

D

E

F

G

H

I

K

L

M

A

B

MTC

2006 Pathfinder

Air Mix Door Motor Circuit

EJS004RO

SYMPTOM:

●

Discharge air temperature does not change.

●

Air mix door motor does not operate.

INSPECTION FLOW

*1

MTC-40, "Operational Check"

 *2

MTC-51, "DIAGNOSTIC PROCE-
DURE FOR AIR MIX DOOR 
MOTOR (FRONT)"

*3

MTC-82, "FRONT AIR CONTROL"

WJIA1500E

MTC-50

TROUBLE DIAGNOSIS

2006 Pathfinder

SYSTEM DESCRIPTION
Component Parts

Air mix door control system components are:

●

Front air control

●

Air mix door motor (front)

●

PBR (built into air mix door motor)

●

Intake sensor

System Operation

The front air control receives data from the temperature selected by the driver. The front air control then
applies a voltage to one circuit of the air mix door motor, while ground is applied to the other circuit, causing
the air mix door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to
it, and which one has ground applied to it. The front air control monitors the air mix door positions by measur-
ing the voltage signal on the PBR circuits of each door.

Air Mix Door Control Specification

COMPONENT DESCRIPTION
Air Mix Door Motors

The air mix door motor is attached to the front heater and cooling
unit assembly. This motor rotates so that the air mix door is opened
or closed to a position set by the front air control. Motor rotation is
then conveyed through a shaft and the air mix door position is then
fed back to the front air control by the PBR built into the air mix door
motor.

WJIA1316E

WJIA0435E

WJIA1485E

TROUBLE DIAGNOSIS

MTC-51

C

D

E

F

G

H

I

K

L

M

A

B

MTC

2006 Pathfinder

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)

1. 

CHECK POWER SUPPLY CIRCUITS FOR AIR MIX DOOR MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and air mix door motor
(front) connector.

3.

Check continuity between front air control harness connector
M49 terminal 2 and 3 and air mix door motor (front) harness
connector M147 terminal 6 and 5.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace harness as necessary.

2. 

CHECK PBR REFERENCE SIGNAL VOLTAGE

1.

Reconnect the front air control connector.

2.

Turn ignition switch ON.

3.

Check voltage between air mix door motor (front) harness con-
nector M147 terminal 1 and ground.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR MOTOR (FRONT) AND 

FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between air mix door motor (front) harness
connector M147 (B) terminal 1 and front air control harness con-
nector M49 (A) terminal 23.

OK or NG

OK

>> Replace front air control. Refer to 

ATC-127, "FRONT AIR CONTROL"

 .

NG

>> Repair or replace harness as necessary.

2 - 6

: Continuity should exist.

3 - 5

: Continuity should exist.

WJIA1318E

 1 - Ground

: Approx. 5V

WJIA1319E

A

B

Connector

Terminal Connector

Terminal 

Continuity

Front air control: 

M49

23 

Air mix door motor 

(front): M143

1

Yes

WJIA1656E

MTC-52

TROUBLE DIAGNOSIS

2006 Pathfinder

4. 

CHECK PBR GROUND REFERENCE CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect the front air control connector.

3.

Check continuity between air mix door motor (front) harness
connector M147 terminal 3 and front air control harness connec-
tor M49 terminal 26.

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace harness as necessary.

5. 

CHECK PBR FEEDBACK SIGNAL

1.

Reconnect the front air control connector and air mix door motor
(front) connector.

2.

Turn ignition switch ON.

3.

Check voltage between front air control harness connector M49
terminal 22 and ground.

4.

Rotate temperature control dial through complete range.

OK or NG

OK

>> Replace front air control. Refer to 

ATC-127, "FRONT

AIR CONTROL"

 .

NG

>> GO TO 6.

6. 

CHECK PBR FEEDBACK CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the air mix door motor (front) connector and front air
control connector.

3.

Check continuity between air mix door motor (front) harness
connector M147 terminal 2 and front air control harness connec-
tor M49 terminal 22.

OK or NG

OK

>> Replace air mix door motor (front). Refer to 

MTC-92,

"AIR MIX DOOR MOTOR"

 .

NG

>> Repair or replace harness as necessary.

3 - 26

: Continuity should exist.

WJIA1320E

22 - Ground

: Approx. 0V - 5V

WJIA1096E

2 - 22

: Continuity should exist.

WJIA1321E

TROUBLE DIAGNOSIS

MTC-53

C

D

E

F

G

H

I

K

L

M

A

B

MTC

2006 Pathfinder

Intake Door Motor Circuit

EJS004RP

SYMPTOM:

●

Intake door does not change.

●

Intake door motor does not operate normally.

INSPECTION FLOW

*1

ATC-53, "Operational Check (Front)"

*2

MTC-82, "FRONT AIR CONTROL"

.

WJIA1477E

MTC-54

TROUBLE DIAGNOSIS

2006 Pathfinder

SYSTEM DESCRIPTION
Component Parts

Intake door control system components are:

●

Front air control

●

Intake door motor

●

Intake sensor

System Operation

The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.

COMPONENT DESCRIPTION
Intake door motor

The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.

WJIA1478E

WJIA1486E

TROUBLE DIAGNOSIS

MTC-55

C

D

E

F

G

H

I

K

L

M

A

B

MTC

2006 Pathfinder

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

1. 

CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE

1.

Turn ignition switch OFF.

2.

Disconnect intake door motor connector.

3.

Turn ignition switch ON.

4.

Rotate the temperature control dial counterclockwise.

5.

Check voltage between intake door motor harness connector
M58 terminal 6 and ground.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector.

3.

Check continuity between front air control harness connector
M49 terminal 5 and intake door motor harness connector M58
terminal 6.

OK or NG

OK

>> Replace front air control connector. Refer to 

MTC-82,

"CONTROL UNIT"

 .

NG

>> Repair or replace harness as necessary.

3. 

CHECK INTAKE DOOR MOTOR CIRCUIT VOLTAGE

1.

Rotate the temperature control dial clockwise.

2.

Check voltage between intake door motor harness connector
M58 terminal 1 and ground.

OK or NG

OK

>> Replace intake door motor. Refer to 

ATC-143, "INTAKE

DOOR MOTOR"

 .

NG

>> GO TO 4.

6 - Ground

: Battery voltage

WJIA1324E

5 - 6

: Continuity should exist.

WJIA1468E

1 - Ground

:Battery voltage

WJIA1326E

MTC-56

TROUBLE DIAGNOSIS

2006 Pathfinder

4. 

CHECK INTAKE DOOR MOTOR CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector.

3.

Check continuity between front air control harness connector
M49 (A) terminal 4 and intake door motor harness connector
M58 (B) terminal 1.

OK or NG

OK

>> Replace front air control connector. Refer to 

MTC-82, "CONTROL UNIT"

 .

NG

>> Repair or replace harness as necessary.

A

B

Connector

Terminal Connector

Terminal 

Continuity

Front air control: 

M49

4 

Intake door motor: 

M58

1

Yes

WJIA1684E