Nissan Pathfinder (2009 year). Manual - part 191

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< BASIC INSPECTION >

[TRANSFER: ATX14B]

DIAGNOSIS AND REPAIR WORKFLOW

Does 4WD warning lamp turn ON?

YES

>> GO TO CHECK AT IDLE.

NO

>> GO TO 

DLN-111, "Diagnosis Procedure"

.

CHECK AT IDLE

1.

CHECK 4WD SHIFT INDICATOR LAMP

1.

Park vehicle on flat surface and engage the parking brake.

2.

Turn ignition switch to OFF position.

3.

Move A/T selector lever to P position.

4.

Set 4WD shift switch to 2WD position.

5.

Start engine.

Does 4WD shift indicator lamp turn ON?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK 4WD WARNING LAMP 

Check 4WD warning lamp state.

Is 4WD warning lamp turned ON?

YES

>> Perform the self-diagnosis. Refer to  

DLN-22, "CONSULT-III Function (ALL MODE AWD/4WD)"

.

NO

>> Refer to 

DLN-114, "Diagnosis Procedure"

.

3.

CHECK 4WD SHIFT INDICATOR AND 4LO INDICATOR OPERATION

1.

Brake pedal depressed.

2.

Move A/T selector lever to N position.

3.

Set 4WD shift switch to 2WD, AUTO, 4H, 4LO, 4H, AUTO and
2WD in order. (Stay at each switch position for at least 1 sec-
ond.)

Do 4WD shift indicator and 4LO indicator lamps change properly?
Does buzzer sound?

YES

>> GO TO CRUISE TEST.

NO

>> GO TO 

DLN-114, "Diagnosis Procedure"

.

CRUISE TEST

1.

CHECK INPUT SIGNAL

1.

Warm up engine to normal operating temperature.

2.

Park vehicle on flat surface.

3.

Move A/T selector lever to P position.

4.

Set 4WD shift switch to AUTO position.

5.

Start engine.

6.

Drive vehicle for at least 30 seconds at a speed higher than 20 km/h (12 MPH).

Is 4WD warning lamp turned ON?

On steady>>Perform the self-diagnosis. Refer to  

DLN-22, "CONSULT-III Function (ALL MODE AWD/4WD)"

.

WDIA0136E

2009 Pathfinder

DIAGNOSIS AND REPAIR WORKFLOW

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Flash rapidly>>Refer to 

DLN-119, "Diagnosis Procedure"

.

Flash slowly>>Refer to 

DLN-120, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

CHECK TIGHT CORNER BRAKING SYMPTOM (1)

1.

Set 4WD shift switch to AUTO position.

2.

Drive vehicle at speed lower than 20 km/h (12 MPH) with steering wheel fully turned.

Does tight corner braking symptom occur?

YES

>> GO TO 

DLN-121, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

CHECK TIGHT CORNER BRAKING SYMPTOM (2)

1.

Set 4WD shift switch to 4HI position.

2.

Drive vehicle at speed lower than 20 km/h (12 MPH) with steering wheel fully turned.

Does tight corner braking symptom occur?

YES

>> Inspection End.

NO

>> GO TO 

DLN-125, "Diagnosis Procedure"

.

2009 Pathfinder

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< FUNCTION DIAGNOSIS >

[TRANSFER: ATX14B]

4WD SYSTEM

FUNCTION DIAGNOSIS

4WD SYSTEM

System Diagram

INFOID:0000000003937186

COMPONENT DESCRIPTION

WDIA0164E

Components

Function

Transfer control unit

Controls transfer control device, control valves and shifts between 2WD/4WD and 4H/4LO.

Transfer control device

Integrates actuator motor and actuator position switch.

2-4WD shift solenoid valve

Controls oil pressure and allows shifting between 2WD and 4WD.

Clutch pressure solenoid valve

Controls oil pressure and distributes torque between front and rear tires.

Line pressure switch

Detects line pressure.

Clutch pressure switch

Detects clutch pressure.

Transfer fluid temperature sensor

Detects transfer fluid temperature.

Actuator motor

Moves shift rods when signaled by transfer control unit.

Actuator position switch

Detects actuator motor position.

Wait detection switch

Detects whether or not 4WD lock gear is locked.

4LO switch

Detects if transfer case is in 4LO.

ATP switch

Detects if transfer case is in neutral.

4WD shift switch

Allows driver to select from 2WD/4WD, 4H/4LO and AUTO.

4WD warning lamp

• Illuminates if malfunction is detected in 4WD system.
• Flashes (1 flash / 2 seconds) if large difference in diameter of front and rear tires.
• Flashes (2 flashes / 1 second) if high transfer fluid temperature is detected.

ATP warning lamp

Indicates that A/T parking mechanism does not operate when A/T selector lever is in P position 
because transfer case is in neutral.

4WD shift indicator lamp

Displays driving range selected by 4WD shift switch.

4LO indicator lamp

Displays 4LO range.

2009 Pathfinder

4WD SYSTEM

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System Description

INFOID:0000000003937187

CONTROL SYSTEM

ABS actuator and electric unit 
(control unit)

Transmits vehicle speed signal via CAN communication to transfer control unit.

TCM

Transmits the following signal via CAN communication to transfer control unit.
• Output shaft revolution signal
• A/T position indicator signal (PNP switch signal)

ECM

Transmits the following signals via CAN communication to transfer control unit.
• Engine speed signal
• Accelerator pedal position signal

Components

Function

2009 Pathfinder

DLN-14

< FUNCTION DIAGNOSIS >

[TRANSFER: ATX14B]

4WD SYSTEM

ALL-MODE 4WD Transfer Basic Control

SDIA3396E

2009 Pathfinder

4WD SYSTEM

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Hydraulic Control Circuits

TRANSFER CONTROL UNIT

• Transfer control unit controls transfer control device and it directs shifts from 4H-4LO and 2WD-4WD.
• Self-diagnosis can be done.

TRANSFER SHIFT HIGH AND LOW RELAYS

Transfer shift high and low relays apply power supply to transfer control device (actuator motor).

TRANSFER SHUT OFF RELAY

Transfer shut off relay applies power supply to transfer motor relay.

4WD SHIFT SWITCH AND INDICATOR LAMPS

4WD Shift Switch

Able to select from 2WD, AUTO, 4H or 4LO.

4WD Shift Indicator Lamp

• Displays driving conditions selected by 4WD shift switch with 2WD, AUTO and 4H indicators while engine is

running. (When 4WD warning lamp is turned on, all 4WD shift indicator lamps are turned off.)

• Turns ON for approximately 1 second when ignition switch is turned ON, for purpose of lamp check.

4LO Indicator Lamp

LDIA0055E

WDIA0163E

2009 Pathfinder

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< FUNCTION DIAGNOSIS >

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4WD SYSTEM

• Displays 4LO condition while engine is running. 4LO indicator lamp flashes if transfer gear does not shift

completely under 2WD, AUTO, 4H

⇔

4LO. (When 4WD warning lamp is turned on, 4LO indicator lamp is

turned off.)

• Turns ON for approximately 1 second when ignition switch is turned ON, for purpose of lamp check.

4WD WARNING LAMP

Turns on or flashes when there is a malfunction in 4WD system.
Also turns on when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately 1 sec-
ond after the engine starts if system is normal.

4WD Warning Lamp Indication

ATP WARNING LAMP

When the A/T selector lever is in P position, the vehicle may move if the transfer case is in neutral.  ATP warn-
ing lamp is turned on to indicate this condition to the driver.

LINE PRESSURE SWITCH

• With the transfer system design, control of the oil pressure provides the transmission of drive torque to the

front wheels. The main pressure to control the oil pressure is referred to as the line pressure.

• The line pressure switch determines whether or not adequate line pressure has built up under different oper-

ating conditions. 

• The line pressure switch closes when line pressure is produced.
• The line pressure switch senses line pressure abnormalities and turns the 4WD warning lamp ON.

CLUTCH PRESSURE SWITCH

• The clutch pressure switch determines whether or not adequate clutch pressure has built up under different

operating conditions. 

• The clutch pressure switch closes when clutch pressure is produced.
• The clutch pressure switch senses clutch pressure abnormalities and turns the 4WD warning lamp ON.

WAIT DETECTION SWITCH

• The wait detection switch operates when there is circulating torque produced in the propeller shaft (L

→

H) or

when there is a phase difference between 2-4 sleeve and clutch drum (H

→

L). After the release of the circu-

lating torque, the wait detection switch helps provide the 4WD lock gear (clutch drum) shifts. A difference
may occur between the operation of the 4WD shift switch and actual drive mode. At this point, the wait
detection switch senses an actual drive mode.

• The wait detection switch operates as follows.
- 4WD lock gear (clutch drum) locked: ON
- 4WD lock gear (clutch drum) released: OFF
• The wait detection switch senses an actual drive mode and the 4WD shift indicator lamp indicates the vehi-

cle drive mode. 

ATP SWITCH

ATP switch detects if transfer case is in neutral by the position of the L-H shift fork.
NOTE:
Transfer case may be in neutral when shifting between 4H-4LO.

NEUTRAL-4LO SWITCH

The neutral-4LO switch detects that transfer gear is in neutral or 4LO (or shifting from neutral to 4LO) condi-
tion by L-H shift fork position.

Condition

4WD warning lamp

System normal

OFF

Lamp check

Turns ON when ignition switch is turned ON.

Turns OFF after engine start.

4WD system malfunction

ON

During self-diagnosis

Flashes malfunction mode.

Large difference in diameter of front/
rear tires

Flashes slow (1 flash / 2 seconds)

(Continues to flash until the ignition switch is turned OFF)

High fluid temperature in transfer case

Flashes rapidly (2 flashes / 1 second)

(Continues to flash until fluid temperature returns to normal)

2009 Pathfinder

4WD SYSTEM

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< FUNCTION DIAGNOSIS >

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TRANSFER FLUID TEMPERATURE SENSOR

The transfer fluid temperature sensor detects the transfer fluid temperature and sends a signal to the transfer
control unit.

TRANSFER MOTOR

• The transfer motor drives the sub-oil pump to provide proper lubrication and oil pressure control when the

vehicle is at standstill, during low-speed operations or is being driven in reverse.

• The main oil pump is operated by the driving force of the mainshaft. In other words, sufficient oil pressure

buildup does not occur when the vehicle is at standstill or during low-speed operations. While the vehicle is
being driven in reverse, the main oil pump rotates in the reverse direction. Therefore the main oil pump does
not discharge oil pressure. During any of the above vehicle operations, the transfer motor drives the sub-oil
pump to compensate for insufficient oil pressure.

• The transfer motor operates as follows:
- The motor relay turns OFF in the 2WD mode.
- The motor relay operates as described in the table below in modes other than the 2WD mode.
• 4WD shift switch, PNP switch, Neutral-4LO switch, vehicle speed sensor and throttle position sensor are

used in conjunction with the transfer motor.

Transfer Motor Relay Operation

*: After 2.5 seconds have elapsed.

CLUTCH PRESSURE SOLENOID VALVE

The clutch pressure solenoid valve distributes front and rear torque in AUTO mode.

2-4WD SHIFT SOLENOID VALVE

The 2-4WD shift solenoid valve operates to apply oil pressure to the wet-multiplate clutch, depending on the
drive mode. The driving force is transmitted to the front wheels through the clutch so the vehicle is set in the
4WD mode. Setting the vehicle in the 2WD mode requires no pressure buildup. In other words, pressure force
applied to the wet-multiplate clutch becomes zero. 

TRANSFER CONTROL DEVICE

Integrates actuator motor and actuator position switch.

4WD shift switch

A/T selector lever position

Vehicle speed

(VSS)

Accelerator pedal position

Motor relay drive 

command

2WD

—

—

—

OFF

4H (LOCK) and 4LO

N position

0

—

 ON

P position

0

0 - 0.07/8

OFF*

0.07/8 - 1/8

 HOLD

1/8 - MAX

 ON

Other than R position

0 < VSS 

≤

 50 km/h (31 MPH)

—

 ON

50 km/h (31 MPH) < VSS < 55 

km/h (34 MPH)

 HOLD

55 km/h (34 MPH) 

≤

 VSS

OFF

R position

—

—

 ON

R position

—

—

 ON

AUTO

P or N position

0

0 - 0.07/8

OFF*

0.07/8 - 1/8

 HOLD

1/8 - MAX

 ON

0 < VSS 

≤

 50 km/h (31 MPH)

—

 ON

50 km/h (31 MPH) < VSS < 55 

km/h (34 MPH)

 HOLD

55 km/h (34 MPH) 

≤

 VSS

OFF

Other than R, P and N posi-
tion

0 < VSS 

≤

 50 km/h (31 MPH)

—

 ON

50 km/h (31 MPH) < VSS < 55 

km/h (34 MPH)

 HOLD

55 km/h (34 MPH) 

≤

 VSS

OFF

2009 Pathfinder