Nissan Pathfinder (2008 year). Manual - part 179

DLN-16

< FUNCTION DIAGNOSIS >

[TRANSFER: ATX14B]

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)

4WD SYSTEM

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< FUNCTION DIAGNOSIS >

[TRANSFER: ATX14B]

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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

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< FUNCTION DIAGNOSIS >

[TRANSFER: ATX14B]

4WD SYSTEM

Actuator Motor

Moves shift rods when signaled by transfer control unit.

Actuator Position Switch

Detects actuator motor position and then sends signal to transfer control unit.

Component Parts Location

INFOID:0000000001728335

WDIA0124E

4WD SYSTEM

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CAN Communication

INFOID:0000000001728336

Refer to 

LAN-10, "Self-Diagnosis"

.

DLN-20

< FUNCTION DIAGNOSIS >

[TRANSFER: ATX14B]

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

CONSULT-III Function (ALL MODE AWD/4WD)

INFOID:0000000001728337

FUNCTION

CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.

SELF-DIAG RESULT MODE

Operation Procedure

1.

Connect CONSULT-III.

2.

With engine at idle, touch SELF-DIAG RESULTS.
Display shows malfunction experienced since the last erasing operation.

NOTE:
The details for TIME are as follows:
• 0: Error currently detected with transfer control unit.
• Except for 0: Error detected in the past and memorized with transfer control unit.

Detects frequency of driving after DTC occurs (frequency of turning ignition switch ON/OFF).

How to Erase Self-diagnostic Results

1.

Perform applicable inspection of malfunctioning item and then repair or replace.

2.

Start engine and select SELF-DIAG RESULTS mode for ALL MODE AWD/4WD with CONSULT-III.

3.

Touch ERASE on CONSULT-III screen to erase DTC memory.

CAUTION:

If memory cannot be erased, perform applicable diagnosis.

 SELF-DIAGNOSTIC PROCEDURE (WITHOUT CONSULT-III)

Description

If the engine starts when there is a malfunction in the 4WD system, the 4WD warning lamp turns ON or flickers
in the combination meter. When the system functions properly, the warning lamp turns ON when the ignition
switch is turned to ON, and it turns OFF after engine starts. To locate the cause of a malfunction, start the self-
diagnosis function. The 4WD warning lamp in the combination meter will indicate the malfunction area by
flashing according to the self-diagnostic results.  Refer to 

DLN-101, "DTC Index"

.

Diagnostic Procedure

1.

Warn up engine. 

2.

Move A/T selector lever to P position.

3.

Turn 4WD shift switch to 2WD position.

4.

Turn ignition switch ON and OFF at least twice, and then turn ignition switch OFF.

5.

Turn 4WD shift switch to AUTO position.

6.

Turn ignition switch ON. (Do not start engine.)

7.

4WD warning lamp ON.

8.

Move A/T selector lever to R position.

9.

Turn 4WD shift switch to 2WD, AUTO and 2WD in order.

10. Move A/T selector lever to D position.
11. Turn 4WD shift switch to 4H, AUTO and 4H in order.

ALL MODE AWD/4WD diagnostic mode

Description

SELF-DIAG RESULTS

Displays transfer control unit self-diagnosis results.

DATA MONITOR

Displays transfer control unit input/output data in real time.

WORK SUPPORT

Supports inspections and adjustments.  Commands are transmitted to the transfer control 
unit for setting the status suitable for required operation, input/output signals are received 
from the transfer control unit and received data is displayed.

CAN DIAG SUPPORT MNTR

The results of transmit/receive diagnosis of CAN communication can be read.

ECU PART NUMBER

Transfer control unit part number can be read.

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

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< FUNCTION DIAGNOSIS >

[TRANSFER: ATX14B]

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12. Move A/T selector lever to N position.

13. Turn 4WD shift switch to AUTO position.
14. Move A/T selector lever to P position.

15. Read the flickering of 4WD warning lamp.

Self-diagnosis example

ERASE SELF-DIAGNOSIS

• In order to make it easier to find the cause of hard-to-duplicate malfunctions, malfunction information is

stored into the control unit as necessary during use by the user. This memory is not erased no matter how
many times the ignition switch is turned ON and OFF.

• However, this information is erased by turning ignition switch OFF after performing self-diagnostics or by

erasing the memory using the CONSULT-III.

DATA MONITOR MODE

Operation Procedure

1.

Connect CONSULT-III.

2.

Touch DATA MONITOR.

3.

Select from SELECT MONITOR ITEM, screen of data monitor mode is displayed.
NOTE:
When malfunction is detected, CONSULT-III performs REAL-TIME DIAGNOSIS.
Also, any malfunction detected while in this mode will be displayed at real time.

Display Item List

×

: Standard

–: Not applicable

PDIA0227E

Monitored item (Unit)

Monitor item selection

Remarks

ECU INPUT 

SIGNALS

MAIN

SIGNALS

SELEC-

TION FROM 

MENU

VHCL/S SEN·FR [km/h] or [mph]

×

–

×

Wheel speed calculated by ABS actuator and 
electric unit (control unit).
Signal input with CAN communication line.

VHCL/S SEN·RR [km/h] or [mph]

×

–

×

Wheel speed calculated by TCM.
Signal input with CAN communication line.

ENGINE SPEED [rpm]

×

–

×

Engine speed calculated by ECM.
Signal input with CAN communication line.

THRTL POS SEN [V]

×

–

×

Accelerator pedal position (APP) sensor sig-
nal voltage is displayed.
Signal input with CAN communication line.

FLUID TEMP SE [V]

×

–

×

Transfer fluid temperature sensor signal volt-
age is displayed.

BATTERY VOLT [V]

×

–

×

Power supply voltage for transfer control unit.

2WD SWITCH [ON/OFF]

×

–

×

4WD shift switch status is displayed.

AUTO SWITCH [ON/OFF]

×

–

×

4WD shift switch status is displayed.

LOCK SWITCH [ON/OFF]

×

–

×

4WD shift switch status is displayed.
(LOCK means 4H of 4WD shift switch.)

DLN-22

< FUNCTION DIAGNOSIS >

[TRANSFER: ATX14B]

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

4L SW [ON/OFF]

×

–

×

4WD shift switch status is displayed.
(4L means 4LO of 4WD shift switch.)

N POSI SW TF [ON/OFF]

×

–

×

Neutral-4LO switch signal status is displayed.

ATP SWITCH [ON/OFF]

×

–

×

ATP switch signal status is displayed.

WAIT DETCT SW [ON/OFF]

×

–

×

Wait detection switch status is displayed.

LINE PRES SW [ON/OFF]

×

–

×

Line pressure switch status is displayed.

CL PRES SW [ON / OFF]

×

–

×

Clutch pressure switch status is displayed.

N POSI SW AT [ON/OFF]

×

–

×

N position signal of A/T PNP switch status is 
displayed.
Signal input with CAN communication line.

R POSI SW AT [ON/OFF]

×

–

×

R position signal of A/T PNP switch status is 
displayed.
Signal input with CAN communication line.

P POSI SW AT [ON/OFF]

×

–

×

P position signal of A/T PNP switch status is 
displayed.
Signal input with CAN communication line.

ABS OPER SW [ON/OFF]

×

–

×

ABS operation signal status is displayed.
Signal input with CAN communication line.

VDC OPER SW [ON/OFF]

×

–

×

VDC operation signal status is displayed.
Signal input with CAN communication line.

TCS OPER SW [ON/OFF]

×

–

×

TCS operation signal status is displayed.
Signal input with CAN communication line.

THROTTLE POSI [0.0/8]

 –

×

×

Thottle position status is displayed.
Signal input with CAN communication line.

4WD MODE [AUTO/LOCK/2WD/4L]

 –

×

×

Control status of 4WD recognized by transfer 
control unit. (AUTO, 4H, 2WD or 4LO)

VHCL/S COMP [km/h] or [mph]

 –

×

×

Vehicle speed recognized by transfer control 
unit.

COMP CL TORQ [kgm]

 –

×

×

Calculated torque recognized by transfer con-
trol unit.

DUTY SOLENOID [%]

 –

×

×

Control value of clutch pressure solenoid.

2-4WD SOL [ON/OFF]

 –

×

×

Output condition to 2-4WD solenoid.

2-4WD SOL MON [ON/OFF]

 –

 –

×

Check signal for transfer control unit signal 
output.

MOTOR RELAY [ON/OFF]

 –

×

×

Transfer motor relay signal status is dis-
played.

MOTOR RELAY MON [ON/OFF]

 –

 –

×

Check signal for transfer control unit signal 
output.

4WD FAIL LAMP [ON/OFF]

 –

×

×

Control status of 4WD warning lamp is dis-
played.

2WD IND [ON/OFF]

–

–

×

Control status of 4WD shift indicator lamp 
(2WD indicator lamp) is displayed.

AUTO IND [ON/OFF]

–

–

×

Control status of 4WD shift indicator lamp 
(2WD and AUTO indicator lamp) is displayed.

LOCK IND [ON/OFF]

–

–

×

Control status of 4WD shift indicator lamp 
(2WD, AUTO and Lock indicator) is displayed.

4L IND [ON/OFF]

–

–

×

Control status of 4LO indicator lamp is dis-
played.

Monitored item (Unit)

Monitor item selection

Remarks

ECU INPUT 

SIGNALS

MAIN

SIGNALS

SELEC-

TION FROM 

MENU

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

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WORK SUPPORT

When there is no malfunction with transfer and 4WD system, the following symptoms in AUTO mode may be
claimed by a customer: vibration when accelerating on a low 

µ

 road (snow-covered or icy road) or a slight

shock is felt at a few hertz as if it were being pushed lightly from behind.
It is possible to deal with these symptoms by changing the CLUTCH FORCE RELEASE LIMIT VALUE. How-
ever, be careful when changing the value because it may adversely affect driving performance.

Operation Procedure

1.

Connect CONSULT-III.

2.

Touch WORK SUPPORT.

3.

Select from CLUTCH/F RLS LIM ADJ, screen of data monitor mode is displayed.

Clutch Force Release Limit Adjustment

1.

Initial CLUTCH FORCE RELEASE LIMIT value 0.3 kgm appears under CONDITION SETTING on CON-
SULT-III display.

2.

Touch 1.2 on the display.

3.

Display changes to NOW ADJUSTING in a short time.

4.

When clutch force release limit value is set to 1.2 kgm, current value 0.3 kgm shown on display will be
replaced by 1.2 kgm and ADJUSTMENT COMPLETE will appear at the same time. Clutch force release
limit value setting is now complete.

ATP IND [ON/OFF]

–

–

×

Control status of ATP warning lamp is dis-
played.

SHIFT POS SW1 [ON/OFF]

×

–

×

Actuator position switch 1 (Low) signal status 
is displayed.

SHIFT POS SW2 [ON/OFF]

×

–

×

Actuator position switch 2 (high) signal status 
is displayed.

SHIFT ACT1 [ON/OFF]

–

×

×

Output condition to actuator motor (clockwise)

SHIFT AC MON1 [ON/OFF]

×

–

×

Check signal for transfer control unit signal 
output

SHIFT ACT2 [ON/OFF]

–

×

×

Output condition to actuator motor (counter-
clockwise)

SHIFT AC MON2 [ON/OFF]

×

–

×

Check signal for transfer control unit signal 
output

T/F F SPEED [km/h] or [mph]

×

–

×

Displayed, but do not use.

A/T R SPEED [km/h] or [mph]

×

–

×

Output shaft revolution signal (Revolution 
sensor) calculated by TCM.
Signal input with CAN communication line.

AT GEAR POSI [1/2/3/4/5]

×

–

×

A/T actual gear position is displayed.

Monitored item (Unit)

Monitor item selection

Remarks

ECU INPUT 

SIGNALS

MAIN

SIGNALS

SELEC-

TION FROM 

MENU

1.2 kg-m

: Tight corner braking symptom is alleviated. 
However, vibration may occur when acceler-
ating on a low 

µ

 road (icy road, etc.).

0.3 kg-m

: Initial set value.

0.2 kg-m

: Do not set to this value because the tight 
corner braking symptom will get worse.