4WD SYSTEM : System Description

WARNING: This page is about a different variant/trim than selected.

In AUTO mode, distribution of traction force is controlled from 2WD status (0:100) to 4WD status (50:50) according to signal from each sensor and switch.
In accordance with fail-safe function, when system is malfunctioning, 4WD warning lamp on combination meter turns ON and 4WD control stops. For fail-safe function, refer to "4WD SYSTEM : FAIL-SAFE ".
When a high load status continues for transfer assembly (transfer control actuator or transfer fluid), 4WD control temporarily becomes 4H or 2WD status, according to protection function.
NOTE: 4WD system is not malfunctioning.

SYSTEM DIAGRAM

Fig 1: 4WD - System Diagram

Courtesy of NISSAN MOTOR CO., U.S.A.

INPUT/OUTPUT SIGNAL

It transmits/receives each signal from the following transfer control unit via CAN communication line.

COMPONENTS DESCRIPTION

Component parts	Control signal
ABS actuator and electric unit (control unit)	Transmits the following signals via CAN communication line to transfer control unit. Vehicle speed signal (ABS) Stop lamp switch signal (brake signal) ABS operation signal VDC operation signal TCS operation signal
ECM	Transmits the following signals via CAN communication line to transfer control unit. Accelerator pedal position signal Engine speed signal Engine torque signal
TCM	Transmits the following signals via CAN communication line to transfer control unit. Shift position signal Gear position signal Output shaft revolution signal
Steering angle sensor	Transmits the following signals via CAN communication line to transfer control unit. Steering angle sensor signal
Combination meter	Receives the following signals via CAN communication line from transfer control unit. 4WD warning lamp signal ATP warning lamp signal 4WD mode indicator signal

4WD SHIFT SWITCH AND 4WD SHIFT INDICATOR LAMP

4WD SHIFT SWITCH AND 4WD SHIFT INDICATOR LAMP SPECIFICATION

4WD shift switch

4WD shift indicator lamp (in Information display)

4WD shift procedure

AUTO

Courtesy of NISSAN MOTOR CO., U.S.A.

Courtesy of NISSAN MOTOR CO., U.S.A.

Start the engine.
Turn the 4WD shift switch.
NOTE: Mode can be switched between AUTO<=>4H while driving straight.

Courtesy of NISSAN MOTOR CO., U.S.A.

Courtesy of NISSAN MOTOR CO., U.S.A.

Courtesy of NISSAN MOTOR CO., U.S.A.

4WD status: 4H<=>4L

Courtesy of NISSAN MOTOR CO., U.S.A.

(Blinking)⁽¹⁾⁽²⁾

Start the engine.
Never drive the vehicle.
Shift A/T shift selector to N position.
Press and rotate 4WD shift switch while depressing brake pedal.
CAUTION: 4WD mode does not switch when 4WD shift switch is operated while the vehicle is running or A/T shift selector is shifted to any position other than neutral.

Courtesy of NISSAN MOTOR CO., U.S.A.

Courtesy of NISSAN MOTOR CO., U.S.A.

⁽¹⁾	Blinking 2 times/1 second

⁽²⁾	"4HI" and "4LO" blink alternately.

CONDITION FOR TURN ON THE WARNING LAMP

4WD Warning Lamp

Turns ON when there is a malfunction in 4WD system. 4WD warning lamp indicates the vehicle is in fail-safe mode.
Also turns ON when ignition switch is turned ON, for the purpose of lamp check. Turns OFF approximately for 1 second after the engine starts if system is normal.

4WD SHIFT INDICATOR LAMP CONDITION

Condition	4WD warning lamp
Lamp check	Turns ON when ignition switch is turned ON. Turns OFF approx. 1 second after the engine start.
4WD system malfunction	ON
Protection function is activated due to heavy load to transfer assembly. (4WD system is not malfunctioning.)	Quick blinking: 2 times/second (Blinking in approx. 1 minute and then turning OFF)
Large difference in diameter of front/rear tires	Slow blinking: 1 time/2 seconds (Continuing to blink until turning ignition switch OFF)
Other than above (system normal)	OFF

ATP Warning Lamp

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

CONDITION FOR OPERATE WARNING BUZZER

For preventing an incorrect operation during 4H<=>4L switching, warning buzzer sounds from inside of transfer control unit and warns the driver, when certain conditions are satisfied.

WARNING BUZZER CONDITION

Condition			Warning buzzer
4WD shift status	A/T shift selector	Engine speed	Warning buzzer
4H<=>4L	N range	350 - 1.600 rpm	OFF
	N range	Under 350 rpm or over 1.600 rpm	ON
	Except N range	Always	ON