Nissan Pathfinder: Exterior - System Description

Nissan Pathfinder (R53) 2022-2025 Service Manual / Body Exterior, Doors, Roof & Vehicle Security :: Exterior / System Description

Component Parts. Active Grille Shutter System
System. Active Grille Shutter System

Component Parts. Active Grille Shutter System Nissan Pathfinder 5th Gen

Component Parts Location

No.	Component	Function
1.	Active grille shutter	Refer to Active grille shutter.
2.	ECM (Engine Control Module)	Refer to ECM.
3.	IPDM E/R (Intelligent Power Distribution Module Engine Room)	Refer to Component Parts Location.

For the engine related component parts, refer to Component Parts Location.

Active grille shutter

Active grille shutter is located at front bumper lower opening, and according to the signal from ECM it operates actuator to perform open/close movement of flap to control the amount of air flow taken into engine compartment.

System. Active Grille Shutter System Nissan Pathfinder 5th Gen

System Description

SYSTEM DIAGRAM

INPUT/OUTPUT SIGNAL

ECM transmits/receives each signal from the following components:

Component parts	Function
Active grille shutter	Transmits the following signals to the ECM. Active grille shutter position Active grille shutter calibration signal
Active grille shutter	Receives the following signals from the ECM. Active grille shutter position Active grille shutter calibration status Active grille shutter diagnosis signal
Engine oil temperature sensor	Transmits engine oil temperature signal to the ECM.
Engine coolant temperature sensor	Transmits engine coolant temperature signal to the ECM.
Refrigerant pressure sensor	Transmits refrigerant pressure signal to the ECM.
Refrigerant pressure sensor	Transmits refrigerant pressure signal to the ECM.
TCM	Transmits the AT fluid temperature signal via CAN communication to ECM control unit.
Combination meter	Transmits the Nissan Pathfinder vehicle speed signal via CAN communication to ECM.

System Description

While driving, the active grille shutter system closes shutter to reduce air flow to engine compartment for the purpose of reducing aerodynamic drag, and as a result, improves the Nissan Pathfinder vehicle's fuel efficiency.

ECM controls active grille shutter system by detecting vehicle status through respective modules and sensors.

Active grille shutter actuator is equipped with self-diagnosis function. When a malfunction is detected, a signal is transmitted to the ECM and the ECM records the active grille shutter malfunction.

BASIC MOVEMENTS

S1: 30 km/h (19 MPH)
S2: Approx. 30 - 140 km/h (19 - 88 MPH)
*1: Shutter initial position learning
*2: Judgment of high Nissan Pathfinder vehicle speed
*3: Judgment of low vehicle speed

DESCRIPTION OF MOVEMENTS

Active grille shutter is fully open when the vehicle stops or the ignition switch is turned OFF.

ECM operates the shutter to close position in order to perform shutter's initial position learning whenever the ignition switch is turned OFF → ON and the engine is started. At the end of initial position learning ECM operates shutter to open position.

While driving, after the initial position learning ends, ECM operates the active grille shutter to close position when the operational conditions of active grille shutter are met.

While driving at high speed, ECM operates the shutter to open position when the vehicle reaches the specified speed in order to prevent the shutter from shutting up due to wind resistance.

When the vehicle speed is reduced below the specified speed ECM operates active grille shutter to open position.

NOTE:

When any one of the conditions for opening the active grille shutter is satisfied, ECM performs active grille shutter initial position learning even when the Nissan Pathfinder vehicle speed is less than 30 km/h.

ECM may perform active grille shutter initial position learning according to other diagnosis conditions.

ACTIVE GRILLE SHUTTER OPERATIONAL CONDITIONS

ECM operates active grille shutter to close position when all of the following conditions are met:

Item	Status
Active grille shutter initial position learning	Complete
Nissan Pathfinder Vehicle speed	Approx. 30 - 140 km/h (19 - 88 MPH)
Engine coolant temperature	Approx. less than 95°C (203°F)
Engine oil temperature	Approx. less than 140°C (284°F)
AT fluid temperature	Approx. less than 135°C (275°F)
Cooling fan	OFF
Refrigerant pressure	0.98 MPa (10.0 kg/cm², 142.1 psi) or less
Malfunction of engine coolant temperature sensor system	Not detected
Malfunction of engine oil temperature sensor system	Not detected
Malfunction of Nissan Pathfinder vehicle speed sensor system	Not detected
Malfunction of CAN communication system	Not detected

ECM operates active grille shutter to open position when one of the following conditions is met:

Item	Status
Nissan Pathfinder Vehicle speed	22 km/h (14 MPH) or less 140 km/h (88 MPH) or more
Engine coolant temperature	Approx. 95°C (203°F) or more
Engine oil temperature	Approx. 140°C (284°F) or more
AT fluid temperature	Approx. 135°C (275°F) or more
Cooling fan	ON
Refrigerant pressure	1.18 MPa (12.04 kg/cm², 171.1 psi) or more
Malfunction of engine coolant temperature sensor system	Detected
Malfunction of engine oil temperature sensor system	Detected
Malfunction of Nissan Pathfinder vehicle speed sensor system	Detected
Malfunction of CAN communication system	Detected