Nissan X-Trail 32. Instruction — part 831

COMPONENT PARTS

EC-453

< SYSTEM DESCRIPTION >

[QR25DE]

Refrigerant Pressure Sensor

INFOID:0000000010986224

The refrigerant pressure sensor is installed at the condenser of the air conditioner system. The sensor uses an
electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent
to ECM, and ECM controls cooling fan system.

Stop Lamp Switch & Brake Pedal Position Switch

INFOID:0000000010986225

Stop lamp switch and brake pedal position switch are installed to brake pedal bracket.
ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).

ASCD Steering Switch

INFOID:0000000010986226

ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation
of switch, and determines which button is operated.

Information Display

INFOID:0000000010986227

The operation mode of the ASCD is indicated on the information display in the combination meter.
ECM transmits the status signal to the combination meter via CAN communication according to ASCD opera-
tion.

PBIB2657E

Brake pedal

Brake pedal position switch

Stop lamp switch

Released

OFF

Depressed

OFF

EC-454

< SYSTEM DESCRIPTION >

[QR25DE]

STRUCTURE AND OPERATION

STRUCTURE AND OPERATION

Positive Crankcase Ventilation

INFOID:0000000010986228

This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold.
During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV
valve.
Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes
through the hose connecting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.
The flow goes through the hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all condi-
tions.

PBIB0492E

PBIB1588E