Nissan X-Trail 32. Manual - part 835

SYSTEM

EC-469

< SYSTEM DESCRIPTION >

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EXHAUST VALVE TIMING CONTROL : System Description

INFOID:0000000010986236

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the exhaust
valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine oil tem-
perature. Then, the ECM sends ON/OFF pulse duty signals to the exhaust valve timing (EVT) control solenoid
valve depending on driving status. This makes it possible to control the shut/open timing of the exhaust valve
to increase engine torque and output in a range of high engine speed.

INTAKE MANIFOLD RUNNER CONTROL

JPBIA4761GB

JPBIA5972GB

EC-470

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SYSTEM

INTAKE MANIFOLD RUNNER CONTROL : System Description

INFOID:0000000010986237

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

Intake manifold runner control valve has a valve portion in the intake passage of each cylinder.
While idling and during low engine coolant temperature, the intake manifold runner control valve closes. Thus
the velocity of the air in the intake passage increases, promoting the vaporization of the fuel and producing a
intake manifold runner in the combustion chamber.
Because of this operation, this system tends to increase the burning speed of the gas mixture, improve
exhaust emission, and increase the stability in running conditions.
Also, except when idling and during low engine coolant temperature, this system opens the intake manifold
runner control valve.
In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow
resistance.
The intake manifold runner control valve is operated by the ECM.

ENGINE PROTECTION CONTROL AT LOW ENGINE OIL PRESSURE

ENGINE PROTECTION CONTROL AT LOW ENGINE OIL PRESSURE : System De-
scription

INFOID:0000000010986238

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

• The engine protection control at low engine oil pressure warns the driver of a decrease in engine oil pres-

sure by the engine oil pressure warning lamp a before the engine becomes damaged.

• When detecting a decrease in engine oil pressure at an engine speed less than 1,000 rpm, ECM transmits

an engine oil pressure warning lamp signal to the combination meter.The combination meter turns ON the
engine oil pressure warning lamp, according to the signal.

*: When detecting a normal engine oil pressure, ECM turns OFF the engine oil pressure warning lamp.

AIR CONDITIONING CUT CONTROL

JPBIA6226GB

JSBIA4201GB

Decrease in engine oil pressure

Engine speed

Combination meter

Fuel cut

Engine oil pressure warning 

lamp

Detection

Less than 1,000 rpm

ON*

NO

1,000 rpm or more

ON

YES

SYSTEM

EC-471

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AIR CONDITIONING CUT CONTROL : System Description

INFOID:0000000010986239

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
• When cranking the engine.
• At high engine speeds.
• When the engine coolant temperature becomes excessively high.
• When operating power steering during low engine speed or low vehicle speed.
• When engine speed is excessively low.
• When refrigerant pressure is excessively low or high.

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM : System De-
scription

INFOID:0000000010986240

DESCRIPTION

ECM transmits a target power generation voltage signal received from IPDM E/R to the generator via LIN
communication.
The generator includes a self-diagnosis function and transmits a diagnosis signal to ECM via LIN communica-
tion when detecting a malfunction. When ECM receives a diagnosis signal, ECM detects DTC and transmits a
charge warning lamp request signal to the combination meter to turn ON the charge warning lamp.

COOLING FAN CONTROL

JSBIA4542GB

EC-472

< SYSTEM DESCRIPTION >

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SYSTEM

COOLING FAN CONTROL : System Description

INFOID:0000000010986241

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pres-
sure, air conditioner ON signal. Then control system has 3-step control [HIGH/LOW/OFF].

Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays through CAN communication line.

JPBIA3233GB

JSBIA4541GB

Cooling fan speed

Cooling fan relay

1

2

3

Stop (OFF)

OFF

OFF

OFF