Nissan Sentra manuals

Nissan Sentra Service Manual: Intake manifold tuning system

Nissan Sentra Service Manual / Engine / Engine control system / System / Intake manifold tuning system

INTAKE MANIFOLD TUNING SYSTEM : System Description

SYSTEM DIAGRAM

SYSTEM DESCRIPTION


SYSTEM DESCRIPTION

This system switches the length of intake air path according to the low-to-medium speed range or high speed range. Torque is increased in the low-to-medium speed range and the engine output is improved in the high speed range.

Engine speed: Low and medium speed range


Engine speed: Low and medium speed range

Since the intake manifold tuning (IMT) valve is closed when the engine speed is less than 5,250 rpm, the length of the effective intake air path is from the mouth of intake manifold collector to the intake valve. This long path brings the inertia effect of intake air, contributing to the improvement in intake air efficiency and the generation of high torque.

Engine speed: High speed range

When engine speed is 5,250 rpm or more, ECM turns ON the intake manifold tuning valve motor to open the intake manifold tuning valve. The length of the effective intake air path at this time is from the intake manifold tuning valve to the intake valve. This short path brings the inertia effect of intake air in the high speed range, contributing to the torque improvement while the engine is running at high speeds. (The highest engine output is improved.)

Intake Manifold Tuning Valve Operating Condition

ECM opens the intake manifold tuning valve when all of the following conditions are satisfied.

Intake manifold runner control
INTAKE MANIFOLD RUNNER CONTROL : System Description SYSTEM DIAGRAM SYSTEM DESCRIPTION Intake manifold runner control valve has a valve portion in the intake passage of each cylinder. Whil ...

Engine protection control at low engine oil pressure
ENGINE PROTECTION CONTROL AT LOW ENGINE OIL PRESSURE : System Description SYSTEM DIAGRAM INPUT/OUTPUT SIGNAL CHART Sensor Input signal to ECM ECM function Actuator Engi ...

Other materials:

Car phone or CB radio
When installing a CB, ham radio or car phone in your vehicle, be sure to observe the following precautions; otherwise, the new equipment may adversely affect the engine control system and other electronic parts. WARNING A cellular phone should not be used for any purpose while dr ...

Charging system preliminary inspection
Diagnosis Procedure 1.CHECK BATTERY TERMINALS CONNECTION Check if battery terminals are clean and tight. Is the inspection result normal? YES >> GO TO 2. NO >> Repair battery terminal connection. Confirm repair by performing complete Charging system test using EXP-800 NI or G ...

Steering column
Inspection STEERING COLUMN ASSEMBLY Check each part of steering column assembly for damage or other malfunctions. Replace entire steering column assembly if any parts are damaged. Measure steering column rotating torque using Tool. Replace steering column assembly if outside the ...

© 2014-2020 Copyright www.nisentra.com