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:

TCM
Exploded View Bracket TCM : Vehicle front : N·m (kg-m, in-lb) Removal and Installation CAUTION: When replacing TCM, note the “CVTF DETERIORATION DATE” value displayed on CONSULT “CONFORM CVTF DETERIORTN” in MAINTENANCE BOOKLET, before start the opera ...

Continuously Variable Transmission (CVT) (if so equipped)
WARNING Do not depress the accelerator pedal while shifting from P (Park) or N (Neutral) to R (Reverse), D (Drive) or L (Low). Always depress the brake pedal until shifting is completed. Failure to do so could cause you to lose control and have an accident. Col ...

Diagnosis system (ipdm e/r) (with intelligent key system)
Diagnosis description Auto active test Description In auto active test, the IPDM E/R sends a drive signal to the following systems to check their operation. Front wiper (lo, hi) Parking lamp License plate lamp Tail lamp Front fog lamp (if equipped) Headlamp (LO, HI) A/C compress ...

© 2014-2019 Copyright www.nisentra.com