Nissan Sentra Service Manual: Intake manifold tuning system
INTAKE MANIFOLD TUNING SYSTEM : System Description
SYSTEM DIAGRAM
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
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.
- Engine speed: 5,250 rpm or more
- Engine coolant temperature: -30В°C (-22В°F) or more
- Battery voltage: between 11 V and 16 V
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:
If your vehicle overheats
If your vehicle is overheating (indicated by an
extremely high temperature gauge reading), or if
you feel a lack of engine power, detect abnormal
noise, etc., take the following steps.
WARNING
Do not continue to drive if your vehicle
overheats. Doing so could cause engine
dama ...
Symptom diagnosis
Audio system
Symptom table
Related to audio
Related to hands-free phone
Before performing diagnosis, confirm that the cellular phone being used
by the customer is compatible with
the vehicle.
It is possible that a malfunction is occurring due to a version change
of the phone ...
Low tire pressure warning lamp does not turn oFF
Low Tire Pressure Warning Lamp Stays On When Ignition Switch Is Turned On
DIAGNOSTIC PROCEDURE
1.INSPECT BCM CONNECTOR
Turn ignition switch OFF.
Disconnect BCM connectors.
Check terminals for damage or loose connections.
Is the inspection result normal?
YES >> GO TO 2.
NO > ...
