Nissan Juke Service and Repair Manual : Structure and operation

Positive Crankcase Ventilation

This system returns blow-by gas to the intake manifold.


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 conditions.

System


    Component parts
    Engine control system : Component Parts Location 1. IPDM E/R Refer to PCS-5, "Component Parts Location". 2. Battery current sensor (with battery temperature sensor) 3. Mass air flow ...

    System
    Engine control system : System Diagram Engine control system : System Description ECM performs various controls such as fuel injection control and ignition timing control. MULTIPORT FUEL INJE ...

    Other materials:

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    Description ECM controls ON/OFF state of the starter relay, according to the engine and vehicle condition. Models with no Intelligent Key System transmit a control signal directly to IPDM E/R. On the other hand, models with the Intelligent Key System transmit a control signal to IPDM E/R by w ...

    Diagnosis system (BCM) (without intelligent key system)
    Common item : consult-III Function (BCM - COMMON ITEM) APPLICATION ITEM CONSULT-III performs the following functions via CAN communication with BCM. SYSTEM APPLICATION BCM can perform the following functions for each system. NOTE: It can perform the diagnosis modes except the following for ...

    Key switch
    Component Function Check 1.CHECK FUNCTION 1. Select “DOOR LOCK” of “BCM” using CONSULT-III. 2. Select “KEY ON SW” in “DATA MONITOR” mode. 3. Check that the function operates normally according to the following conditions. Is the inspection result normal? YES >> Key sw ...