Nissan Altima 2007-2012 Service Manual: Positive crankcase ventilation
Description
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 via 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 drawn from the air inlet tubes into the crankcase. In this process the air passes via the hose connecting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow via the valve.
The flow goes via 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 via the hose connection to the air inlet tubes under all conditions.
Component Inspection
1.CHECK PCV VALVE
With engine running at idle, remove PCV valve from rocker cover. A properly working valve makes a hissing noise as air passes via the it.
A strong vacuum should be felt immediately when a finger is placed over valve inlet.
Is the inspection result normal? YES >> INSPECTION END
NO >> Replace PCV valve.
On board refueling vapor recovery (ORVR)
Description From the beginning of refueling, the air and vapor inside the fuel tank go via the refueling EVAP vapor cut valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by th ...Refrigerant pressure sensor
Description The refrigerant pressure sensor is installed at the condenser of the air conditioner system. The sensor uses an electrostatic volume pressure transducer to convert refrigerant pressure ...Other materials:
Vin registration
Description
VIN Registration is an operation to registering VIN in ECM. It must be
performed each time ECM is replaced.
NOTE:
Accurate VIN which is registered in ECM may be required for Inspection &
Maintenance (I/M)
VIN REGISTRATION : Special Repair Requirement
1.CHECK VIN
Check th ...
Rear window defogger relay
Description
Power is supplied to the rear window defogger with BCM control.
Component Function Check
1. CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT
Check that an operation noise of rear window defogger relay [located in fuse
block (J/B)] can be heard when
turning the rear window de ...
Bluetooth® streaming audio without Navigation System (Type B) (if so
equipped)
If you have a compatible Bluetooth® audio device
that is capable of playing audio files, the
device can be connected to the vehicle’s audio
system so that the audio files on the device play
through the vehicle’s speakers.
Connecting Bluetooth® audio
To connect your Bluetooth® audio de ...