Nissan Versa (N17): Evaporative emission system

Nissan Versa 2nd generation (N17) Service Manual / Engine / Engine control system (EC) / Evaporative emission system

EVAPORATIVE EMISSION SYSTEM : System Diagram

EVAPORATIVE EMISSION SYSTEM : System Diagram

EVAPORATIVE EMISSION SYSTEM : System Description

INPUT/OUTPUT SIGNAL CHART

Sensor	Input signal to ECM	ECM function	Actuator
Crankshaft position sensor (POS) Camshaft position sensor (PHASE)	Engine speed*1 Piston position	EVAP canister purge flow control	EVAP canister purge volume control solenoid valve
Mass air flow sensor	Amount of intake air
Engine coolant temperature sensor	Engine coolant temperature
Air fuel ratio (A/F) sensor 1	Density of oxygen in exhaust gas (Mixture ratio feedback signal)
Throttle position sensor	Throttle position
Accelerator pedal position sensor	Accelerator pedal position
Battery	Battery voltage*1
Fuel tank temperature sensor	Fuel temperature in fuel tank
EVAP control system pressure sensor	Pressure in purge line
Combination meter	Vehicle speed*2

*1: ECM determines the start signal status by the signals of engine speed and battery voltage.

*2: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

SYSTEM DESCRIPTION

The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.

The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the vapor is stored there when the engine is not operating or when refueling to the fuel tank.

The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is proportionally regulated as the air flow increases.

EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating.

Cooling fan control

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Exhaust valve timing control
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P074C Unable to engage 4GR
Description This malfunction is detected when the A/T does not shift into 4GR position as instructed by TCM. This is not only caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc. DTC ...

Nissan Versa (N17): Evaporative emission system

Cooling fan control

Intake valve timing control

Other materials:

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