AK703834 AE
Positive crankcase
ventilation valve
EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-29
1. Insert a thin rod into the positive crankcase
ventilation valve from the side shown in the
illustration (cylinder head cover installation side),
and move the rod back and forth to check that the
plunger moves.
2. If the plunger does not move, there is a clogging
in the positive crankcase ventilation valve. In this
case, clean or replace the positive crankcase
ventilation valve.
EVAPORATIVE EMISSION CONTROL
SYSTEM
GENERAL INFORMATION (EVAPORATIVE
EMISSION CONTROL SYSTEM)
M1173005102047
The evaporative emission control system prevents
fuel vapours generated in the fuel tank from escaping
into the atmosphere.
Fuel vapours from the fuel tank flow through the
vapour pipe/hose to be stored temporarily in the can-
ister.
When driving the vehicle, fuel vapours stored in the
canister flow through the purge control solenoid
valve and purge port and go into the inlet manifold to
be sent to the combustion chamber.
When the engine coolant temperature is low or when
the intake air quantity is small (when the engine is at
idle, for example), the engine control unit turns the
purge solenoid off to shut off the fuel vapour flow to
the inlet manifold.
This does not only insure the driveability when the
engine is cold or running under low load but also sta-
bilize the emission level.
SYSTEM DIAGRAM
AKB00861AB
Engine-ECU
Air flow sensor
Intake air temperature sensor
Manifold absolute
pressure sensor
Engine coolant
temperature sensor
Crank angle sensor
Battery
Purge control
solenoid valve
Engine control
relay
Canister