D21 Hardbody XE King Cab 4WD L4-2389cc 2.4L SOHC MFI (KA24E) (1997)
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Variable Valve Timing Solenoid: Description and Operation
SYSTEM DESCRIPTION
This system has a swirl control valve in the intake passage of each cylinder.
While idling and during low engine speed operation, the swirl control valve closes. Thus the velocity of the air in the intake passage increases,
promoting the vaporization of the fuel and producing a swirl in the combustion chamber.
Because of this operation, this system tends to increase the burning speed of the gas mixture, improve fuel consumption and increase the stability in
running conditions.
Also, except when idling and during low engine speed operation, this system opens the swirl control valve. In this condition, this system tends to
increase power by improving intake efficiency via reduction of intake flow resistance, intake flow.
When engine coolant temperature is below 0°C (32°F) swirl control valve is kept open.
COMPONENT DESCRIPTION
Swirl Control Valve Control Solenoid Valve
The swirl control valve control solenoid valve responds to signals from the ECM. When the ECM sends an ON (ground) signal, the solenoid valve is
bypassed to apply intake manifold vacuum to the swirl control valve actuator. This operation closes the swirl control valve. When the ECM sends an
OFF signal, the vacuum signal is cut and the swirl control valve opens.
