4C20 Gasoline Engine Repair Manual
(1) Cruise control master switch
11. Turbocharger control algorithms
• When cruise control is deactivated with the switch, the speed stored in the engine control unit is deleted.
• To activate cruise control, the system must be switched on using the main switch. After that, you can control
the system functions, such as the selection and regulation of the speed of movement.
The task of turbocharger control is to regulate the boost pressure by controlling the bypass valve and the
relief valve to control the amount of air entering the engine depending on the load.
(2) Cruise control CANCEL switch
(4) RES/ACCEL button
• Return to driving mode at the selected speed. Pressing this button (if the cruise control is activated using the
main switch and if the vehicle speed exceeds 40 km/h) returns to the selected speed mode. This automatically
restores the last set value of the selected speed.
• This switch allows you to exit the selected speed mode if it is activated.
12. High pressure fuel pump control algorithms
• Pressing the button to increase the speed Each press of the button increases the speed by 3 km/h
• Hold down the button to accelerate If the vehicle is moving at the selected speed, long pressing this button
will increase the vehicle's speed.
The injection pump is a single-plunger pump that supplies fuel to the fuel rail. The plunger of this pump is
driven by the crankshaft using a pusher. In addition, the amount of incoming fuel is controlled based on an
electronic signal from the engine's electronic control unit. At the inlet, the injection pump is connected to the low
pressure fuel line. Fuel from the fuel tank through the fuel priming pump and the low pressure fuel line enters the
injection pump filter. The injection pump has a bypass valve for precise control of fuel consumption. As the
plunger moves inside the pump, the fuel pressure rises. If the pressure in the fuel rail is lower than the pressure
created by the injection pump, the fuel from the pump through the high pressure fuel line is supplied to the rail. If
the pressure in the fuel rail is higher than the maximum set pressure, the fuel returns to the pump through the
bypass valve. This is necessary to relieve pressure in order to protect the fuel rail. The bypass valve with
solenoid coil is activated when a peak/"protective" current is applied. Two terminals of the e/m coil are connected
to the injection pump, which is directly connected to the engine control unit and the onboard network via the
engine wiring harness. Control signals from the engine control unit through the e / m coil are fed to the injection
pump to control the bypass valve of the pump. Under the influence of the electromagnetic force created when
current is applied to the injection pump, the bypass valve closes to ensure that the specified fuel pressure is
maintained. When the power is turned off from the high pressure fuel pump e / m, the power on the coil
automatically disappears, after which the bypass valve opens under the action of the return spring and the fuel
passes through it.
• Pressing the Res/ACCEL button again activates the cruise control mode if the speed exceeds 40 km/h. This
restores the last value of the selected speed.
(3) SET/COAST button
13. Cruise control algorithms
The cruise control system controls the speed of the vehicle by adjusting the throttle position based on the
output of the accelerator pedal position sensors. After the cruise control is started, the throttle position is
determined with great accuracy, which is necessary to maintain the set speed and precisely control the
composition of the working mixture. The calculations are based on the output of the accelerator pedal position
sensors.
• Set speed as selected. When this button is pressed (if the cruise control is activated using the main switch
and if the vehicle speed exceeds 40 km/h), the selected speed mode is activated.
(a) Basic information about the main functions
• Using this switch to reduce the driving speed. When cruise control is in use, each time this button is pressed,
the speed will decrease by 3 km/h. When the button is pressed, the time it is held down should not exceed
400 ms;
• Long press the button to slow down the car. If the vehicle is moving at the speed selected by the driver, a long
press on this button will gradually reduce the vehicle's speed. In this case, the time of holding the button
should exceed 400 ms.
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Machine Translated by Google
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