Fuel injection control subsystem

The main parameters that determine the operation subsystem, are the number of the incoming air, throttle position, coolant temperature, engine operation and the position of the crankshaft and camshaft. By signals from the oxygen sensor in the exhaust gazax, under constant air-fuel ratio correction. The engine management system also includes exhaust gas recirculation. Simultaneous operation of subsystems of the fuel injection control and ignition timing control performed by the controller from signals from sensors. In addition, the controller shuts off the fuel in excess of the maximum permissible engine speed, and controls the operation of the engine at idle forced to reduce engine speed to 2000 min-1. If the car is immobilizer, the controller compares the signal from the ignition switch, and signal Named

in his memory. The controller sends a signal to connect or disconnect power to the engine management system. If the car is equipped with air conditioning, the controller controls the relays electromagnetic compressor clutch to prevent disruption of the engine. In case of failure of any sensor device or a controller, depending on the fault goes to the standby mode of operation. The controller has a program

tracking of the system components and memory write fault codes in case of possible failures in their operation. Reading data from the memory is only possible using a special diagnostic equipment, which is connected to the diagnostic connector block located under the fuse box in the vehicle. The diagnostic equipment can also adjust the CO content in the exhaust gases.

The controller is a microprocessor with a digital programmable block and plug connector with 64-pin, numbered 1 to 48, then 101 to 116.

The numbering of connector pins of the controller is shown in Fig. 2.92, and their purpose is shown in Table. 2.10.

Table 2.10 Pin assignment connector controller

Location of the controller shown in Fig. 2.91. To access it, remove the duct floor heating saloon and lower diffuser heater.

If a fault occurs KSUD in the instrument cluster lights up orange, indicating a need for action to remedy the defect. Nevertheless, the controller will provide the engine for the bypass program, which will go by car for some deterioration in its economic and dynamic performance. Said indicator lights up when the ignition is switched on and goes out after a few seconds after starting the engine. If the car is immobilizer, the warning lamp informs the driver about its serviceability: flashing lights when the ignition signals a malfunction of the immobilizer.

The relay of inclusion of the controller is in the central part of the dashboard. Turning the output relay through "4" controller. Power relay, and the camshaft position sensor and the engine speed and air mass meter is supplied by the power circuit (controller terminals "38", "47", "109").

Colour marking blue relays. The supply voltage of 12 V. The resistance of the control winding 75 ohms.

The relay of inclusion of the fuel pump is located under the dash on the left

side of the mounting unit in the car. The controller connects to the "masses" through port "106" relay control circuit, providing power to the fuel pump. Power to the engine fuel pump is supplied with a delay of 5 seconds after the ignition is switched on and is carried out continuously after the controller receives information about the engine is started from the camshaft position sensor and the engine speed, or information about filing "+" to the starter via terminal "34" controller. After stopping the engine power to the relay continues to flow for 1 s.

Colour marking blue relays. The supply voltage of 12 V. The resistance of the control relay coil 75 ohms.

The relay of inclusion of electromagnetic compressor clutch is in the assembly block located on the right wing in the engine compartment.

On vehicles with air conditioning compressor is activated via relays electromagnetic clutch. By analyzing the signals from the various sensors, the controller does not permit the air conditioner when the malfunction of the engine. Thus, when the throttle position "full load" the controller will not allow the air conditioning. At idle, the engine includes a control relay fast idle speed, which increases the speed of the engine when the air conditioner.

Colour marking blue relays.

The supply voltage of 12 V. The resistance of the control winding 75 ohms.

Refrigerant pressure sensor is screwed into the desiccant disposed in front on the left side in the engine compartment. It sends information about the refrigerant pressure through port "41" of the controller and the computer of the interior temperature sensor of the evaporator inside the housing of the evaporator.

The solenoid valve and the EGR purge system is controlled by the absorber is located on the left side of the intake pipe in the engine compartment. The valve allows fuel vapors to absorb and carry out exhaust gas recirculation depending on the operating mode of the engine coolant temperature, the amount of intake air throttle position and vehicle speed. Exhaust gas recirculation and intake of fuel vapor occurs in the following cases:

- During the starting phase;

- A cold or overheated engine;

- At maximum load of the engine;

- When fast idling;

- When the vehicle speed below 10 km / h;

- At failure of the air mass meter.

After stopping the engine solenoid valve remains open. The supply voltage of 12 V. The resistance measured at the terminals of the solenoid valve, 32.6 ohms.

The throttle position sensor mounted on the throttle body and consists of a linear potentiometer, the movable contact of which is connected to the throttle valve axis. On the sensor from the controller supply voltage is applied, the output voltage is directly proportional to the angle of rotation throttle. The sensor provides information about the position of the throttle pedal "idle" or "full load". The position sensor is not adjustable. The supply voltage (between terminals "1" and "3" sensor) 5 B.

Air mass meter (Fig. 2.93) manufactured by Hitachi hot-wire type, capable of measuring the amount of intake air independently of the air pressure and air temperature. Enters the engine air flows around a thin platinum filament installed in the meter. The filament is part of a bridge circuit, bias voltage is regulated to zero by changing the heating current. The temperature of the heating filament is maintained constant by the electronic control circuit. An increase in the mass of the intake air is automatically increased accordingly filament current, thus maintaining a constant temperature of the filament. Filament current is a measure of the mass of air sucked in the engine. Parameter determining the mass flow rate of air entering the engine, a voltage required to maintain constant temperature of the filament. Within 1 seconds after each stop of the engine on command controller thread is heated to very high temperature to remove contaminants that could distort the output signal. Sensor supply voltage of 12 V.

The coolant temperature sensor is installed in the outlet fitting of the cylinder head rear right intake duct. The internal resistance of the sensor is reduced proportionally to the rise in temperature of the coolant. Colour marking: gray connector. The supply voltage of 5 V.

Optoelectronic camshaft position sensor and the engine speed of the disc is slotted. Instead of the slots on one side of the disc has two LEDs, on the other - two photodiodes. The disc rotates with the roller gauge-distributor. The disc has two rows of slots. Closer to the edge is located 360 slots. The angle between adjacent slits corresponds to 1 ?� crank angle. Closer to the center of the disc slot four are tagged position of the pistons in the cylinders. The widest slot is labeled for

1st cylinder.

With the engine running LEDs illuminate a rotating disk. Light passes through these diodes alternating slots and falls on the photodiodes, which are connected with the unit forming pulses. After processing the signals from the control unit 360 of the slots define the frequency of rotation of the crankshaft. The other four slots determine the firing order. On the basis of this information the control unit determines the optimum ignition timing and controls the switch, which is fed through the primary winding of the ignition coil.

Color marking a 6-pin connector: gray. The supply voltage of 12 V.

Sensor oxygen content in exhaust gases with integrated heating element which is mounted on the exhaust manifold upstream of the catalytic converter. The sensor delivers a signal to the controller voltage from 0.1 to 0.8 depending on the oxygen concentration in the exhaust gas, i.e. the degree of enrichment of the combustible mixture. The controller maintains the degree of enrichment according to the voltage supplied by the sensor. During a cold start at full load controller not responding to signals from the sensor. The supply voltage of 12 V.

In the exhaust system are two catalytic converter, one of which is located in the exhaust manifold and the other is mounted in the exhaust system.

The pressure sensor in the power steering is in the output high pressure pipe union on the right behind the steering pump in the engine compartment. Upon reaching the idling engine limit pressure in the power steering sensor sends a corresponding signal controller and the controller using the controller increases the idling engine speed. The supply voltage of 5 V.

Speed sensor of the inductive type comprises a pulse generator integrated into a speedometer drive, and stored on the clutch housing or torque converter. The generator produces a square wave amplitude 5, modulated frequency depending on vehicle speed. The signal is fed through a speedometer on the output "32" controller. The color marking of the connector: gray. The resistance across the terminals of the sensor 250 ohms.

Position sensor gear lever (on cars with manual transmission) installed on the clutch housing and sends the information to the controller to position the gear lever. Contact Sensor open when installing the gear lever in neutral and closed when you turn on any transfer. This conclusion is "35" the controller is connected to "weight". The controller thus prevents congestion at idle, and interruptions in the work of the engine at the time of gear change. The supply voltage of 5 V.

Selector lever position sensor (on vehicles with automatic gearbox) installed in the torque converter housing, and serves to transmit information to the controller of the selector lever. If the car is immobilizer, power sensor is connected to "weight" the output "35" of the controller when installing the gear lever in position ?�N?� or "P". The other provisions of the selector lever immobilizer prevents engine start, the controller prevents overloads at idle and disruptions in the motor gear. The supply voltage of 5 V.