Toyota Corolla

1992-1998 of release

Repair and car operation

Cars are equipped with system of electronic injection of fuel (EFI system) into which three subsystems – fuel system enter, system of a fence of air and an electronic control system

FUEL SYSTEM

The fuel pump located in a tank, provides supply of fuel under constant pressure in the distributor from which fuel is evenly distributed on nozzles. From the distributor fuel moves to inlet canals of cylinders through nozzles. The amount of injected fuel is strictly supervised by the electronic control unit (ESM-blokom). The regulator of pressure of fuel provides change of pressure of fuel according to depression on a soaking-up collector. The fuel filter is mounted between the fuel pump and the distributor of fuel and intended for purification of gasoline and protection of units of system of injection against failure.

SYSTEM OF THE FENCE OF AIR

The system of a fence of air consists of the air filter, the chamber of a butterfly valve and the channel connecting these two units. The sensor air temperatures (IAT sensor) traces temperature of taken-away air. The signal from the sensor arrives on the electronic control unit which provides a dosage of injected fuel according to air temperature. A butterfly valve the driver operates. In process of opening of a butterfly valve speed of arriving air that leads to fall of its temperature increases. The sensor registers change of air temperature and gives a signal on the ESM block which in turn gives the signal increasing a dose of injected fuel, on nozzles.

ELECTRONIC CONTROL UNIT (ECM-BLOK)

Management of electronic injection of fuel and other systems is provided with the electronic control unit which in turn is a part of the central computer control system (CCS-system). Structure ESM-bloka includes the microprocessor.

On the control unit signals from a number of sensors which trace such parameters as air temperature on an entrance in cylinders, a butterfly valve angle of rotation, temperature of cooling liquid, number of turns of the engine, speed of movement of the car and the content of oxygen in exhaust gases arrive.

On the basis of these data the control unit defines duration of injection of fuel at which maintenance of an optimum ratio of gasoline and air in gas mixture is provided. Some of these sensors and the corresponding relays working from the control unit, are not a part of system of electronic injection of fuel, however are mounted on all space of a motor compartment.

More detailed description of the control unit and systems of electric equipment of the engine operated from this block is provided in subsection 6.2.

Check

PERFORMANCE ORDER

1. Check reliability of all connections with weight. Check conducting and system sockets. Weakening of electric connections and bad contact to weight can cause many malfunctions which are observed as serious refusals. 2. Check degree of a zaryazhennost of the battery. Normal operation of sensors and actuation mechanisms of a dosage of fuel depends on supply voltage. 3. Check a condition of the air filter, pollution of a filtering element can cause essential deterioration of operational indicators, including profitability (see subsection 2.7.2). 4. If the fused safety lock is found, replace it and check work of the corresponding chain. If the safety lock fuses again, find in conducting the wire closed on weight. 5. Check tightness of the channel of an air line from the filter to an inlet collector. Existence подсоса air in an air line leads to excessive pauperization of a mix. Check also a condition of the vacuum hoses connected to an inlet collector. 6. Remove from the butterfly valve chamber an air line and check existence of deposits of a deposit and resinous deposits. At pollution wash out the case an aerosol cleaner of the carburetor and clean a toothbrush (at first be convinced, having read the instruction on a ballonchik that the cleaner is harmless to sensors of oxygen and catalytic converter). 7. On the working engine put a stethoscope to each of nozzles and hear to the characteristic clicks indicating normal work of nozzles. 8. If the stethoscope is absent, use a long screw-driver. The termination of a screw-driver put to a nozzle, and an ear approach to the handle. 9. If listening yields doubtful results, buy the special light indicator of nozzles and insert it into the nozzle socket. Start the engine and be convinced that on each socket of a nozzle light flashes. So the size of the tension submitted on nozzles is checked. 10. On the idle engine disconnect sockets from nozzles and check resistance of each nozzle. Resistance of each nozzle should be within 13,4–14,2 Ohm. If resistance differs, a nozzle replace. 11. Other checks should be carried out in car-care center service, or in a specialized workshop as malfunction of the control unit can be the reason of abnormal work of system.