FAW Jiefang J6 truck cab assembly

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Electronic controlled gasoline injection (EFI) refers to the use of electronic controller (EFI computer) to control the nozzle, to the hair power machine to provide the required amount of fuel. There are two types of electronic control fuel injection device, a flow sensor (EFI-L), with the air flow as the main control parameter, also known as flow type; the other is a pressure sensor (EFI--D), the intake manifold pressure as the main control parameter, so also known as pressure type. system adopts the vane air flow meter L EFI engine, through the air inlet flow angle measurement board, parameters of the electronic controller according to the engine intake, engine speed, throttle position, solar term cooling water temperature, air temperature, oxygen content in exhaust gas, control of injection duration. In general, the injection is divided into two groups, each group is divided into groups, each group is divided into groups. L electronic controlled gasoline injection system on the intake system, fuel supply system and electronic control system, as shown in figure 7- 7. using L type electronic fuel injection system of the automobile in use may encounter some trouble, namely (1) the engine start-up difficulties mainly caused by the difficulties of starting the engine intake system leakage are: 1. The cold start valve does not start when the fuel injection or injection duration is too short. At this time should check whether the injection of cold start valve and at the time of the ambient temperature, fuel injection duration is accurate. Starting valve solenoid cold resistance measurement, check the temperature for a time switch cold start valve fuel injection time, usually in a 20C duration of 8s, when the temperature is 35 degrees centigrade, cold start valve fuel injection), a time switch resistance temperature values in the temperature lower than 10 DEG C for 40^-705 is higher than 35 degrees infinite. air flow meter imbalance. Air flow meter (that is, air flow sensor) X board swing card, and even cause flow m meter pump contact switch can not be closed, so that the electric gasoline pump does not work and can not start. the low oil pressure system. System oil pressure is too low, can cause the fuel injection quantity to reduce, the atomization quality becomes bad. Usually, the system oil pressure in the 200kPa or so, if the oil pressure is too low, should carefully check whether the pressure regulator vacuum tube to play a role. channel 1 electronic controller plug and socket connection loose. If the electrical f controller is damaged, should be replaced by professional personnel. (2) the rate of bad or unstable cause the engine idling bad or unstable main reason is: air intake system leakage, air flow sensor misalignment. cold start valve (cold start nozzle 2 oil spills or drops of oil. the auxiliary air valve is normally open (open, closed in the car cold hot car). air flow sensor x board card issuing. find the throttle idle position adjustment screw bit sharp. the solar term door opening sensor in idle contact is not working properly. the injector (nozzle) injection or injection (bad should carefully check the injector coil resistance meets the requirements, and to observe the shape of injection is normal). The electronic controller plug loose connection. (3) CO (carbon monoxide) emission standard when CO exceeds the standard, the main reason is: the air leakage of the air intake system, so that the CO adjustment is invalid. Cold start valve leakage, so that the idle mixed gas is too thick, CO increased. The cooling water temperature sensor and the inlet temperature sensor fault.