What is the fault phenomenon and cause of electronically controlled engine without oil supply or low

1) Fault phenomenon: 1) The engine cannot be started or gradually stalled when it is running. 2) When the oil supply pressure of the fuel supply device is detected, the oil pressure is too low or zero. 3) The engine can start, but the power is obviously insufficient, and the acceleration is poor.

2) Cause of failure: 1) There is no oil in the fuel tank or the fuel tank switch is not turned on.

2) The pipeline from the fuel tank suction pipe through the gasoline filter, gasoline pump to the fuel distribution pipe inlet pipe joint, there are blockages, oil leakage, water accumulation, icing or gas resistance and other faults. 3) The electric gasoline pump is not working well or fails. 4) The oil pressure regulator is not working well.

5) The oil pump relay is not working well.

6) The oil pump switch cannot be closed. 7) There is an open circuit or short circuit in the control circuit. 8) The ECU of the oil pump is damaged.

Hello, 1. The engine does not supply oil: the vehicle cannot be started;

Faults: Fuel pump failure, ECU computer failure, fuel relay damage, short circuit or loose plug, etc.

2. Low engine oil supply pressure: the vehicle is unstable or weak after starting;

Faults: Faulty fuel pump, faulty fuel pressure regulator, clogged gasoline filter, low supply voltage, etc.

The automotive electronic control system consists of sensors, switching signals, electronic control units and actuators.

1.The electronic control system of the car is an important part of the car, and the performance of the electronic control system directly affects the driving comfort of the car and the fuel economy of the car. With the continuous development of the automotive industry, the electronic control system of the automobile has been continuously upgraded, and large-scale integrated circuits and microprocessors have been used to improve the electronic control system of the automobile.

The mechanical operation mode of the automotive electronic control system is converted into the electronic control mode, which improves the control accuracy of the automotive electronic control system and increases the control content. The electronic control system of the car, including the engine electronic control system, the automobile anti-skid control system, the automobile suspension control system, etc., corresponds to the respective sensors and control units to complete remote control.

2.Automotive electronic control refers to; Automotive electronic control systems, such as; Automobile motor control system, automatic transmission electronic control system, brake anti-lock braking system, airbag system, electronic control suspension system, electronic power steering system, automatic air conditioning system, etc.

3.Automotive electrical appliances refer to various electrical components and electrical equipment that make up the automotive electronic control system. For example; Automobile on-board computer, various sensors, actuators, automobile generators, electrical circuits, batteries, lights, horns, wipers, tape recorders, electronic locks for doors and windows, instrument panels, and other electrical equipment.

(1) Fault phenomenon.

The engine does not start or gradually stalls at work.

When the supply pressure of the fuel supply device is detected, the oil pressure is too low or zero.

The engine starts, but the power is obviously insufficient and the acceleration is poor.

2) Cause of failure.

There is no oil in the tank or the tank switch is not turned on.

The pipeline from the fuel tank suction pipe through the gasoline filter, gasoline pump to the fuel distribution pipe inlet pipe connection, there are faults such as blockage, oil leakage, water accumulation, ice or gas blockage.

Electric gasoline pumps are not working well or fail.

The oil pressure regulator is not working well.

The oil pump relay is working poorly.

The oil pump switch cannot be closed.

The control circuit has an open circuit or a short circuit.

The ECU of the oil pump is damaged.

The reason why the engine does not supply oil is because the nozzle fuel injector pressure relief rail pressure is too low, resulting in no oil supply. The EFI engine uses electronic control of fuel injection and discharge, so if the pressure is too low, the oil will not be supplied.

The EFI engine of the car does not supply oil or the oil pressure is low, which is often caused by factors such as dirty fuel injectors, dirty throttle valves or untimely replacement of fuel filters.

The specific reason for the analysis is that there is a problem with the fuel pressure, and the fuel pump is relieved of the pressure, and the oil pressure is relieved quickly, and the pressure accumulator is not good.

Second, the fuel pressure adjustment is damaged, and the oil pressure can be maintained for a while.

The third injector is not well sealed, and the pressure relief is slower. Short-term parking does not affect starting.

There are two reasons: first, the gasoline pump is not working, the oil pressure is not reached, and the second is that the oil pressure is not working, and the pressure is relieved! No other reason! Just start with these two forehands! There must be no leaks in the tubing either!

The reason why the fuel pressure of the EFI engine is too low: If the oil pressure of the EFI car is too low, it is easy to cause unstable idling, the engine is shaking, and the road driving power is insufficient.

Hello, the low oil pressure of the EFI car is insufficient for fuel supply, the first consideration is the gasoline pump, and the possibility of gasoline filtration is not ruled out.

The car EFI engine does not supply oil or the oil pressure is low, and the pollution phenomenon, such as the car shaking badly, or the occasional stalling reason, is mainly due to insufficient fuel supply and small spray.

If the fuel pressure is insufficient and the oil supply is not smooth, the oil will not be added, if the engine is missing cylinder, the ignition coil will be damaged, and the air flow meter will not be oiled. It is recommended to check the oil circuit and sensor one by one.

Faulty sensor sections, air flow sensors, throttle position sensors, coolant temperature sensors, rotational speed or crankshaft position sensors, etc.

If there is no shortage of fuel, check the electronic pump, the electronic pump is malfunctioning.

1. The oil supply is not smooth due to the blockage of the oil circuit.

2. The pressure relief rail pressure of the fuel injector is too low. As a result, the oil supply is not available.

3. The pressure relief rail pressure of the common rail pressure limiting valve is too low, resulting in no oil supply. EFI diesel engine refers to a diesel engine that uses electronic control of fuel injection and emissions. The whole system consists of three parts: sensor, ECU and actuator.

In the D-type electronic control system, the throttle position sensor and the intake pressure sensor are important sensors to detect the load of the engine, if one of them is broken, the computer can continue to run the engine using the alternative value, but the working conditions are relatively poor, and the failure will be different depending on the degree of damage.

If the throttle position ** device is damaged, it may not be able to add fuel, and there is a certain speed to drive a frustrated car. In the VOSE M154 electronic control system, the computer adjusts the number of steps of the idle motor according to the load, maintains the normal speed of the engine, and when the signal such as virtual connection of the line during work, the idle motor is not controlled or the internal abnormality occurs, the computer controls the speed of the engine, and the speed of the engine is limited to a certain speed.

The oil circuit is blocked, and the oil ** is insufficient. The nozzle pressure relief guide pressure is too low. The pressure of the common rail limiting valve pressure relief guide is too low.

Diesel engines that use electronically controlled fuel injection and emissions are electrically injected diesel engines. The EFI diesel injection system consists of three parts: sensor, ECU (computer) and actuator.

The phenomenon and reasons for the lack of oil supply or low oil supply pressure in the automobile gasoline engine are as follows:

1) Fault phenomenon: The engine cannot be started or gradually stalled when it is running; When the supply pressure of the fuel supply device is detected, the oil pressure is too low or zero. The engine starts, but the power is obviously insufficient and the acceleration is poor.

2) The cause of the failure is that there is no oil in the tank or the tank switch is not opened; The pipeline from the fuel suction pipe of the fuel tank through the gasoline filter, gasoline chestnut to the inlet pipe of the fuel distribution pipe has faults such as blockage, oil leakage, water accumulation, icing or gas blockage;

Electric gasoline pumps are not working well or fail. The working water of the oil pressure regulator is good; The oil chestnut relay is not working well; The oil pump switch cannot be closed. The control circuit has an open circuit or a short circuit. The ECU of the oil pump is damaged.

Unstable car idling is a common car failure, and when the idle instability is serious, it may cause the engine to stall, and it is often sent to the repair shop. Is it only the throttle carbon deposits that cause idle instability? What are the reasons why the engine is unstable and easy to stall?

What are the phenomena that manifest themselves at the same time? Let's find out.

1. Vacuum leakage in the inlet pipeline.

If the recent pipeline leakage is characterized by the fault at idling, the vacuum degree of the inlet pipeline is the largest, which is the most serious phenomenon of air leakage. Because of this feature, it means that the air intake pipe leak fault has the greatest impact at idle and low speeds, while the air leakage is smaller at medium and high speeds, and does not affect the operation of the engine too much.

Treatment: Check the connections at the various connections of the intake duct to find the leakage. It can be checked according to the negative pressure.

2. Idle instability caused by improper idle speed adjustment, excessive dirt of the throttle body, poor work of the idle control system, etc.

This main fault is caused by carbon deposition on the throttle, which is generally to wash the throttle, remember to use a special throttle cleaner, not a carburetor cleaner. It is necessary not to corrode the rubber of the throttle.

3. The fuel pressure is unstable.

The fuel atomization state of the fuel injected from the fuel injector is poor, forming lines or oil droplets, you can check for excessive wear or poor contact of the brushes, or the fuel pump filter is blocked, the fuel filter is blocked, the spring elasticity of the fuel pump safety valve is too small, the deformation of the inlet pipe is small, and the return pipe is blocked.

4. The exhaust gas recirculation valve is blocked or the bottom is leaking.

5. Fuel pump relay, EFI relay, ignition relay and other poor work.

6. The fuel pump drive circuit and fuel injector drive circuit have poor contact.

7. The ignition system works poorly.

Check the ignition coil and spark plug.

8. ECU protective oil cut-off.

Check the sensor. If some sensors fail, the ECU will not be able to correctly determine the current state and will issue a command to stop the fuel injection.

There is also a common cause of unstable stalling of idling, if your battery life is too long, the self-starting battery is generally used for two years, and the ordinary general service life is three years, if the battery has a long service life, and it is easy to turn off during driving, and the indicator light will flash when ignition. You can also measure whether the battery voltage is 12V, whether it is about 14V after ignition, if the voltage is not reached, it is recommended to replace your battery.

A carburetor is a mechanical device that mixes a certain proportion of gasoline with air under the action of vacuum generated by the operation of the engine. The carburetor is a delicate mechanical device that uses the kinetic energy of the inhaled air stream to atomize gasoline. Its important role in the engine can be called the "heart" of the engine.

Its complete device should include a starting device, an idle device, a medium-load device, a full-load device, and an acceleration device. The carburetor will automatically mix out the corresponding concentration according to the different working state requirements of the engine, and output the corresponding amount of mixture, in order to make the mixture mix more uniformly, the carburetor also has the effect of atomizing the fuel for the normal operation of the machine.

Carburetor problems: the throttle is uncertain, the oil cannot be oiled, the combustion is not complete, the serious failure to start, the driving is weak, and the impurities in the gasoline can not be filtered, and the valve gasket and cremation plug will also cause serious carbon deposit. General Approach:

If it is dirty, spray the filter with a gasoline gun, and replace it with a new one if it is broken.

If the carburetor is broken, the following phenomena will occur: 1. The engine is unstable at idle, difficult to start, and weak acceleration. The carburetor is located near the engine cylinder and is connected to the engine by an intake pipe; 2. The other end of the carburetor is connected to the fuel tank through the oil pipe.

The carburetor is a mechanical device that mixes a certain proportion of gasoline with air under the vacuum generated by the engine work, and the carburetor will affect the performance of the car to varying degrees.

There may be three reasons for the failure of the carburetor due to insufficient oil supply

1. Abnormal ignition (check spark plugs, high-pressure packs, igniters, pulse coils and other electronic components) 2. Poor oil circuit (check whether the oil circuit from the oil tank to the carburetor is smooth, clean the carburetor and clean the air filter).

3. Engine (check whether the compression ratio in the cylinder is up to standard, and whether the ignition time of the valve mechanism is normal).

The main fault phenomena caused by the failure of the automobile carburetor engine when the oil supply or the bull pressure is low are the engine shaking, and the idle speed of the engine is obviously low or high, and the engine is obviously insufficient power.

The fault phenomenon of automobile carburetor engine not supplying oil or low oil supply pressure is that the car shakes badly, emits black smoke, or occasionally stalls.

The fuel switch or fuel filter is blocked, resulting in poor oil supply and poor oil in the carburetor; 4. If it is a negative pressure self-priming fuel switch, the negative pressure pipe is loose or cracked, resulting in air leakage, resulting in insufficient negative pressure of the fuel switch and resulting in a carburetor.

(1) Fault phenomenon.

Under the condition that the ignition system is working normally, the engine cannot be started or stalled while driving.

Pull the choke knob or press the accelerator pedal several times, and it can barely start. The carburetor has a tempering phenomenon during acceleration (tempering is when the flame enters the carburetor from the intake manifold and sprays from the carburetor), but it quickly stalls.

The oil is pumped with a gasoline pump hand trolley, and after the carburetor float chamber is filled with gasoline, the engine can run for a short time, but the engine will gradually turn off after a short running time.

The engine gradually stalled during operation.

2) Cause of failure.

The fuel tank switch is not fully opened or closed, and the tank cap ventilation is blocked.

There is no oil in the fuel tank or the oil level is low, the oil pipe is blocked or desoldered, there are cracks, and the gasoline cannot be absorbed.