What s going on with the engine fault light on the dashboard?

The computer control system is commonly known as the engine management system, which is composed of an on-board computer (ECU or ECM or PCM), various sensors (such as intake flow meter, crankshaft position sensor, camshaft position sensor, throttle position sensor, oxygen sensor, water temperature sensor, etc.), a variety of actuators (such as fuel injectors, ignition coils, electronic throttle drive motors, idle valves, etc.), control programs, etc. If the system detects an engine failure, especially one that affects emissions, the driver is alerted by a fault light on the dashboard. When the engine system is normal, the fault light will turn on when the ignition switch is turned to the ON position, but after the engine starts, the light will automatically turn off.

If the light does not turn on when the ignition is turned to the ON position, or the light remains on after the engine is started, or the light suddenly lights up automatically when the engine is running, it indicates that the car's emission control system and engine management system are malfunctioning.

When the car's emission control system and engine management system fail, the driver should immediately drive the vehicle to the nearest repair shop for maintenance. The repair station is usually tested by computer, which can read the fault code stored in the engine control computer, and then further detect the fault according to the fault code, so as to ensure that the fault is completely repaired in a targeted manner.

Engine indicator refers to the indicator light used to show the working condition of the vehicle's engine. The indicator light is used to show the working condition of the vehicle engine, when the key door is opened, the vehicle self-test, the indicator light is lit and automatically extinguished, if it is always on, it means that the engine of the vehicle has a mechanical failure and needs to be repaired.

With the development of automobile gasoline engines in the direction of high speed, high compression ratio, high power, low fuel consumption and low emissions, the traditional ignition device has not adapted to the requirements of use.

Just because the engine fault light is on doesn't mean the engine won't work. First of all, the fault light is on, it is necessary to detect and repair, if you happen to be near the maintenance station, you can check it at any time, it is best to check it immediately, if you are far away from the maintenance station, and there is no time to go to the maintenance station to check, as long as you feel that there is no obvious fault in the engine, you can do it first.

Reasons for the failure of the light: no regular maintenance, abnormal sensor, poor combustion of the mixture.

1. There is no regular maintenance

If the owner does not have regular maintenance, coupled with bad driving habits for a long time, it is easy to bring a great burden to the operation of the engine, so as to remind the owner of timely maintenance through the fault light.

2. The sensor is abnormal

Included aerobic sensor, water temperature transmitter, etc. When the sensor is damaged, the signal is interrupted or the contact is poor, resulting in the ECU not being able to obtain specific engine data, resulting in the fault lamp being lit.

3. Poor combustion of mixed gas

When the engine spark plug fails, the fuel pump fails, or the ignition coil fails, these can cause the mixture to burn poorly. Once the mixture combustion is poor, it will cause carbon deposition or detonation in the engine, and when these conditions are detected by the engine oxygen sensor, it will be directly transmitted to the ECU, resulting in the fault lamp being lit.

Resolution

1. Maintain the vehicle regularly and maintain good driving habits.

2. If the oxygen sensor fails, the engine fault light will turn on, and the owner needs to repair or replace it. If the water temperature sensor fails, the engine will not be well cooled, which will reduce the service life of the engine, and the coolant should be replaced in time.

3. The air supply should be adjusted if the mixture combustion is poor.

1. There are two situations when the fault light of the engine on the car dashboard is on, the first is that when the car power is turned on, the vehicle will carry out self-inspection, at this time, not only the engine yellow light will be on, but other fault lights will also be lit together, and then they will be extinguished together, which is a normal phenomenon; The second is that after the car starts, the yellow light of the engine fault is still on, which is an abnormal phenomenon that the ECU is reminding the engine that there is a fault.

2. When the engine fault light on the dashboard is on, you can try to start and turn off the vehicle three times in a row, or turn off the negative pole of the engine battery, wait for 30 seconds to connect it, and then try to start. After doing the above method, see if the engine fault light on the dashboard is still on. It should be noted that when the engine fault light on the general dashboard is on, it cannot be eliminated manually, and it is usually eliminated after troubleshooting with a 4S shop fault detector.

It is generally related to the quality of the fuel, the oxygen sensor, the spark plug, the concentration of the mixture, etc.

The engine failure light on the dashboard is on: the fuel quality is not good.

Because of the poor quality of the fuel, the combustion state is not good, resulting in the engine failure light on; Because the engine has a faulty electronic control system or some mechanical parts, it is impossible to ensure the normal operation of the engine, such as: damage to spark plugs, sensors, actuators and even the engine control unit, which will cause the vehicle to accelerate weakly, and cause the engine failure light to turn on.

The cylinder inside the engine of the vehicle is dirty or has a lot of carbon deposits, and the carbon deposits have strong adsorption, which will adsorb the fuel particles in the mixture, affect the normal operation of the engine, and cause the engine failure light to be on. Generally, when the engine light is on, you can first add the fuel additives recommended by the manufacturer or replace the fuel to discharge the fuel problem.

If the fault can still try to clean the engine intake system, after eliminating the above two reasons, if the engine fault light is still on, it means that the vehicle is likely to be because the engine has failed, and it needs to be monitored and repaired at the maintenance station.

1. Identify the cause of the failure. For diagnostics of such faults in which the engine does not start, the battery should be tested first. It is necessary to find out if the engine does not start because the battery is insufficient.

2. Detect ignition timing. Timing belt slippage is the root cause of the failure that there is no electric spark and the engine cannot start.

3. Detect the starting system. In the case of faults such as engine failure to start, the first thing to do is to check the circuitry in the engine starting system. From the perspective of the most basic composition, the circuit of the starting system generally includes the following basic parts, that is, the battery, the starting motor and the cable connecting these parts.

Of course, in addition to this, ignition switches, starter relays or solenoid coils, as well as in-vehicle anti-theft systems, are also important components of the starting system.

4. Detect the quality of electric sparks. Once the circuitry of the starting system has been tested and proven to be fine-tuned, attention should be focused on why the engine is not working. Generally speaking, the ignition system of the engine is tested first, which is also the easiest inspection job.

In early ignition systems, you could easily remove the ignition coil and use a spark detector to detect if the spark was normal. When choosing a spark detector, an adjustable detector is preferable to a fixed design because it allows you to adjust the detector to a smaller gap so you can tell if there is no spark at all, or if there is an electric spark but it is weak.

5. Detect the fuel system. The diagnosis of the fuel system can be divided into two parts: the diagnosis of the fuel supply system and the diagnosis of the injector circuit system.

The fuel supply system can be detected by measuring the flow and pressure of the fuel. The best way to measure fuel flow is to inspect the line when there is a load in the fuel supply line.

The car dashboard shows the reason why the engine failure light is on:

1. The car cannot be started after the engine fault light is on, this may be that the fuel pump cannot pump oil or the ignition system fails, then of course it cannot be opened, directly hit the ** roadside assistance, tow away, if the fault light is on but does not affect driving, at this time it may only be a sensor failure or a false fault, in this case, you can consider driving to a nearby maintenance point for maintenance;

2. The engine fault light is on and the vehicle can be driven, but the body has serious shaking, slow driving, weak acceleration and other symptoms, please do not continue to drive, continuing to drive may cause serious damage to the engine, and may cause other unnecessary failures, it is recommended to stop on the right immediately, call rescue**, and wait for road support;

3. The yellow symbol light indicates that the engine is faulty, but the fault does not affect the normal operation of the engine, but it must be maintained, and the red symbol light indicates that the engine has a serious fault, and it needs to be repaired immediately under normal circumstances. It is not necessarily that the fault light is on, it must be a major fault, generally speaking, the fault light of the dashboard of a new car or a new car indicates that there is a problem in a certain aspect of the vehicle.

Hello, there may be the following:

1. The car cannot be started after the engine fault light is on, this may be that the fuel pump cannot pump oil or the ignition system fails, then of course it cannot be opened, directly hit the ** roadside assistance, tow away, if the fault light is on but does not affect driving, at this time it may only be a sensor failure or a false fault, in this case, you can consider driving to a nearby maintenance point for maintenance;

2. The engine fault light is on and the vehicle can be driven, but the body has serious shaking, slow driving, weak acceleration and other symptoms, please do not continue to drive, continuing to drive may cause serious damage to the engine, and may cause other unnecessary failures, it is recommended to stop on the right immediately, call rescue**, and wait for road support;

3. The yellow symbol light indicates that the engine is faulty, but the fault does not affect the normal operation of the engine, but it must be maintained, and the red symbol light indicates that the engine has a serious fault, and it needs to be repaired immediately under normal circumstances. It is not necessarily that the fault light is on, it must be a major fault, generally speaking, the fault light of the dashboard of a new car or a new car indicates that there is a problem in a certain aspect of the vehicle.

If the instrument indicator is not lit, first check the power supply fuse of the dashboard, and replace it if it is blown. Disassemble the dashboard, the lights are generally at the back of the dashboard, replace the lights that are not lit, and generally the individual lights are not lit to indicate that there is no problem with the fuse and wire, the main reasons are as follows

1. The lamp of the dashboard is damaged and needs to be replaced in time;

2. If the power supply line of the dashboard is broken, there is an open circuit or short circuit, which will also cause the car dashboard to not light up;

3. If the power supply fuse of the car dashboard is broken, there will naturally be no power supply, and the dashboard will not light up.

Precautions in the use of the car dashboard:

1. When the indicator light is on, the odometer should be observed immediately, if the cumulative mileage reaches or exceeds l00,000km, the timing toothed belt must be replaced, otherwise the timing toothed belt may break, so that the engine can not work normally.

2. After replacing the new timing toothed belt, it is necessary to open the rubber plug outside the reset switch on the mileage dial, and press the reset switch inside with a small round bar to extinguish the indicator light of the timing toothed belt.

3. After replacing the new timing toothed belt, remove the odometer and adjust all the readings on the odometer to the 0 position.

It's yellow or red, and red should be called for maintenance and trailer to repair it immediately.

If the engine fault light is on, there is no abnormal noise in the cabin, there is no other abnormal prompt in the instrument, the vehicle power is not affected, and the gearbox upshift is not affected, you can continue to drive to the repair shop for further investigation.

There are many reasons why the engine fault warning light is on, which may be the poor combustion state in the cylinder, engine knocking (the engine combustion is abnormal, the pressure curve appears high-frequency, large fluctuations, and will break through the cylinder block in serious cases), carbon deposits inside the engine, etc.

1. Sensor failure; 2. The quality of gasoline is not up to standard; 3. The air leakage of the inlet pipe leads to the mixture being too thin; 4. The fuel pressure is low, and the injector and fuel filter are blocked; 5. The signal of the pressure sensor and the throttle position sensor is abnormal; 6. The ignition timing is inaccurate and the ignition is too late. 7. Weak high-voltage sparks due to poor spark plugs, igniters or high-voltage wires; 8. The throttle is dirty; 9. The exhaust gas recirculation system works poorly; 10. The exhaust pipe is blocked; 11. The cylinder pressure is low; 12. Turbocharging system failure 13. Clutch three-piece set 14 Air filter blockage, piston ring break or stuck, poor valve sealing, late ignition time, carburetor mechanical failure, air intake pipe leakage, individual cylinders do not work well or do not work, etc. However, some of the engine power is insufficient, and some of them can be solved by use. Such as:

General wear of the cylinder, poor flow of the carburetor oil passage, etc. When the user reflects the lack of engine power and burns oil, we should first judge the cause of insufficient power, after excluding the air filter blockage, the carburetor throttle can not be fully opened, the ignition timing is not good, the sealing gasket of the intake pipeline is damaged, the individual cylinder does not work or does not work well, etc., and then judge the working condition of the carburetor according to whether the engine fuel consumption is too high. Such faults must be repaired as required. Finally, we have to judge the wear and tear of the engine cylinders.

Engine wear directly affects the tightness of the cylinder; Therefore, checking the tightness of the cylinder can largely reflect the degree of wear of the cylinder, and the most convenient way to check the tightness of the cylinder is to use the cylinder pressure gauge to check the compression pressure of the cylinder.