Causes of failure of electronically controlled engine failure and troubleshooting methods

1. The electronic control system cannot be powered on.

Reasons:1The diagnostics could not be connected2Water temperature sensor without 5V voltage 3Gauge speed display ERR4

Maintenance suggestion: Check whether the electronic control wiring harness is damaged and the plugging is not secure. 1.Ignition switch K12 wire (+24V).

2.ECU mains power positive VA (+24V)3The main relay fails. 4.Harness fuse burned out 5ECU Internal Fault 6Faults within the meter.

Second, the battery voltage is insufficient;

Reasons:1Multimeter.

or the diagnostic instrument detects that the battery voltage is insufficient (lower than the required starting voltage), 2The starter drags weakly.

Repair recommendation: Replace the battery or recharge.

3. Unable to establish work schedules.

Reasons:1The diagnostic instrument detects the cylinder variable (1 is normal at start-up); 2.Oscillograph.

Displays the camshaft.

The working phase with the crankshaft is incorrect.

Repair suggestions:1Check whether the crankshaft and camshaft sensors are intact and undamaged.

2.Check the connectors.

and whether the wire is in good condition.

3.Check if the mechanical phase is offset.

4.Check the crankshaft camshaft signal disc for contamination and deformation.

Fourth, the reason: there is air in the oil circuit, and the engine has not been used for a long time.

Repair suggestions:1Unscrew the oil return bolt at the rear end of the single pump, press the hand oil pump until diesel fuel comes out, and tighten the bolt.

2.Unscrew the connecting nuts of any two cylinders of high-pressure oil pipe to the injector (high-pressure connecting pipe).

Drag the engine for about 10s until there are no bubbles at the high-pressure oil pipe, tighten the high-pressure oil line, and try to start the engine again.

Cause: Mechanical Failure:

1.The oil circuit is not smooth, and the inlet pressure of the oil pump is not good.

2.Starter motor damaged:

3.Excessive resistance and lack of oil.

4.intake and exhaust valve adjustment errors, etc.

Repair Recommendations:

Hello. First of all, check whether the car's "starting system" is faulty. If the starting system is faulty, the car will definitely not start.

Secondly, if the starter can drive the normal operation of the engine, it means that the engine is faulty, and the reason for not getting on the car is mainly in two aspects

1. The problem of fuel supply;

2. Ignition problems. (Of course, in addition, it also includes, for example, the exhaust pipe is blocked, etc., these faults are too trivial to be reflected).

Next, let's analyze the fuel supply problem:

1. Sensor failure: including crankshaft position sensor and camshaft position sensor.

2. Controller failure: including computer and control circuit.

3. Actuator failure: including the failure of the injector itself, the failure of the oil pump, the failure of the oil pressure regulator, etc.

Ignition system failure:

1. Sensor: crankshaft and camshaft sensor failure.

2. Controller failure: computer and ignition module failure.

3. Actuator failure: ignition coil, cylinder wire, spark plug and other failures.

Note: The premise of checking the above faults is to ensure that the above systems have normal power supply and tie-off.

The biggest difference between an electronically controlled engine and a carburetor engine is the fuel supply system. The fuel supply system of the electronically controlled engine has eliminated the carburetor, but a number of electronic automatic control devices have been added. These include many sensors, actuators, and ECUs.

Electronically controlled engines have to do not only what carburetors do, but also what carburetors can't do. For example, the specific concentration of air-fuel in a combustible mixture can be controlled within the required range. The oil circuit and circuit of the carburetor engine are very clearly divided and do not affect each other much.

The electronically controlled engine fuel supply system increases the electronic control part, which makes the oil circuit and circuit interconnected, which not only affects the work of the engine fuel system, but also affects the normal operation of the engine. Due to the increase in electronic control devices for electronically controlled engines, this makes the entire structure of the engine, including the electronic control system, more complex.

Fast. Navigation.

Structural composition. How it works.

Parameters to be measured. Merit.

Basic idea. In the initial stage, the function of the system is realized by replacing the mechanical control technology with electronic technology, and its function is expanded, so that the performance is greatly improved; After the development to a certain extent, electronic technology can promote the essential change of the system principle, so that the limitations can be broken through, so that the engine performance can be greatly improved.

Electronically controlled engine.

Structural composition. Electronic control unit.

The electronic control unit (ECU) is the heart of the engine's electronic control system. It completes the collection of various parameters of the engine, the control of fuel injection volume and fuel injection timing, and determines the function of the entire electronic control system.

Sensor. Sensors transmit information about engine conditions and environment to the ECU in real time and realistically through various signals.

In other words, what the ECU learns is just an engine made up of many signals. Therefore, the accuracy, reproducibility and immediacy of sensor information directly determine the quality of control.

Actuators. The various control functions to be completed by the electronic control system are realized by various actuators.

In the control process, the actuator converts the control signal from the ECU into a certain mechanical motion or electrical movement, thereby causing the change of engine operating parameters and completing the control function.

How it works. The engine speed and load are used as the basic signals reflecting the actual working conditions of the engine, and the basic fuel injection amount and fuel injection timing are determined with reference to the fuel injection amount and fuel injection timing spectrum corresponding to each working condition of the engine obtained by the test, and then various compensation is made according to various factors (such as water temperature, oil temperature, atmospheric pressure, etc.), so as to obtain the best fuel injection amount and fuel injection timing or ignition timing, and then control the output through the actuator.

There are many reasons why the electronically controlled engine cannot start, such as the ignition system, fuel supply system, or anti-theft system, which will affect the car from starting, mainly the motor of the starting system, or the timing.

First of all, BAI needs to check whether the "startup system" of the car has a DAO failure. If the starting system is faulty, the car will definitely not start. Secondly, if the starter can drive the normal operation of the engine, it means that the engine is faulty, and the reason for not getting on the car is mainly in two aspects

1. The problem of fuel supply; 2. Ignition problems. (Of course, in addition, it also includes such as blocked exhaust pipes, etc., these faults are too trivial to reflect) Next, analyze the fuel supply problem: 1. Sensor failure:

Including crankshaft position sensor, camshaft position sensor 2, controller failure: including computer and control circuit 3, actuator failure: including the failure of the injector itself, the failure of the oil pump, the failure of the oil pressure regulator, etc

1. Sensor: crankshaft and camshaft sensor failure 2. Controller failure: computer and ignition module failure 3. Actuator failure

Ignition coil, cylinder wire, spark plug and other faults Note: The premise of checking the above faults is to ensure that the above systems have normal power supply and tie-off.

Summary. Hello, dear, the car master for your service, attentive, careful, concentrate on answering your car questions, for you to find the corresponding problem solutions and solutions, will provide you with a satisfactory answer! We hope you find this answer helpful.

Hello friends, the electronic control system is generally throttle failure, ignition coil failure, crankshaft position sensor, camshaft position, the fault maintenance method of these electronic components is basically the dashboard will light up the fault light, and then use the computer to detect, report the relevant fault code, such as camshaft and crankshaft position, sensor signal deviation or mixture is too thick and the mixture is too thin, the above situation is accompanied by the performance of the start of the effort, acceleration powerlessness and frustration, etc., and then need to be combined with the computer to read the data stream for maintenance, Cleaning and replacing the sensor can be solved.

Hello, dear, the car master for your service, close the manuscript attentively, carefully, concentrate on answering your car questions, for you to find the corresponding problem solutions and solutions, will provide you with a satisfactory answer! We hope you find this answer helpful. Hello friends, the electronic control system is generally throttle failure, ignition coil failure, crankshaft position sensor, camshaft position, the fault maintenance of these electronic components is basically the dashboard will light up the fault light, and then use the computer to detect, report the relevant fault code, such as camshaft and crankshaft position, sensor signal deviation or mixture is too thick and the mixture is too thin, the above situation is accompanied by the performance of the start is laborious, acceleration powerless frustration and other related to the performance, and then need to be combined with the computer to read the data stream for maintenance, Cleaning and changing the sensor can solve the car.

Is there any more detail?

In detail, what kind of faults should you target for the code seepage? Because there are many models of vehicle breakdowns, and there are many kinds of Mingchong, there is no consistency in this, and it can only be a single case.

For example, throttle failure, ignition coil failure, crankshaft position sensor failure, camshaft position sensor failure, for these points.

Throttle failure is usually reported, the throttle angle signal is wrong, but the computer reads the data flow after the stool, and the accelerator pedal data flow has no mutual change.

Summary. After the air flow meter detects the current air quality, it is fed back to the engine computer board, and then the engine computer board gives a reasonable fuel injection signal, after the engine is completed, the exhaust gas is monitored by the front oxygen sensor, and the current mixture is too thick or too thin Then this signal is fed back to the computer board, and the fuel is corrected in real time. The rear oxygen sensor is mainly used for monitoring.

The three-way catalytic filtration effect detects whether the sulfides and nitrogen oxides in it are completely filtered out.

The causes of the failure of the electronically controlled engine were analyzed, and the comprehensive fault diagnosis process and maintenance methods were discussed.

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Hello, if the electronically controlled engine can not be started, it should be overhauled from the following aspects, the first is whether the battery power and the power supply voltage between the actuators and the early calendar is normal, the second is whether the anti-theft system of the vehicle has been certified, and the third is whether there is a problem with the computer version and the actuator itself.

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The G70 is an air flow meter in this state. J220 is a computer board with a dry engine, G39 front oxygen sensor, G130 rear oxygen sensor, G28 fuel injector.

What about the effect. After the air flow meter detects the current air quality, the anti-scattered mountain feeds to the engine to take the bent computer board, and then the engine computer board gives a reasonable fuel injection signal, after the engine is completed, the exhaust gas is monitored by the front oxygen sensor, the current mixture is too thick or too thin Then this signal is fed back to the computer board, and the real-time correction of fuel is carried out here. The rear oxygen sensor is mainly used for monitoring.

The three-way catalytic filtration effect detects whether the sulfur smoldering and nitrogen oxides in it are completely filtered out.