Still worrying about how to check the fault car?

After reading this article patiently! I believe you will have new gains!

1、Ask users，Time of the failure、Phenomenon、The situation at that time，The cause of the failure and whether it is overhaul、Disassembling, etc.。

3. Call out the fault code and find out the content of the fault.

4、Failure range displayed by the fault seabet appcode，Maintenance，Pay special attention to whether the joint is loose、Show off，Whether the wire connection is correct。

6、If there is no failure code，or can not find the failure content after calling，According to the fault phenomenon，Roughly judge the range of fault，Methods to check the performance of the component one by one to rule out。

1） Check the battery voltage.

2） Check whether the battery pole column and wire connection are loose.

3） Check the startup system，Including ignition switch、Starting switch、Veter starting switch and starting motor situation，Whether the lines are connected to loose。

1） Call out the fault code.

2） Check the fuel pump work.

3） Check whether the idle speed system works normally (if the idling system work is abnormal，The engine can start when stepping down the acceleration pedal)。

4） Check the ignition system，Including high -pressure sparks、ignition the right time、Spark plug, etc.。

6） Check whether the air flow meter or the air pressure sensor is poor。

7） Check whether the fuel injector and the low -temperature startup injector work normally.

8） Check the EFI system circuit，Including ECU connector -related terminals。

1） Call out the fault code to analyze the cause of the fault.

2） Check the air leakage of the air intake system.

3） Check the working conditions of the PCV valve of the ventilation pipe of the crankshaft box (when idling，PCV valve should be closed)。

4） Check whether the idle adjustment screw on the valve is adjusted correctly，If the adjustment screw adjustment is incorrect，It will cause too thin gas at idle，Lead the engine's idleness instability。

6） Check the injection of the injector.

7） Check the work of EFI system circuits and components.

8） Check the condition of the mechanical system.

1） Check whether the valve issues a card and cannot be closed.

2） Check whether the cold startup injector is continuing fuel injection.

3） Check whether the output voltage is incorrect.

5） Check whether the vacuum sensor hose of the regulator falls off or breaks.

1） Check whether the idling control system and the VSV valve work normally.

3） Call out the fault code to determine the cause of the fault.

4） Working of EFI system circuits and components.

10) Check whether the ignition is incorrect.

1） Call out the fault code to analyze the cause of the fault.

2） Check the air leakage of the air intake system.

3） Check the fuel pump fuel supply，Is the pressure on the fuel pipeline normal。

5） Check the injection of the injector，Whether the individual fuel injector does not work or the amount of fuel injection is inaccurate。

6） Check the ignition system，If you ignite the right time、High -pressure spark situation、Spark plug charcoal accumulation, etc.。

8） Check whether the filter element of the gasoline filter is blocked.

9） Working of EFI system circuits and components.

10) Check the mechanical part，such as cylinder pressure、Valley gap, etc.。

The engine recovery phenomenon is mostly caused by the mixing gas or too late for the ignition time。

2） Check the air leakage of the air intake pipe.

3） Check whether the output signal of the location sensor output of the throne is correct.

5） Check whether the fuel pressure is too low.

6） Check whether the fuel injection time is too short.

7） Check whether the injector is blocked.

8） Check the work of the EFI system circuit and component，There are mainly related sensors，such as oxygen sensor、Water temperature sensor、Inlet temperature sensor、Inlet pipe pressure sensor, etc.。

The phenomenon of exhaust pipe artillery is mainly due to too much mixed gas、Individual cylinder does not work and burning time incorrect combustion factors are caused by incomplete burning factors。

2） Check whether the ignition time is too late.

3） Check whether the cold startup injector is still injecting or dripping，and further find out the reason。

5） Individual cylinder spark plugs do not ignite or spark too weak.

6） Check the fuel injector，Whether there is excessive fuel injection，or some cylinder fuel injection phenomenon，Whether there is a drip。

7） Check whether the fuel pressure is too high，Whether the pressure regulator fails, causing the oil return pipeline to be unable to open the oil return，Whether the vacuum sensor hose of the pressure regulator fall off or breaks。

8） Check whether the output signal of the output signal of the air flow meter and the throttle position sensor is correct。

9） Check the work of the EFI circuit and related sensors.

1） Check whether the air pipe is leaked.

2） Check whether the ignition time is too late.

3） Call out the fault code to analyze the cause of the fault.

1） Check the fuel injection system，Such fuel pressure、The working conditions of the fuel injector。

2） Check the ignition system，Especially whether the work of the shock sensor and the igniter is normal。

4） Check the working situation of EFI circuits and fuel injection components。

5） Check the pressure of the cylinder、Valley gap、Spark plug work and gas distribution as a project。

Generally speaking，ECU is more reliable，It is not easy to fail，Under normal use，The failure rate of 100,000 kilometers is not higher than one thousandths，But when the engine working time is too long (the mileage is more than 150,000 kilometers)，The failure rate of ECU increases significantly，The cause of the fault is mainly:

2） Capacitor elements fail;

3） Integrated block damage;

4） Electric control unit fixing foot bolts loose;

5） Electronic components are damaged.

ECU Once a failure，It will cause the engine to be unable to start or it is difficult to start、No high speed、Great fuel consumption and other phenomena。

Vehicle sensors are generally divided into armistor resistance、vacuum pressure formula、Several kinds of mechanical transmission and voltage types，Relatively speaking，Sensor is prone to failure in the electronic control gasoline jet system，The cause of the fault is mainly:

2） Vacuum membrane damage;

3） Dordrop or ablation of the contact site;

4） Metropolitan line failure, etc.

The sensor is responsible for providing an engine work to the ECU，So，When a general failure occurs，It will directly affect the source of the accurate information of ECU，Control of the engine will also be out of control or abnormal control。

Electric -controlled gasoline injection system has many connecting parts，Because it works in a vibration、Multi -dust、High temperature、In the environment of Yichao，Time a long，It is easy to cause failure。The main reason for the failure is caused by bad environment:

2） Connect loosen;

3） Poor contacts.

When a connection connector is faulty，Unstable engine work，Good or bad time，Generally can be diagnosed with fault signs simulation test method。

Injector and cold startup injector are one of the easily damaged parts，Especially due to the relatively poor domestic gasoline oil，More prone to blockage and stuck death。Under normal circumstances，The fuel injector should be cleaned at least once a year。The failure of the fuel injector is mainly manifested in:

2） The fuel injection mouth is dead;

3） Cover;

4） Drop;

5） The atomization condition is not good;

6） peripheral circuit.

The failure of the injector will mainly cause the engine to do not work seabet loginor work badly。Another，Each cylinder injector injector is too large (15 seconds exceeds 8 ~ 10ml)，It will also cause failure such as the unstable work of the engine。

Electric control gasoline injection system has a large number of vacuum pipes and other pipes，Since most of them are rubber products，Heat、A long time with oil and time，will produce aging。The fault is mainly manifested in:

2） Pipe mouth rupture;

3） Card is not stuck;

4） The interface is loose.

Its final manifestations are leakage，Make the mixture too thin、The engine starts difficulty or poor idle、Accelerate weakness, etc.。

The fuel pressure regulator is used to adjust the fuel injection pressure，When a failure, it will significantly affect the oil supply of the engine，Make the engine from supplying oil、Starting difficulties、Accelerate weakness, etc.。Channel blockage and pressure regulator diaphragm damage，Will cause fuel pressure regulator failure。

Air Filter、The blockage of the gasoline filter and the oil filter will cause engine failure，Therefore, it should be maintained regularly，Maintenance and replacement if necessary。(The content of the article comes from the Internet，If you involve copyright, please contact delete。)