If you cannot diagnose the cause of the engine failure, you should not attempt to open the engine cover. A quick diagnosis of the failure of the engine to start is the basis of vehicle maintenance. Now to understand how to use the appropriate diagnostic methods, follow the correct diagnostic procedures to diagnose the failure of the engine to start.
1, identify the cause of the failure For the engine can not start the diagnosis of such failures, first test the battery. It must be made clear that the engine cannot be started and the battery is not low.
2. Detection of ignition timing Timing belt slip phenomenon, is the root cause of no spark generated, the engine can not start this failure.
3. Detection Startup System For engines that cannot start such failures, the first thing to do is to test the circuits in the engine starting system. From the most basic form of composition, the starting system circuit generally includes the following most basic parts, namely the battery, the starting motor and the cable connecting these components. Of course, in addition, ignition switches, starter relays or electromagnetic coils, and on-board anti-theft systems are also an important part of the start-up system.
4. Detect spark quality When the circuit of the starting system passes the test and proves that there is indeed no fault, it should focus on why the engine cannot run. In general, the first test is the engine's ignition system, which is also the simplest test. In the early ignition system, you can easily remove the ignition coil and use an electric spark detector to check if the spark is normal. When selecting an EDM detector, an adjustable detector is preferable to a fixed design because it allows you to adjust the detector to a smaller gap so that you can see that there is no EDM at all Is there still an electric spark but it is weak?
5, Detection Fuel system Fuel system diagnosis 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 tested by measuring the fuel flow and pressure. The best way to measure the fuel flow rate is to detect the lines in the fuel supply line with the load. 6. Detecting the anti-theft system The on-board anti-theft system will also produce some frequently neglected fuel supply system failures. Some car manufacturers include parameter identification in the data flow of the anti-theft system. On many models, replacing the anti-theft system's module without properly initializing it can cause the car to fail to start. There are also some cars in certain circumstances, such as when the master key is lost, the multi-function controller needs to be replaced to allow the engine to start normally.
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