how to fix a tachometer

• 2022-04-02

For example, the common fault of engine tachometer is that it doesn't work. The reason is that there is a fault in the circuit or instrument itself. The inspection method of the engine tachometer is as follows: (1) check whether the "-" terminal of the ignition coil is in good contact; (2) check whether the black three hole socket behind the tachometer is in good contact; 3) check the working condition of the three hole socket with a multimeter. If the a socket is poorly grounded, check whether the brown wire in the white 14 hole socket of the instrument harness connector is grounded; If the B socket has no voltage when the ignition switch is turned to "on", check whether the black wire in the black 14 hole socket of the instrument harness connector has power supply voltage; If the C socket has no voltage when the ignition switch is turned to "n", check whether the red / black wire in the white 14 hole socket of the instrument harness connector is in good contact with the ignition coil - "terminal". If the black three hole socket harness behind the tachometer is normal after inspection, the fault is the tachometer itself, and the tachometer should be replaced.

It should be caused by a problem with the speed sensor. It is recommended to clean or replace the speed sensor to see if it works. The direct cause refers to the dirty, worn and incorrect installation of mechanical parts, resulting in the change of individual cylinder power, resulting in the imbalance of cylinder power and unstable idle speed of the engine; Indirect causes refer to the abnormal electronic control system of the engine, resulting in poor combustion of the mixture, making it difficult to balance the power of each cylinder, resulting in unstable idle speed of the engine.

First of all, you should confirm whether you haven't had maintenance for a long time. If you haven't had maintenance for a long time, you just need to go to the 4S store and repair shop for minor maintenance and replace the spark plug and fuel filter. These are common replacement items for minor maintenance.If the problem has not been solved after maintenance, it is necessary to consider whether it is the problem of the fuel system. It may be that the fuel injector is blocked, or the fuel injector is unclean or worn. Imagine a water pipe that is discharging water. If the outlet is blocked, the whole water pipe will shake. Similarly, if the fuel injector is blocked, the whole vehicle will shake naturally, At this time, it is necessary to check and replace the fuel injector and injector.