How to solve the problem of coolant sensor in the car?

Oxygen sensor, when the oxygen sensor fails, ECU can't get this information, and it doesn't know whether the amount of gasoline injected is correct. Improper air-fuel ratio will reduce engine power and increase emission pollution. Wheel speed sensor: mainly collects the rotating speed of the car and judges whether the car has signs of slipping. So there is a sensor specially used to collect the wheel speed of the car to complete this work, which is generally installed on the hub of each wheel. Once the sensor is damaged, ABS will fail; Water temperature sensor: when the water temperature sensor fails, the temperature signal of the hot car is often displayed when the cold car is started, and the ECU can't get the correct signal, which leads to the difficulty in starting the engine when the cold car is started, accompanied by unstable idle speed and insufficient acceleration power.

Electronic accelerator pedal position sensor, when the sensor fails, ECU can't measure the accelerator position signal and get the correct accelerator pedal position, and the engine can't accelerate or even accelerate; Intake pressure sensor: As the name implies, the intake pressure sensor senses a series of resistance and pressure changes caused by different engine speeds and loads, and converts them into voltage signals for ECU to correct fuel injection quantity and ignition timing angle. Generally installed near the throttle. If there is a fault, it will cause problems such as difficult ignition, unstable idle speed and weak acceleration.

The engine coolant temperature sensor is used to detect the coolant temperature and convert it into a temperature-related voltage signal, which is sent to the engine electronic control unit as the basis for the electronic control unit to correct the fuel injection quantity. If the coolant temperature sensor fails or fails, or the connection circuit between the coolant temperature sensor and ECU is short-circuited or open-circuited, or the surface is seriously fouled, the output signal will be greatly deviated, which will lead to the failure of the fuel injector to increase or decrease the fuel injection quantity in time, and finally lead to the difficulty in starting the EFI engine. Typical symptoms of circuit failure of coolant temperature sensor are: the engine is difficult to start cold, the idle speed is unstable, and the power is insufficient when accelerating.

When the engine is hot, the power of the engine is normal when starting, idling and accelerating; The engine fault indicator is always on. The reason is that in order to keep the engine running, the engine ECIJ performs a safety function when the engine does not get a normal signal from the coolant temperature sensor. At this time, the engine ECI. J. Take the coolant temperature replacement value stored in its memory (80 CLC? ~ 90) as the coolant temperature value. Therefore, when the engine is cold, the fuel injection quantity is controlled by ECI. The lack of J of the engine is related to the increase of low engine temperature, which leads to lean mixture and makes it difficult to start the engine.