autometer water temp gauge

• 2022-09-29

How do we know the water temperature of the autometer engine accurately? Although the instrument panel only tells us roughly whether the water temperature is abnormal, the engine must have an accurate water temperature signal to adjust the fuel injection and control the idle speed. Therefore, there are generally two water temperature sensors on the engine. One water temperature sensor signal is transmitted to the instrument panel to indicate whether the engine water temperature is abnormal. This signal is relatively rough. The other water temperature sensor signal is transmitted to the engine control unit as a correction signal to control the engine operation. This signal is very accurate. We can see this parameter very accurately by checking the engine operation data flow with the engine fault diagnosis instrument.

Someone may also say that the autometer water temp gauge is really useless. I just need to know whether the water temperature is normal. There is no need to know the specific water temperature. Besides, don't cars with water temperature gauges also have water temperature warning lights? In fact, you don't know that the water temperature is an important working parameter of the engine. The engine will adjust the fuel injection quantity according to the water temperature. Many old drivers will also adjust their driving behavior according to the engine water temperature to judge the engine working condition. For example, when the water temperature is low, the driver will drive gently as far as possible, not accelerate quickly, and not allow the engine speed to be too high, which can effectively avoid excessive wear of the engine at low temperatures (this is especially important for trucks). When the engine temperature reaches the normal operating temperature, it can run normally under heavy load. When the engine temperature is high, the engine load will be reduced, or the engine will stop for a rest to avoid the engine from boiling, etc.

Experienced drivers will also judge engine faults according to the autometer water temp gauge, predict the technical state of the engine in advance, and make corresponding treatment to avoid small faults turning into major ones. For example, if the engine water temperature always fails to reach the normal operating temperature or the temperature rises slowly, it may be that the thermostat is normally open, and the engine cold start time is too long, which will lead to increased engine wear and shorten the service life of the engine.