autometer water temp gauge sensor

• 2023-08-25

The autometer water temp gauge sensor is a sensor that detects temperature. The function of the water temperature sensor: ① Measure the coolant temperature, used for cold starting, fan control, target idle speed calculation, etc. ② Used to detect the temperature of the coolant and serve as a correction signal for fuel injection Provide a water temperature signal to the water temperature gauge to facilitate real-time understanding of the engine water temperature status. 

The detection method of the autometer water temp gauge sensor : ① Check the power supply voltage, unplug the plug, and use the two probes of a multimeter to check whether the voltage between the two wires is about 5V of the reference voltage. ② Read the data stream, and the normal water temperature signal is generally around 95 ℃. If an abnormal water temperature sensor signal is detected, maintenance should be carried out Detecting resistance can heat the water temperature sensor and then measure its resistance value . 

If the car is difficult to start, press the accelerator pedal to the bottom and connect the starter multiple times before starting the engine; Unstable idle speed , similar to cylinder shortage and misfire faults; Difficulty accelerating, stepping on the accelerator pedal to accelerate, unable to increase the speed, and emitting black smoke and a "sudden" sound from the muffler . The fault indicator light is on.

Maintenance process: It is estimated that the fault is caused by excessive mixture , cylinder shortage, or misfire . Firstly , perform a routine inspection: start the engine and use the "fire test" method to check the operation of each cylinder . The result is that all four cylinders are working . When starting, due to the fact that the water temperature signal obtained by the Electronic Control Module (ECM) is a cold vehicle signal, the amount of fuel injected is increased to facilitate starting. As a result, due to the imbalance of the air fuel ratio, the spark plug was soaked in fuel, making it difficult for the engine to start; After starting, a large amount of carbon deposits form on the spark plug, causing a misfire fault, which in turn affects the idle running and acceleration performance of the engine. After replacing with 4 new spark plugs and a autometer water temp gauge sensor , the engine starts smoothly, with good idle and acceleration performance.