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fuel level sensor high voltage
The fuel level sensor voltage is too high, and there is a problem with the sensor power supply voltage. The output voltage of the fuel temperature sensor is too high. Check the power supply voltage of the temperature sensor. The sensor is installed on the high-pressure main pipe to directly measure the fuel temperature flowing through the return pipe. The density and viscosity of the fuel change with the fuel temperature. If the internal components of the sensor are damaged, it will cause a short circuit. If the circuit is grounded, a loop will be formed, causing the sensor voltage to be too high. Related electrical components are damaged, resulting in high voltage.
It is recommended to check the circuit and the fuel position sensor. If the voltage of the oil level sensor is too high, there will be strong gas flowing in the engine, and the fault codes eliminated by the computer will continue to appear, so the voltage of the sensor is too high, and the fault can be solved only by replacing it with a new one.
The intake air temperature sensor is a negative temperature coefficient thermistor. The higher the temperature, the smaller the resistance, and the smaller the voltage in the voltage divider circuit. Therefore, the higher the temperature, the smaller the signal voltage. Unplug the plug of the intake air temperature sensor and measure whether the power supply voltage at the plug of the intake air temperature sensor is 5V. If it is lower than 5V, check whether the ECU end is falsely connected with the connector end, causing partial voltage; Measure the resistance value of the intake air temperature sensor. If the resistance value is abnormal.
Some cars that have been used for a long time may have problems with the oil float, which is what we usually call the oil level sensor. We can check whether the plug of the oil level sensor on the oil tank is loose, and observe whether the oil level sensor is stuck during the sliding process. It is recommended to connect the two oil float lines at the automobile maintenance center. If the pointer of the oil gauge reaches the top, it means that the oil float is broken. If the pointer does not move after just filling up the oil, it may be because the oil float is pushed above the fuel tank by the buoyancy of the oil. When the vehicle starts to consume fuel, the oil float drops and the pointer of the oil gauge rotates with the sensor.
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