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bug fuel level gauge ohms
1. The problem of the fuel meter itself. The failure of the fuel gauge itself will cause the fuel gauge to not move or be inaccurate. It can be judged that the pointer of the fuel gauge does not deflect for about half a minute after the ignition switch is turned on, or the pointer swings randomly and the fuel gauge pointer is inaccurate. , indicating that the fuel gauge is faulty;
2. Sensor failure. When the sensor fails, it will also cause the fuel gauge to be immobile or inaccurate. The judgment method is to clamp the multimeter pen to the two wiring posts of the variable resistor of the fuel sensor, and use the R×1Ω gear to detect the variable resistor. resistance value of the device. If the result shows that it does not meet the standard, the sensor is faulty;
3.The instrument cfuel is short-circuited. The short circuit of the instrument cfuel will also cause inaccurate problems in the fuel gauge. The simple way to judge is to use a multimeter to measure the voltage.
Check the line from the fuel level sensor to the ECU.
1.If there is an open circuit or false connection in the line, the fuel gauge will not display or the display will be inaccurate. In this case, the line should be repaired;
2.Check the fuel position sensor sliding resistor for poor contact or Severe wear and tear will output wrong signals, resulting in inaccurate fuel gauge. Replacing the fuel level sensor can solve the problem;
3. Abnormal instrument circuit or aging of electrical components will also cause abnormal fuel gauge indication. After judging that the instrument is faulty, only Replace the instrument to solve the problem;
4. The fuel level sensor is fixed on the fuel pump bracket. If the fuel gauge is inaccurate due to the deformation of the fuel tank or the bracket is abnormal, you can only check it by removing the fuel pump when encountering such failures;
5. The fuel level sensor sends the fuel level to the instrument through the engine module Signal, if there is a virtual connection, open circuit or short circuit inside the engine module, the fuel level sensor signal cannot be transmitted to the instrument, resulting in the instrument not displaying the fuel level. In this case, you can use a diagnostic instrument to help you judge;
6. The wiring harness on the car shares a grounding point. Sometimes in order to make the data more accurate for a certain electrical equipment, an additional grounding line is added. If the grounding line of the fuel level sensor and fuel pump harness on the car is loose, the fuel level will also be inaccurate. In this case, you can fix all the ground wires on the car to troubleshoot.
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