What Causes a Fuel Sensor Malfunction?
1 Answers
Fuel gauge open circuit failure occurs when the vehicle's fuel level sensor malfunctions, and replacement is required. The causes of fuel gauge failure are as follows: 1. Fuel gauge issue: A malfunctioning fuel gauge can cause the gauge to remain stationary or become inaccurate. A diagnostic method is to observe if the fuel gauge needle does not move within approximately half a minute after turning on the ignition switch, or if the needle swings erratically or shows inaccurate measurements, indicating a fuel gauge fault. 2. Sensor malfunction: A faulty sensor can also cause the fuel gauge to remain stationary. The diagnostic method involves using a multimeter to measure the resistance of the variable resistor on the fuel sensor's two terminals using the R×1Ω range. If the result deviates from the standard value, the sensor is faulty. 3. Instrument coil short circuit: A short circuit in the instrument coil can also lead to fuel gauge issues. The diagnostic method involves measuring the voltage with a multimeter.