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subaru fuel level sensor circuit low input gauge stuck on empty
P1402 fault code, applicable to Subaru, means Fuel Level Sensor Circuit Malfunction.
Prompt: quickly search for fault codes. You can follow the "Driving" official account and reply to the fault code, such as "P1402", to obtain the corresponding fault code explanation and solution. Background knowledge: The fuel level sensor transmits the fuel level in the fuel tank to the electronic control module in the form of an electrical signal using the principle of a buoy and a variable resistor in the fuel tank.
When your car is troubleshooting, you need to clear the fault code. When clearing the code, be sure to follow the fault code clearing method specified for the specified vehicle model, and do not remove the negative grounding wire of the battery randomly to clear the fault code. Otherwise, the following two abnormalities may occur: first, the control computers of some models will lose their "historical records". I believe you all know that many models of automotive computers have the function of automatic memory. After removing the negative battery grounding wire, the engine operation data stored in RAM (random access memory) will be automatically cleared, As a result, your car will not perform well for a long time after maintenance, or the previous fault code will appear again soon after driving; Second, it will also cause the loss of some functions, such as the audio lock function, which is often lost. At this time, it is necessary to decrypt the audio system through a very troublesome repair procedure to restore the original function of the audio system.
Subaru fuel level sensor circuit low input gauge stuck on empty:First save the data when the fault reappears, and then clear the fault code. After clearing the fault code, the fault lamp does not light up at that time, but will light up again later. It can be seen from the data flow from the time when the fault lamp is off to the time when it is lit again that the fault lamp does not light up when the resistance of the oil level sensor is 4 Ω; When the resistance of the oil level sensor reaches 102.4 Ω, the fault lamp will light up. Another phenomenon is that when the resistance of the oil level sensor is 4 Ω, the oil gauge indicates full oil; When the resistance of the oil level sensor is 102.4 Ω, the fuel gauge indicates the lowest oil level, and the oil level warning lamp is also on. Troubleshooting: The cause is found. Next, pump out all the gasoline, clean the fuel tank and replace the gasoline, and then replace the main and auxiliary fuel level sensors. After the maintenance, the test run is completed, and the fault light is no longer on. So far, the fault has been completely eliminated.
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