What is a purge flow sensor?
Definition. The PFS (Purge Flow Sensor) is usually found in the Evaporative fuel system, also called the charcoal canister, and located close to the fuel tank. The PCM uses the signal to determine how much fuel it will have to send into the engine, along with the fuel entering the intake manifold from the EVAP system.
What happens when the EVAP purge valve is unplugged?
It is possible that, if the high voltage disappears when the sensor is unplugged, the ground circuit is good, and the reference voltage is correct, that there is a blockage in an EVAP purge system hose. Disconnect the hoses from the EVAP purge valve and blow compressed air through them to make sure they are free-flowing.
Why does my VAF sensor have low input voltage?
Other possible causes of low input voltages include poor installation of aftermarket components, poor quality aftermarket components like fuses, relays, and switches, and modification of the electrical system that could include the use of conductors that are not rated for use in a particular application.
What should I do if my EVAP sensor is not working?
Wiggle test the connector at the EVAP pressure sensor. Continue monitoring the voltage on your scan tool for fluctuations. If the voltage fluctuates when you wiggle the connector, check the connector for broken or damaged pins. The connector may also be damaged inside.
Why does my battery have a low input code?
Note: Circuit Low Input codes are often the result of low battery voltages (that can have many possible causes), bad connections across electrical connectors or previously repaired wiring, as well as corrosion in electrical connectors.
How can I fix a flaw in my MAF sensor?
If so, a flaw in the MAF sensor must be fixed or the MAF must be replaced. Check for loose parts, frayed wires or broken components. Inspect for vacuum leaks. The MAF unit can be removed and cleaned, using recommended cleaning fluids like an aerosol brake parts cleaner.
It is possible that, if the high voltage disappears when the sensor is unplugged, the ground circuit is good, and the reference voltage is correct, that there is a blockage in an EVAP purge system hose. Disconnect the hoses from the EVAP purge valve and blow compressed air through them to make sure they are free-flowing.
Other possible causes of low input voltages include poor installation of aftermarket components, poor quality aftermarket components like fuses, relays, and switches, and modification of the electrical system that could include the use of conductors that are not rated for use in a particular application.
What does the low input MAF code mean?
The code points to low fuel consumption in the system, calling for a repair. First, drive the car around to reset the code. Plug the scanner in again and see if it recurs. If so, a flaw in the MAF sensor must be fixed or the MAF must be replaced. Check for loose parts, frayed wires or broken components. Inspect for vacuum leaks.