How does air fuel sensor work?
An ordinary O2 sensor produces a voltage signal of 0.8 to 0.9 volts when the air/fuel mixture is rich, then drops to 0.3 volts or less when the air/fuel mixture goes lean. The WRAF sensor signal starts out low and gradually increases its output as the air/fuel ratio gets progressively leaner.
Is the air fuel ratio sensor important?
An air-fuel ratio sensor is one of the key components found on many modern engine management systems. As the air-fuel ratio sensors plays a direct role in the adjustment and tuning of the engine, they are very important to the overall operation and efficiency of the engine and should be inspected if problems arise.
Where is the air fuel ratio sensor located?
Most vehicles will have more than one air-fuel ratio sensor. They are mounted in the exhaust system before and after the catalytic converter. The air-fuel ratio sensors continuously monitor the air-fuel ratio of the vehicle’s exhaust and send a precise signal to the engine computer…
What’s the difference between an air fuel sensor and an oxygen sensor?
The Difference Between Air Fuel Sensor and Oxygen Sensor. There are different types of oxygen sensors, but two of the more common types are: • the narrow range oxygen sensor, the oldest style, simply called the oxygen sensor. • wide range oxygen sensor, the newest style, called the air/fuel ratio (A/F) sensor.
What is the current flow of the A / F sensor?
The A/F sensor is designed so that at stoichiometry, there is no current flow and the voltage put out by the detection circuit is 3.3 volts. A rich mixture, which leaves very little oxygen in the exhaust stream, produces a negative current flow. The detection circuit will produce a voltage below 3.3 volts.
What are the parts numbers on a Toyota fuel sensor?
All Toyota air/fuel sensor part numbers start with the prefix “89467”; OE oxygen sensors, in contrast, start with prefix “89465.” In the case of any of these DTCs, once you’ve ruled out heater malfunctions (be sure to check for pending heater codes) and incorrect parts, it’s time to dig in for more detailed diagnostics.
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