Toyota 2.4L/22RE Air Flow Meter (AFM)

Visitor # 24822 since 18.MAY.2002

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Introduction

The Toyota 22R-E engine is electronically fuel injected. As such they lack a mechanical carburetor and instead split the function of the carburetor into three parts, namely the Air Flow Meter in the air cleaner box, the throttle body and the fuel injector. The air flow meter uses a flapper vane and temperature sensor to detect the amount and temperature of the incoming air flow. The throttle body controls the air flow into the engine and the fuel injectors supply the proper amount of fuel to each piston depending upon operating conditions.

While this information is based upon the AFM system in the 22R-E engine, most of it applies to other Toyota EFI engines. For specific information, be sure to consult the service manual for your model engine. On the 22RE engine, the AFM is located atop the air filter box. In a stock engine compartment, this is in the driver's side front corner. In the image below, the AFM is dead center in the image:

Air Flow Meter location
Air Flow Meter location

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Throttle Position Sensor:

AFM Testing:

The AFM is not designed to be adjusted, so it either works or doesn't work.