Air Flow Sensor Terminal Identification First Design Sensor

Vb

Voltage Battery

Battery voltage supply to sensor

Vc

Voltage Constant

ECU constant reference voltage

Vs

Voltage Signal

Signal voltage representing air flow

E2

Earth Ground

Sensor ground return path

The air flow meter and ECU are wired as shown in the diagram. Signal characteristics are depicted by the accompanying graph. The use of battery voltage, VB, as a sensor input necessitates the use of the Vc terminal as a constant reference signal for the ECU. This is because battery voltage may change with variances in electrical load and ambient temperatures. Without the use of a constant reference voltage, these changes would cause a change in the Vs signal value recognized by the ECU.

Www Toyota Carina Airflow Sensor
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