Air Flow Meter/Sensor: Description and Operation

Mass Airflow Sensor & Intake Air Temperature Sensor

The Mass Airflow Sensor is a combined Mass Airflow sensor and Intake Air Temperature sensor.

Mass Airflow Sensor Description
The Mass Airflow Interface consists of 1 analogue voltage input signal for Air Flow, a reference supply (5 V) voltage and ground reference voltage.

There are four Mass Airflow sensor diagnostic checks, a fault is detected if:-
1. The mass airflow signal exceeds a minimum threshold.
2. The mass airflow signal exceeds a maximum threshold.
3. The actual airflow is greater than the calculated airflow derived from the throttle position.
4. The actual airflow is less than the calculated airflow derived from the throttle position.