Mass Air Flow Sensor: Description

Fig 1: MASS AIR FLOW SENSOR

Courtesy of DAIMLERCHRYSLER CORP.

1 - AIR CLEANER COVER

2 - MAF SENSOR

The Mass Air Flow (MAF) Sensor is located on the air cleaner cover. The MAF sensor uses semiconductor technology throughout, and is used to calculate the air mass flowing past it per time unit. This mass is important for determining the exhaust gas recirculation rate. The MAF sensor sends a corresponding signal to the ECM, which evaluates the signal to adjust the EGR air flow control valve. See Fig 1.