Mass Air Flow Sensor (MAFS)

MASS AIR FLOW SENSOR (MAFS)




DESCRIPTION
The Mass Air Flow Sensor (MAFS) is located between the air cleaner assembly and the throttle body. The MAFS uses a hot film type sensing element to measure the mass of intake air entering the engine. Mass air flow rate is measured by detecting of heat transfer from a hot film probe. The change in air flow rate causes change in the amount of heat being transferred from the hot film probe surface to the air. A large amount of intake air represents acceleration or high load conditions while a small amount of Intake air represents deceleration or idle. The ECM uses this information to determine the injection duration and ignition timing for the desired air/fuel ratio.

Circuit Diagram:

CIRCUIT DIAGRAM

Waveform:

WAVEFORM

HARNESS INSPECTION
Refer to DTC P0102 and P0103 troubleshooting procedures.

SENSOR INSPECTION
1. Run the engine and connect Hi-Scan (Pro) to data link connector.




2. Check if sensor output is normal using Hi-Scan (Pro).