Step by step guide on how an automotive mass air flow sensor (MAF) works.
- The mass air flow sensor is designed to
monitor the volume of air passing into the engine at any giving time (located
in the intake tube connected to the throttle body) this information
is then transmitted to the computer for calculations while helping adjust fuel injector
input and ignition timing settings.
Step 2 - All maf sensors include an electrical
connector which is used to transfer data to the computer.
Mass Air Flow Sensor (Appearance will vary.)
Step 3 - A hot wire is used to detect air flow
by measuring the resistance change as varying amounts of air are passed over it.
Mass Air Flow Electrical Connector
Step 4 - Sensor wiring diagrams are used to
help troubleshoot electrical problems.
Mass Air Flow Hot Wire
A mass air flow sensor can become inaccurate after large amounts of air (high
mileage) has passed
over the hot wire and must be
normal operation will return. These sensors are delicate and are prone to failure,
is simple in most cases. Engine performance issues involving
this sensor include, hesitation, low power and poor mileage.
Article first published 2016-02-04