The Mass Air Flow Sensor (MAFS) is installed in air intake line and is a hot-film type sensor. This sensor detects mass of air flow and sends the amount to the ECM by frequency signal. A large amount of intake air represents acceleration or high load conditions while a small amount of intake air represents deceleration or idle. By using this signal, the ECM can control EGR amount and fuel injection amount more correctly.
After replacing the Mass Air Flow Sensor (MAFS), MUST perform the "COMPONENT CHANGE ROUTINE" procedure (Refer to "REPLACEMENT" procedure). Otherwise trouble related with engine performance or emission control may occur until ECM learning about the component is over.
