Technician A says that in a fuel injection system, the MAF sensors may be vane-type, heated grid-type, or hot wire-type. Technician B says that the PCM supplies a richer air-fuel ratio when it gets a signal that current flow is increasing to maintain temperature in the MAF module. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Question

Quizplus · Accepted Answer

Both technicians are correct. Technician A is correct in stating that MAF (Mass Air Flow) sensors can be of different types, including vane-type, heated grid-type, or hot wire-type. Technician B is correct in stating that the PCM (Powertrain Control Module) enriches the air-fuel mixture in response to increased current flow in the MAF sensor to maintain its temperature, which is a characteristic of how hot wire MAF sensors function.

Technician a Says That in a Fuel Injection System, the MAF