Heavy Duty Equipment Technician Red Seal Exam Prep · Question
What type of sensor uses a thin wire heated by an electric current to measure the mass flow rate of air entering an engine?
A Mass Air Flow (MAF) sensor typically uses a hot wire to measure the amount of air entering the engine. The engine control unit (ECU) uses this information to
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Question: What type of sensor uses a thin wire heated by an electric current to measure the mass flow rate of air entering an engine?
Answer options:
- Manifold Absolute Pressure (MAP) sensor
- Engine Coolant Temperature (ECT) sensor
- Intake Air Temperature (IAT) sensor ✅ Mass Air Flow (MAF) sensor
Correct answer: Mass Air Flow (MAF) sensor
Explanation: A Mass Air Flow (MAF) sensor typically uses a hot wire to measure the amount of air entering the engine. The engine control unit (ECU) uses this information to determine the correct fuel-to-air ratio.
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