ASE Automobile Service Consultant Certification (C1) 2025 – 400 Free Practice Questions to Pass the Exam

The crankshaft sensor is crucial for engine speed data transmission as it measures the rotational speed of the crankshaft. This information is vital for the engine control module (ECM) to manage fuel injection, ignition timing, and overall engine performance. The crankshaft sensor communicates the engine's RPM, which helps in various operational adjustments to optimize engine efficiency and power output.

The other sensors play important roles but are not primarily responsible for relaying engine speed data. The throttle position sensor monitors the position of the throttle plate and assists in determining the required fuel-air mixture, while the mass airflow sensor measures the amount of air entering the engine to optimize fuel delivery. The oxygen sensor, on the other hand, monitors the level of oxygen in the exhaust gases and is primarily used for emissions control and fuel mixture adjustments. Hence, the crankshaft sensor is the key component directly associated with engine speed data transmission.