Engine Performance (A8)Câu 101 / 120
A knock sensor allows the PCM to:
a.Measure exhaust oxygen
b.Detect detonation and retard ignition timing to protect the engine
c.Control the fuel pump
d.Read vehicle speed
Giải thích
The knock sensor detects the vibration of detonation so the PCM can retard timing and prevent engine damage. Persistent knock can come from low-octane fuel, carbon buildup, or overheating. A faulty sensor may cause reduced performance or a code.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
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Đội Ngũ Biên Tập PrepPass · Đối chiếu với ASE Automobile Certification Series (A1–A8) · Quy trình kiểm tra