Electronic Ignition Timing Retard

Knock sensor is located at right rear of engine in cylinder block near water pump. Knock sensor sends a variable AC voltage signal to PCM depending on engine detonation. PCM uses this signal to determine if ignition timing should be retarded. If a fault occurs in knock sensor circuit or knock sensor fails, DTC 52 will set in PCM memory. For testing procedures, see TESTS W/CODES - 1.8L article.