Circuit Description

Knock sensor is used to detect engine detonation. Knock sensor produces and sends an AC voltage signal to the PCM to identify engine knock being detected. PCM will retard timing based on this signal. PCM may reject a signal that appears to be a false signal. If PCM still detects a high noise level, DTC P0327 will be set.

Conditions required to set DTC are:

• Engine speed is greater than 2000 RPM.
• Abnormal noise level sensed for 8 seconds of 10-second period.