Knock Sensor: Testing and Inspection

The scan tool has four data displays available for diagnosing the Knock Sensor (KS) system; the four displays are described as follows:

^ "KS Activity" is used to monitor the input signal from the knock sensor. This counter will increment when knock is being detected.
^ "Knock Retard" is the indication of how much the PCM is retarding the spark.
^ "KS Minimum Learned Noise" indicates the minimum level that the PCM has detected on the noise channel while the noise level was being learned.
^ "KS Noise Channel" indicates the current voltage level being monitored on the noise channel.

DTCs P0325, P0326, and P0327 are designed to diagnose the KS module, the knock sensors, and related wiring, so problems encountered with the KS system should set a DTC. However, if no DTC was set but the KS system is suspect because detonation was the customer's complaint, refer to Detonation/Spark Knock in Symptoms. Testing and Inspection