Knock Sensor: Testing and Inspection

SCAN TOOL TESTING
Use the following scan tool parameters when diagnosing the Knock Sensor (KS) circuit.

KS Noise Channel
This is used to monitor the input signal from the knock sensor. This position should display "YES" when knock is being detected and "NO" when no knock is being detected.

KS Retard
This indicates how many degrees the PCM is retarding the spark timing.

KS Active Cntr
This displays the AC signal from the knock sensor. The scan tool will display KS activity in counts. The higher the counts the more knock that is being detected.