Operation CHARM: Car repair manuals for everyone.

Knock Retard

Scan tool displays 0.0-25.5 degrees. Indicates the amount of spark the PCM is removing from IC spark advance in response to the signal from the knock sensors. The traction control system Desired Torque signal from the EBTCM may cause knock Retard to display a value more than 0.0 degrees if the traction control is active.