DTC P0332: Knock Sensor No. 2 Circuit - Low Input: Description

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The knock sensor 2 (bank 2) is a piezoelectric device that produces an AC voltage of different amplitude and frequency depending on the level of engine mechanical vibration. The ECM uses the sensor to determine if spark knock is occurring during a cylinder combustion event. If spark knock is detected, the ECM will retard timing on succeeding firing cylinders until the spark knock is eliminated. The ECM will always try to work back to zero compensation or no spark retard. In order to differentiate between normal engine noise and actual spark knock, the ECM will sample the knock sensor 2 signal for a certain length of time under different engine speeds and loads during non-cylinder firing events. This sampling is used to determine a range of acceptable normal engine noise. DTC P0332 sets when the ECM does not detect sufficient normal engine noise from knock sensor 2 for a certain length of time.