DTC P0327 & P0332: Knock Sensor Circuit Bank 1 & 2: Description
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Pontiac Grand Prix, 2002 Pontiac Bonneville, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, and 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
The Knock Sensor (KS) diagnostic circuitry is contained within the Powertrain Control Module (PCM). The KS produces an AC voltage at all engine speeds and at loads. The PCM adjusts spark timing that is based on the amplitude and on the frequency of the KS signal. The PCM uses the KS signal in order to calculate the average voltage. Then the PCM assigns a voltage value. The PCM inspects the KS and related wiring by comparing the actual knock signal to the assigned voltage range. A normal KS signal should stay outside the assigned voltage range. This DTC will set if the KS signal is within the assigned voltage range, or if the KS signal is not present. DTC P0327 refers to the bank 1 KS and DTC P0332 refers to bank 2 KS.