Chevy Impala - P0332 Knock Sensor Trouble

In this video we have a look at a 2003 Chevrolet Impala that keeps throwing a P0332. It did not take long to discover the fact that the car had been "touched" a few times. The scope shows the truth though. The knock signal was picking up secondary ignition and raising heck with signal. The vehicle was ran under code setting criteria several times after repair and then a full drive cycle after repair to verify fix. -Enjoy!

DTC P0327 or P0332
Circuit Description
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 diagnostic trouble code (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 diagnostic trouble code (DTC) P0332 refers to bank 2 KS.

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