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Home >> Chevrolet >> 2004 >> S10 Pickup >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Engine Controls Diagnosis - 4.3L (DTC P0140 To DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, Or P2610)) >> Diagnostic Trouble Codes >> DTC P0327 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 GMC Safari and 2004 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) monitors a knock sensor (KS) in order to determine if detonation is present. The KS produces an AC voltage at all engine speeds and loads. The powertrain control module (PCM) then adjusts the spark timing based on the amplitude and frequency of the KS signal. The PCM uses the KS signal to calculate the average voltage and then assigns a voltage range value. The PCM should monitor the KS signal within the assigned voltage range. This diagnostic trouble code (DTC) will set if the KS signal is outside the assigned voltage range or the KS signal is not present.

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