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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 P0325 >> 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 knock sensor (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. Then the PCM assigns a voltage value. The PCM checks the KS and related wiring by comparing the actual knock signal to the assigned voltage range. A normal KS signal should stay within the assigned voltage range. This diagnostic trouble code (DTC) will set if the PCM malfunctions in a manner that will not allow proper diagnosis of the KS system.

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