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Home >> Chevrolet >> 2001 >> Chevy Express G3500, Van Cargo Extended, 4.3 W >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0325: Knock Sensor Module Circuit >> Description

DTC P0325: Knock Sensor Module Circuit: Description

Knock Sensor (KS) produces an AC voltage at all engine speeds and loads. Powertrain Control Module (PCM) then adjusts spark timing based on amplitude and frequency of KS signal. PCM uses KS signal to calculate average voltage. Then PCM assigns a voltage value. PCM checks KS and related wiring by comparing actual knock signal to assigned voltage range. A normal KS signal should stay within assigned voltage range. DTC will set if PCM malfunctions in a manner that will not allow proper diagnosis of KS system.

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