Circuit Description

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

Knock Sensor (KS) module is located in PCM. KS module monitors both knock sensors to determine if detonation is present. If excessive knock is present, PCM will retard timing until knock goes away. When KS module is missing or malfunctioning, KS circuit voltage going to PCM will go low. PCM interprets this low signal as spark knock. Conditions for setting DTC:

Engine speed is 1500-3500 RPM.
ECT greater than 135°F (60°C).
TP sensor angle greater than 0.5 percent.
Engine operating for greater than 20 seconds.
A malfunction with KS module or circuits to module are faulty.
Conditions present for 3 seconds.