Circuit Description

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 running DTC are: engine speed is 1500-3000 RPM, throttle angle is greater than 0.5 percent, ECT greater than 140°F (60°C), MAP less than 44 kPa, and engine run time is greater than 20 seconds.

DTC will set when PCM detects a malfunction in the integrated knock sensor system or circuits and with conditions present for 20 seconds.