Circuit Description

Knock Sensor (KS) module is integrated with PCM. KS module reads KS to determine if excessive detonation (knock) is present. If excessive knock is present, PCM will retard timing until knock goes away. When KS module is missing or malfunctioning, PCM will set DTC. Conditions for setting DTC:

• System voltage greater than 9 volts.
• PCM detects problem with KS module causing knock to be indicated continuously.
• Conditions present for up to 2.5 seconds.