Circuit Description

WARNING: This page is about a different car, the 1998 Pontiac Trans Sport, 1998 Oldsmobile Silhouette, and 1998 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Knock Sensor (KS) module is integrated in PCM circuit. 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 P0325.

Conditions for setting DTC:

No CKP, CMP, ECT, MAF, TP or VSS DTCs set.
Engine speed 1000-5000 RPM.
Throttle angle greater than 10 percent.
Engine load greater than 55 percent.
ECT greater than 167°F (75°C).
Maximum retard less than 15 degrees.
System voltage greater than 9 volts.