Circuit Description

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. However, it is still accessible from the selected car via links, so may be relevant.

Knock Sensor (KS) is used to detect engine detonation. KS produces and sends an AC voltage signal to PCM to identify engine knock being detected. Amplitude and frequency of AC voltage signal depends upon knock level being detected. PCM will retard timing based on this signal.

When DTC sets, PCM illuminates MIL on second trip after fault was detected. PCM will store conditions present when DTC was set as freeze frame data in the FAILURE RECORDS data. PCM will use a calculated spark retard value to minimize knock during conditions when knock is likely to occur. Calculated value will vary based on engine load and speed.

PCM will turn MIL off on third consecutive trip cycle during which diagnostic runs and fault is no longer recognized. A history DTC P0325 will clear after 40 consecutive trip cycles during which diagnostic runs and fault is no longer recognized. DTC can be cleared with scan tool, or by disconnecting battery voltage feed to PCM.