Circuit Description

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

PCM monitors EGR valve pintle position input to ensure valve responds properly to commands from PCM and to detect a fault if current pintle zero position is different from learned zero position. If PCM detects a pintle position signal indicates more than 30 percent difference between current zero position and learned zero position for more than 5 seconds and condition exists 3 times during trip, PCM will set DTC P1404.

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 turn MIL off on third consecutive trip cycle during which diagnostic runs and fault is no longer recognized. A history DTC 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.