Circuit Description

WARNING: This page is about a different car, the 2000 Isuzu Rodeo and 2000 Isuzu Amigo. However, it is still accessible from the selected car via links, so may be relevant.

PCM monitors EGR valve pintle position input to ensure EGR valve responds properly to commands from the PCM. If PCM detects a pintle position signal voltage less than the normal range of the pintle position sensor, or a signal voltage that is not within a tolerance considered acceptable for proper EGR system operation, the PCM will set DTC P1404. MIL will be illuminated when DTC P1404 is set on 2 consecutive trips.

Conditions required for setting this DTC are:

IAT is greater than 41°F (5°C).
EGR actual position is 16 counts less than EGR low threshold for a least 6.3 seconds.