Circuit Description

PCM closes EGR system on engine start-up to test for any flow. If PCM detects any EGR flow occurred on start-up, in 2 consecutive trips, DTC P0402 will be set. DTC is a "B" code.

Conditions required to set DTC are:

• IAT is greater than 41°F (5°C).
• Engine RPM is less than 500 RPM.
• EGR pintle position is greater than 55 counts.