Circuit Description
PCM closes EGR system on engine start-up to test for any flow. If PCM detects any EGR flow occurring on start-up during 2 consecutive trips, DTC P0402 will be set. DTC is a "B" code.
Conditions required to set DTC are:
- Intake air temperature is greater than 41°F (5°C).
- Engine RPM is less than 500 RPM.
- EGR pintle position is greater than 55 counts.