On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium There is a 14 day free trial. (Chapter 3) Transistors, Solenoids, Computer Controlled Output Testingįor more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at as an eBook or paper book. (Chapter 8) Pressure Sensor Testing, MAP, BARO, DPFE, fuel tank and rail pressure sensors Deluxe DMM w/Amp Shutters (AES# esi-582) How to test the computer transistor driver for the EVR solenoid How to test the DPFE sensor for proper operation How to determine if the EGR passages are clean How to manually energize the EGR solenoid (EVR) and force the EGR valve to open How to identify solenoid circuit design (power or ground side switching)

remove EGR and throttle body for typical cleaning of the passages restricted intake passage for the EGR valve (the exhaust side of the EGR is almost never the issue, only the intake side will plug up with carbon) possible detonation or pre-ignition 'pinging' complaints Check engine light (P0401 Insufficient EGR flow or P0402 excessive EGR flow) The vehicle being tested is a 2000 Ford Expedition with a 5.4L engine.Įngine Performance Diagnostics chapter 24

The testing procedures shown in this video can be applied to any Ford, Lincoln or Mercury that uses a vacuum controlled EGR valve combined with a Delta Pressure Feedback EGR sensor (DPFE).

Ford engine codes p0401