How to test for EGR flow problems (GM electronic EGR test) - P0401

توضیحات:

The testing procedures shown in this video apply to all electronic style EGR systems. In particular the 5-wire Linear EGR valve used on many different GM vehicles. The car being tested has a 3100 engine in it. (3.1L)
This engine is notorious for have problems with plugged EGR passages in the intake manifold. Also these electronic EGR valves will stick in both the open and closed positions.

Symptoms:
- Check engine light (P0401)
- "pinging" under load

Fix:
- cleaned out restricted EGR intake passage

Testing procedures shown:
- how to test a 5-wire electronic EGR valve
- how to manually energize the EGR valve
- how to energize the EGR valve with a scan tool
- how to test EGR valve position sensor signal with a voltmeter
- how to determine EGR solenoid polarity with a wiring diagram
- how to determine EGR solenoid polarity with a voltmeter
- how to check the EGR passages for a restriction
- how to test and clean the EGR valve

Tools used:
- Digital Multi-meter
- Incandescent Test Light
- Pocket Screwdriver
- Jumper Wire
- Back-probing Tool
- Mechanic wire or old coat hanger

Related videos:
- EGR Closed Performance P1404 - new EGR valve (GM)
https://youtu.be/HT4OnP4U0to
- Ford Ranger EGR Flow Trouble Code P0401 (DPFE fault)
https://youtu.be/RUmH4lwTLKs
- Ford EGR Flow Testing (P0401, P0402, P0405)
https://youtu.be/pH_kjRwD-Xw
- How to test an electronic EGR valve (GM P1406 case study)
https://youtu.be/te_kapz-fj4
- Ford EGR flow quick test (P0401) DPFE fault
https://youtu.be/rA5vX3Epe7w



Playlist:
- (Chapter 24) EGR Flow and System Tests
https://www.youtube.com/playlist?list=PLAFYVCyenqcrqfDNVnVxC_76uRT16Wjew

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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 https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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