In this video I show another variable when it comes to testing this type of EGR valve. (open 5v reference circuit from a bad engine computer) I’ll also show you how I repaired this problem without replacing the computer.
Engine Performance Diagnostics chapter 9
Symptoms
– check engine light (P1406, P0300)
Fix
– re-wire one of the 5v reference circuits
Tests shown
– how to use scan data to identify a problem with the EGR position circuit
– identifying a power or ground side output with a multimeter
– how to use a multimeter to manually actuate an EGR solenoid
– how to test an EGR position sensor with a multimeter
– understanding 5V reference circuits, separate externally/shared internally
– how to perform a pin drag test
– how to jumper a 5V reference circuit for testing purposes
Tools used
– Autel MS908 MaxiSYS Automotive Diagnostic & Analysis System – USA Version
https://www.jbtoolsales.com/autel-ms908-maxisys-automotive-diagnostic-analysis-system-usa-version#oid=1014_1
– ATD Tools 5519 Auto Ranging Digital Multimeter with Protective Holster
https://www.jbtoolsales.com/atd-tools-5519-auto-ranging-digital-multimeter-with-protective-holster#oid=1014_1
Playlist
– (Chapter 24) EGR Flow and System Tests
https://www.youtube.com/playlist?list=PLAFYVCyenqcrqfDNVnVxC_76uRT16Wjew
Related videos
– How to test for EGR flow problems (GM electronic EGR test) – P0401
– EGR Closed Performance P1404 with new EGR valve installed (GM)
– No Start from a shorted MAP sensor (Honda, Acura)
– How to check the 5v reference circuit for a short to ground (Cadillac)
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 right here on YouTube. There is a 14 day free trial.
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Post time: Jun-13-2017