Got a 2006 Audi a4 2.0 TDI BRE engine with a p0403 EGR code
Customers complaint was EML light on, lack of power and the automatic transmission not changing up the gears properly
Removed the EGR valve and was choked up beyond cleaning so replace it and gasket as my local audi parts supplier stocked one and i have had trouble with these before. Cleared codes and test drove car and full power returned and light stayed out but after 3 miles the car died down in power struggle to get past 40mph and EML returned.
Scoped air mass meter incase there was a fault but it peaked at over 4.5 so went onto EGR itself but its a 6 pin, 5 wire plug so wasn't sure what wire did what so probed them one by one.
I'm taking it pin 5 is the duty cycle but something doesn't look right because after initial start up the duty cycle changed to a 14v line and and stays there so i am not sure what is going on so looking for some pointers where to go next.
It has the throttle body bolted to egr then egr bolted between it and manifold and is all electric no vacuum pipes etc so take it that is the N18 and G212?
Not sure what wire should be doing what on EGR i had 5v on one wire 14v on another etc would rather try and get a wiring diagram so i knew what was what.
Code description is 16787/P0403/001027 - Exhaust Gas Recirculation (EGR) Valve (N18): Malfunction
Scanner is an autodiagnos multi tester pro and the live data is in measuring blocks i am not sure what is what to look at live data will maybe check tomorrow if i can get any decent live data through the tool.