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EGR operation
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methley
a.k.a. Big Hairy Ski Monster 


Member Since: 07 Oct 2008
Location: Marshfield, South Glos
Posts: 2433

England 2006 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3
EGR operation

Ok, here's today's obscure questions for you...

1, Is there anyone out there who knows what the frequency and magnitude of the PWM signal is which operates the EGR valves?
2, Can anyone confirm what the range of resistance values are for the feedback resistor in the EGR valves (I think it's 300 - 2500 ohms).
3, Which way around is this resistance? Is it high when the PWM signal is at 100% or the other way around?

Cheers,

Andy Andy

Fridge Slide for sale https://www.disco3.co.uk/forum/post2064622.html#2064622  
Post #5469456th Nov 2009 3:49 pm
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Frapp
 


Member Since: 19 Dec 2008
Location: Norff Zummerzet
Posts: 1653

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Indus SilverDiscovery 4

Andy

You lost me on that one Shocked

I'll stick to driving JCB's Rolling with laughter

Ray Thumbs Up  
Post #5470156th Nov 2009 5:45 pm
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stapldm
 


Member Since: 11 Sep 2006
Location: Swine Town
Posts: 2330

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

Methley, some guesswork here...

1a. You can hear the tone of the servo's under the bonnet immediately after switch off, so I'm going to assume several kHz.
1b. Going to stab at 12V; for maximum PMW torque and hence fastest reaction, you need highest volts; so assuming no voltage multipliers, it's going to be +ve battery voltage.
2 & 3. Not a scooby Laughing

Someone with an oscilloscope and test meter could answer better. Dr. Ian Malcolm:
"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
Transgenic tomato anyone?  
Post #5471316th Nov 2009 9:09 pm
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ad15
 


Member Since: 14 Dec 2008
Location: up that tree
Posts: 4866

United Kingdom 2005 Discovery 3 TDV6 SE Manual Tonga GreenDiscovery 3

3 kangaroo's and a haddock.... Whistle

Ok monkeysocks??? Wink one wife.......livid  
Post #5471396th Nov 2009 9:19 pm
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methley
a.k.a. Big Hairy Ski Monster 


Member Since: 07 Oct 2008
Location: Marshfield, South Glos
Posts: 2433

England 2006 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3

Oh dear you're not pished again are you? Laughing

Seriously, if anyone can have a look with a scope, then that would be handy! Andy

Fridge Slide for sale https://www.disco3.co.uk/forum/post2064622.html#2064622  
Post #5471706th Nov 2009 10:06 pm
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