Chris Angus
Pin one is activation of egr from ecu 12v dc
Pin two is supply
Pin three is earth
Pin four I'm not sure about, it is the 4.5 signal DC you have seen, but it doesn't seem to change when activated, didn't have enough time to do any other tests, but I'm thinking it's feedback, maybe current sensing?.
Some live data
Engine at idle
Egr command at 100% (off)
egr pulse ratio 95%
egr feedback ok
Maf 490 mg/stroke
Engine at idle
egr command 37%
egr pulse ratio 34%
egr feedback ok
Maf 280 mg/stroke
Engine at 1500rpm
Egr command 26%
egr pulse ratio 28%
maf 300 mg/stroke
egr feedback ok
Hope this helps
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Vauxhall Zafira 2.0 Y20DTH 2004 - EGR fault, code P0400 # - Ian Durston March 26, 2016, 4:44 pm
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on March 30, 2016, 12:25 pm, in reply to "