Go Back   EcoModder Forum > EcoModding > Instrumentation
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 12-17-2016, 02:40 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Jul 2009
Location: London UK
Posts: 86

VW GOLF - '96 Volkwagen Golf MK3 GL
TEAM VW AUDI Group
90 day: 50.21 mpg (US)

Commute scoot - '95 Suzuki AE50 Style
Last 3: 70.4 mpg (US)

The German - '99 Mercedes W202 C200 Classic
90 day: 27.65 mpg (US)
Thanks: 0
Thanked 9 Times in 7 Posts
MPGuino injector connection - no 0v feed

I've built my MPGuino and have got it recognising the difference between stopped (0mph) and moving (some mph).

I just want to double check the connection to the injector system. I have a 1999 Mercedes Benz C-Class (petrol). It uses a HFM or PMS injection system (Siemens I think, or maybe Bosch?).

I have probed the injector wires with a digi-meter in DV volts mode (20v), connected with (+) in the plug and (-) tgoing to a bolt on the head, looking for the 0v one.

I can see there is one hovering just under (12v) which must be the power wire, but the other starts at 0v then rises quickly to around 5v.

Now I assume "injectors is injectors" so to speak, and the 5v wire is the one to tap into. Surely the Bosch fuel system on the car cannot be any different from any other injection system?

Anyone got a clue (coz I don't!)...

__________________






Will you recoup money spent on mods in fuel saved? see my spreadsheets here
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 12-18-2016, 02:59 PM   #2 (permalink)
MPGuino Supporter
 
t vago's Avatar
 
Join Date: Oct 2010
Location: Cedar Rapids, IA
Posts: 1,766

The Karen-Mobile - '05 Dodge Magnum SXT
Team Dodge
90 day: 26.72 mpg (US)

Fiat Dakota - '00 Dodge Dakota SLT RWD Quad Cab
90 day: 16.67 mpg (US)

The Red Sled - '01 Dodge Durango SLT 4WD
90 day: 16.96 mpg (US)
Thanks: 799
Thanked 682 Times in 437 Posts
It would seem that you found the injector wire to use. Go ahead and try to use the wire that starts off at 0 VDC, then rises to about 5 VDC. That is likely your DVM charging up the capacitor filter on the injector switching circuit.
__________________
The Fiat Dakota


The Karen-mobile


The Red Sled
  Reply With Quote
Old 12-18-2016, 03:42 PM   #3 (permalink)
EcoModding Lurker
 
Join Date: Jul 2009
Location: London UK
Posts: 86

VW GOLF - '96 Volkwagen Golf MK3 GL
TEAM VW AUDI Group
90 day: 50.21 mpg (US)

Commute scoot - '95 Suzuki AE50 Style
Last 3: 70.4 mpg (US)

The German - '99 Mercedes W202 C200 Classic
90 day: 27.65 mpg (US)
Thanks: 0
Thanked 9 Times in 7 Posts
Cheers - I can confirm that's the correct wire - the car isn't bothered by the connection and the MPGuino now shows some numbers from the injector.

Hopefully will get the vss problem sorted and be in business after some calibration.

__________________






Will you recoup money spent on mods in fuel saved? see my spreadsheets here
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com