Myles Posted December 16, 2004 Share Posted December 16, 2004 I understand the Eu3 MAP sensor combines two functions - manifold-pressure and inlet air-temp and has four wires... Can anyone confirm what the four wires are - specifically - is one of the connections is to a +5V supply??? Project Scope-Creep is underway... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
j_thombs Posted December 16, 2004 Share Posted December 16, 2004 I can't confirm it for sure but usually TMAP sensors have a precision 5V reference voltage from the ECU. Jon Ex Beaulieu no31 and now ex Supersport R......so 7less at the moment My Caterham Pics Link to comment Share on other sites More sharing options...
Myles Posted December 16, 2004 Author Share Posted December 16, 2004 Thanks, I've also found reference to a +5V supply for a MAP sensor in the Emerald manual this evening. As far as I can tell, then, my wiring is fine and makes sense. I wonder why I'm not getting a reading on the Emerald then... If it was a problem with the sensor or the EU3 loom, I'd have thought the MEMS would have complained, wouldn't it??? Or are the adjustments made in relation to IAT and MAP not that great under normal conditions? Project Scope-Creep is underway... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Frying Pan Posted December 16, 2004 Share Posted December 16, 2004 It could be that your sensor is buggered If it can't see an input, MEMS sets a sensible default value for both MAP and IAT. Whilst not ideal, they are a useful 'get you home' feature. It only really complains if it can't detect crank position. Makes it a bit hit and miss when to fire injectors and sparks 😬 Guy See some pictures of the build here. 4000 miles completed! Link to comment Share on other sites More sharing options...
Myles Posted December 16, 2004 Author Share Posted December 16, 2004 Could be! I've not got Haynes handy (not that it covers EU3) - but isn't there an intermediate minor loom-plug/socket between the injectors/TPS/IACV etc. and the EU3-plug(s) proper? Could be a problem there... The annoying thing (at this stage) is that I didn't take notice of the MAP figures - I just saw that they were reporting something. I've got a sneaky suspicion that they were reporting nonsensical values... ☹️ I've just had a look at the Emerald manual, and it says that the red XXX reading I saw for IAT will also be shown if the signal is out of range - not just when disconnected. Are these sensors 'expensive'?... I notice that the MAP-only (not TMAP) one they sell is £70!!! Project Scope-Creep is underway... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Edited by - Myles on 16 Dec 2004 22:44:21 Link to comment Share on other sites More sharing options...
Mr Locust Posted December 17, 2004 Share Posted December 17, 2004 Elise manual you downloaded is EU3 Engine management section gives useful snippets on sensor operation etc and the wiring diagram section may be useful ISTR MAP=25-40kPa @ idle if it's working correctly. Best way I've found of setting idle up when using mems. Ian Green and Silver Roadsport 😬 Link to comment Share on other sites More sharing options...
Myles Posted December 17, 2004 Author Share Posted December 17, 2004 Best way I've found of setting idle up when using mems. You have got me there.... Haven't the foggiest how you'd be able to measure that with the MEMS... I'll take a look at the .pdf then - I was looking at the CC version. Regds. Project Scope-Creep is underway... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Mr Locust Posted December 17, 2004 Share Posted December 17, 2004 Myles, slightly misleading perhaps 😬 I was measuring MAP but not with the MAP sensor. I used a vacuum gauge conncted to the spare tapping (next to the TB) on the manifold and set to idle at 30-40kPa rolling/fluctuating reading with the IACV blocked off i.e. just allowing fuel ignition trims to operate. Gives a very good idle Still can't get the fuel overrun cutoff to be 'seamless' though Ian Green and Silver Roadsport 😬 Link to comment Share on other sites More sharing options...
charlie_pank Posted December 17, 2004 Share Posted December 17, 2004 MAP is around 50 squids IIRC Link to comment Share on other sites More sharing options...
oldbutnotslow Posted December 17, 2004 Share Posted December 17, 2004 Bl++dy hell Myles, Am I going to have to understand this? Its going to be a steep learning curve if I do. Looking forward to you producing an idiots guide just for me ❗ Keep up the good work 😬 Grant Black and stone chip here Link to comment Share on other sites More sharing options...
Mr Locust Posted December 17, 2004 Share Posted December 17, 2004 Myles, have you got a picture of the tmap sensor in your collection? Ian Green and Silver Roadsport 😬 Link to comment Share on other sites More sharing options...
Myles Posted December 17, 2004 Author Share Posted December 17, 2004 Erm, not specifically. - I suspect it might have been caught on camera though... Hang on. MMm, doesn't really look like it. It is the blob just below the 'in' from 'injection' on the cam-ladder cover in this shot here - but that doesn't help... Project Scope-Creep is underway... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Edited by - Myles on 17 Dec 2004 18:56:50 Link to comment Share on other sites More sharing options...
Mr Locust Posted December 17, 2004 Share Posted December 17, 2004 No it was more the other end I was thinking of. Ian Green and Silver Roadsport 😬 Link to comment Share on other sites More sharing options...
Myles Posted December 17, 2004 Author Share Posted December 17, 2004 I haven't taken it out - but I'm hoping to borrow one from a local friend tomorrow... Project Scope-Creep is underway... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Mr Locust Posted December 17, 2004 Share Posted December 17, 2004 Just a thought as to whether the MAP sensor can be damped wrt its exposure to the MAP. EU2 system was mounted at the end of a tube which must of had a damping effect on the signal. Ian Green and Silver Roadsport 😬 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now