318ti.org forum - View Single Post - Do i NEED to wire up my road speed signal?

e30/e36_kid89 · 09-18-2011, 04:30 PM

Hey all, about 3 weeks ago i went ahead and dropped in a fully built/bored m52b28 turbo setup in my wonderful hatch. it's running on obd1 electronics in a 3/96 obd2 chassis. EWS has been deleted. For the first time i stopped by my buddies shop just to have the car scanned for codes since i never did this when putting everything together and the ONLY code that came up was road speed/VSS sensor. Now from my e30 swap days i know this is important as with no VSS input to the Dme = no vanos working

There's a test where if you are rolling and put the car in neutral the dme is supposed to raise the rpms to about 1100 and once you stop it'll go back down(this test worked on my old m50 swapped e30) and my ti does not do it.I've searched through a few threads where guys have said they had to wire the road speed signal but again i want to be sure. I still have the stock diff in there as i'm taking it easy for the break-in process so i don't think it's a mix-up of sensors.

I've been through the etm and right now it looks like i will have to wire it up. If it matters my Ti is an active and has the obc with speed, range, comsumption etc. I was under the impression if i had that then the speed signal was already there and pnp.

EDIT just checked and i do have pin 24 on the chassis side of the x20 connector...

so did i miss a critical mandatory step in wiring in that speed signal wire?

TIA

09-18-2011, 04:30 PM	#1
e30/e36_kid89 Junior Member Join Date: Oct 2010 Location: Toronto, ON Posts: 23 iTrader: (0) Photo Gallery	Do i NEED to wire up my road speed signal? Hey all, about 3 weeks ago i went ahead and dropped in a fully built/bored m52b28 turbo setup in my wonderful hatch. it's running on obd1 electronics in a 3/96 obd2 chassis. EWS has been deleted. For the first time i stopped by my buddies shop just to have the car scanned for codes since i never did this when putting everything together and the ONLY code that came up was road speed/VSS sensor. Now from my e30 swap days i know this is important as with no VSS input to the Dme = no vanos working There's a test where if you are rolling and put the car in neutral the dme is supposed to raise the rpms to about 1100 and once you stop it'll go back down(this test worked on my old m50 swapped e30) and my ti does not do it.I've searched through a few threads where guys have said they had to wire the road speed signal but again i want to be sure. I still have the stock diff in there as i'm taking it easy for the break-in process so i don't think it's a mix-up of sensors. I've been through the etm and right now it looks like i will have to wire it up. If it matters my Ti is an active and has the obc with speed, range, comsumption etc. I was under the impression if i had that then the speed signal was already there and pnp. EDIT just checked and i do have pin 24 on the chassis side of the x20 connector... so did i miss a critical mandatory step in wiring in that speed signal wire? TIA Last edited by e30/e36_kid89; 09-18-2011 at 04:46 PM.