Discussion
I have just started in insyalled a launch control and flat shift system to my polo but have come across a problem.
there is a connection the the TPS and when the throttle was fully open the led on the new unit was supposed to flash and stop on when it was shut. Mine didnt it worked the other way round, it flashed when fully closed and stopped on when fully open
I got round this by moving the postion of the tps and hold the throttle full open before fitting it. but my problem is that when i pluged in the lap top to align the throttle pot it now works in reverse so throttle fully shut is load site 15 and fully open is 0 ( working in reverse.)
Is there any way to to cure this with the lap top.
there is a connection the the TPS and when the throttle was fully open the led on the new unit was supposed to flash and stop on when it was shut. Mine didnt it worked the other way round, it flashed when fully closed and stopped on when fully open
I got round this by moving the postion of the tps and hold the throttle full open before fitting it. but my problem is that when i pluged in the lap top to align the throttle pot it now works in reverse so throttle fully shut is load site 15 and fully open is 0 ( working in reverse.)
Is there any way to to cure this with the lap top.
Is this throttle pot already used for the engine management system, or something you've added? I'd expect any OEM engine management system to use a throttle pot, but if it's used by the original ECU your comments about changing the orientation don't make sense.
If it's something you've added then from the sound of it you've simply wired the pot in back to front.
If it's something you've added then from the sound of it you've simply wired the pot in back to front.
the tps has been in for a while and worked fine its just when i have fitted this new unit that it seems to work the opposite way to the the ecu.
I made it work by holding the butterfly on the throttle body fully open then fitted the TPS. So in otherwords it got installed in the fully open position and not fully closed as normal
I remember reading in Dave Walkers section in PPC mag that sometimes that 1.8 20v T TPSs work back to front. I will give him a call tomorrow if i cant figure it out.
I made it work by holding the butterfly on the throttle body fully open then fitted the TPS. So in otherwords it got installed in the fully open position and not fully closed as normal
I remember reading in Dave Walkers section in PPC mag that sometimes that 1.8 20v T TPSs work back to front. I will give him a call tomorrow if i cant figure it out.
Edited by marT350T on Sunday 11th January 18:06
marT350T said:
I made it work by holding the butterfly on the throttle body fully open then fitted the TPS. So in otherwords it got installed in the fully open position and not fully closed as normal
That's the part I don't get. As far as I can see this will have either broken the throttle pot, or screwed up the ECU.why ?
The throttle but will give 0-5v travelling 90 deg in either direction. if I have have the throttle fully open and added the tps and closed the throttle it will have travelled 90 deg therefore showing 5v and load site 15. then if I open the throttle it will read 0v and load site 1
I have just removed the tps and put it back how it was and it works fine its just this new unit that works back to front when compared to the ecu
The throttle but will give 0-5v travelling 90 deg in either direction. if I have have the throttle fully open and added the tps and closed the throttle it will have travelled 90 deg therefore showing 5v and load site 15. then if I open the throttle it will read 0v and load site 1
I have just removed the tps and put it back how it was and it works fine its just this new unit that works back to front when compared to the ecu
I have seen an "invert tps" button somewhere but struggling to remember if its on emerald or one of the other ecus ive worked on recently.
Are you trying to run 2 control systems from the one throttle pot? Would it be easier to use 2 throttle pots if you cant invert the signal? RS components do a pot which can be run either direction, the 8mm D runs right through so you can mount it either way, you could mount two pots back to back, all you need is a D shaped 8mm shaft extension .. ?
Are you trying to run 2 control systems from the one throttle pot? Would it be easier to use 2 throttle pots if you cant invert the signal? RS components do a pot which can be run either direction, the 8mm D runs right through so you can mount it either way, you could mount two pots back to back, all you need is a D shaped 8mm shaft extension .. ?
stevieturbo said:
Im not 100% sure its those 2 wires, but defo swapping 1 pair will do it.
The two to swap would be the +12v and earth. But this sort of thing would screw up the original ECU, which is sharing the same throttle pot now as I understand it. Mind you, I don't understand what the OP did by turning the pot through 90 degrees or how the ECU is still getting a sensible throttle signal from it afterwards. I'd expect it to be substantially messed up by that.GreenV8S said:
stevieturbo said:
Im not 100% sure its those 2 wires, but defo swapping 1 pair will do it.
The two to swap would be the +12v and earth. But this sort of thing would screw up the original ECU, which is sharing the same throttle pot now as I understand it. Mind you, I don't understand what the OP did by turning the pot through 90 degrees or how the ECU is still getting a sensible throttle signal from it afterwards. I'd expect it to be substantially messed up by that.Swapping wires wont harm the ecu, unless you dead short the 5v to ground. But that would be silly
Is this a VAG 20vt engine?
I had problems connecting the tps to megasquirt & had to reverse the wires. More info here - http://www.conrod.co.uk/msd20v.html
I found some useful sensor info at this site when I did my swap (go to engine swap / electrics) - http://rush.smolly.nl/mainindex.htm
I had problems connecting the tps to megasquirt & had to reverse the wires. More info here - http://www.conrod.co.uk/msd20v.html
I found some useful sensor info at this site when I did my swap (go to engine swap / electrics) - http://rush.smolly.nl/mainindex.htm
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