RMarine
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| posted on 15/7/10 at 10:53 PM |
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megajolt to TPS problems
So here’s the next problem I have.... I now got the engine running and the megajolt talking to the pc and I seem to have a problem with the TPS
talking to the MJ.
I have included a screeny of the MJ desktop. I have tried to re-calibrate it using the tools menu but I get an error message telling me to ensure that
the tps is not wiring backward, so I have swapped then and still it comes up with the same massage....
Please Help
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RMarine
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| posted on 15/7/10 at 10:55 PM |
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i cant post the screeny at the moment for some reason. anyway it reads 99% all the time, even with the engine started and the thottle being used
[Edited on 15/7/10 by RMarine]
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ashg
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| posted on 15/7/10 at 11:16 PM |
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it may sound silly but there is a menu in the settings where you have to tell it if there is a map or tps fitted, from memory i believe that it wont
calibrate properly until this is set and flashed on to the chip.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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RMarine
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| posted on 16/7/10 at 12:00 AM |
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no, i have it set to tps. thanks away
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Werner Van Loock
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| posted on 16/7/10 at 05:42 AM |
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what tps have you used and how is wired? Measured some values already with a ohmmeter?
http://www.clubstylus.be
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scudderfish
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| posted on 16/7/10 at 05:50 AM |
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This is where you need at least three hands 
The TPS has three wires, ground, +5v, and signal. Disconnect the signal line to the megajolt. Set your multimeter to a low DC voltage range
(probably 20V) and connect it to the ground and signal wires. You _should_ see a low voltage when the throttle is closed are a greater one when it is
open. What readings do you get?
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RMarine
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| posted on 16/7/10 at 10:45 AM |
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i'll try when i get home tonight
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RMarine
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| posted on 16/7/10 at 07:26 PM |
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right, i have set my multimeter to 20k ohms and closed im getting 1.10 and open im getting 3.46 .. what do you think?
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RMarine
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| posted on 16/7/10 at 08:03 PM |
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ok, i have tried the wire at the tps for voltage and i am getting none from the +5v. so i found one of the spare wires from the MJ was sendding +5v.
so i rigged that up to the tps with the same results..... any ideas?
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scudderfish
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| posted on 16/7/10 at 08:54 PM |
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If you're getting some measurable variation on the TPS then it probably isn't knackered. Do you have it wired up like this?
(taken from http://www.autosportlabs.net/MJLJ_V4_vehicle_installation_guide )
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RMarine
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| posted on 16/7/10 at 09:14 PM |
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i have the tps grounded to the chassis. is that ok?
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RMarine
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| posted on 16/7/10 at 09:34 PM |
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edis is grounded and i just tried wiring the ground from the tps to the MJ and got the same result.
should the Vref (white wire) have a voltage or reading of some kind against the ground?
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RMarine
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| posted on 16/7/10 at 10:15 PM |
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right, i have taken a +5v from a spare on the MJ, so the sigal from the tps to the mj is 0.69v when closed and 2.19v when open... that should work
right????? also should i be worried that where i should be taking the +5v isnt working?
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scudderfish
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| posted on 17/7/10 at 06:18 AM |
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I'll take some measurements on my TPS this morning and let you know.
Regards,
Dave
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