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Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 14,707
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Megasquirt help!!!
I am having a problem with my Megasquirt EFI conversion that is driving me nuts. I purchased my kit from Mike at Motomotions and he has been very helpful with trying to solve this but no luck to date. I have Megasquirt II and the problem I'm having is I can't get a good TPS signal. When setting up the ECU with software you get to a point where you calibrate the TPS settings, when you do this it is supposed to "auto populate" with a idle setting of aprox. 14-18 and a full throttle setting of aprox. 140-180. When I "auto populate" the TPS I get a reading of 14 at idle and 3 at full throttle. We have replaced the TPS sensor with no change and the relay board has been replaced and I still get the same reading. All other software downloads appear to be working correctly. I have good voltage at the relay board for both battery and switched battery and I've triple checked all wiring. I am baffled,frustrated,confused,suicidal etc. this is driving me nuts!!! If I can't get the TPS working correctly I'm going to have to try and run MAP only. Any help is GREATLY appreciated.
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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02-07-2006, 05:16 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,818
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It sounds like you have the TPS wired wrong if the value decreases as you open the throttle.
If the motomotion kit uses ITBs MAP only isnt a good idea me thinks.
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Don't feed the trolls. Don't quote the trolls  http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
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02-07-2006, 05:44 PM
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are you using the "ford" style TPS?
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big AL '77 911 |
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02-07-2006, 05:50 PM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Quote:
Rick, I'll get with Mike for an undate on what's been performed and we'll get you fixed up. |
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02-07-2006, 06:03 PM
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Registered
Join Date: Oct 2005
Location: Kihei, HI - Maui
Posts: 593
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Sounds like Souk and Mike will take care of you. I think TimT has the problem identified. Looks like you need to swap the two outside wires on the TPS to reverse the output values.
Mike |
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02-07-2006, 06:08 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,818
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Quote:
Quote:
sounds like a polarity issue to me
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Don't feed the trolls. Don't quote the trolls http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
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02-07-2006, 06:13 PM
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Registered
Join Date: Jun 2003
Location: Mineral, Va.
Posts: 171
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I agree with Tim, sounds like you have two of your wires reversed. You're also not getting a very wide spread of values.
I'm still running the Tbitz setup which has custom code that eliminates the need for a TPS, but I added a GM one from a saturn in preparation for upgrading to MSII. Mine goes from about 2 or 3 at idle to about 85 at WOT. I'm not using a relay board, but that shouldn't matter. Good luck getting things sorted out. -Mac |
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02-07-2006, 06:18 PM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Right Tim. I read your post a little to quickly as I was rushing to get something out the door. I should have stated that we do not require MAP sensing.
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02-07-2006, 06:30 PM
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Registered
Join Date: Feb 2003
Location: Black Rock, CT
Posts: 4,345
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Sorry to be off topic here, but Souk, I am going to be calling you guys about doing my 2.7 up with ITBs and Megasquirt and spark, but I have to say, I need to study up. Can anyone give me a great place to get a good bsic primer so I don't put you to sleep with basic questions?
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Jake Gulick, Black Rock, CT. '73 yellow 911E , & 2003 BMW M3 Cab. Ex: 84 Mazda RX-7 SCCA racer. did ok with it, set some records, won some races, but it wore out, LOL[/B] |
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02-07-2006, 08:52 PM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Hey Jake. Mike has all the the "primer" you need. Shoot him an e-mail.
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02-07-2006, 09:01 PM
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never ending projects
Join Date: Oct 2003
Location: greensboro, NC
Posts: 671
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02-07-2006, 11:15 PM
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Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 14,707
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The TPS sensor from the search I have done is from Rover/Jaguar. It has 3 terminals-ground,signal and 5 volt. The diagram that came with the TPS said the left wire was ground, the center is signal and the right is 5 volt. Mike has suggested and we have tried switching the 2 outside wires back and forth on the relay board, for those not familiar with the relay board it has a "buss bar" type setup so it's easy to move/switch wires but still the same readings. I can think of no reason that the wires have to be swapped at the TPS sensor but maybe I'm wrong. Souk I very much appreciate all the help Mike has provided and maybe between the two of you we can get this solved. I have nothing but praise for you guys,the quality of the components and your customer appreciation, I just am frustrated that my cars not running. Thanks everyone I'll keep posting results.
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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02-08-2006, 01:49 AM
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