3200GT Owner for may years.....needing some help

Hi Guys, Ive had a 1999 3200GT for 10-15 years ish.... I've always look after her. Need some help though, not familar with forums and how they work so appologies in advance!

Hi Guys, Firstly apologies for not knowing how to navigate around the site proficiently..Please can someone help me with some links...
Also no familiar with forum eticate so please go easy one me!!

I have had the old girl for many years with very few issues although not used as a daily. I have recently performed the "ebay" contactless TPS fitting....having read here possibly not the best idea, however I am reasonably competent and took care and even videoed the whole process if any of you want to examine that. Bottom line is I followed the instructions and I fully understand that we now have one sensor not the two that double check each other. I'm happy with that and accept any risk.... I'm happy with how it went, the throttle/pedal response has always been shocking...

So car now has CEL which is P0220 THOTTLE PEDAL SENSOR SWITCH B CIRCUIT MALFUNCTION

The wiring yellow and white cables are still original on the pedal and I suspect i may need to change this?
or get the TB recalibrated?

If anyone can help and save me some time that would be excellent...

Thanks

Del

I had this Del, It eventually turned out to be the throttle body motor magnets braking up and jamming the spindle

Pull off the centre main hose of the TB and push the butterfly with your fingers, if there's any stiffness whatsoever Its knackered!

Dave

Yea that's all OK, i've only just done the Mod.... I suspect it may be that we only have one TPS now and the ecu is looking for two inputs to compare?? Thanks though Dave top man for the reply... Anyone else successfully done the TPS mod?

I didn't do the mod, as the dual circuit is a safety feature. I fitted Davys contactless pedal pot. To me that's a upgrade, joining the wires is more of a bodge.

i also suspect that since it was changing the throttle body that caused this that the mods to the throttle body are at the root of this.

on the TB work you say you only changed one of the sensors? Why only one, when there are two. I suspect the ECU needs to get the same response from both of these for it to work, so changing one and leaving the other is probably not a good idea and will cause errors (which you have). I would reiterate that the TB choke should move freely when you push it with your fingers, and make sure you have checked this.

To check your pedal sensor is ok you need a digital voltmeter connect negative to the body (easiest) and prod the live probe on the yellow and white wires and check the voltages are in spec and also are exactly the same (within 0.015v) especially at idle. If the two outputs are in the range shown then run a calibration as described here in the workshop manual.

i Agree with all you guys say..... and I fully understand why the system has 2. I appreciate the info and I will check out the readings... When you say Davy..is this Dave Askew? I met him and bought some stuff off him probably a decade ago now....he had a Carlton GSI at the time when I also had mine...wonder if he still has, one of my favorite cars back in the day....

No, Davy83 above.

What have you changed? When you say ""ebay" contactless TPS fitting " can you elaborate? Do you mean you opened up the Throttle body and fitted end caps from Ebay? Or did you buy a Throttle Pedal Sensor?

Ok apologies.... appreciate your time. yes opened the throttle body and changed just one end. Disconnected pin 2 on the opposite end and linked it to the new sensor. So effectively just using a single magnetic sensor instead of the two originals.... wish I had read all this first and I may have done things differently, but hey ho that’s where I am. I could have said somebody else did it etc etc.... I understand why there’s two and although not ideal I can live with that I’m sure some of you guys have other motors without duel redundancy fly by wire... Is there a way to check the system properly sees the “two” which is actually one TPS outputs? Or am I misunderstanding things slightly??

Was going to send the link to Ebay item but then didn’t know if that was frowned upon.... and feel slightly embarrassed now for doing it!! I do have the process video’d too... it’s a kit on eBay for about £90.....

I have had that ebay kit in use for years now. It is the same mod that is done by Maseratished also (at least judging by the 'wheeler dealer' episode of 3200).

I think this it what you were looking for https://www.ebay.co.uk/itm/CONTACTL...472530&hash=item33b48f210e:g:Rt0AAOSw9KpW~4Fw

That eBay link doesn't appear to be Maseratished or Roberts Aerospace which are both trading names of Mike Roberts, unless I am mistaken.
The OP should listen to the advice of Davy83 and Contigo as they are both very knowledgeable on all matters 3200

midlifecrisis said:

That eBay link doesn't appear to be Maseratished or Roberts Aerospace which are both trading names of Mike Roberts, unless I am mistaken.
The OP should listen to the advice of Davy83 and Contigo as they are both very knowledgeable on all matters 3200

Click to expand...

No, it is not Maseratisheds add. But it is the parts kit which i assume 'delberts3200' has fitted in his car and Maseratished is offering exact thing as a service.

Tamariini said:

I have had that ebay kit in use for years now. It is the same mod that is done by Maseratished also (at least judging by the 'wheeler dealer' episode of 3200).

I think this it what you were looking for https://www.ebay.co.uk/itm/CONTACTL...472530&hash=item33b48f210e:g:Rt0AAOSw9KpW~4Fw

Click to expand...

Yes that is the kit I have fitted.... and that has bought up the CEL. Confident if that. Just need to figure out why I have CEL now..... did yours go straight in with no issues or lights? Unless of course I do have a dodgy throttle pot/s aswell... hence I will check as Davy suggested

midlifecrisis said:

That eBay link doesn't appear to be Maseratished or Roberts Aerospace which are both trading names of Mike Roberts, unless I am mistaken.
The OP should listen to the advice of Davy83 and Contigo as they are both very knowledgeable on all matters 3200

Click to expand...

I am definitely listening to all posts and appreciate peoples time and comments. These cars are getting more and more expensive to keep going now.... we’re gonna need to stick together! Is there any sensitivity to posting what was done and how the kit is fitted? It’s not 100% successful so ... but don’t want to upset mazzershed man or anybody else ??

Tamariini said:

No, it is not Maseratisheds add. But it is the parts kit which i assume 'delberts3200' has fitted in his car and Maseratished is offering exact thing as a service.

Click to expand...

No sure what massershed fit I guess they fit two of these kits at least?(maybe that’s the difference?) ... which I guess I could do..?

delberts3200 said:

I am definitely listening to all posts and appreciate peoples time and comments. These cars are getting more and more expensive to keep going now.... we’re gonna need to stick together! Is there any sensitivity to posting what was done and how the kit is fitted? It’s not 100% successful so ... but don’t want to upset mazzershed man or anybody else ??

Click to expand...

What I'm badly trying to say is that I could be incorrect on 3200 specific issues whereas Dave and Phil as having lived with them for a very long time will know more and will be more accurate.

Ok so ive looked into this a great deal more...Does anyone know much about the TPS and Pedal Setup? My car only has one pedal(physical unit) Pot not sure if the all did...but Two pots inside the one unit. Mine is mounted vertically and my workshop manual shows it mounted horizontally... I have checked these outputs and they were 389 and 411Mv at tickover. I read somewhere the difference could only be tiny? I then bridged the two outputs and this didn't put out the CEL. The CEL also comes on before you touch the throttle... Any thoughts guys? I have reached out to masereratished i'm hoping they will come back....

I'd still go for the magnets.. did you actually clean out any swarf when took the TB thing apart!

Dave

HI Dave,

So I just fitted this new TB and caused the fault! So the magnetic centre is brand new....no swarf from the magnet or from the work I have done. I did exactly what you suggested and checked again the movement of the butterfly....its exactly as it should be no binding and spring pressure to shut it. Interestingly I have spoken with a local guy that did one of these some years ago and he said there is slack when you fit the magnet to the shaft...the butterfly shaft is a D shape and there was some slack maybe 3-5 degrees.... he seemed to think you had to set this figure to a specific voltage at rest which you read off the sensor and adjust trial end error... that seems likely.... I have got a vid of what i have done if you want to see it...id rather not post it (could poss PM vid). So i think unless someone has fitted one of these, they'd never have any experience of them?? Its not rocket science I just need to figure out whats upsetting it. Still need to know how close the dual outputs from the pedal should be in MV as the code it throws says

P0220 THOTTLE PEDAL SENSOR SWITCH B CIRCUIT MALFUNCTION

But i'm convinced doing the throttle body has caused it ...nut 389 vs 411Mv are these too different?

Does anyone know the standard setup as mine may have been tinkered with in the past I guess....Why is my Pot mounted vertical??

really appreciate your suggestions Dave