Megajolt not seeing Throttle Position Sensor Data
Turbo Mini Forums

How do folks

Just had a call from the man setting up my car and he has an issue with my megajolt. The car is running a TPS sensor and he said that the megajolt was set to run with a MAP sensor. He has now switched the megajolt to see and to run with a TPS sensor but the megajolt is only giving a 2d map and isn't using the TPS sensor properly.

He says it is running fine but at the moment the map is only 2d and thus only running like a distributor.

He says the TPS is wired up correctly but the megajolt is just not reading the data properly... which I think is weird as I bought the set up from Simon (madmk1) from his car that was running the exact same stuff.

He suggested that Simon's car would never have been making full use of the TPS sensor as the megajolt wasn't reading the data properly...?

Can anyone shed any light on the situation?

Cheers folks

Edited by tomkidd on 5th Aug, 2012.

p.s. He said it would run as it is, but if I am in a big gear on a long stretch it will pink its tits off as the map is only 2d and it needs more info...

is the sensor the one that was with it?

youve not ended up with a switch have you?

check the 5v & gnd to the tps and meter it to see if the third pin is sweeping voltage.

The sensor is an original weber TPS that Simon ran on his car. Seen here

I'm just wondering if the TPS and the megajolt ECU are actually a pair and I haven't ended up with a MAP megajolt and a TPS, can't imagine how that has happened though

the tps version of mjlj wont have a boost nipple on the mjlj case

Yes i moved to the darkside

Instagram @jdm_brett

There is defo no nipple on the case

re check the mj to be sure it is on tps

Cheers guys. The ECU does not have a vacuum nipple on the body and has apparently been run with the TPS before but I am waiting to hear from Simon.

Any other ideas? As the car is not with me and the tuner wanted me to leave it with him I can only relay what he has said...

Right... just spoken to the guy again and he has checked that the ECU is seeing the TPS and the 5v feed is ok.

The ECU is a TPS version.

The analogue style dial on the screen of the megajolt software is moving and showing the TPS but it isn't feeding the data into the 3d map.

He is wondering if he can reset the firmware on the ECU?? He has another megajolt ECU in stock but it is a MAP version rather than a TPS version.

Thanks for your help folks

I just rang him to talk through the suggestions and he said after reloading the firmware on the ECU it is now working...

So he is just going to run it up on the rolling road and get it something useable until its run in.

Thanks for your help folks

Right... back to where we were...

Just had a call off the bloke who was ranting at me for how long it has taken him to get the car running etc etc.
He then suggested that I didn't tell him it had megajolt on it before I took it to him! He then started to explain to me that he had lost so many hours at his workshop with messing around with computers on engines and that I should just put a distributor on it and a set of point.

Anyway.

Can anyone think of any reason why it would be running fine one minute, and then going back to being a bag of rubbish the next?

He said that one minute it is seeing the TPS and the correct data and then the next it isn't seeing it anything and it is back to running really rough? He reset the firmware on the ECU itself and then ran it up, he then realised it had the basic map on it so then changed to the 1380 map which came on the ECU, he then said it was running crap again.

Is there anyway of checking to see if the ECU I have is faulty or can anyone else think of why one minute it would work fine and then the next minute it would be a pile of crap?

Any help great fully appreciated as I am pretty fed up about it.

I haven't heard of it with Megajolt but on other ecu's a map file can go corrupt and cause issues maybe it's worth trying copying the 1380 map into a new map file to see if that's the issue?

its difficult to diagnose stuff like this over the net other than throwing ideas around,
are the pip/saw wires making good contact?
if you unplug the mjlj what does it run like? the same as what it runs like crap/ better/ worse?

http://www.autosportlabs.net/MJLJ_V4_Opera...he_Ignition_Map

Edited by Brett on 7th Aug, 2012.

Yes i moved to the darkside

Instagram @jdm_brett

Best advice I could give you is to remove your car from the garage where it is and take it somewhere else that won't risk damaging your engine!

Cheers guys, he has actually had it running at 96 at the wheels apparently but then it went dodgy on him.

I'm pissed off with him as he said "yeah no worries" when I asked him if he could do it, now he is telling me that I am wasting his time.

Car is being picked up on Thursday.

Anyone up North fancy helping me out getting the megajolt working properly if I pay for your fuel and time?

Edited by tomkidd on 8th Aug, 2012.

depending how far you have to go, you can run it on the coil pack, won't be great but it could get you home.

I've got a trailer so moving it isn't a problem.

I just need help getting it at a basic state of running so I can then take it somewhere without them having to trouble shoot.

Hi Tom

I'm running Megajolt on my mini. V3 mind you.

I've heard and seen maps get corrupt via the PC. but you should see that within the map.

Has the guy calibrated the TPS and stored the data.?

You should be able to get the car running just on the EDIS system. Just to test.

And it sounds to me that he's editing the map on the fly and not storing the changes. Hence it keeps reverting back.

Just some thoughts to try.

Si

Edited by Si P on 8th Aug, 2012.

I drill holes in everything..!

So, after having the car back in my own possession last night we decided to try my mate's laptop with a serial port on.

After making a few mistakes by not 'committing to flash' when we had switched maps around etc it seemed to work fine.

We were getting a few errors in the software saying that it couldn't get global settings or something but when we clicked OK it seemed to then let us adjust the settings.

So it seems like it might have been a user error in the fact that they were writing the map to the ECU but then not committing it to flash.

I've uploaded a map for now to do some testing.

Thanks for your help folks.