57 replies to this topic

[pete l]

Does anyone have the pin configuration for these sensors ?

[Steve220]

They're on.thr MPi wiring diagram and electrical manual

[pete l]

Is there an MPI wiring diagram here ?

[tmsmini]

In the first post:

 

http://www.theminifo...agrams-redrawn/

[minimans]

when checking voltage on signal wire you use the 5v supply wire to supply the the ground for the volt meter. if you don't you will get a constant voltage reading. Also confirm from the wiring diagram that you are in fact probing the correct wires for V+ V- and signal

[pete l]

Hi. Can't say I understood that.
But I have T4 kit and its telling me the same thing. My MAP sensor are doing bugger all.

[Bat]

Hi,

Usually an ECU would default to using the throttle position to get you home. Wether the rover ECU has this capability or not I've no idea.

The fact that you have a change with it unplugged would suggest the ECU is "seeing" the map sensor. However to have 3 sensors with the same fault seems unlikely, try a variable resistor as you suggested and see if you can change the kpa reading in live data..

Cheers 

[pete l]

Me again,

 

looking at the wiring diagram i find this 

 

 map wiring.jpg   30.17K   4 downloads

 

Who can tell me which wire does what, i know the pink is ground.

 

Is the red one or yellow one the 5v permanent supply ?

 

Thanks

 

Pete.

Edited by pete l, 01 June 2018 - 01:10 PM.

[pete l]

OK. So here we have a photo of all my MAP sensors

 1527928658788-50956190.jpg   61.08K   2 downloads

This is the T4 reading with no Map plugged in.

 15279287547901585031332.jpg   57.1K   2 downloads

First map plugged in, engine off, no change. Dead map, brand new

 1527928868050221727990.jpg   55.37K   2 downloads

Second map, engine off

 1527928961452316732300.jpg   59.08K   1 downloads

Third map, engine off

 1527929072585363104232.jpg   52.5K   1 downloads

Fourth map engine off

 1527929128976318060972.jpg   54.26K   1 downloads

5 volts direct to the signal wire

 1527929289019936365028.jpg   42.09K   3 downloads

1.3 volts direct to signal wire

 1527929370050-1784690228.jpg   48.91K   1 downloads


All views welcome. For me, this is total confirmation that all the map sensors I have are either dead or dodgy. None of them change. Value with the engine running or when a vacuum pump is used on them.
Can anyone be so unlucky ?
I'm pulling my hair out here.

Pete.

[pete l]

Anyone have a working MAP available ????

[mini13]

the third one looks to be in the right KPA range witht he engine off, and also seems to be a different sensor number.

 

I'd try that one witht he engine running, or get a suring on it and see if you can get a decent range out of it.

[pete l]

Hi, yes the third one is the closest, but still off.

The problem though is that they are all dead. They don't change value with engine running or with a vacuum pump. There must be something inside them that doesn't like getting old and gives up working.

 

I'm thinking about modifying it and putting a map from k series engines in it, after all, the MGF used the same MAP sensor as th mini when they came out.

[Bat]

Hi,

You could try a map sensor off an older Bosch efi system just find the pin specs connect it up and put your vac pump on it and see if you get a change in kpa in the live data. I used a Bosch Saab one I think. 

As long as it's got a pipe nipple on it and you can hook it up to the ECU you can prove ECU and wiring is working as it should be...

Cheers 

[pete l]

I think ECU wise, it's all ok. With 5 volts going to the ecu I get 108kpa, with 1.3 volts I was geting 40 odd kpa.

[pete l]

Me again. So I tried a t-map sensor from the rover k-series and guess what ? Yes it works. But maybe a bit low. Who can tell me if 86kpa engine off is too low ?

 IMG_20180610_111608.jpg   42.08K   1 downloads

 IMG_20180610_111624.jpg   55.54K   1 downloads

 IMG_20180610_111705.jpg   18.85K   1 downloads

Sucking on the sensor I can get the kpa down to 55.
I'm happy that car wise, everything is working as it should and that I have been really unlucky in buying new and second hand map sensors that are dead on arrival.

Thing is, I don't know what to do now. It doesn't look like the t-map sensor is compatible, seeing as I've only got 86kpa engine off. I might try making up an adapter to fit this and see how it drives.
I have sent the 2 brand new ones back to minispares for testing. Let's hope they can find me one that works.

Thanks all

A happy and very sad pete, who has just lost his mother from heart disease at the tender age of 89 ?????????