How to check MEMS 1.9 Map sensor
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Not many rules really, this board being aimed at technical issues, it shouldn't fall foul (hopefully) of some of the more personal issues that can affect forums.
Rule 1 - Is that you need to think very carefully before posting anything technical or asking anything technical relating to the security system of the car - See 'Security Issues' sticky for more info.
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Because advice is honestly and freely given in this technical section, much of it will be amateur experienced based, so any information is given in good faith and is not guaranteed as correct.
Not many rules really, this board being aimed at technical issues, it shouldn't fall foul (hopefully) of some of the more personal issues that can affect forums.
Rule 1 - Is that you need to think very carefully before posting anything technical or asking anything technical relating to the security system of the car - See 'Security Issues' sticky for more info.
Rule 2 - We (MGF Register) do not support copyright infringement and therefore references to CD ROM, PDF versions or paper copies of the workshop manual (for instance) should not be posted on the forum. We don't want to get into trouble and we'd rather sell you a genuine hard copy through our Regalia shop anyway!
Because advice is honestly and freely given in this technical section, much of it will be amateur experienced based, so any information is given in good faith and is not guaranteed as correct.
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Phil Brook
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- MGF Register Region: Somerset & Dorset
- Model of Car: MGF
- Location: Corfe Mullen. Dorset
How to check MEMS 1.9 Map sensor
Does anyone know how to check the function of a mems 1.9 map sensor without the aid of a reader? Is there somewhere i can monitor an output change?
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Phil Brook
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- Joined: Thu Sep 10, 2015 7:58 am
- MGF Register Region: Somerset & Dorset
- Model of Car: MGF
- Location: Corfe Mullen. Dorset
Re: How to check MEMS 1.9 Map sensor
Thanks Bob.. that is an awesome site.. nothing on there about the ECU onboard map sensor.. and if it's not on there I think I'm going to struggle 
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Phil Brook
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- MGF Register Region: Somerset & Dorset
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- Location: Corfe Mullen. Dorset
Re: How to check MEMS 1.9 Map sensor
Ahh, found the pin out for the ECU, also on that excellent site, but nothing on there for the MAP sensor.. I guess it does all it's jiggery pokery within 
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talkingcars
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Re: How to check MEMS 1.9 Map sensor
Like I asked on the other thread - do you have a vacuum line between ECU and inlet manifold?
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Phil Brook
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- Location: Corfe Mullen. Dorset
Re: How to check MEMS 1.9 Map sensor
Yes, it's in good condition with no leaks. I wasn't sure what the black box was on the side of the engine bay, inline with this, as it didn't appear to do anything but I am assuming it is a flame arrester to stop any back fires getting to the ECU.
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Charless
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Re: How to check MEMS 1.9 Map sensor
'vapour trap' sounds less dramatic!
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Phil Brook
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Re: How to check MEMS 1.9 Map sensor
I like a bit of drama Charles
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Rob Bell
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Re: How to check MEMS 1.9 Map sensor
Maybe apply a vacuum to the hose with the engine running, it should result in a change of idle speed...?
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Phil Brook
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- MGF Register Region: Somerset & Dorset
- Model of Car: MGF
- Location: Corfe Mullen. Dorset
Re: How to check MEMS 1.9 Map sensor
Oh, thought I'd responded to this earlier.. yes, have tried that but difficult to see if it made a difference. Certainly didn't seem to have any effect on the revs. But may have changed the fuelling.
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Rob Bell
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Re: How to check MEMS 1.9 Map sensor
Ideally you need a diagnostic reader - it certainly makes this sort of thing a lot easier! Shame you're not closer...
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Phil Brook
- Posts: 58
- Joined: Thu Sep 10, 2015 7:58 am
- MGF Register Region: Somerset & Dorset
- Model of Car: MGF
- Location: Corfe Mullen. Dorset
Re: How to check MEMS 1.9 Map sensor
Thanks for all the help... I bought a second hand ECU and 5AS and it cured the problem. Emissions are now ok and even the pesky surging idle has gone.