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Old 25-05-2011   #31
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Re: P0105 & p0340

I really appreciate your patience Decks. Do i just connect the other probe to any earth source or do i have to connect it to a certain position?

I want to test the MAP sensor as thats easier to check first.

A previous post says :
Pin 1 - 5V
Pin 2 - Air Temp
Pin 3 - Earth
Pin 4 - MAP signal

But the wiring diagram is:
A - Earth
B - Air Temp
C - MAP signal
D - 5V

If i only need pin D and an earth source then thats ok and i'll figure it out from there. Its bank holiday weekend so i think the only time i'll be able to work on this is sunday.
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Old 26-05-2011   #32
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Re: P0105 & p0340

The previous post was for a 1.2 engine type MAP where the pins have numbers

Your pins are lettered so yours is as the wiring diagram
A - Earth
B - Air Temp
C - MAP signal
D - 5V reference

Battery earth will be fine for comparing to earth as your other probe contact

MAP signal will be around 4.5v with ignition on and engine off but really you just want to check if the 5v reference is there then go on to check it is arriving the same at the CMPS
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Old 28-05-2011   #33
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Re: P0105 & p0340

So i woke up 7am to try and investigate and its started raining. Great. Anyways, i've tested the MAP sensor and there's definately no 5v getting through. Its just 0.01v. The rain has put me off from getting under the car again but because theres no 5v going to the MAP, what should be next on my checklist?

You mentioned checking the earth shield wire. As usual i don't have a clue where that is so could you point me in the right direction...

The eLearn cd hasn't helped much as although its full of information, i don't actually know what i'm looking for!
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Old 28-05-2011   #34
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Re: P0105 & p0340

If there's no 5v getting through to the MAP then forget the shield wire, no 5v supply will be the cause of your problems as that also feeds the CMPS. So really double check for the 5v supply, back probe with engine running because if there's no 5v then there's an ECU or ECU connector pin problem
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Old 29-05-2011   #35
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Re: P0105 & p0340

Double checked again this morning and there is definately no 5v getting through. I must of disconnected the sensor on my last check because when i went to check it this morning, it was unplugged! When i plugged it back in, the initial start up was very lumpy, engine almost cutting out several times before settling to normal idle.

Is there anything else i can check?
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Old 29-05-2011   #36
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Re: P0105 & p0340

Yes your 1.2 will complain bitterly if there's no MAP connected

Really no need to check anything else, if you're sure you dont have 5v at the MAP then that's the reason why your car is complaining about MAP and CMPS sensor as they both have the same supply

So the next test would be see if there's 5v coming out of the ECU intended for the MAP if not then it's either ECU repair or a refurbished one
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Old 30-05-2011   #37
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Re: P0105 & p0340

Quote Originally Posted by Deckchair5 View Post
Yes your 1.2 will complain bitterly if there's no MAP connected

Really no need to check anything else, if you're sure you dont have 5v at the MAP then that's the reason why your car is complaining about MAP and CMPS sensor as they both have the same supply

So the next test would be see if there's 5v coming out of the ECU intended for the MAP if not then it's either ECU repair or a refurbished one
Point me in the right direction and i'll do my best! I still love my Stilo but am slowly falling outta love with it...
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Old 31-05-2011   #38
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Re: P0105 & p0340

Well it gets a bit harder as you want to test for any breaks or damage in the wire from the ECU to the MAP and CMPS. So you'd need to find the wire in ECU connector B pin 13 colour H =grey. You'd need to back probe it or pierce the wire or remove the tiniest bit of insulation to gain access to the wire so that you are able to test it whilst it is still connected. You never know, with luck you may find your 5v there and then it's a not too difficult task of finding the break in the wire.

With everything switched off and the ECU B connector removed, check for bent pins around that pin 13 area and look for a pin that's a different height than the rest

If there's no 5v to be found then there is an ECU internal fault

Heads up for you too
NB Fiat's wiring diagram is wrong. It shows the 5v supply to be at pin D whereas that's the MAP sensor signal. 5v supply is grey wire on pin C


Click image for larger version

Name:	 <a href='http://www.fiatforum.com/autolink.php?id=15&script=showthread&forumid=33' target='_blank' title='Manifold Absolute Pressure' class='gal'>MAP</a> sensor correct wiring pinout 1.6 K43 .JPG
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ID:	91128
Best to go from this pinout diag for MAP sensor K43 which is correct, showing 5v supply on grey wire pin C and MAP signal on pin D green wire

You should have
A white Earth
B white/ Air temp arouind 3.3v at 15C
C grey 5v supply
D green map signal -around 4.5v with just key to MAR maybe down to 1.5v at tickover
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Last edited by Deckchair5; 31-05-2011 at 09:11.
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Old 31-05-2011   #39
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Re: P0105 & p0340

I always thought there was something wrong with the colours but i was too afraid to ask!

Anyways, with the colours corrected, there is 0.14v going to the map sensor and the reading at the ecu connector b, pin 13, is the same at 0.14v.

I guess my options are rather limited as what to do next. A straight swap ecu isn't going to work is it...
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Old 01-06-2011   #40
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Re: P0105 & p0340

Ha! Yes, I've been looking at the Fiat wiring diagram and been thinking for some time "That can't work but then again it must work" . Very common for the wiring diagram colours to be wrong but for the wiring diagram to show the wrong pins is a bit spectacular.
Click image for larger version

Name:	 <a href='http://www.fiatforum.com/autolink.php?id=15&script=showthread&forumid=33' target='_blank' title='Manifold Absolute Pressure' class='gal'>MAP</a> sensor correct wiring 1.6 K43 .JPG
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Size:	20.4 KB
ID:	91164
So here is how the wiring should look (note my rearrange of letters on the MAP) as it all gets very confusing if we are referring to a wiring diagram that is wrong in the first place

The fact you getting a voltage, even though its a wrong one, shows that you have a circuit of some kind there. Absolutely no voltage would indicate an open circuit

Next thing I'd check is whether 5v is arriving at a completely different component in the system ie "Is the ECU creating 5v and supplying it to any other components?" I would think it was so do you have air con?
Click image for larger version

Name:	pressure stat connector.JPG
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ID:	91165
If so then 5v is supplied to the pressure stat or linear pressure swtich as they like to call it and it's quite easy to reach down, disconnect the connector and pull it up to inspect from the topside. So looking at the 3pins there will be 5v, signal and earth (signal is the pin in the middle) so is there 5v arriving here?

Regarding fitting a different ECU then you would need to have one that is virginised ie chip set to factory blank
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Old 01-06-2011   #41
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Re: P0105 & p0340

My car does have air con but its very intermittent. It works when it wants to. Normally only when the engine has warmed up but then, it still doesn't always work. I have a malfunction code for the air con too but i'm ignoring it as the engine issue is more important!

Erm... Where's this new switch...?

Cheers decks. I'll check that out very soon.
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Old 01-06-2011   #42
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Re: P0105 & p0340

Could be the one down on one of the pipes which goes
in and out of the condensor radiator at the front
of the car.

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Old 01-06-2011   #43
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Re: P0105 & p0340

My car does have air con but its very intermittent. It works when it wants to. Normally only when the engine has warmed up but then, it still doesn't always work. I have a malfunction code for the air con too but i'm ignoring it as the engine issue is more important!

Ha! Now you tell us Probably just low pressure, what fault code is it?

Click image for larger version

Name:	linear presssure switch.JPG
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Air con pressure stat is down here ( see the connector spring catch behind the pipe in the pic?) but you can reach it from top side, standing at front of car, reach down the lh side of radiator and it's at the bottom, spring catch on the side of the connector, release wiring from harness clip and it's easily long enough to view from topside as shown in photo above

When you check for 5v at the pressurestat then check again for 5v at the MAP whilst the pressure stat is disconnected just to see if the pressurestat is dragging the voltage down
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Old 01-06-2011   #44
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Re: P0105 & p0340

If the presure sensor is giving a low reading because its faulty and you've checked the presure is correct manually with a gauge, is there a way to engage the clutch on the pump?
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Old 01-06-2011   #45
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Re: P0105 & p0340

Sure, just simulate a good pressure with a voltage midrange between 5v and 0v down the pressurestat signal terminal. Two resistors joined together and a midpoint take off to give a voltage split of 2.5v will do the job but don't install permanently as high pressure sensing is needed to turn off compressor and switch on the rad fans
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