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Technical map sensor expected resistance

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Technical map sensor expected resistance

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jonny2shotti

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hi all,

im new here and hoping to find someone like myself that likes to know a part is truly faulty before replacing it.

i have a 2006 1.2GP. can anybody tell me what resistance i should be expecting to measure from the MAP sensor at tickover and under load please?

any help will be gratefully received.

thanks in advance,
Jonny.
 
jonny2shotti said:
hi all,

im new here and hoping to find someone like myself that likes to know a part is truly faulty before replacing it.

i have a 2006 1.2GP. can anybody tell me what resistance i should be expecting to measure from the MAP sensor at tickover and under load please?

any help will be gratefully received.

thanks in advance,
Jonny.
Click to expand...

Hi,
Welcome to Fiat Forum.
As far as I'm aware the MAP does not have a resistance type output. Additionally you can't measure resistance with it connected. The easiest way to measure the signal is with Multiecuscan www.multiecuscan.net
You also need a ELM 327 interface (get a "modified for Multiecuscan" USB one) total cost including registration (play with the "free" unregistered download first) is lest than one diagnostic read by a dealer.


Robert G8RPI.
 
Robert is right (as usual), you should read a voltage for the pressure part of the MAP sensor, but there is also a NTC in there to measure the air temperature, and on that pin you should read resistance. I attached the curves for reference, they might not Apply to your specific model but should not vary much.

Ooops, by the way, welcome on board !!

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 

Attachments

  • map sensor curves.JPG
    map sensor curves.JPG
    43.5 KB · Views: 26
  • MAP sensor table Punto 1.4 16V.JPG
    MAP sensor table Punto 1.4 16V.JPG
    38.8 KB · Views: 30
  • MAP Operation Punto 1.4 16V.JPG
    MAP Operation Punto 1.4 16V.JPG
    103.3 KB · Views: 27
  • MAP sensor specs.JPG
    MAP sensor specs.JPG
    29.9 KB · Views: 21
  • Sensors head GP 1.2 8v.jpg
    Sensors head GP 1.2 8v.jpg
    41.8 KB · Views: 20
Last edited:
thank you very much guys, thats exactly what i needed. i do have the fiat specific cables in the post to adapt my vag kkl cable to work, i was just trying to gather as much info as possible before i get into it.

you have both been very helpful ?

Jonny.
 
jonny2shotti said:
thank you very much guys, thats exactly what i needed. i do have the fiat specific cables in the post to adapt my vag kkl cable to work, i was just trying to gather as much info as possible before i get into it.

you have both been very helpful ?

Jonny.
Click to expand...



Hi,
Unfortunately the KKL interface won't work on the GP. It's CAN only so you need the ELM 327 or similar. You can check the requirements here
http://www.multiecuscan.net/SupportedVehiclesList.aspx


Thanks Bernie for the tables and info on the temperature sensor. I wasn't sure if the OP's car's MAP had one so didn't mention it. I'm more familiar with the multijet which does have an temp sensor but I don't like to assume too much.


Robert G8RPI.
 
hi Robert,

if it doesnt work i will run it on the ds150e. that will show me what the map is doing, but i was assured that the fiat adapter plugs i bought would work with the kkl lead. i will try them and report back on friday ?
Jonny.
 
Here's how the OBD plug (R010) is wired; CAN only … You'd need a wiring converter AND a protocol converter, which BTW might be built in your reader…

While talking about reader: a cheap bipolar inverter and a few wire cuts&adds will replace the "Yellow Plug" adapter to read other than Engine & ABS nodes !

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 

Attachments

  • OBD wiring.JPG
    OBD wiring.JPG
    57.4 KB · Views: 11
Last edited:
hi Guys,

you were correct, the kkl lead was no good and i have ordered an elm327 interface. in the meantime, the ds150e worked fine and showed no issue with the map sensor. i have a random misfire on cylinder2. i suspect the issue could be a break in the wiring. i have tested the loom on the injector rail and all is well there.i want to test from the plug from the rail to the ecu. can either of you tell me which pin numbers on the ecu plugs correspond to the injectors please?

thanks,
Jonny.
 
just incase anybody searches this and requires an answer, its pins 47, 48, 63 and 64. found them by process of elimination
 
WRONG !

Those pins ar for the ignition coils !!

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 

Attachments

  • Engine Elec Diag 1.4 Tjet 2.JPG
    Engine Elec Diag 1.4 Tjet 2.JPG
    137.3 KB · Views: 20
jonny2shotti said:
hi Guys,

you were correct, the kkl lead was no good and i have ordered an elm327 interface. in the meantime, the ds150e worked fine and showed no issue with the map sensor. i have a random misfire on cylinder2. i suspect the issue could be a break in the wiring. i have tested the loom on the injector rail and all is well there.i want to test from the plug from the rail to the ecu. can either of you tell me which pin numbers on the ecu plugs correspond to the injectors please?

thanks,
Jonny.
Click to expand...


Hi,
There have been reported cases of intermittent contact in the injector connectors. If you can extract the contacts gentle reshaping can help. Resistance checks from ECU end while wiggling the injector plugs can show if this is the issue.


Robert G8RPI.
 
Bernie if those pins are wrong, why would i be getting a circuit from D081 to those pins?

Thanks for the diagram, i will retest the other pins tomorrow.

Also thanks, Robert. i will check the connection on the injector in cylinder 2 also.

Jonny.
 
Sorry sorry sorry Jonny !

The drawing I sent is for the 1.4 engines, here are the ones for your 1.2 8V. They are pretty much identical but the pin numbering, which by the way doesn't correspond to what you posted …

BRs, Bernie
 

Attachments

  • Engine controls 1.2 8V 1.JPG
    Engine controls 1.2 8V 1.JPG
    143.1 KB · Views: 11
  • Engine controls 1.2 8V 2.JPG
    Engine controls 1.2 8V 2.JPG
    124.2 KB · Views: 14
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