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How to produce a lambda sensor tester by yourself
andre79ge
10-04-2005
Basically, Fiat Uno lambda sensor produces a variable voltage in the range 0 - 1 V (in some cars there is another type of Lambda which produces 0 - 5 V voltage).<br />
When mixture is correct, tension is about 0.5V, if it is lower, it means a poor mixture, if it is higher, it means rich mixture
Old 28-04-2005   #15
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Re: Af

Oops, sorry for the confusion ppl.

I meant Air/Fuel. Actually I have the exact circuit already built as a Sound Meter but guess I do not use it so it is going as an Air/Fuel meter cause I really need one.

I will try the sensor that resides before the cat and we will see. Thanks again
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Old 02-05-2005   #16
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Something about the two sensors (on Punto mk2)

Hello!
In MK2 Punto there are two sensors: one before and one after cat.
Check the Lambda sensor BEFORE the CAT (near engine) if you want to check air/mixture value or if you want to check if the lambda/injection is working good.
The second lambda has a different usage.

Infact, if catalyzer is good, it uses oxygen in order to complete some chemical reactions (converts CO, NOX and some other stuff in chemicals less polluting, but I don't know the details). So, after a good catalyzer you will have a gas poor in oxygen, and with a composition in oxygen quite constant (the catalyzer is working, so it "burns" oxygen). Then, after the catalyzer, you will read a voltage with the same frequency of the first lambda voltage, but with a reducted amplitude (less oxygen and reducted variations in composition after the catalyzation).

If catalyzer is not good, it doesn' t acts the chemical reactions, then you will read the same values and amplitude both before and after the catalyzer.

Then, the meaning of the two lambda sensors is to keep in control the power of catalyzer.
Infact, EURO3 parameters are strong in terms of polluting emissions, and European men (cant' translate in English, however I mean politicians) estabilished a protocol, called EOBD (European On Board Diagnosys) which keeps in control all parameters of the car, including catalyzer.
Then, in case of some degrading, the yellow light on the panel of the car 'd turn on in order to point the attenction to the problem.

Ok, I hope to be helpful!
Cheers,
Andrea.
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Old 04-05-2005   #17
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Re: Something about the two sensors (on Punto mk2)

Thank you so much. I am building one right now, hope my camera works so that I can take some pictures.
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--- Punto mk2 8v---
*Int & Ext neons**Tinting**Int Alum trim**Momo gear set**Momo pedal set*
*Body graphics**Custom Ice install**Custom A'Pex Integration CAI**Sports exhaust**Racing Seat Belts**Removed seats**Lexan Windows**Weight reduction*
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Old 16-05-2005   #18
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Re: Something about the two sensors (on Punto mk2)

Sorry for the late reply.

I managed to build one of these, btw, those of you who cannot find the 3914 use the 3916, it will work just the same (mine uses a 3916).

The only thing I am worried is that when warm and I put my foot down only 6 leds light up max and the 6th led is barely on.
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--- Punto mk2 8v---
*Int & Ext neons**Tinting**Int Alum trim**Momo gear set**Momo pedal set*
*Body graphics**Custom Ice install**Custom A'Pex Integration CAI**Sports exhaust**Racing Seat Belts**Removed seats**Lexan Windows**Weight reduction*
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Old 06-06-2008   #19
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Re: Af

Quote Originally Posted by Neo-The Matrix View Post
Oops, sorry for the confusion ppl.

I meant Air/Fuel. Actually I have the exact circuit already built as a Sound Meter but guess I do not use it so it is going as an Air/Fuel meter cause I really need one.

I will try the sensor that resides before the cat and we will see. Thanks again
I HAVE A MK2 PUNTO BUT CAN ONLY FIND ONE ON THE FRONT MANNIFOLD CANT FIND ONE NEAR THE CAT ?
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Old 16-05-2009   #20
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Talking Re: How to produce a lambda sensor tester by yourself

do u know if the lambda sensor on a Seicento sporting fits the punto sporting 1.2 16v?
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