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Checking a Wide band O2 oxygen sensor operation


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#1 Agent 34

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Posted 18 May 2018 - 06:40 AM

Guys,

 

have a FAST air and fuel which i planned to sort out last year and because of minor issues , smash and engine big end didn't get around to sorting out.

 

it's a second hand unit and have not tried to run in the car . I was tying to test the O2 sensor and have watched a few videos on you may tube and have tried this method but no luck with the readings. this involves heating the o2 sensor and then reading the DC current .

 

if there any other way to test this - the car is not running at the moment but need to sort with the new motor to tune and check A/F 

 

http://www.fuelairsp...gle-sensorhtml/

 

 



#2 Rockoz

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Posted 18 May 2018 - 09:54 AM

Looking at what I quickly looked at, this is what I have worked out.

The sensor is connected to 12V which gets the element up and running in it.

If it doesnt heat up you have a problem.

The sensor sends a voltage back to the computer as a means of telling the computer what the A/F ratio is.

 

First step would be checking that the thing heats up.

Try to identify the output pin of the sensor and hook the multi meter up to theis pin and ground.

Watch the voltage.

Spray some flammable product at the sensor and watch the voltage to see if it changes.



#3 caterham2

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Posted 18 May 2018 - 12:06 PM

 

Looking at what I quickly looked at, this is what I have worked out.
The sensor is connected to 12V which gets the element up and running in it.
If it doesnt heat up you have a problem.
The sensor sends a voltage back to the computer as a means of telling the computer what the A/F ratio is.
 
First step would be checking that the thing heats up.
Try to identify the output pin of the sensor and hook the multi meter up to theis pin and ground.
Watch the voltage.
Spray some flammable product at the sensor and watch the voltage to see if it changes.

 
I have a LM 2 wide band meter, the sensor needs to be heated by 12 volt and then you need to calibrate it in "free air" for a baseline reading. I would imagine your meter although a different make would operate in a similar fashion.

 

Looking at what I quickly looked at, this is what I have worked out.
The sensor is connected to 12V which gets the element up and running in it.
If it doesnt heat up you have a problem.
The sensor sends a voltage back to the computer as a means of telling the computer what the A/F ratio is.
 
First step would be checking that the thing heats up.
Try to identify the output pin of the sensor and hook the multi meter up to theis pin and ground.
Watch the voltage.
Spray some flammable product at the sensor and watch the voltage to see if it changes.

I have a LM 2 wide band meter, the sensor needs to be heated by 12 volt and then you need to calibrate it in "free air" for a baseline reading. I would imagine your meter although a different make would operate in a similar fashion.

#4 koalasprint

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Posted 18 May 2018 - 02:30 PM

I have just purchased the Innovate DLG-1. Here is the manual if it helps.

 



Doco here

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#5 jd lj

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Posted 18 May 2018 - 07:01 PM

If you power up the unit with the sensor out of the exhaust it should read 20.9 AFR, this is what the Innovate lm-2's after there free air calibration.

My new AEM AFR gauge reads 18.9 when it's powered up (sensor in exhaust) and the engine not running.

Grant have you googled "Fast AFR meter instructions"? I'd expect them to be online somewhere.

#6 Agent 34

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Posted 18 May 2018 - 07:38 PM

Yes it's funny the FAST guys really dont have a lot on line for my model as itwas one of the first, they seems to have gone into self learning EFI systems and a lot more complex. I will do some more searching online and will see if i can get a " heated " reading out of it in clear air tomorrow. I was always going to put a bung in the GTR but never got there.

 

they do have a community forum but it seems to be a lot more technical with the EFI management side.

 

there was a two page instructions and i will re read this again and see if i can get a reading or at least calibrate prior to starting the engine on monday night.






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