Author Topic: AFM voltage help for MAP conversion (Read 4636 times)

OKTAY · « **on:** May 15, 2009, 01:12:57 PM »

Well, I tried this in engine management section with no luck, maybe I should have posted it here first:
I'm about to purchase Map-Ecu piggyback (http://www.mapecu.com) from New Zealand to do the AFM to MAP conversion. I talked to the company and they asked some specific info. Since I live in Australia at the moment and my car is Istanbul/Turkey, I don't have a chance to provide this information myself...
They want me to check the voltage on the air flow (AFM) input with the ignition on and engine not running and also at idle so they can setup a table correctly.
Can any of you please provide me this information, so I can order?
Thank you very much in advance

OKTAY · « **Reply #1 on:** May 19, 2009, 11:12:21 AM »

Guys, please I'm still waiting. If any of you have a voltmeter, it's just a minute thing to find out this numbers...

Jimmy Lewis · « **Reply #2 on:** May 19, 2009, 02:36:54 PM »

Do you mean volts or ohms? I'm assuming they want the ohms of the potentiometer at those different times. Maybe I'm wrong, but if you can get back to me and tell me what you mean I'll go out and take down some numbers for you.

colin86325 · « **Reply #3 on:** May 19, 2009, 02:43:48 PM »

It's a 5V power supply. The spec is for .2 to .3V at idle.

This is from the repair manual--hopefully somebody can verify. I don't have a DVM to test it myself.

OKTAY · « **Reply #4 on:** May 21, 2009, 03:42:21 PM »

Quote from: Jimmy Lewis;72091

Do you mean volts or ohms? I'm assuming they want the ohms of the potentiometer at those different times. Maybe I'm wrong, but if you can get back to me and tell me what you mean I'll go out and take down some numbers for you.

Thank you Jimmy, I'll talk to them tomorrow to find out this volt and ohm issue. And I will post what they say...

Quote from: colin86325;72092

It's a 5V power supply. The spec is for .2 to .3V at idle.

This is from the repair manual--hopefully somebody can verify. I don't have a DVM to test it myself.

Oh yes, it works with 5V. Do you mean 0.2V when the ignition on and engine is not running and 0.3V when the engine is on idle?
Again thank you very much

colin86325 · « **Reply #5 on:** May 22, 2009, 09:15:43 AM »

AFM signal test:
Up/Uv value (Up = potentionmenter voltage, Uv = power supply voltage 5V) Indicates the voltage relation resulting from the sensor plate position in AFM. At idle speed the value shuld be 0.2 or 0.3; at full load it rises to 0.9. A value of ).02 is displayed when power supply or control lead has a break.

Note that they call it a "Up/Uv relation" so it sounds like this .2 to .3 is a ratio derived, rather than volts. So an Up voltage of 1.5 would result in a Up/Uv relation of .3.

Somebody please check this with a voltmeter.

fiftytakedowns · « **Reply #6 on:** January 06, 2010, 12:13:09 AM »

I found with testing multiple AFMS the number goes from 2 rising up to 6 then back down to 3 when its all the way open.