1.8 MAF wiring diagram help
Hi, I am trying to use a spare 1.8 MAF sensor I have in my garage for my Mechanical Engineering controls project. I can not find a wiring diagram to find the pin out for the sensor. Does anyone know the pins?
Were using it to create a PID feedback controller for a dynometer fan for my School's FSAE team |
4 Attachment(s)
Pinout varies by year.
For '94-97, wherein the IAT sensor is integrated into the MAF assembly: https://www.miataturbo.net/attachmen...1&d=1393383265 Wherein: W/R = 12v R/B = IAT R/W = MAF (0-5v) B/L = signal ground B/LG = power ground For '99-'05: https://www.miataturbo.net/attachmen...1&d=1393383265 Wherein: W/R = 12v LG/B = MAF (0-5v) B/L = ground |
https://www.miataturbo.net/megasquir...n-14166/page5/
I found this thread and put 12V to pin 5 and grounded pin 1 and used a DMM to read the voltage between 2 and 4 but am getting 0 volts. |
Originally Posted by cyotani
(Post 1106257)
https://www.miataturbo.net/megasquir...n-14166/page5/
I found this thread and put 12V to pin 5 and grounded pin 1 and used a DMM to read the voltage between 2 and 4 but am getting 0 volts. Re: your most recent test: Did you expect something other than 0v at the output with no airflow? (While the mechanical airflow meter in the '90-'93 cars scaled from 5v = no airflow to 0v = maximum airflow, rest assured that the hotwire MAF sensors in the '94-'05 cars scale "properly," wherein 0v = no airflow and 5v = maximum airflow.) |
Originally Posted by Joe Perez
(Post 1106259)
Re: the thread you linked to- know that there was a lot of misinformation floating around back then.
Re: your most recent test: Did you expect something other than 0v at the output with no airflow? (While the mechanical airflow meter in the '90-'93 cars scaled from 5v = no airflow to 0v = maximum airflow, rest assured that the hotwire MAF sensors in the '94-'05 cars scale "properly," wherein 0v = no airflow and 5v = maximum airflow.) I have a household fan and am measuring voltage with it off and with it blowing full blast into the MAF. I think that should be enough airflow to get a reading on my DMM but nada |
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This is how I have it wired at the moment. red alligator is +11.55 from a battery and yellow is the battery negative terminal. 2nd pin from left is DMM ground and 4th from the left is DMM positive. (I made sure I have clean connections to the pin without the two adjacent alligator clips touching). Still no voltage regardless of airflow.
https://www.miataturbo.net/attachmen...ine=1393386092 https://www.miataturbo.net/attachmen...ine=1393386092 |
This says far left is ecu ground (signal ground). but either way I still get 0 V regardless of airflow.
How to Test a 1995 Mazda Miata Mass Air Flow Sensor | eHow Nice write up by the way Joe! AFM Removal from the 1.6 liter Miata using eManage Ultimate |
Just a quick note as I hop on the train- you should probably ground both MAF grounds to the same point, and take your measurement relative to that combined ground.
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Originally Posted by Joe Perez
(Post 1106328)
Just a quick note as I hop on the train- you should probably ground both MAF grounds to the same point, and take your measurement relative to that combined ground.
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Originally Posted by cyotani
(Post 1106374)
Okay, so the sensor ground and power ground should both go to the negative battery terminal and use a DMM to find the voltage from common ground to the sensor output 0-5V?
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Originally Posted by Joe Perez
(Post 1106406)
That's the idea.
Worked like a charm! Thank you for the help good sir! Electronic circuits is not my strong point. But now that I think about it common ground makes sense. I should known that one. Now on the PID portion. Should be a fun project. https://www.miataturbo.net/attachmen...ine=1393469057 |
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Originally Posted by cyotani
(Post 1106711)
Worked like a charm! Thank you for the help good sir!
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