94-95 & 96-97 MAF Delete Discussion - Page 5 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-02-2008, 04:38 PM   #81
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me too, but no code scanner :( If anyone has one they are willing to loan me for a few weeks it would help the cause significantly.

I put a 2.2K-ohm resistor between pin 3 & GND to simulate the AIT.

I also put the 1.5M-Ohm resistor between pin 4 & 5. This should have output approximately 1.4 Volts to the ecu.

*edit* Scott, you know anything about the programmable outputs on the MS? Is there a 0-5V programmable output? I know there are 12V switched, but I think our odds of success are higher with a variable output since the ECU was complaining about lack of "circuit activity" rather that "broken circuit". I think it actually wants to see the airflow vary :(
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Old 01-02-2008, 04:40 PM   #82
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any chance you can route you AIT through the MAF harness to try to rule it out? that should be sufficient it is for the 90-93 at least. then you can fiddle with just the MAF signal.
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Old 01-02-2008, 04:44 PM   #83
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any chance you can route you AIT through the MAF harness to try to rule it out? that should be sufficient it is for the 90-93 at least. then you can fiddle with just the MAF signal.
I could, but it would take a bit more time and effort. I ran independent wires for the AIT on the cold side. They are tucked into the other harnesses and are not very easy to access. I'd prefer not to re-wire stuff that is already functioning properly on the MS. I might buy another one to toss in there as an alternative for testing.
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Old 01-02-2008, 04:46 PM   #84
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can you at least tap the signal there into your harness? the ecu needs to share the ait signal. i know that.
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Old 01-02-2008, 04:56 PM   #85
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Sigh... then I have to change my bias resistance, redo easytherm, reflash again, etc etc. I'll see what I can do this weekend, but I may just buy a second sensor to tap in there.
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Old 01-02-2008, 05:11 PM   #86
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Sigh... then I have to change my bias resistance, redo easytherm, reflash again, etc etc. I'll see what I can do this weekend, but I may just buy a second sensor to tap in there.
If you want I will send you a sensor for testing. Its not a screw in, but its a rubber bung type and open element otherwise identical in every way to the screw in type.

You can send it back to me when you are done.

PM me your address, ill send it tomorrow.
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Old 01-02-2008, 06:51 PM   #87
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Address sent...
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Old 01-03-2008, 01:05 AM   #88
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Address sent...
Lol. Time to send thousands of AOL trial cd's to your house.




































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Old 01-03-2008, 09:27 AM   #89
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Not a wise idea...

*points out "gun toting Texan" under name*

Anyways... I went by the autoparts store yesterday and had my codes pulled. There were no stored codes at all since I last cleared them (~50 miles). I'm hoping that maybe the last one was a glitch since my O2 sensor was bad and tripped the CEL, maybe it just tossed in the MAF code for good measure?
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Old 01-03-2008, 11:05 AM   #90
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So are you or are you not getting a CEL?
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Old 01-03-2008, 11:58 AM   #91
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currently I am not... most of the time I do not... it keeps popping on 5 miles from the inspection station. One of the codes that kept comming up was the rear O2 sensor, so I replaced it. The one for the MAF was shown as (Pending) which means it didn't trigger the CEL, but was present. The fact it was there would keep me from passing emissions, CEL or not. ATM, there is not even a pending code for the MAF.... which is strange.
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Old 01-03-2008, 12:28 PM   #92
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Strange. So go get inspected like right now. But I think you know that if you reset the computer and dont put a certain amount of miles on it, it wont link up with the emissions computer at the station.
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Old 01-03-2008, 01:06 PM   #93
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I found this article pretty interesting... I read somewhere that we have a hot wire MAFS...this describes the function of our MAFS

http://www.wellsmfgcorp.com/pdf/Counterpoint3_2.pdf
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Old 01-03-2008, 02:28 PM   #94
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^ We already knew that. Thanks for playing

Arkmage, I sent you the sensor + a little something extra. Priority so you should have it fairly quick.
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Old 01-03-2008, 02:51 PM   #95
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You can buy a OBD scanner at walmart, keep the receipt and take it back when you get done. They have two nice ones.
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Old 01-03-2008, 03:31 PM   #96
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You can buy a OBD scanner at walmart, keep the receipt and take it back when you get done. They have two nice ones.
How much are they? We dont have walmarts in brooklyn :(
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Old 01-03-2008, 04:12 PM   #97
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You can buy a OBD scanner at walmart, keep the receipt and take it back when you get done. They have two nice ones.
might just do that... once I pass inspection I still plan to find a bypass so I can get that stupid hunk of useless plastic out of my engine bay.
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Old 01-30-2008, 10:37 AM   #98
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can one of you guys go back out and measure the resistance between 3 & 2. I'm trying to get the correct resistance values of the ECU so I can help you gets more accurate AIT values.....


please let me know what ecu 94-95 or 96-97
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Old 01-30-2008, 11:00 AM   #99
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can one of you guys go back out and measure the resistance between 3 & 2. I'm trying to get the correct resistance values of the ECU so I can help you gets more accurate AIT values.....


please let me know what ecu 94-95 or 96-97

? Won't that just give you the resistance of the AIT at whatever temp we are at? Do you also need to know the temp for this to be useful?

I'd be more satisfied if my damn coolant temp would read correctly. I'm at the point now that I'm thinking about adding a GM coolant sensor to the system and ditching the whole idea of sharing the stock sensor.

UPDATE: I'm lazy and busy and haven't made a lick of progress on the MAF issue. I ordered the parts from BEGi to stick my MAF back on the turbo inlet to pass emissions. After that I'll pull it back out and try again (when it's warmer out).
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Old 01-30-2008, 11:03 AM   #100
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Quote:
Originally Posted by Arkmage View Post
*edit* Scott, you know anything about the programmable outputs on the MS? Is there a 0-5V programmable output? I know there are 12V switched, but I think our odds of success are higher with a variable output since the ECU was complaining about lack of "circuit activity" rather that "broken circuit". I think it actually wants to see the airflow vary :(

The only available outputs are on/off type unfortunately. if there were variable outputs we would have some pretty cool options to play with
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