ZPmadA

Car: 1986 944 Turbo
MAF: Autothority

I'm about to finish this up with heat shrink and solder. Could you guys take a look at my Autothority MAF harness? My original harness was ripped apart by my headlights and I would like to make sure I got the wiring right. Is this how Autothority wires their MAF?



Nothing is plugged into the #9 socket?

PorscheDoc

Yup looks good. I have one here out of a customer's car that we upgraded to a Vitesse Maf. Nothing connected where #9 would be on this one either.

ZPmadA

Ok,
I have it wired up and plugged in except I forgot which hole in the "diagnostic port" I put that red wires pin into. I have attached what looks like the diagnostic port and hopefully someone with an MAF can pop open the black cap, and take a look which hole I should put my red wire in. The actual "diagnostic port" isn't labeled 1, 2, 3, 4, or 5. Those are numbers I made up. Let me know what each number does and what happens if I plug it into the wrong one.

note: I'm not sure that black thing is called the "diagnostic port". It can be found on the driver side between the windshield and the driver's side strut mount. It is much smaller than the one in my picture, and has a black plastic cap that needs to be opened to see the pin holes.

fast951

You are not grounding the sensor. You have 2 grounds, Power GND and sensor GND. I see the sensor ground missing.

CPR

Wiring is correct...should be hole #4. It is pouring rain here, give me a sec and I'll run and check. As far as the grounds go I'll check that also...but you have everything I have on mine.

CPR

Sorry I meant it should be #3...I'll run out and verify....

ZPmadA

How do you know the sensor isn't grounded, where should I look? I should have two black wires coming out of the MAF plug?

CPR - Let me know. You have an autothority maf? I was thinking 1 (the first plug closest to the passenger fender). Number 4 is the first plug closest to the driver's side fender.

fast951 - Would you know which plug in the diagnostic port?

Here is what I found on a different thread:
What would happen if I plug it into the wrong spot?

CPR

The holes and not exactly laid out like you have them drawn but it appears to be your number 3. If you have a voltmeter, check the voltage of port 3 with the key off (should read 0) then with the key in the on position (don't start the car) it should read 11-13 volts. That ensures you are in the right one.

CPR

yes, I have the stage 2 chipset and tha mass sensor and intake from Autothority.

sebastian944

I have that too

ZPmadA

Did some more searching and found this, but it doesn't quite match what CPR is saying:
This image seems to show 1 as the power supply.

More searching and another quote:

So it seems like the 12v power supply is 1 in my picture. CPR isn't using 1 and has an autothority maf. Is it possible he is using the 5v power supply and that autothority requires a 5v supply?

ZPmadA

UPDATE: Just got back from driving. Those two images in my last response are correct. Car is running great.

CPR - Maybe you are using the 5v supply?

fast951

You are missing the signal ground wire on the connector. This may be the way APE did it, hopefully they grounded it internally to the sensor..

CPR

I'll upload some pics when I get off work today. I am not in a 5v slot as the MAF will not function on voltage less than 10v. Also mine is hardwired to the wire that formerly went to that port, as you will exp. some problems later on with the contacts. Get back to you.