V7 Sti Maf Sensor info wanted

[Distrb]

Looking for the following info on the MAF sensor fitted to v7 Sti WRX's

- wiring pinout. IIRC its a 5 wire, so am thinking there is a 12v constant, an airflow signal, airflow earth, temp signal and temp earth, but i don't know for sure, and in what order are they?

- max readable airflow at their peak voltage?

If anyone can provide, or point me in the direction of information or wiring diagrams for such things that would be a massive help.

Cheers

D

[sti_v9]

You would have better luck with this question on NASIOC or IWSTI. Had a quick look on a few of the forums and this is what I found. I DONT KNOW IF ITS CORRECT AND ITS FOR THE MY05 MODEL but it should give you a starting point.

Also, from playing around with my V9 STI and I know that the MAF sensor reads up to 4.99v but the ECU MAF table is only mapped to around 4.69v. I'm at work now but when I get home I'll have a look at the ROM files and put up the MAF table so you can have a look at the airflow numbers.

Below is what I found on NASIOC.

checked your wire colors and here's what my 05 STI says for the same wires, maybe this will help ya:

-yellow w/blue stripe -> on a circuit with the fuel injectors, probably a power wire

-black w/ green stripe -> goes to ECM, ground

-white -> mine doesn't have a white wire listed.... on mine, this is pink with blue stripe and is the signal wire.

-brown -> intake air temp signal wire; goes to ECM

-green w/red stripe -> goes to "shield and sensor ground joint connector"

the white wire (if pin 3) is probably your signal wire. The wiring diagram also shows that this wire is shielded, unlike the other 4 wires in that same harness.

[sti_v9]

MAF airflow for a V7:

MAF (volts) Airflow (grams/sec)

0.94 1.31

0.98 1.50

1.02 1.71

1.05 1.94

1.09 2.19

1.13 2.47

1.17 2.78

1.21 3.12

1.25 3.48

1.29 3.88

1.33 4.31

1.37 4.76

1.41 5.26

1.48 6.31

1.56 7.49

1.64 8.80

1.72 10.20

1.80 11.79

1.88 13.52

1.95 15.40

2.03 17.56

2.11 19.95

2.19 22.63

2.27 25.62

2.34 28.93

2.42 32.47

2.54 38.33

2.66 44.93

2.77 52.20

2.89 60.07

3.01 68.57

3.13 77.68

3.24 87.56

3.36 98.37

3.48 110.08

3.59 122.69

3.71 136.19

3.83 150.67

3.95 166.20

4.06 182.84

4.18 200.64

4.30 219.70

4.41 240.02

4.49 254.21

4.57 269.09

4.61 276.81

4.65 284.70

4.69 292.74

[Distrb]

Mint, thanks for that.

Not really into subaru's so dont know of other good sites to look at. but that gives me a few more places to look.

cheers

D