How to wire MAFT with SAFC

[oldschool85]

Here I made a quick guide to those who are running the MAFT with SAFC setup.

Keep in mind im using the 2nd Gen SAFC with an 87-88 7mgte harness. Those of you with 89+ please find the correct diagram for your year 7m.

http://img.photobucket.com/albums/v327/prettiboi717/Rebuild%20in%20Progress/maftsafcwireup.jpg

Here is the 87-88 diagram for those in need of it for reference.

http://img.photobucket.com/albums/v327/prettiboi717/Rebuild%20in%20Progress/ECU-pinout-87.gif

Now let me explain some of the wiring.

The maft sensor itself has 3 color coded wires. They are Black for ground, Pink for 12volts IGN, and Yellow for the Maf airflow frequency. Route these 3 back to the MAFT unit, the MAFT unit should already have these 3 exact wires there, solder them together or use a splice.

The MAFT unit itself contains 10 wires. The 3 you just connected and 7 others.
The other 7 are as follows:
Pink - Switched +12volt power source
Black - ground (E2).
Green - Airflow signal (KS).
Brown - Air temp signal (THA).
White - RPM signal, connect the line leading from the ECU to the igniter. It's called 'IGT'.
Gray - HAC simulator signal, Connect to HAC signal wire at glove box (optional)
Purple - this wire triggers the AUX dial when the unit is set to RPM mode. Switch 12 volts to this wire to enable the aux adjustment.

Now the SAFC contains several wires, you will only be using 7 wires. These are as follows:
Red-12volt IGN
Green-RPM
Brown-Ground closest to ECU
Black-Ground farthest from ECU
Pink-Karmann signal OUT
Orange-Karmann signal IN

Side NOTES: for the grounds on SAFC to be hooked up correctly make sure you connect BOTH Brown and Black Grounds to the same Ground (E2) wire. Just make sure that there is at least 1cm between them.

The tricky part of this installation would be wiring the Karmann signal. The KS signal comes from the MAF's Green Wire. This Green Wire should connect to the SAFC's Orange Input Wire. Then you take the Pink Wire on the SAFC and connect that to the ECU's KS wire. Locate this on the ECU pinout diagram provided above. Please make sure you cut this KS wire so the Pink Wire can connect to it sending the karmann signal to the ECU.

Hopefully this helps some of you out. If you have any questions please feel free to PM me. Have a nice day

Charlie

[williamb82]

good writeup, though i didnt think it was very hard to wire up. including taking the dash apart and wiring it up and puting it all back together it took about 30min. i putthe safc between the maft and ecu, so it interupts the maft signal for adjustments.

[oldschool85]

Thats exactly how its wired up above william. Some people arent that great when it comes to wiring. Hopefully this helps.

charlie

[williamb82]

i hope it does, looks like a good diagram. cant wait till the ms goes in, then ill have no use for the maft or safc2. hehehe also though, you forgot to add the +12 wire that doesnt cut out whe nthe ign is turned to bump the starter. if thats not hooked up the ecu gets no maf signal during that periode and it sounds horrible when it first starts if it even starts. i think it was b that had the 12vs on on and start key positions, though may have been +b

[83restomod]

not to randomly revive a old thread but can you use the maft gen 1 with out a SAFC or NEO controller? confused on what does what here. thanks

[SupraGuy31]

you can but you wont get the Upmost tuning capabilities. I ran on without the SAFC for a while and as long as you can dial the controller setting in while driving there isnt a problem. I put the safc in just for me security and for fine tuning.