hey, i already have a neo wired into my car but i just recently got a vpc. should i remove the neo and rewire it into vpc harness or could i just plug in vpc and leave the neo alone? also, the previous owner of the vpc had a afc wired into it but it looks to me like it was wired wrong- spliced wires dont match up to the wire pin diagram for the afc (well half of them dont match up anyway). so is there a difference in how u wire up neo into the vpc harness compared to the car harness? thanks for the help
afc neo on a vpc
- Thread starter supra_ed
- Start date
You want the AFC after the VPC.
If the wiring if obviously wrong, you should fix it anyway. Personally I wouldn't use any wiring someone else has previously done, 99% of the time it's hacked.
If the wiring if obviously wrong, you should fix it anyway. Personally I wouldn't use any wiring someone else has previously done, 99% of the time it's hacked.
Assuming the AFC is wired correctly. I also installed my VPC after I already had my SAFC. What I did was tap into the AFC wires close to the ECU harness. You only need to tap into Power+, Neg, and Rpm (I believe). Then your AFM signal wires should already have a connector(when the afc was installed, you had to cut that wire) I added the same type of connector to the VPC signal wire (Brown wire(double check manual)) So with that said. VPC signal OUT goes to S-AFC IN, S-AFC OUT goes to ECU IN. I'm talking about the output signal (converted AIT/Map signal)that the vpc outputs. Hope it didn't sound complicated. If you installed the AFC Neo yourself, it should be pretty easy.
supra_ed said:
What you normaly do with the S-AFC is cut the AFM signal wire, then the wire from the AFM(from firewall) goes to the SAFC IN wire, and the SAFC AFM OUT goes to the ECU. Now that the VPC creates that AFM signal on its own with the Air temp sensor and MAP sensor, there will be no AFM wire (from firewall) going to the SAFC anymore, therefore that AFM wire from firewall is not used anymore. Now the VPC then has an "AFM" output signal that it translate from the AIT and MAP that replaces the AFM wire (from firewall). That wire (brown wire) then goes to the SAFC AFM IN wire (previously connected to AFM wire from firewall no longer used) and the SAFC wire to car ECU stays the same.
ps. AFM wire from firewall means from engine bay in my explaination.
Hope that helps.
ok. i get how u just connected the vpc afmin/out wires to the existing cut afm wires (form the afc install), but wat about the rpm, throttle, power, and ground wires? did u leave those wires spliced into the car harness or did u undo and resplice into vpc harness? thanks for all the help man, i appreciate it.
supra_ed said:
These, I just tapped carefully into the S-AFC corresponding wires. I was'nt confortable about doing it at first, but I got reassured from a couple of wiring expert that it was fine. By doing it this way, I did'nt have to hack the main engine harness even more.