Need Help with SAFC on a 3VZ-FE Camry

[wontonjohnny]

hey guys .. anyone have the ECU pinout for my car??? im looking at the one in the haynes manual but i cant find the RPM signal wire, and im not sure which pin is for the Airflow wire and Throttle Position wire.

also what sensor type is my car??? my car has a AFM so would it be the Flap setting??

actually if anyone has already done this what are all the setting...haha thanks.

[mcelligott]

Flap, and ill get the other info for oyu as soon as i find my sheet i wrote down the ecu pin #'s on.

[Toysrme]

Time to get schooled! Class grab your Hayes book and turn to 12-25.

The 3vz-fe uses an airflow meter, but the flap part actually is a maf. Don't ask... It has wide and wild voltage changes, so it's kinda inaccurate to tune with hah! But it works and is easy enough to tune so don't bitch about it later on!!!

The ignition signal is the NE signal comming from the distributor C12. - black
The Throttle Posision Sensor is marked VTA B10. - blue
For the MAF, If I'm right you want to use the VS B2 - Yellow/Blue (Sorry I didn't write it down and I installed this in like.... March?)


Looking at the diagrahm:
THA = Intake Air Temperature
E2 = THA's ground
VS = Varriable voltage signal to the ECU
VC = 5v power supply comming from the ECU

[Toysrme]

btw once you get it working....




A really neat trick you can do once you have the tuning down is to swap from the TPS wire to the MAF. It's a bitch to tune innitially, because you obviously have to ahve the car running @ WOT for A piggyback unit to figure out what the top end is.

Once you get that done, tuning is smoother, and much more responcive.


Just a neat little tip

[wontonjohnny]

so C12 is the rpm signal???

i dont get what your saying by switching the TPS wih the Airflow wire, dont they both need to be hooked up???

[Toysrme]

Yep ignition is C12. It's the only Black wire on that connector.


I worded that poorly, but it's a simple and ingenious trick to do.
To measure engine load, don't use the 5v TPS signal. Instead, use the 5v MAF signal comming from the Airflow meter. The TPS just guesstimates how much air is comming into the engine. By using the MAF's signal, you get much better tuning in relation to engine load.

[wontonjohnny]

but on the SAFC wiring instructions your suppoesd to hook up both the TPS and Airflow/pressure wires anyways.

[Toysrme]

That is correct, but I don't think you grasp what I'm saying.

Once you're comfortably tuned, a great way to improve the smoothness, speed, and timing of fuel delivery is to swaped from using the Throttle Position Sensor to measure engine load, to using the MAF voltage to do so.





In other words, instead of changing fuel delivery when the throttle plate opens, you change the fuel delivery when the airflow actually changes. It doesn't sound like a major differance, but it makes a huge change to the smoothness of driveability.

[Luckynumber5]

I think he is asking how you would wire that, my giess is once the thing is tuned a bit switch the tps wire with the maf wire

[Toysrme]

Luckynumber5 if that's what he's asking then you've got it. Just understand once that is done you must retune the entire atleast to some extint.
I will say again, don't start out doing that. There are soooo many problems that can crop up when you install a piggyback, it can become hard to troubleshoot. Besides, ya might as well have the practice tuning it the crappy way.

[wontonjohnny]

ok let me see....

first hook up TPS wire to B10 and Airflow wrie to B2, tune it roughly.
then switch TPS wire to B2, and Airflow Wire to B10??

what kinda sensor is it after you do the switcharoo?? still flap???

[Toysrme]

No no no no no no no. Look I'm going to draw it and if ya don't get it, just forget it until you understand how your piggyback works. Then it'll be obvious why this way is better.

Here is a picture of how the normal setup works:
The crank signal is T'ed into and goes to both the SAFC and ECU
The TPS signal is T'd and into and goes to both the SAFC and ECU




Here is how a TPS signal is replaced by the MAF sensor, for better engine control:
The crank signal is T'ed into and goes to both the SAFC and ECU
The TPS signal is NO LONGER USED. It is T'ed into the MAF output and used in the place of TPS on the SAFC and ECU.
The MAF output signal (used to control fuel) is intercepted by the SAFC, manipulated, then sent to the ECU.






*edit* Sorry.... Paint made it a small picture.
The colors are correct and correspond to wire color with all '92-'93 3vz-fe I have come across on USDM Camry/ES 300's.
Green = ECU
Black = Crank Signal
Blue = TPS
Yellow w' Blue stripe = MAF Output
Red = SAFC

[Toysrme]

btw, what I'm talking about works *extremely* well if you also swap the AFM for a Supra MAF. Before anyone get's ideas.... You gotta have some kind of programmable tuner to get the Supra MAF to work.

[wontonjohnny]

ok.. kinda get it now... jsut to make sure... which wire do you move the TPS line too on the AFM??? do I Tee it to VS (2B) or VC(1B)???

[wontonjohnny]

also the blue wire form the safc is for O2 right?? which wire should i use for that???