OBD2 ABA throttle body

[Prof315]

Well I can now confirm that an OBD2 ABA throttle body's built in IAC will work with MS3 and pretty darn well. BUT the duty values are far lower than I expected. I was running at 511Hz and with 1.7% DC idled at a steady 875rpm with 6* advance and ~15.2 to 1 AFRs. I suspect that bringing the advance up to 10* should get me to 925-950 with AFRs around 14.7.

[MancusoGTI8v]

I am going to install a MS3X on a 1.8T.

I am planning on using this:



Can you help me with the pinout?

Want to use TPS and idle control. I am assuming it is a PWM type idle control. Correct?

Thanks for the help.

[Prof315]

I have been meaning to update this.....
TPS pinout: Pin 4 is sensor ground. Pin 5 is sensor signal. Pin 7 is VREF (5V)

IAC pinout: Pin 1 is 12V Pin 2 is control (pwm)

Concerning the IAC portion of the throttle. It's weird..... although PWM control does work, it only works for me in open loop and I wound up wiring the valve backwards and using inverted control in MS. It _seems_ like the stupid thing is more like an electric temp door motor than a true pwm idle valve. That said I can still manage to idle the car steady at about 950 rpm with mine and it does catch the sudden increased engine load when I turn the air on pretty well.

[MancusoGTI8v]

Thanks!

Will document my install and post back here.

Luis