Author Topic: IAC PWM Output  (Read 6229 times)

Offline og

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IAC PWM Output
« on: February 03, 2021, 10:02:59 pm »
Hi
I finally set up my Mercedes M119 engine with a VEMS. It´s running now quite good but I´m facing the problem with idle.
My setup is a 2 wire Bosch soleniod. Since I have only 4 ignition outputs, I used EC18-Pin 17 to control via pwm.
Am I right with my considerations that this won´t work.
Should I use one of the logic level outputs instead?

Best regards
Olli

Offline Kamuto

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Re: IAC PWM Output
« Reply #1 on: February 05, 2021, 10:32:14 am »
it should work I think, anyway logic level ones wont work, but you always can add aditional IGBT in the ecu, just it will require flyback diode for it.
Vems installer in Lithuania
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Offline og

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Re: IAC PWM Output
« Reply #2 on: February 05, 2021, 10:55:16 am »
thanks for the reply Kamuto,

I use a diode on the soleniod allready like this 



is there a how to to add an additional IGBT

Olli

Offline og

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Re: IAC PWM Output
« Reply #3 on: February 14, 2021, 02:57:49 pm »
Got it solved, I add one more IGBT and use this output for drive the IAC.

Olli

Offline LuddeNo1

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Re: IAC PWM Output
« Reply #4 on: November 17, 2023, 04:21:44 pm »
HI.
How did you do with the triggerwheel and cam-sync on the m119?

Offline Kamuto

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Re: IAC PWM Output
« Reply #5 on: November 18, 2023, 08:12:57 am »
HI.
How did you do with the triggerwheel and cam-sync on the m119?
I guess it needs some external trigger wheel, unless you have some info or scope of it's crank signal
Vems installer in Lithuania
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Offline LuddeNo1

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Re: IAC PWM Output
« Reply #6 on: November 18, 2023, 10:53:50 am »
I have a m119 with vems but don't know who installed it and it uses the stock triggerwheel but no cam-sync is configured and the config is like this having issues to start but once it started it runs ok.