IAC output/s to control 3-Wire Idle Valve?

This is a forum for discussing the development and testing of alpha MS2/Extra code. Documentation
(Runs on MS2 and Microsquirt)

Moderators: jsmcortina, muythaibxr

IAC output/s to control 3-Wire Idle Valve?

Postby phoenix3d » Wed Jul 12, 2017 2:24 am

Would it be Possible to run 3-wire Idle valve on one of the IAC Outputs. ( I know it's not currently supported)

But would it be feasible, As the H-Bridge is by norm a sort of Push-Pull set up? (ie. IAC1A <- Power -> IAC1B)

I would love to try but unfortunately the Option for IAC1 or 2 is not available under Fidle PWM output.

Please, if I am totally farting in the wind let me know... and why... :D

Kindest Regards
Experienced MS/Extra'er
Posts: 176
Joined: Wed Mar 19, 2008 2:12 pm
Location: South Africa

Re: IAC output/s to control 3-Wire Idle Valve?

Postby jsmcortina » Wed Jul 12, 2017 2:42 am

I'm pretty sure that the current capacity of the H-bridge driver is too low for typical PWM valves.

I can supply, repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: viewtopic.php?f=104&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
Site Admin
Posts: 34054
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK

Re: IAC output/s to control 3-Wire Idle Valve?

Postby juansh2385 » Sat Jul 15, 2017 5:49 am

James If we drive 2 tip120 from one iac output and its complementary pin it should work.
Master MS/Extra'er
Posts: 583
Joined: Fri Feb 25, 2011 4:28 pm

Re: IAC output/s to control 3-Wire Idle Valve?

Postby Vicoor » Thu Nov 16, 2017 1:29 pm

If you search you can find schematics for a circuit to drive a "traditional" 3 wire PWM IACV.

However make sure that's the kind of valve you have. There are many 2000 and newer cars that have a 3 wire connector but it is power ground and a 5V digital PWM that does the controlling.

I posted about this before

Don't Talk About it,,,Just Do It!
1993 Toyota P/U 22RE V3.0 MS2/Extra 3.4.2 Full sequential Injection & Spark
Experienced MS/Extra'er
Posts: 294
Joined: Thu Feb 12, 2009 6:58 pm
Location: Manassas, Virginia

Return to MS2/Extra Development

Who is online

Users browsing this forum: No registered users and 1 guest