anyone used a Subaru PWM IACV?

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Mwood95
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anyone used a Subaru PWM IACV?

Post by Mwood95 »

Hey I have an EG33 H6 from a subaru SVX.
I can't find any up-to-date info on wiring up an MS2 unit with a V3.57 board to one of these 3-wire PWM IACVs.
I'd like to use the stock IACV as it bolts onto the manifold, and I already have one.

stock valve:

http://mlm-s1-p.mlstatic.com/valvula-ia ... 2016-F.jpg

http://i.ebayimg.com/images/g/ENoAAOSwy ... s-l300.jpg

has anyone done it? how did you go about it?
I believe certain Imprezas and legacys had these in addition to the 3.3

Thanks!

Mitch
grom_e30
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Re: anyone used a Subaru PWM IACV?

Post by grom_e30 »

there is a circuit here: http://www.msextra.com/forums/viewtopic ... 01&t=41760 you could built to control both sides of the valve using just one output from the ecu. i would assume that should work with your valve.

i have used a bmw / bosch 3 wire pwm valve using the resistor method in the past as well.
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
dontz125
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Re: anyone used a Subaru PWM IACV?

Post by dontz125 »

The usual technique for a 3-wire is to ground one wire through a substantial resistor, and PWM the other. There are DIY circuits you can build for true 3-wire control; I have my own design that I am in the process of manufacturing. The size of a TO220 transistor, my little card fits in the Q16 spot (assuming you don't have anything there already), and drives the valve using the IDLE (open) and IGN (close) pins from the DB37.
3-wire IAC Q16.jpg
Installation is simple:
  • unplug and remove the MS V3.57 main board from the enclosure
    solder a jumper wire to the card at 'S12'; the 'IDLE' pad is not used with the V3.57 main board
    loosely install the card in the Q16 spot using the included TO220 installation kit
    loosely install the included 3-way header pins into the Q16 card and the Q16 pads on the V3.57 main board
    snug the mounting bolt; this will keep the card and header pins in position for the next step
    solder the header pins to the card and to the main board
    on the main board, solder a jumper from Igbt_In to the right side of R19
    solder the 'S12' jumper to the S12 pad on the main board
    put the MS back together
Price is US$20 + 10 for the postman. I should have these in hand this week.
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dontz125
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Re: anyone used a Subaru PWM IACV?

Post by dontz125 »

Wiring up the Q16 card:
Q16 on V3.57.jpg
Q16 on V3.0.jpg
QuadraMAP Sensor Module -- PWM-to-Stepper Controller -- Dual Coil Driver
Coming soon: OctoMAP Sensor Module
TTR Ignition Systems
tpsretard2
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Re: anyone used a Subaru PWM IACV?

Post by tpsretard2 »

center pin positive. 2 end pins are negative,

they do not work well with one leg being grounded like how the bosh units work. i used the zeal board and it worked fine.

https://www.diyautotune.com/support/tec ... -wire-iac/
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