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Joined: Wed Oct 26, 2011 9:17 pm
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Location: Aranda, ACT.
Vehicle: 4 door Vitara G16B Auto

Post Posted: Wed Mar 06, 2013 10:25 am 
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Can't remember what Suzy calls its IAC/ISC, etc. Anyway, when Suzuki updated from the V6 2.0L (H20A) to the 2.5L (H25A), one of the changes they made was in the ISC. The H20A uses a two-wire valve like this but the H25A uses a six-wire stepper motor style valve.

Ok, that's the background. I updated the motor from H20A to H25A, but not the computer - this means I kept the H20A injectors, ISC valve, and the two-wire COP modules (well actually I used a BA Ford COP modules which are electrically/electronically interchangeable) and of course the ECU, but otherwise it's an H25A motor with H20A ECU....

But, my two-wire ISC is buggered (and it has a very interesting effect on my snorkel which produces this farting sort of noise, but that's another story).

Solution:

1. get a new ISC.
2. fix the old,
3. get a converter that somehow changes the two-wire PWM signal, from the H20A ECU, into a series of step pulses to drive the six-wire ISC.

So, being a tech-type, 3 sounds interesting, and something I could actually do myself (perhaps I'm fooling myself how long it would actually take to do bcause we're probably talking about a microcontroller, multiple driver FETs, etc!), but realistically fixing the old is probably the way to go, so:

a. Anyone fixed these?
b. would it just be easier to get a new or used one?


Last edited by techedge on Wed Mar 06, 2013 7:15 pm, edited 1 time in total.
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Location: Dandenong .Vic
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Post Posted: Wed Mar 06, 2013 3:04 pm 
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Way easier to just get a replacement 2 wire one.

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