ISCV warm up question

[xr3iturbo]

ello again looking for some info
cant seem to get my iscv working with ms ???????(it dose have uprated driver etc)



Or can i work around this any other way???????



thanks tommy

[Bernard Fife]

Tommy,

It's not possible for us to give advice on what might be wrong, as there's not enough info in your post.

Do you have a stim? Does the FIdle light brighten and dim as you'd expect when changing the CLT temperature (coolant pot), etc.?

Lance.

[xr3iturbo]

Sorry lance but i did not build it so i dont know what to look for,

ok the warm up led dose come on but stays constant no differ,

And afraid i dont have a stim

the unit was built by phillip ringwood and has helped all the way and with the quality of his work i think its something on my behalf..

thanks for the fast reply but just need to get this sorted>

[mops]

you should set idle control as pwm valve.

on stim, the idle led should turn on and off very quickly (100Hz), according to pwm value set.

[xr3iturbo]

idle is set to pwm and i dont have a stim,but i was told the middle led is to indicate warm up (and it dose come on and turn off at certian temp-led that is) i mesured across the 2 pins and when i hold the revs up from a cold start i was getting around 10v from -fidle wire+12v,then tryd putting 12v to valve and shorted other pin to earth revs shot up but wire got very hot???.so i think the valve is working
any other options to try?????????????????????????


thanks alot guys

[mops]

ok, ok... be very carefull here.

if the wire got hot it's bad, as that means heaps of current. MS unit will not handle all that current.

what i would try next is get few resistors....

measure the resistance across pins of your valve.

you want it to be about 50 ohm's... if it's not you will have put an appropriate resistor in series with that grounding wire. that will limit the current. as well set the stim for some low value of pwm, and work your way up when testing, not the other way around. generally you want to start with high resistance, and if you get no/low action then reduce the resistor value.

ideally you will have ammeter hooked in series with that ground wire aswell and watch the current. I'm not sure on the exact target value you want for that particular valve... but i'd imagine 0.2~0.3 A. my 3 wire bosh takes up to 0.4A per circuit, but I have separate circut to drive it, so MS is not providing any power (just signal). I'm not sure what max amperage ms2 unit will handle on pwm fast idle valve...
maby somebody can advise better.

[xr3iturbo]

just had a look at data cd says valve is around 6-14 ohms


dose this help seems bit low to what you were thinking

i feel a problem coming on????

[mops]

well.. maby not a problem, but a slight complication.

at 6 ohm's you have 2A flowing throught that wire, so no , ms will not handle that.

geab a 30-40 ohm resistor and hook up between ground and earth on the valve. use ms to drive the other pin. measure current on the ground wire.

see whether valve works (current might be not enough to make it work correctly). worst case scenarion, you will have to modyfi MS to to handle appropriate current, or just build an external circuit to drive that valve (thats what I did).



just had a thought. is the outside case of the valve made of metal ? measure resistance between pins and the casing, *maybe* casing is the ground.

[xr3iturbo]

right small update the resistance between the 2 pins is 9ohms

when i start the car it gives me 11+v

and the casing is not the earth no redings at all when touvh casing to any of the 2 pins

any ideas

[mops]

hook one pin to ms, and the other to ground via 30~40 ohm resistor, see what happens.