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Old 10-16-2011, 11:34 AM   #1
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Default MS3X no IAC - problem solved!

Can't get the IAC valve working on my '99.
I'm using the idle out (db37 pin 9) on the MS3X.
Do I need to activate that output somewhere in TS?
I built the 'normal' fidle circuit on the V3, thus Q20, Q4, R39 and D8.
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Old 10-16-2011, 11:44 AM   #2
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idle shoudl be set to "idle" not "fidle" iirc.
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Old 10-16-2011, 02:56 PM   #3
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that's how I have it.
Forgot to add msq.
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Old 10-16-2011, 03:00 PM   #4
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Why did you build the 'normal' idle circuit if you're using the one on the MS3X?
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Old 10-16-2011, 03:15 PM   #5
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Good question, that I asked myself as well. I did it because of this sentence in step 26 of the MS3 build manual:
Quote:
ii) PWM Idle Valve:
Note! This is not required with the MS3X card - use one of the mid-current outputs on the MS3X card for you idle valve and fit the standard components Q4, Q20, R39, D8.
So I fitted the standard components and used the MS3X idle output.
In the idle control menu, I selected Valve mode Normal, output port 'idle', 390Hz.
Do I need to activate PP2-Idle under Output port settings as well?
Other outputs work fine (tacho, fan, vics etc).
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Old 10-16-2011, 03:29 PM   #6
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Dammit someone PLEASE unblock Belgium. Surfing the board is one thing, but trying to get something posted is another.

/rant

I don't need to add these jumpers, do I?
a) JS0 to IAC1A
b) JS1 to IAC1B
c) JS2 to IAC2A
d) JS3 to IAC2B
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Old 10-16-2011, 04:37 PM   #7
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No that's for a stepper motor.
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Old 10-16-2011, 05:51 PM   #8
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if you're using the expander idle pin, just run that to your idle pin on the harness connector.

you have 12V power to the idle valve in addition to the above?

i see your msq is set to pwm warmup and 390Hz on "idle" output. so that's ok.

did you power cycle after setting these?
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Old 10-17-2011, 07:25 AM   #9
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Made a stupid mistake. The idle output was working all along, except that it's working in a completely different range. I did do the idle valve test, but never tried anything over 50% not to overrev the (cold) engine. I let it warm up today and raised duty some more and sure enough, the valve came to life .
On my MS2, for 800rpm I needed about 20% duty. Now I need 60% duty. Under that, no reaction. Changing the valve freq doesn't seem to make a difference (nor noise).

Closed loop doesn't yet want to cooperate, no matter what I do, the idle just hangs there, with the closed loop indicator on. Need to play with it some more.

Seems there's a couple of new interesting things to play with, like VSS .
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