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St205 with an st215 caldina idle control valve issue


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Hi guys, 

I'm have real issues getting my Idle below 1300 on my celica gt4 st205 with caldina intake manifold and throttle body. 

It's a 3 pin iscv, I have it wired correctly

Pin 1 (top) = signal

Pin 2 (middle) = 12v

Pin 3 (bottom) = ground

When plugged in and tested it buzzes and even effects the idle but even with the duty set as low as 10 it will not drop the idle below 1300 when up to temp.

 

If I unplug it, the idle is 1300 when up to temp. I have had it on the bench and it looks like the valve naturally sits half open with no power. If the 12v and ground is connected it still sits half open, if I tap the signal to ground it closes for a split second then opens again even if the signal stays on ground so it needs to be repeatedly tapped for it to close again. 

Am I right in thinking if the duty cycle was turned right up to 80%+ would this reduce the idle or am I barking up the wrong tree? 

 

I really need to figure this out, it's not just my car either I know of 2 other guys in the same boat as me

 

20190601_192743.jpg

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I dont have any specific experience with that valve, but here's what I suggest:

As a test set the aux it is connected to to "GP PWM" like my example below.  With the valve unbolted from the engine but still plugged in you can then highlight the whole PWM table and command different duty cycles and observe what DC's give you fully open and fully closed.  Once you have that info you can use those values as your minimum and maximum clamps in the idle control settings.  

Some solenoid valves fully closed is about 20% DC.

 

2e0vkmo.png

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so i've been out done exactly as you put in your example and 100%  the valve is fully open and no matter how low you put the duty cycle it does not close. There is a slight amount of adjustment by undoing 2 bolts and twisting it but it still doesn't fully close. I'm completely baffled with it as it would close for a split second when i tested it on the bench when i tapped the signal to negative.

 

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On 6/1/2019 at 9:28 PM, Adzn3k said:

Hi guys, 

I'm have real issues getting my Idle below 1300 on my celica gt4 st205 with caldina intake manifold and throttle body. 

It's a 3 pin iscv, I have it wired correctly

Pin 1 (top) = signal

Pin 2 (middle) = 12v

Pin 3 (bottom) = ground

When plugged in and tested it buzzes and even effects the idle but even with the duty set as low as 10 it will not drop the idle below 1300 when up to temp.

 

If I unplug it, the idle is 1300 when up to temp. I have had it on the bench and it looks like the valve naturally sits half open with no power. If the 12v and ground is connected it still sits half open, if I tap the signal to ground it closes for a split second then opens again even if the signal stays on ground so it needs to be repeatedly tapped for it to close again. 

Am I right in thinking if the duty cycle was turned right up to 80%+ would this reduce the idle or am I barking up the wrong tree? 

 

I really need to figure this out, it's not just my car either I know of 2 other guys in the same boat as me

 

20190601_192743.jpg

If I remember correctly with my St205 valve the pins were, open, 12v, and close. I don't know if st215 is different but I believe the pins were the same. 

The valve controls by ground the open and close pins.

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Yeah, I agree with Toliski here, I suspect this is a two coil open/close signal type valve, not a single solenoid like you think.   Can you get a multimeter and measure the resistance between the three pins.

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I've got tons of experience with these valves, same as is used on the 1zz, 2zz and v7-9 WRX's.  Take the screws out so the back manget/connector section can be removed and check that the mechanism spins freely.  It's really common for them to gum up or even become rusted internally and then it doesn't matter what you do trying to control it you will fail.

I run then at 250hz and usually need something like a 20% duty control range.  Eg, low temps around 60% duty and operating temp around 40%

 

Edit:  It may be a two coil type as posted previously, simple enough to check but still worth checking that the control mech can spin freely

Edit again:  Looking at the ST215 3sgte EWD, the valve only has 1 control wire like the 2zz, 1zz etc.

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So I bought another icv from a different car that had no idle issues and it's still the same as the one on the car, it naturally sits half open and closes for a split second when the signal is put to ground. My cars not here to test it but I'm expecting the same outcome which will be high idle

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On 6/3/2019 at 9:53 AM, Adamw said:

Yeah, I agree with Toliski here, I suspect this is a two coil open/close signal type valve, not a single solenoid like you think.   Can you get a multimeter and measure the resistance between the three pins.

Did you measure the resistance yet?

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Actually, looking at your first picture and your described pinout I think you have it wrong.  Pin 3 would be the top pin wouldnt it?  You say it is the bottom.

Here's connector pic from ST215 manual:

4bLCgYt.png

 

Same orientation as this:

eu3EYQY.png

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