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Registered:
March 2003
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MicroTech & Idle Speed Controller Valve on 1JZ
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Tue, 26 August 2003 13:42
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"The idle speed controller (ISC-valve) is located on the intake manifold. This is a little stepper motor controlled by the computer. Normally it allows measured air to bypass the throttle valve, in order to idle the engine. As the VPC replaces the stock air flow measuring mechanism, we installed a tiny K&N air filter on the ISC." From <http://supras.nl/>
Why can't my MicroTech LTX12 be wired up to control this valve on a 1JZ? It can control an R33 valve i think.
Or, is there anyway to make an incabin switch to make it idle when its cold, then turn it off when its warm?
Any other ideas?
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Tue, 26 August 2003 16:13
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It's possible & even easy to create a switchable device that could be manually controlled or hooked up to operate automatically, but it will either be on or off, open or closed, whereas stepper motors, & in my case the 4AGE has a thermal wax pellet controlled valve arrangement that has coolant circulating and the warmer it gets the closer to fully open the valve is, these provide a gradual or stepped movement from open to closed. Which requires a variable input, either directly from coolant temp like the wax pellet or electonically through a water temp sensor (and whatever else they want to hook up to it, A/C, power steering etc) & then out of a computer as a varying voltage to control a stepper motor, which the microtech is unable to do.
I'd be interested to hear the results of a simple switched valve, as I wanna get rid of my wax pellet valve but I also have a microtech, so I'm in the same boat as you.
Even then, the microtech only has 1 auxiliary output, so hopefully this is the only thing you want to use it for, & even then you'd have to use the AuxFAN function as it's the one which uses a preset water temp to control the output, and then it only switches power on at the prest value, & then off 5 degrees cooler, so you'd need a valve that's open & then closes with power applied or something like that. I'm sure microtech could reprogram it to turn off at a preset temp, but it will never control a stepper motor.
I've been meaning to try out a switched idle valve, but just havn't got round to doing it yet. 
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Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Tue, 26 August 2003 17:21
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Thanks for your reply.
This brings up another concern, how am I going to get my Airconditioner to work with my microtech. I guess I'm going to have to somehow intergrate my stock ECU in somehow, and even then the MicroTech won't raise the RPM when the compressor is switched on.
So without any input im guessing the stock stepper motor is left in a position were the car will still run? is it's off setting it's warmed up setting?
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Location:
Gold Coast
Registered:
July 2003
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Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 00:32
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juicen,
I've had to drive like that for a while now. Maybe if you get the idle and cold start maps redone perhaps? This might solve it, initially for the first 5-10 mins it will idle badly or stall, but after that it will run fine until it warms up.
With the RPM, they managed to get my digital dash working with it and I have the older model Soarer.
At the moment, as it is summer, getting the airconditioner to work with the MicroTech is my main priority, but no one seems to know or can help me with it. As far as I know, it just needs to engage the compressor and raise the rpm's slightly. But I was wondering, could it be possible to have a switch, like i thought it would have anyway, once you press the A/C button on your dash, to activate the compressor, and not worry about raising the RPM?
I'm sure there are a quite a few people here with MicroTech's and aircon!
Danish.
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Location:
Syndey
Registered:
December 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 00:36
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Does the 1JZ have a 3 wire stepper motor??
if so i may be able to get this setup for you, i have the 3 wire on my misses car running off the LT8,
are you running 6 coils or 3 coils with waste spark?
if we can get this done, you can use the aux input to idle up when the aircon is switched on,
at the moment i havent got this setup on the misses car and it idles fine with the aircon on,
also does the air con compressor actually click in?? if not i know how to fix this
Dale
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Location:
Gold Coast
Registered:
July 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 00:54
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| 10sec_rx7 wrote on Wed, 12 November 2003 10:36 |
...also does the air con compressor actually click in??...
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it doesn't engage - or even try - just the Air-con light comes on, no action.
As for the other questions ... i'm mechanically inept  so I can't help. sorry
cheers,
-jason-
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Location:
Syndey
Registered:
December 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 00:58
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OK it dosent engage because who ever fitted your computer messed it up, you need to have the signal from the CAS going to the factory ecu so it can lock in the air con, you will need to do some wiring to get this working correctly,
ill check on the idle valve for you guys and let you know
Dale
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Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 03:57
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So would the CAS run through my stock 1G-GTEU ECU, then in parralell to my LTX-12? Therefore giving me aircon, and not interfering with the LTX-12 or 1JZ?
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Location:
Syndey
Registered:
December 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 04:13
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Thats correct, you have to leave the wires going from the CAS to the factory ecu and then tap into them with the microtech wires, this is how i do the 200sx, starlet etc etc, all the air con works.
Dale
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Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 04:30
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So the standard ECU will work even though only 1 wire is going into it? ie. CAS. and Then it can switch on the compressor?
I'm not to sure how I go about this. I guess the other problem is finding out which wires have to go into the stock ECU from the aircon.
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Location:
Syndey
Registered:
December 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 04:32
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is your factory ecu still in the car?? it should be there somewhere with some wires still hooked up to it to run things like the dash lights and stuff,
Dale
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Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 04:45
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No the ECU is out, I still kept it though. The MicroTech is running everything, digital dash, etc. However the only things that don't work are the warning lights and the warning tone when you leave your lights on.
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Location:
Syndey
Registered:
December 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 04:49
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ok it will be a matter of finding the wires that came out of the factory ecu for the air con and hook them up to ign or earth to make the compressor click in.,
Dale
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Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 04:58
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Ok, i'll be trying that in a few weeks. Thanks heaps.
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Location:
Syndey
Registered:
December 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Wed, 12 November 2003 05:03
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no probs,
if you can supply me with some wiring digrams i will have a look and tell you which wires to play with
Dale
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Registered:
March 2003
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Thu, 13 November 2003 12:47
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I'm pretty sure mtech has an air intake temp sensor
boost is already sensed through your MAP sensor
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Location:
sydney
Registered:
March 2003
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Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Thu, 13 November 2003 13:03
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"another way for cold start is to fit a nissan auxilary air valve whick works of power to fuel pump"
How does that work for cold start?
Yeah MicroTech can do all that. I didn't realise it could measure boost from the MAP sensor, that's a bit silly of me!
Sideshow: I guess i'll be getting Tim to wire up my aircon then!
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Location:
sydney
Registered:
March 2003
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Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Thu, 13 November 2003 13:31
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But doesn't my fuel pump run all the time? Bosch 979.
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Location:
sydney
Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Thu, 13 November 2003 21:43
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if yr fuel pump is hooked up correctly then it should only run when engine is running
it doesnt realy matter u can connect these valves of ignition
as long as u dont leave ignition on alot before u start it
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Location:
Syndey
Registered:
December 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Thu, 13 November 2003 21:47
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i have always used the factory ecu to control the air con, it just saves a heap of messing around,
what i have found with toyotas there is a relay in the loom that triggers when the engine is running, you just need to find this and trigger it with the ign on and the aircon should work.
Dale
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Location:
sydney
Registered:
March 2003
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Thu, 13 November 2003 22:00
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whether u use the factory ecu or the aftyermarket ecu
the a/c is the same
when u change the engine
u still have to fuk around and connect the wires to the a/c
most of the time the newer engine has more advanced sensors
like slip sensors and stuff
all u need to find is the wire that triggers the magnetic clutch
then find which wire goes to the magnetic clutch on the a/c
u might have to bypass the sensors on the a/c and join these together
then its piss easy to make yr own idle up solenoid to get triggered of the power that turns on the a/c
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Location:
Montrose, VIC
Registered:
May 2002
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Re: MicroTech & Idle Speed Controller Valve on 1JZ
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Thu, 13 November 2003 23:00
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microtech strikes again 
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). Along with air-con failure, I also have no in-dash RPM - which i've been told is affected by the same situation.