How to re program the ICS on a 1uz-fe using and aftermarket computer

**toranarod** · 06-03-2010, 11:12 AM

I am looking at controlling the idle control solenoid
Is there any body out there who has already done that

Smoke gets in your eyes

**MWP** · 06-03-2010, 11:37 AM

Depends on what aftermarket ECU is being used.
Itll need to have support for a stepper-motor ICS.

If your using an ECU that doesnt support a stepper-motor, and only PWM, youll need to use a ICS from a different engine.

**toranarod** · 06-03-2010, 02:43 PM

You are a very knowledgeable guy. I have just pulled the unit of the motor
you are right, it is a worm drive stepper motor. Toyota is very clever.

I have a question for you. Maybe you know. I am running the factory ECU and the Idle speed is always different sometimes it stops and sometime it runs very fast, and sometimes it runs perfectly.
I would like to understand this before i ditch the Toyota ECU.
the ICS unit seem in good condition because it works hard wired when you manual switch the unit.

**thechuckster** · 06-03-2010, 10:13 PM

Originally Posted by toranarod

I have a question for you. Maybe you know. I am running the factory ECU and the Idle speed is always different sometimes it stops and sometime it runs very fast, and sometimes it runs perfectly.

this is closed-loop idle control in action (ECU has a target map for idle speeds). It'll refer to a map/table for idle speed and also apply adjustments that will raise/lower idle speed based on coolant temp, inlet air temp, gear-position, climate-control, electrical load on alternator, oxygen sensor, etc.

closed-loop idle control is nothing unique to high-end ECUs but stepper-motor control makes it/wiring more complex.

**JustCallMeOrlando** · 06-03-2010, 11:16 PM

The base model Adaptronic e420c is quite capable of controlling the 1UZ stepper motor. I was getting it to do that exact thing on my old 1G (same sort of ISCV).

As thechuckster said, it will move around based on its table. Additionally, if your speed sensor isn't connected to the ECU, it can do some screwy stuff.

**ice** · 23-03-2010, 07:44 PM

Originally Posted by JustCallMeOrlando

The base model Adaptronic e420c is quite capable of controlling the 1UZ stepper motor. I was getting it to do that exact thing on my old 1G (same sort of ISCV).

As thechuckster said, it will move around based on its table. Additionally, if your speed sensor isn't connected to the ECU, it can do some screwy stuff.

Is this adaptronic specific ? mines driving the stepper motor all over the place with the motor not running and the ignition on

**JustCallMeOrlando** · 24-03-2010, 01:11 AM

Factory ECU? the factory ECU will open the valve all the way when the car is turned off to help with starting. The Adaptronic is like any aftermarket ECU, it only does what you program it to

**ice** · 24-03-2010, 09:11 AM

no standalone. i didnt wire it up so im now chasing why its hard to start and fouling the plugs

**JustCallMeOrlando** · 24-03-2010, 12:14 PM

Hmm, may be wired up incorrectly. It will start with it fully closed, but it will start better and easier with it open. The air leak just makes it that much easier for it to kick.

**ice** · 24-03-2010, 12:16 PM

yeah have been blocking it off to get it started when cold, when the motor is turned off and the ignition is on, it is driving it back and forwards you can hear it clicking

**turbo ke20** · 26-03-2010, 10:28 PM

haltech ecu's have 4 wires dedicated to stepper motor idle control.
so that your best option in my opinion.

**jzk25** · 30-03-2010, 09:55 PM

Any decent ecu can run a powered stepper motor. Adaptronics just do it for half the price.

**stradlater** · 27-05-2010, 10:15 AM

Sorry to dig this up - but - I have a Haltech Sprint 500, and I'm not so sure it can run the Stepper motor ISCV on a 1uz.

Is this right?

Turbo-KE20 - you said that Haltechs have the wires, but all I can see is the DPO's, which will handle PWM, but apparently that doesn't control a stepper motor???

**toranarod** · 27-05-2010, 11:25 AM

Originally Posted by stradlater

Sorry to dig this up - but - I have a Haltech Sprint 500, and I'm not so sure it can run the Stepper motor ISCV on a 1uz.

Is this right?

Turbo-KE20 - you said that Haltechs have the wires, but all I can see is the DPO's, which will handle PWM, but apparently that doesn't control a stepper motor???

Hello From the time I first created this post I have done a lot of researcher and work on the
1UZ-FE, The ICS is a very important part of the 1uz and setting it up correctly is even more important. I final got my motor working properly,
The Haltech Sprint 500 does not support Stepper motor control but it could control a stepper motor control circuit, it cannot directly out put a step sequence to a stepper motor but through it AUX outputs it can control a stepper driver controller
or get a new ECU?
Look at an IC called UNC5804B put this in a search in Google

cheers Rod

http://www.thehydrogenshop.com/1uzfe/prof2.gif

**toranarod** · 27-05-2010, 11:28 AM

Hello From the time I first created this post I have done a lot of researcher and work on the
1UZ-FE, The ICS is a very important part of the 1uz and setting it up correctly is even more important. I final got my motor working properly,
The Haltech Sprint 500 does not support Stepper motor control but it could control a stepper motor control circuit, it cannot directly out put a step sequence to a stepper motor but through it AUX outputs it can control a stepper driver controller
or get a new ECU?
Look at an IC called UNC5804B put this in a search in Google

cheers Rod