ok so i have a 1.8t awp engine code
im using a 24v75mm vr6 cable throttle body
im trying to figure out how to wire the idle motor on this TB
some info from the bentley...
pin8/1 br/li~ grd
pin8/2 ro/li~ im thinking thats my power
and then pin 8/3 and 8/7 are my idle switch
now my problem is in the bently it looks like theres power and grnd to a motor in the throttle body along with an idle tps and an idle switch
i wired my tps no problem but the motor to control my throttle im pretty confused cause it doesnt look like the iac types shown below from the vems website
got this info here....http://www.vems.hu/wiki/index.php?pa...assiveThrottle
im trying to figure out how to wire this up and control it with my VEMS
heres the info on the iac off the vems website....hopefully someone can help and this will prolly help anyone else in the future trying to do this
Idle Air Controller (IAC)
An Idle Air Controller (IAC) is used on most fuel injected engines to provide a method of controling the engine's idle speed. When the car is warming up or an additional load is put on the idling engine such as the additional current of an electical fan or air conditioning compressor it is necessary to raise the engine's idle speed to stop it from stalling.
There are a number of different idle speed controllers:
Wax is the simplest and most common on Japanese cars and are not controllable by the ECU in that they use a wax filled piston which opens the throttle slightly when cold and closes it when the heat causes the wax to expand.
Solanoid IACs use a single coil to open or close a valve in the inlet (in some cases to actually move the throttle plate). The simplest can be either opened or closed and will cause small increase in idle speed. More sophisticated types can be pulsed to provide a variable increase in RPM.
Multicoil and Stepper motor IACs allow a more complex level of control, in its simplest form it will have two coils to open and close the idle valve.
Choosing the correct IAC connection
Single coil types are relatively simple to connect, the only thing you need to know is the resistance of the IAC's coil by measuring it with a DVM. Once you have the resistance value use Ohms law to calculate it's current load. I=V/R.
The IAC coil for a Nissan 200SX is measured at ~11 ohms a voltage of 13.8V would mean a current of ~1.26A (13.8/11) which means that a spare high current port (EC36-pins6, 9, 17 or 18) would need to be used.
The Toyota "Idle Up Valve" found on the early 4A engines has a solanoid coil with a resistance of ~44ohms, which gives a current of 313mA(13.8/44). As this is less than the maximum 350mA value for EC36-pin3 (Fast Idle) it would be possible to connect it, but this is only advisable if you are using all the other high current pins. In all other cases its advisable to use one of the spare pins.
Dual Coil Solenoid IAC Control
Found in some BMWs (Bosch) along with Toyota & Subaru, These have three pins, one of which is common, one is a solenoid that opens the idle valve, the other is a solenoid that closes the valve. If neither coil is activated the valve remains in a 50% open poisition (preset-spring type), or moves freely between opened/close position (no spring type).
EC36-pin6 to IAC close pin
EC36-pin17 to IAC open pin
Set IAC actuator speed/pwm freq
stepper speeds : 0 - 976 steps/s, 1 - 488, 2 - 326, 3 - 244, 4 - 195, 5 - 163, 6 - 139, 7 - 122, 8 - 108, 9 - 98, 10 - 89, 11 - 81, 12 - 75, 13 - 70, 14 - 65, 15 - 61.
pwm freq: 0 - 244 Hz, 1 - 195, 2 - 163, 3 - 139, 4 - 122, 5 - 108, 6 - 98, 7 - 89, 8 - 81, 9 - 75, 10 - 70, 11 - 65, 12 - 61, 13 - 57, 14 - 54, 15 - 51.
Stepper Motor IAC
One of the most common types of IACV after the single coil solenoid is the Stepper motor type. The 4 pins of the 2 coils are connect to the 18pin Econoseal plug.
The coils are preferrably connected between A-B and C-D stepper outputs:
Using the dialog Extras->Idle Settings General
Set Control Type to PWM/Stepper
Initially IAC actuator speed/PWM freq should be set to 10, this number will need to be reduced to speed up the stepper, this needs to be done once the idle control is working.
Set Max steps to extend to a low number, as this defines the number of steps that the controller will allow the stepper to make, too many steps will cause the controller to open too far and potentially jump the IACV. Initially start at 50 steps and increase the number once you have stable idle.
Under Iac Hardware setup
Set Type to Stepper
The stepper pattern is defined as a binary pattern where:
Coil A=00 Coil B=01 Coil C=10 Coil D=11
So to define your pattern use the Windows Calculator in binary mode and convert to decimal mode, then put the result in the Iac step sequence box.
For example the typical patterns are
D->B->C->A which is 11->01->10->00 11011000 or 216 in decimal.
D->A->C->B which is 11->00->10->01 11001001 converted to decimal is