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Stepper motor / Idle control inputs to ecu - ?? what inputs are used??


Well-known member
Feb 6, 2003
Melbourne, Australia
Hi guys!

I thought I posted this up yesterday but it must have not sent as I did it on my phone.
Anyway, My question is to those who understand exactly how the stock ecu works.

The question is:
What inputs are required for the stock ecu to control idle via the stepper motor?

I am running a Motec M4 which are quite limited to the amounts of inputs and outputs. I need to setup idle control as the AMG doesn't like to idle below 1400 rpm and also doesn't like to idle with full lock p/s and air con on. So I really need idle control on this car to make it nice to drive.

My guess is that the STOCK ECU needs
1. rpm
2. p/s switch (bump up idle)
3. air con switch (bump up idle and turn on a/c compressor)

apart from the the obvious dc supply etc.

I will only be wiring in the stock ECU to simply control idle + aircon.

Any info greatly appreciated!
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