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IAC Valve: Does it operate only at Fully-Open & Fully-Closed modes, or are there different positions ? 700 1985

posted by  ndesouza on  Mon Sep 20 15:23 CST 2004
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last visit: Sun Mar 18 15:14 CST 2012
[RELATED]

Thanks for the quick reply Bruce.

Decided to go to the car and trace all the important wires to the computer - should have waited for your email :) Anyway, traced the following.

Pin 3 - Orange - TPS Idle-switch terminal 1
Pin 25 - Brown - TPS Idle-switch terminal 2
Pin 10 - Grey/Red - IAC Terminal for closing IAC*
Pin 23 - Yellow/Red - IAC Terminal for opening IAC*
Pin 12 - White/Red - Test Point for setting Base-Idle
Pin 22 - White/Green - Test Point for setting CO
Pins 11 & 19 are shorted with a wire-jumper (anyone knows what this is about?)

I've now verified that the TPS-closed signal makes it all the way to the computer (there is 0 ohms resistance between pins 3 & 35 when throttle is at rest, and I lose continuity as soon as the accelerator is pressed).

Verified that IAC is in the circuit - 46 ohms resistance between pins 10 & 23

Verified that both test-points are connected to the computer without any breaks.

The only thing I still need to check is that the center-terminal on the IAC is receiving +12v. This wire does not originate at the computer but is probably connected to the ignition-switch.

I plan on opening up the computer next to see if I can spot any obvious signs of trouble there.

Thanks again,

Noel






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