Is my ecu bad?

[Galant]

I have a 2000 mitsubishi galant 3.0L(v6)

If my IAC wiring harness which has 6 pins is giving 12v on 2 of the 6 pins then is that a sign that my ecm/pcm is good?

I ask because i have 3 old iac and when i removed them from the throttle body and turn the key on and off 2 barely move and 1 strugles to move and sorta glitches(sometimes other times it doesnt move just vibrates). So im suspecting the ecm/pcm anyone help please

Topic

[college man]

see if this helps with diagnostics.

http://mitsubishi-motors.kiev.ua/Manuals/Galant_EA/WorkShop/13.pdf

[Timothy Salomon]

page 13A-64 shows the Idle speed Control Valve uses the additional connectors to increase idle speed when the air conditioner is running. As always, the last choice is to replace the ecu, and have a dealer reprogram it. so I would try to jump 12v power and ground to the valve while disconnected to prove it is good, then check the harness for continuity. From your other post, I think you are getting all the right signals from the ecu. Full time 12v power on pins 2&5 comes directly from a fuel injector relay anytime the key is on. Grounds on 1,3,4,6 depending on whether the ac is on or off come from the ecu. Page 13A-169 show a modulating ground controls iac position. easiest seen on a scope, but shows as an average, probably around 5-7 volts on a multimeter.

[Author]

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