AUX idle control problems

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Nov 22, 2011 | 07:45 PM

1982_f150

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From: Nanaimo B.C. Canada

AUX idle control problems

Hey guys, just got a AUX idle control for my truck, installed it and at around 50 kph it engages my exhaust brake!?! Wtf

Nov 22, 2011 | 07:54 PM

Shake-N-Bake

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From: Mesa AZ

Need more info...
Did you get the Ford AIC module and plugged it into the OEM connector behind the dash access panel? The PCM ignores that module unless the parking brake is set so it shouldn't be the cause of your issue

Nov 22, 2011 | 08:06 PM

1982_f150

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It's the factory ford one with the pto control..

Nov 22, 2011 | 08:10 PM

1982_f150

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Plugs in behind the dash

Nov 22, 2011 | 10:08 PM

Shake-N-Bake

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From: Mesa AZ

What brand exhaust brake do you have? How is it wired?
The factory AIC connector has only four wires. 12v power, ground and then the two Standard Corporate Protocol bus wires which is for module to module communication. There is no way for the AIC to affect an aftermarket exhaust brake unless it has a module that communicates with the PCM.

This one is a puzzle for sure...

Do you have the AIC module with the PTO button? If so, what did you do with all the loose wires? (the ones that are separate fron the 4 wire connector...) each of those must be insulated and secured so they aren't grounded anywhere...

Nov 22, 2011 | 10:20 PM

1982_f150

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It is the pto one. The pto wires are not connected to anything and are capped. it's a BD brake, the AUX control works good

Nov 22, 2011 | 10:27 PM

Shake-N-Bake

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From: Mesa AZ

My guess is the BD brake ground wire is connected to circuit 322 (light blue with yellow stripe) or perhaps it is sharing the power circuit with the AIC.

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Nov 23, 2011 | 10:34 PM

1982_f150

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From: Nanaimo B.C. Canada

Unplugged the controller, brake still dysfunctional.. Wtf haha. it never did this before till I plugged that thing in?!

Nov 24, 2011 | 02:06 AM

#10

twags6

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From: Slatington, PA

Well at least you know it wasn't the controller doing it! Isn't it amazing how installing or fixing something screws up other stuff?? Double check all the wiring for the exhaust brake. Maybe something got knocked loose or something is touching that shouldn't be.

Nov 24, 2011 | 10:16 AM

#11

1982_f150

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Quote:

Originally Posted by Shake-N-Bake

My guess is the BD brake ground wire is connected to circuit 322 (light blue with yellow stripe) or perhaps it is sharing the power circuit with the AIC.

There is a light blue with yellow stripe On the AIC plug under the dash, it's the only one not connected to anything, has a peice of tape wrapped around the end

Nov 24, 2011 | 11:42 AM

#12

Shake-N-Bake

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From: Mesa AZ

Quote:

Originally Posted by 1982_f150

There is a light blue with yellow stripe On the AIC plug under the dash, it's the only one not connected to anything, has a peice of tape wrapped around the end

Ok. Good. That is the PTO enable circuit that runs to the PCM. In theory, it might backfeed some power when using the Ford AIC but I would hope the PCM architecture would have accounted for that.

Another thought that I had was that the ground for the exhaust brake and the ground for the AIC connector might have been shared but you already figured out that the AIC module is not causing your issue.

Since we are talking about the blue w yellow wire....
If you wire a switch that provides 12v to that wire then you will have fast idle if other conditions allow. According to the manual, the parking brake must be set, foot off the brake and foot off the throttle (however I have seen at least one vehicle where the parking brake didn't need to be set so perhaps there is a work around for the fadt idle conditions...

Jan 23, 2012 | 04:33 PM

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Nonturbo

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I know this is kinda old but could I use one of the ambulance AIC's on my 97 7.3 with a superchips programer?

I just really dont want to screw up my computer...

Jan 23, 2012 | 04:44 PM

#14

Shake-N-Bake

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From: Mesa AZ

Quote:

Originally Posted by Nonturbo

I know this is kinda old but could I use one of the ambulance AIC's on my 97 7.3 with a superchips programer?

I just really dont want to screw up my computer...

Should work fine. I am not sure where your concern comes from but it would be very hard for the AIC module to harm the PCM. The AIC simply joins the module network and communicates via Standard Corporate Protocol. If the AIC is faulty, the PCM will ignore it and operate the vehicle as if it weren't there. At least this is how it works on the Super Duty trucks....I presume the OBS trucks are similar...