Idle Validation Switch? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 03-09-2009, 08:54 PM Thread Starter
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Idle Validation Switch?

Hey guys... Is there such thing as some sort of switch, somewhere in the wiring, that turns on or off when the truck is idling??? If yes, where can I find this switch?

Thanks guys!!!

2001 F250 (Extended Cab, Short Box)
7.3L,
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post #2 of 12 Old 03-09-2009, 08:56 PM
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There is an IVS but what are the problems you are having?

RICK


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post #3 of 12 Old 03-09-2009, 08:59 PM Thread Starter
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No problems.......

I can't afford a TW chip for another few months, or longer, and I'm really impatient. I've been playing around with the ICP mod, and love the power I'm getting from a 1.5k resistor (I have it wired on a switch). I was thinking of somehow including the idle switch so that the resistor mod only works when on the throttle (the truck doesn't like to idle with a 1.5k resistor).

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post #4 of 12 Old 03-09-2009, 09:04 PM
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Ahhh i see, ya got me on that one. Hopefully someone else will chime in.

RICK


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post #5 of 12 Old 03-09-2009, 10:11 PM Thread Starter
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I did some searching around.... And I according to what I've read, it's right on the pedal assembly (which obviously makes a lot of sense, haha). I'll look around tomorrow and see if I can find it. I'll have to play around with a multimeter to see if it turns "on" or "off" whenever the truck is idling, so I can figure out how to wire this switch into my resistor mod.

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post #6 of 12 Old 03-10-2009, 07:35 AM
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Mud Nut, just play with the pedal and you can see how the IVS operates. IIRC its a micro switch that activates once the pedal is depressed a certain amount. Should be easy sleasy to figure out.

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post #7 of 12 Old 03-10-2009, 05:46 PM Thread Starter
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Alright guys.... I found it without any problems. I even spliced into the wiring. But I have a problem.

The IVS is closed at idle, and it opens up as soon as the pedal is pressed down. Unfortunately, I need to break the circuit resistor circuit at idle, which is the opposite of what the IVS does.

Now what? Hahaha!!

2001 F250 (Extended Cab, Short Box)
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post #8 of 12 Old 03-10-2009, 09:23 PM
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use a relay with normally closed contacts, so when the switch opens, the relay will loose power, and close the contact, enabling the resistor. Check the voltage though, IIRC sensor supply voltage is 5VDC, but you should be able to find 5V reed relays.

Bill

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post #9 of 12 Old 03-10-2009, 09:39 PM Thread Starter
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Quote:
Originally Posted by alberta 7.3 View Post
use a relay with normally closed contacts, so when the switch opens, the relay will loose power, and close the contact, enabling the resistor. Check the voltage though, IIRC sensor supply voltage is 5VDC, but you should be able to find 5V reed relays.
Yeah, I just got off the phone with my buddy (who's good with electrical stuff), and I never realized that relay's can be wired two different ways. Instead of connecting to 87, I'll have to connect to 87a. Cool stuff!!!

And 5V you say??? I was going to test that out next, so thanks!!!! I'll find myself a relay tomorrow!

2001 F250 (Extended Cab, Short Box)
7.3L,
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460 BBF w/ Nitrous, C6, NP203, 14B FF Locked, HP D60 w/ Spun Inner C's, 5.13 Gears, 39.5" Boggers, Built Bumpers, Warn M12000, Built Front Radius Arms, Built Rear Shackle Flip (in progress), and much more...
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post #10 of 12 Old 03-10-2009, 10:24 PM
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Just dug up a wiring diagram, turns out the IVS does get +12V from a fuse, so just use a five terminal relay (with the 87a) and you'll be good to go.

Bill

1996 F250 SC/SB 4X4 XLT
1997 F250 RC/SB 2WD project
2008 F350 CC/LB 4X4 DRW Lariat, 3" cow catcher mod
2008 Ranger SC FX4
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Quote:
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I still say that those Dodge mirrors have as much business on a OBS Ford as yoga pants have on a fat chick...my .02
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