Reply
 
Thread Tools Display Modes
 
Old 12-04-2018, 02:16 PM   #1
New Member
 
Join Date: Dec 2018
Posts: 7
Question Limp mode...not even that. Idle only.

1998 AmTrans IH3800 T444E throwing a code that ain't on the ETS Diagnostic sheet:

SID0230 Idle Validation Switch. FMI 11 Root Cause Unknown.

Symptoms: Fires off normally. Dash trouble light and no RPM's over idle only when accelerator pedal is depressed...............just sits there and runs.

Q: WHERE is the IVS? Is it a part of what appears to be the APS plug on the pedal assembly? Or is it inside the engine compartment?

There are several codes associated with IVS. How to drill down onto the specific issue? Many thanks in advance.

Mucho gusto, JMC
Bandidoyanqui is offline   Reply With Quote
Old 12-04-2018, 02:38 PM   #2
Bus Geek
 
Join Date: May 2016
Location: Eastern WA
Posts: 4,378
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
Looks like it may be part of the throttle pedal assembly.

Idle Validation Switch (IVS)

A little searching found discussions of the same symptoms being resolve by replacing the throttle pedal sending unit.

No personal experience here just regurgitating what I found on other sites.

Good luck.
PNW_Steve is offline   Reply With Quote
Old 12-04-2018, 04:07 PM   #3
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 11,359
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
yeah that idle validation switch is a switch that makes the comoputer think your foot is off the pedal... if it thinks the foot is off the pedal but sees TPS read it wont allow the engine to rev up at all.. I can look in my service information for it if you like.. most things related to throttle are often that water dripped inside the bus and onto the accelerator pdeal and destroyed the electronics in it.. I can pull the wiring diagram for the pins on that connector if you need them.
-Christopher
cadillackid is offline   Reply With Quote
Old 12-04-2018, 04:07 PM   #4
New Member
 
Join Date: Dec 2018
Posts: 7
Hmmmmm. Yeah, I saw that PNW_Steve but one has title F-series and the other Econoline.......neither of which apply............necessarily. I'm punching above my weight class here, so it's all a bit Greek. Thanks for the link
Bandidoyanqui is offline   Reply With Quote
Old 12-04-2018, 04:11 PM   #5
New Member
 
Join Date: Dec 2018
Posts: 7
Thx for the reply cadillackid. The sensor on the pedal assembly is plug-and-play......easy enough to just switch out, but it seems that it has only been referred to in my research as the Accelerator Position Sensor vs the IVS. If they're one-in-the-same, then: slam dunk. But the code is referencing IVS. Is it a separate switch? Thx in advance. JMC
Bandidoyanqui is offline   Reply With Quote
Old 12-04-2018, 04:20 PM   #6
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 11,359
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
for those i would just get a used pedal assembly thats known good and swap it in. I didnt know the switch and the pedal position sensor were replaceable separately.. on my bus there is one connector thaty plugs in... its worth unplugging that and making sure the contacts are clean on it both sides.. and also make sure nothing is physically binding the pedal at all.. piece of dirt, debris, etc.. (debris shouldnt affect it.. but ive seen wierder things)


-Christopher
cadillackid is offline   Reply With Quote
Old 12-04-2018, 04:30 PM   #7
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 17,741
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
Quote:
Originally Posted by Bandidoyanqui View Post
Hmmmmm. Yeah, I saw that PNW_Steve but one has title F-series and the other Econoline.......neither of which apply............necessarily. I'm punching above my weight class here, so it's all a bit Greek. Thanks for the link
You'll get through this. Steve and Chris are two insanely smart folks.
__________________
.
Roll Your Own Build Thread
EastCoastCB is offline   Reply With Quote
Old 12-04-2018, 04:49 PM   #8
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 11,359
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
Here is the diagram for that connector on the pedal.. of course all 5 wires are violet colored lolol..

But the sensor and the Ivs are in the same connector

IMG_1999.jpg

IMG_2001.jpg

Christopher
cadillackid is offline   Reply With Quote
Old 12-04-2018, 06:37 PM   #9
Mini-Skoolie
 
Join Date: Oct 2014
Posts: 18
Yep, what they said. The IVS is merely a safety, in case something goes bad on the TPS side and goes to full throttle. It ensures you are actually pushing the pedal.

There are no replaceable parts. You have buy an entire pedal assembly.

They being said, it is unlikely the pedal is the problem. I work on medium and heavy trucks for a living. In the past 10+ years, I think I have had to replace two defective pedals. It is usually chafed wiring on the engine side of the firewall. And yup, all the fuel system wires are purple. As the schematics show, they do have the numbers stamped in them.

If you do elect to replace the pedal, make sure you get the correct one. I'm not sure of the year they changed. Newer ones stopped using the IVS and use a redundant TPS coils. They look identical and the wire connector is the same, but they are not interchangeable.

HTH
bigmackone is offline   Reply With Quote
Old 12-05-2018, 07:00 AM   #10
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 11,359
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
if you have or can get a multi-meter.. you can unplug the connector from the pedal.. and then put the meter in Ohms / continuity mode.



the bus can stay turned off..


on the pedal unit itself place one lead of the meter on terminal D. and the other on terminal F.. you'll likely have an empty terminal E.. its not used on the 444E.


when you press the pedal down you should see your meter show an open circuit.. (same as when you first turn it onto Ohms and dont have it connected to anything).


when you let off the pedal you should see your meter go very close to zero ohms or short circuit indication..



if this is the behaviour you get then your pedal assembly idle switch is good.. and time to check the wire harness like bigmackone suggests..



if the meter always shows open or short when you press and release the pedal then the switch is bad..



remember you are testing on the pedal assembly itself and not the wiring harness..


-Christopher
cadillackid is offline   Reply With Quote
Reply

Tags
aps, idle, ivs, limp mode, such a bummer

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 08:34 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.