Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
 
Old 01-16-2017, 10:55 AM   #1
New Member
 
Join Date: Jan 2017
Posts: 3
Throttle and start issue

If someone would like to direct me to where this subject has been addressed, I will gladly do the research myself...having said that,

1998 3800 DT444E

Throttle issue.

Last week, a helper started pulling wires under the dash/kick panel in my absence looking for a buzzer. All gauges cycle, but nothing responds when the key is fully turned. No start.

Checked firewall start relay.
Checked all the relays under the dash I could see.
No apparent loose wires.
Bypassed the neutral switch on the tranny.
Checked the Throttle Pos sensor on the pedal.
Temp wired in a push-button with a 20AMP inline fuse from the ignition switch.

The bus starts and runs well; however, when throttle reaches 1000 RPM, it goes back to idle with no further response. Got an engine light. Resets after each new start.

Hooked up a Prolink and got codes referring to the APS and IVS. Makes sense, but don't know where to start looking. Assume the two issues are related.

I have no schematic. Like Freightliner, there are many yellow colored wires to follow. I would be grateful for any direction.

Thanks

Jlane is offline   Reply With Quote
Old 01-16-2017, 11:00 AM   #2
Bus Geek
 
Join Date: May 2016
Location: Eastern WA
Posts: 6,401
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
What are the specific codes that you are seeing??
PNW_Steve is offline   Reply With Quote
Old 01-16-2017, 11:24 AM   #3
New Member
 
Join Date: Jan 2017
Posts: 3
Thanks, Steve

I am in the office right now, but I believe that I received 2 codes:

SID 230 FMI 11 and PID 91 FMI 7

I did not write them down. This is from memory. I will run over this afternoon and validate the numbers if you like.

Thanks for the quick response.

Jeff
Jlane is offline   Reply With Quote
Old 01-16-2017, 02:06 PM   #4
Bus Nut
 
Join Date: Jul 2013
Location: Maryland / Boulder
Posts: 347
Year: 1999
Coachwork: Thomas Built
Chassis: Saf-T-Liner MVP ER
Engine: CAT 3126b Rotella-Chugger
Rated Cap: 72
Jeff,

Not super clear on the issue but basically youre saying if you hit the gas, it won't rev? Assuming its a drive by wire throttle (no physical connection from pedal to engine) you checked the TPS and said it was good? I'd start looking for a wiring fault between the TPS and the engine computer or wherever the wires go from the pedal.
porkchopsandwiches is offline   Reply With Quote
Old 01-16-2017, 04:31 PM   #5
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,757
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
if you are using a prolink or are using the Navistar ServiceMaxx J1939 software you should be able to depress the pedal and see the TPS % go up and down..

part of your post says the bus wont start, another part says it starts withy no throttle response.

the TPS is in the pedal itself.. follow the wires from the pedal itself to see if any have been cut..

yes this is a drive-by-wire engine.

there is a DT-466E and a T-444E.. not sure which you have? you marked DT-444E.

the control system is ver ysimilar for both..

if ther bus wont start at all its usually where you disconnected a door sensor / Buzzer and the yare wired to the starting circuit so if an emergency door or window is open a buzzer will sound and the bus wont start..

if the bus does start but just wont respond to throttle pedal thats when you start looking for issues in the wiring from the throttle pedal itself.
-Christopher
cadillackid is online now   Reply With Quote
Reply

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 02:58 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.