Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Winnebago Industries Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 07-27-2021, 02:25 PM   #1
Junior Member
 
Join Date: Feb 2017
Posts: 12
03 Winnebago Itasca Horizon will not start won't start 😞

I have a 2003 Winnebago Itasca Horizon (IKP34HD) with a 330 HP CAT Diesel (HEP20826). that will turn over when attempting to start but will not (start). Good batteries and connections all checked good. Additionally, there is a no yellow check engine light when the key is turned to the first (before cranking) position and the only gauges that energize are the air and fuel gauge. All the other normal just prior to starting warning lights illuminate fine. The (mobile) diesel mechanic that I use could not get his scan tool to "see" the engine to look at diagnostic codes.

His/our research determined that the engine ECM is either not getting power and or the engine ECU has failed. The mechanic went through all CB's and checked relays associated with the ECM and found them all good. Unfortunately, he has other scheduled jobs and will not be able to come back for a couple weeks.

Additional online research indicated that the electrical connector (to the ECM) should power to pins 52 and 53 (unswitched) and key on (switched) power to pin 70.

If you're still with me so far... 😂, My question is, has anyone here had a similar issue/diagnosis and eventual repair of the that issue? I would like to hear from you if you did. While the mechanic is out of pocket for a couple weeks, I'm probably going to check those pins for power before ordering a replacement engine ECM to get the ball (in this case the RV, 😉 ) rolling. Thanks for any pointers or advice anyone could provide.
r, Brett
Flares is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-27-2021, 03:02 PM   #2
Senior Member


 
Winnebago Owners Club
Join Date: Sep 2015
Posts: 1,005
Quote:
Originally Posted by Flares View Post
I have a 2003 Winnebago Itasca Horizon (IKP34HD) with a 330 HP CAT Diesel (HEP20826). that will turn over when attempting to start but will not (start). Good batteries and connections all checked good. Additionally, there is a no yellow check engine light when the key is turned to the first (before cranking) position and the only gauges that energize are the air and fuel gauge. All the other normal just prior to starting warning lights illuminate fine. The (mobile) diesel mechanic that I use could not get his scan tool to "see" the engine to look at diagnostic codes.

His/our research determined that the engine ECM is either not getting power and or the engine ECU has failed. The mechanic went through all CB's and checked relays associated with the ECM and found them all good. Unfortunately, he has other scheduled jobs and will not be able to come back for a couple weeks.

Additional online research indicated that the electrical connector (to the ECM) should power to pins 52 and 53 (unswitched) and key on (switched) power to pin 70.

If you're still with me so far... 😂, My question is, has anyone here had a similar issue/diagnosis and eventual repair of the that issue? I would like to hear from you if you did. While the mechanic is out of pocket for a couple weeks, I'm probably going to check those pins for power before ordering a replacement engine ECM to get the ball (in this case the RV, 😉 ) rolling. Thanks for any pointers or advice anyone could provide.
r, Brett
I have never experienced this but have seen lots of posts that have. Incorrect or no voltages to the ECM do some strange things.

You say all the other instrument panel lights come on as normal EXCEPT the check engine light? That does indicate an ECM issue as that should light up anytime the ignition is on and the engine is not running. Mine, when I turn the key on ALL the lights come on, 30 seconds maybe if the engine is cold, air is low, etc including the check engine light. If I shut it off, after driving, all is warm, air is up jacks in right position, etc, and then I turn the ignition back on after say 15-20 seconds, the only light that comes on is the Check Engine.

Voltages do really weird things. Last winter, I would be driving down the road and all the lights would go into what they call a "Chase" pattern. Engine continued to run fine, no performance issues. I'd pull over, set the park brake and put in neutral and they would stop. Go back to normal. A couple times I did have to shut it off and restart. Researched and researched and everything always came back to a voltage issue. Then I notice that often, not always, after being parked for the night, I would get 20 miles down the road and it would happen. Someone suggested battery issues. When I got home I tested them all. Chassis batteries were fine but 2 house batteries were completely shot. One at 20% capacity and one at 10% capacity. PO had put a new one in and that one was good. As you know 1 good battery and 2 bad batteries = 3 bad batteries. I replaced all three with a matched set and good ever since. Came to the conclusion that upon starting, the alternator charged the chassis batteries first, then when they got up to voltage, flipped the bird and started charging the house batteries, which drug the voltage down and sent the ECM into the WTF mode causing the chase lights.

Good luck, Check all the pins for tight, clean with contact cleaner, if you do buy an ECM try and find one you can return if the is not the problem.
__________________
2006 Winnebago Journey
39K
Cat C7
amosnandy is online now   Reply With Quote
Old 07-27-2021, 05:37 PM   #3
Senior Member
 
Join Date: Aug 2015
Posts: 758
Well, do you have power on pins 52 and 53, and do you have power on pin 70 with key on.

Find all fuses associated with these 2 items. ECM 12v constant and ignition. Try just replacing the fuses.
It's important to have good grounds as well

If you have all that, it's most likely a dead ECM.

You can remove it yourself and take it to a CAT dealer and have them bench test, and get a new one programmed to specs required.

Or sniff around the internet and find a ECM refurbish Co. And send to them.
Wild Card is offline   Reply With Quote
Old 07-27-2021, 06:15 PM   #4
Junior Member
 
Join Date: Feb 2017
Posts: 12
Appreciate the comments. Will look at tackling this repair in the next few days and post what I found. Thanks.
Flares is offline   Reply With Quote
Reply

Tags
cat 330, ecm, horizon, itasca, winnebago



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Recently acquired an 03 Camelot... lots of issues 😞 Necromancer Monaco Owner's Forum 15 05-12-2021 09:41 PM
Itasca Horizon :: 2002 Itasca Horizon 34HD jhanan iRV2 Owners Registry 0 10-29-2017 06:31 PM
Auxiliary Batteries vs. Main Batteries - which is which? Batteries dying.......😞 Napabeth Fleetwood Owner's Forum 16 08-05-2015 12:54 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 10:47 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.