Workhorse Diagnostic Assistance

Posted by Alan 10/06/2016 22 Comment(s)

We offer Technical Assistance for your Workhorse RV Chassis. This technical support includes Drivability, Auto Park Brake, Steering and Handling, and Electrical issues. Our staff is experienced and helpful for repair shops around the country, or RV owners that just need a little guidance. We also offer a full range of Genuine and Aftermarket parts for the Workhorse Chassis through our parts distribution site www.urvp.com. Please leave us a question or feedback about what we have done or can do to help you.

22 Comment(s)

Steve Barka:
01/27/2017, 04:57:40 PM, Workhorse 8.1L gas 2004.
Reply

Starter won't engage when temperature is below 40 degrees. Battery tests good, cleaned cable connections, tried auxiliary battery switch, clicked but no help. Jumped starter solenoid and started right up. ???

Alan:
01/30/2017, 03:26:34 PM

Steve, That is a good one, I would test at the starter relay in the under hood fuse block, check and see with the relay removed to see if you have a ground being provided to pin 85 or 86 when the key is turned to the crank position. If you do see a switched ground at one of those pins, then see if you have 12 volts at the other pin either 85 or 86 when the key is in the run position. Do these tests when the coach does not start. Let me know what you find.

Pete Bustabad:
03/28/2017, 12:12:48 PM
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Do you have anything like the stabil-air suspension kits for w-22??

Alan Sanders:
03/30/2017, 09:13:43 AM

Steve, We do not have anything that is like the Stabil-Air kit that Workhorse previously had available. The suspension kits we offer do not use air bags, you can see those kits here http://www.brazelsrv.com/Package-Deals/Suspension-Packages/Workhorse-W20-22-24-Suspension-Packages .

Keith Conley:
05/04/2017, 08:18:01 AM
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Hello, I have a 2008 Winnebago Destination 39W, on a 2007 UFO Chassis. Of course it's a 8.1 with a Allison 6 spd. I want to know, what the torque value is for the Koni 99B-3209 front shocks, upper and lower. I need to know what that value is for tighten. Also, I need to know the Torque value for the rear's as well. I have the 8805-1002. Any help would be appreciated. I look forward to seeing you guy's on the trail, as I have some upgrades I may need. You have come very, very recommended. Thanks

Alan Sanders:
05/17/2017, 11:01:14 AM

Keith, Sorry for the delay in response. The torque for all the 3/4" grade 8 bolts are 420 lb ft with dry threads, and 320 if the threads have anti-seize or other lubrication on the threads.

Norman Gunderson:
06/19/2017, 05:42:41 AM
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I have a 2008 Workhorse 8.1 that seems to have the wrong ppm programed in the ECM. The speedometer reads right about 10% faster than it should compared to my GPS. The milage is out also. Can you reset the ppm to correct this? I still have the stock tire size, so I think it has been this way since new. I just bought it a year ago and would like to get it to read the correct speed and distance. Thanks for any info.

Alan Sanders:
06/19/2017, 07:14:52 AM

Norman, Could you email me your VIN so I can see what you have? Once we have that, we can discuss what is going on. Please email the VIN using the contact form. Looking forward to helping out.

Mike@ Sals autoER:
06/29/2017, 09:30:47 AM
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I am working on a 2002 Workhorse W22, 8.1. The owners were heading home to Wisconson in this rig they had purchased at a small "Mom and Pop" car lot in Ocala, Florida. They made it to our sister shop in Gainesville, Florida, and the rig went into " reduced power" mode, with no throttle response. The tech there cleaned the T-body, and it seemed good, until they got back on the interstate, where they limped it to our shop. I scanned for codes, and got the dreaded P1518. It was late on a Friday, and I really have no info on that chassis, so they were going to try a local RV dealer, but got little response. They flew back to Wisconson, and left the rig with us. Without a wiring diagram its tough to diag, so did the next best thing...throw parts at it. Replace the throttle pedal, no change, tried a new t-body, nope, then the TAC module itself. Nothing seems to help, but we can return the pedal and t-body. I am trying to check the Data lines from the TAC to the PCM, but cannot verify which ones at the PCM are the proper wires. I have been attempting to use a diagram from the same year 3500 Van with the 8.1, but am struggling with which "orange/Black, cir. 1061" and Dark Blue/White cir. 774" is at the PCM. The PCM is getting no info from the module, but cannot determine if the module isn't sending, or if the PCM isn't recognizing and processing it. There is very limited throttle response, maybe from 800 RPM to 1600 RPM, with the throttle wide open. The rig is a 2002 and only has 4750 mikes on it. I have looked for evidence of rodents, but found none. Any help/direction would be appreciated. We are getting no help from the RV dealers in the area. Thank you! Mike

Alan Sanders:
06/29/2017, 11:56:13 AM

Mike, I have sent some information to your email.

James Addison:
06/17/2018, 02:25:56 PM

If like to get a hold of the wiring diagram also... Having same issue same motor.

Alan:
06/18/2018, 08:00:35 AM

James, I have sent the diagnostic information for that code to your email.

Crosby Kennett:
08/07/2017, 07:27:27 PM
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Hi Alan, I have a new to me workhorse chassis with a Fleetwood Terra on it. I replaced the headlight switch and started having problems with the headlights. After headlights turned on for about 30 or 40 seconds the headlights cut out (both) and flicker and don't operate. I took it to a reputable truck shop and they said the DRL module was NG so replaced the whole dash wiring harness. $$$ and still have the problem. They said the switch tested okay. With headlight switch in intermediate position DRL provide reduced power to headlights with no problems. Turn on the headlights and you're okay for a very short while until they all kick out. Any advice would be appreciated. Thank you. Crosby

Alan:
08/08/2017, 12:08:14 PM

Crosby, Could you give me a call so we can discuss? There are some Q&A's that we need to go over. 360-736-9494

Steven Johnson:
08/31/2017, 05:58:38 PM
Reply

2008 Winnebago Destination on a UFO chassis. Having problems with the auto brake release. When the yellow button on the dash is pushed to release the brake you can physically feel the brake release but the dash displays "parking brake on" with a red ! flashing. When this occurs my brake lights illuminate and stay on all the time. No one seem to know how to fix this problem. Coach has been in the shop for two weeks, need help.

Alan:
09/18/2017, 07:25:49 AM

Steve, Please contact us VIA phone to discuss the issue. 877-786-1576 Ask for Alan.

Ken Horn:
11/16/2017, 09:10:14 AM
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I have a 2005 Workhorse P32 with the J72 brake system. It is a Winnebago Sightseer. We were in a campground for about 2 weeks when I started the engine. The brake pump started to run immediately. I did a brief experiment to determine that the RV is moveable but, sine I didn't have to go anywhereI. shut it down. There was no indication of a problem prior to us parking. Any thoughts?

Alan:
11/16/2017, 09:14:59 AM

Ken, Sounds like the parking brake module or the parking brake pump relay are having an issue. I would unplug the controller and start the engine to see if the pump still runs. If it does then you need a pump relay, if it does not then the controller is the issue. Either way I would recommend the US2078 kit that will replace the controller, and install a line lock. This is so the brake will not apply while you are driving the coach, and burn up the 3K$ brake on the back of the transmission. We have the kits in stock with free shipping.

Ken horn:
11/20/2017, 11:53:11 AM

Replaced the pump relay. No difference. Read the install instructions for the kit. Mine is a P32 chassis and the mounting instructions are for a 24 chassis. Not clear----does the kit replace the proportional solenoid? If not, would failure of that solenoid cause the motor to run?

Ken horn:
11/20/2017, 11:58:43 AM

In addition, why does the blue hydraulic line need to be disconnected at both ends? Can't it be disconnected from the block and then connected to the new unit?

Ken horn:
11/20/2017, 11:58:45 AM

In addition, why does the blue hydraulic line need to be disconnected at both ends? Can't it be disconnected from the block and then connected to the new unit?

Alan:
11/20/2017, 12:58:41 PM

Ken, You are correct, there are no instructions for mounting the controller on a 2005 P32 chassis. However it comes with two self drilling screws and can mount where ever the wires reach. All the rest of the installation instructions are the same. As far as the blue hydraulic hose, that depends on how the mounting arrangement ends up for the Ultra Save valve itself, sometimes it is better to turn the hose around due to one end having a 90 degree and the other end being straight.

Ken horn:
11/20/2017, 01:30:33 PM

OK. What about my question about the proportional valve?

Alan:
11/20/2017, 02:57:19 PM

Ken, Our kit does not replace that valve. You are correct, if you are having an issue with that valve that could make the pump run on and not build pressure, but the pump would not run with just ignition on and not in drive if the controller was operating correctly, and that valve gets it's 12 volts from the controller.

Ken Horn:
11/21/2017, 07:41:40 AM

So then, ,the us2078 kit should solve my problem? I noticed that the instructions said nothing about bleeding the system. How is that done?

Alan:
11/21/2017, 07:56:21 AM

Ken, Yes, the US2078 should cure the issue you are having. The system is self bleeding, just cycle the pump a few times.

Ken Horn:
11/29/2017, 09:47:05 AM

I have installed the kit and everything seems to be working just fine. It was quite a challenge to mount the parts on this P32 chassis. Ended up using stainless steel pipe clamps to hold the valve in place. For everyday driving maximum safety, should the valve be in the bypass or non-bypass mode? Thanks for all your help.

Alan:
11/29/2017, 12:45:20 PM

Ken, Glad to hear that you are operational again! You would want the red knob pressed in and turned clockwise.

Gary Croson:
02/28/2018, 04:53:33 PM
Reply

Hello Alan, I purchased a 2003 Winnebago Adventurer 35U workhorse chassis 8.1. I drove it 2hr after pickup and it ran fine plenty of power. I stopped and filled the tank and it started running rough and would not do over 10-15 miles an hr. I stopped on the side of the road for about 5-10minutes with the motor off and it restarted just fine and no miss and plenty of power. The next several days started right up in the driveway and we went to have the propane tank filled and were on the road for about an hour cut the motor off and it took about 20 minutes to fill the tank. I started the motor and it ran very rough and could not go more than 10-15 miles an hour. I stopped on the side of the road for about 10 minutes with the motor off and it started right back up and ran like nothing happened plenty of power no miss. I have a code reader and the codes were P1516 and P0151 . Before I go and start throwing a lot of parts at it what would you suggest. I have checked at the throttle body and the Tac for broken wires by pulling each wire and doing the wiggle test while it is running but no luck in having it fail vin # 5B4MP67G733364685 The motor home has 18530 miles and I have all the inspection papers and work done. I notice the spark plug wires were changed twice at 14000 and 15000 mile because of cyl 5 and 6 wires were bad. Any help would be greatly appreciated

Alan:
03/02/2018, 11:06:18 AM

Gary, I have sent you some diagnostic information via your email for the P1516 code. This will be the issue if you had a "Reduced Engine Power" displayed on the dash. Usually it will come back to the TAC Module itself, but it could be several other things also :-) Take a look through the diagnostic I have sent and see if that helps to narrow it down. I would have posted that information here, but it does not copy and paste well for the format of it.

John Olszewski:
03/16/2018, 09:30:31 AM
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I have a 2005 Winnebago ( VIN 5B4MP67G453403770 ) on a Workhorse chassis. A 5 speed Allison transmission. The connector came off of the OD switch. The cable labeled OD SW has two connectors on it. Would you know which connector goes on the OD switch? Switch has 6 lugs. One connector has a black and gray wire. The other connector has a black,purple,orange, and gray wire. Thank you very much. You have my Actia instrument cluster doing the 105297R repair.

Alan:
03/16/2018, 11:13:44 AM, www.brazelsrv.com
Reply

John, I have sent you the wiring diagram for your overdrive switch to your email. Please let me know if you have any further questions :-)

John Olszewski:
03/21/2018, 04:13:43 PM

Sorry,but I did not receive any wiring diagram yet. Thank you,John

John Olszewski:
03/22/2018, 10:39:28 AM

Could you please email me the wiring diagram again. Thank you,John.

Steve Sensenig:
03/24/2018, 05:24:01 PM
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2005 Damon Intruder on a Workhorse chassis with the Chevy 8-cyl engine. A couple months ago (we've been relatively stationary since, trying to solve this problem so we can continue traveling), pulled up to a stop sign after an uneventful 2-hour drive, and the engine stalled. After that, it would stall at idle, and I would have to give it gas to stay running, then "two foot" (one on the brake, one revving the engine) to put it in gear and pull away. It would run ok once I got up to speed, but acceleration was pitiful and it still felt a little rough. And as soon as I came to a stop, if I didn't "two foot" it again, it would stall. So far, we have replaced all the plugs and wires at one mechanic, had another convince me it was a bad tank of gas, so changed the fuel filter and put fresh gas and additive in, but the problems still remain. The first mechanic thinks it might be related to the EMC as they unplugged a couple of sensors and said the computer didn't throw any codes. Any other thoughts? And if it is possibly the EMC, how does one get it tested and/or replaced? I can't find information online about it, and the mechanic claims he called around with a part number Workhorse gave him and couldn't find a replacement computer anywhere. :( Not exactly what I'm wanting to hear, ya know? ;) Anyway, any advice you might have would help tremendously. steve :)

Steve Sensenig:
03/24/2018, 05:29:25 PM

Sorry.....ECM, not EMC ;)

Alan:
03/26/2018, 07:36:12 AM, www.brazelsrv.com
Reply

Steve, I would check the injector and coil harnesses. If there are no codes, it is probably the power supply to one of the banks on the engine. The computer sends grounds to the coils and injectors to fire them, there are two fuses the supply the left and right bank constant power to each of the coils and injectors. I would bet there is an issue with one or both of the power supplies to those harnesses. I have seen many things that caused issues similar to this, one was the A/C compressor pulley rubbing on the harness, and also some failed splices, plus stretched wires. Try moving the harnesses on the top of the engine on both sides with the engine running to see if you can make it run better with the movement of them.

Dean Schmidt:
04/16/2018, 02:13:31 PM
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2004 Workhorse Chassis p32 under a fleetwood tiera. Cruise control is not working as it should. When pressing the "SET" function at speed I get a momentary (slight rpm) boost as I might if I were setting the cruise. However a release of the SET switch the vehicle goes back to manual speed. Continuous pressing the the SET switch does a this momentary rpm adjustment but I cant get the Cruise to go into SET Mode. All fuses have been checked and the brake switch has been checked as well. So wondering if this issue is in the TAC module or other? thanks in advance. Dean

Chuck Shrode:
04/26/2018, 03:29:48 PM
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I purchased a (Harbor Freight) "Zuric ZR8" OBD2 Code reader, specifically for use with the Workhorse Chassis, W22. After making the connections, the code reader indicated that there was compatibility issues with that vehicle. I do not understand if the problem is the "reader or the vehicle. I did try to update the software and spoke with a representative, who claimed the reader was new and that no updates were available. Question: is the subject vehicle compatible with OBD2, other than just for smog testing?

Gary Croson:
05/31/2018, 05:51:22 AM
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Hi Alan ,would you have vacumm routing for a 2003 winnebago adventurer 35u w22 . The dash a/c stops blowing when climbing a steep hill.It will come back on after grade. Thanks Gary

Alan:
05/31/2018, 07:35:23 AM, www.brazelsrv.com
Reply

Gary, There really is no vacuum diagram, but usually the vacuum is taken off the back of the intake manifold and ran directly up to a vacuum ball under the hood. This is done by the body builder. Now also, the A/C compressor clutch is set to be disabled by engine load and throttle position. That is done that way to provide as much of the engines power as possible to the wheels when you are demanding it.

Gary Croson:
06/02/2018, 04:07:55 AM

Thanks for getting back.

Linda H:
06/19/2018, 03:01:48 PM
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I have a 2003 Winnebago Adventurer 33V on a workhorse chassis. I need new and hopefully brighter headlights. Any suggestions as to where to obtain?

Alan:
06/19/2018, 04:17:36 PM, www.brazelsrv.com
Reply

Linda, Normally headlights are not something that we get into, due to them being a body builder part. However I do know that some coaches are not getting enough amperage to the headlights through the factory wiring. So I would suggest starting with checking to see what voltage you have at the headlights when the engine is running and the lights on. You should have at least 13.5 volts (or close to it) at the headlight connector. If you do not, then I would suggest wiring in a relay to each headlight so that you get proper battery voltage to them, making them as bright as they can be. Connecting the relay... - Cut the power wire to the low beams about 6 inches from the connector on the headlight - Install that cut wire onto pin 86 of the relay - Ground pin 85 - Connect pin 30 to a 30 amp fuse or breaker - From the breaker or fuse straight to the battery - Last connecting pin 87 to the cut wire left on your headlight connector

David A. Griffin:
07/05/2018, 01:51:12 PM
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Hi, Alan. I have been trying to reach you by phone (had left three messages on voice mail) to follow up on my telecon with you about my autopark issue on my 97 Fleetwood Storm (I had given you the last eight if the VIN). Would you prefer to call me back at 719-687-0911 so I can report on what I found out after your suggestions, or do you want me to email you the findings? Look forward to hearing back from you one way or the other. Thanks.

David Griffin:
07/10/2018, 01:33:26 PM
Reply

Sorry I missed your call today. I left you a voicemail. When you get a chance please call me at 719-687-0911.

DAVID GRIFFIN:
07/11/2018, 11:14:09 AM

Alan: I just sent some info as follow up through your CHAT LINE about what we discussed concerning the LIGHT SWITCH.

Roger Heikes:
07/14/2018, 09:29:30 AM
Reply

Hello Alan, 2003 Winnebago Adventure 35U on Workhorse W-22. Have lost operation of drivers side low beam. All other lights work and function. When switching between low and high the drivers side acted like the element was going until if finally failed. A check of the bulb found it to be good. Replaced headlight fixture as I found one mounting tab missing. Also, I had just replaced headlight switch along with dimmer switch. Have since reinstalled original headlight switch. Same problem continues. Any suggestions would be appreciated before I did into this. Do the low and high beams operate thru some kind of relay?

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