Engine Brake Not Working

[Mike & Nancy]

Just had ECM replaced and now Engine Brake (Jake) does not work. New ECM was programed to show unit has engine brake. Has anyone encountered this situation and most importantly what is the fix. Cummins in Irvine could not get it to work......suggested going to repair facility that is familiar with Monaco chassis and wiring. Very strange it work before ECM was changed.

[Carl & Shelly]

Just wondering what engine is in your coach and why did you have to replace the ECM?
Carl

[hardy1000]

Quote:

Originally Posted by Mike & Nancy Just had ECM replaced and now Engine Brake (Jake) does not work. New ECM was programed to show unit has engine brake. Has anyone encountered this situation and most importantly what is the fix. Cummins in Irvine could not get it to work......suggested going to repair facility that is familiar with Monaco chassis and wiring. Very strange it work before ECM was changed.

Mike,
Try calling Colton Truck Terminal Garage in Colton, they work on Monaco Chassis and engines. They did work on my last Monaco and no more problems.

http://www.coltontruckterminalgarage.com/

[Mike & Nancy]

Carl.... We have the 500 ISM. So far in the first 7200 miles the Turbo, Turbo actuator and ECM have been replaced. ECM replaced because engine would not start....it was showing "No Data Communication" on the dash. All problems so far have been Engine related........not too much fun.

[Mike Canter]

Mike, if it worked before the ECM change but doesn't afterwards then it is in the setup of the preferences of the ECM software, a bad ECM, or a ECM plug not seated all the way. I would go back to the place that installed the ECM unit and insist that they fix it. Not as sure about the Cummins ECM but when I had my Detroit ECM replaced they didn't initially set the preferences correctly on mine. I called Ron Brown at Pacific Power Products just down the road from Monaco in Oregon and he emailed me the correct setup for my motor in a MH then went back and had them hookup a laptop and set mine correctly. Monaco has the engines installed and setup in the chassis by Pacific Power Products. before Monaco puts the body on. Pacific Power Products: Locations

The other option is to have them try another ECM and see if it fixes it. Your new ECM is under warranty and you should be able to take it back to any authorized Cummins repair place and have them honor the warranty,

Something for everyone to understand. Since there are so many different types of vehicles and MHs these diesel motors can be put in there are many different configurations for the ECM unit. Sometimes you have to order a specific part number ECM for you MH or the other way is to have software variable options within the ECM which can be turned on and off depending on what vehicle the motor is in. If you ECM is working somewhat when you take it in for repair you can get them to hookup a laptop to the ECM and download the preferences and print them out so you can setup the new one the same and keep them on file. On my motor I lost control of my cruise control by the VORAD radar because they missed setting one of the options for that configuration. Took it back and they corrected the problem in a flash. There are a lot of preferences that can be set in those ECMs so it is easy to miss one.

[Mike & Nancy]

Mike........Thanks for the info. I took it to Cummins Cal Pacific in Irvine and they did all diagnostics via their computers......could not find problem......suggested I take it to repair shop familiar with Monaco chassis. That suggestion really confused me since the Jake worked prior to ECM change. I will take it to shop that replaced ECM. I agree with you on being something with settings on new ECM.

[Mike Canter]

Mike, here is something to consider. There are two ways for a j\Jake Brake to work. The ECM can be programmed to engage the Jake Brake when you let up on the accelarator or via a separate foot switch. Trucks are set up so that they engage when the foot is lifted beacsue they have a clutch pedal and only have two feet so they can't use a foot switch. MHs are programmed to work off a foot switch. Maybe they have it set up for a truck. have you put the Jake on HIGH and see if it comes on when you let up on the accelarator?

You would think that Cummins with a laptop hooked up to the ECM can tell if the Engine Brake foot switch is sending a signal to the ECM when you depress it and also if the Engine Brake HIGH/LOW switch is working. There is always a possibility that the micro switch inside the foot switch is bad and just happened to fail at the time you took it in (yea, sure). Also there is a Engine Brake fuse in the FRB. Actually two fuses, one for the Engine Brake brake lights and one for the Engine Brake.

[Mike & Nancy]

Mike

Cummins did find that ECM was set for clutch, but that did not change anything. I have looked at wiring diagram for Engine Brake and I see a 20 amp fuse in what looks like rear electrical box (engine comp.-right side). What does FRB mean? Thanks for all the suggestions.

[William Willard]

FRB is Front Run Bay -- It`s the front, drivers side bay, where most of the fuses are -- Bill Willard

[Mike Canter]

Mike, does that Cummins dealer still have your old ECM lying around? If so they should plug it in on their test bench or put it back in your MH and get a print out on how it was originally setup on preferences and set up the new ECM the same way. If they don't have it then you need to get a print out of how your new one is setup then call Ron Brown at Pacific Power Products and get the setup emailed from him and compare the two.

I am sure that the ECM is not set up on the Jake Brake for foot pedal control. If it is setup correctly and it still doesn't work and they say they cannot monitor the foot pedal input in the ECM then they need to install another ECM unit. It maybe they installed the wrong part number ECM into your MH. With Cummins there might be a special part number when used in a MH. Again Ron Brown at Pacific Power Products can tell you what he puts in them new when they built your MH.