Intermittent Engine Brake DD15

I had an 09 Cascadia with a DD15. I had a long running issue withe the jakes. One of the things I found out was that the jake solenoids and the fan solenoid shared a common hot lead and were switched on and off by their ground leads. It does sound like a wiring problem. Have you checked for SPN codes?

How did the delete cause you to only have low and medium jakes?

 

I’m currently having the same problem with my 2011 western star log truck had it deleted and have tried just about everything I can think of did you ever come up with a solution?

 

Did anyone ever figure out the problem? My truck is doing something very similar.

 

do you have any other electrical issues with anything on the dash when the jake acts up?

 

This is the code I get with my otr tool. (spn 3563 fmi 16). And I've changed intake manifold pressure sensor and its still doing the same thing it did not help.

 

No engine codes or anything. My biggest concern is the engine noise I'm hearing once the engine is warmed up. You can hear a loud rattle/echo in the engine and while the noise is present the truck rumbles and lacks power (almost seems deprived of fuel or something) this happens right up until 10th gear and then the noise/rattle goes away instantly and the power is restored. On a cold engine it does not make the sound or power loss at all only when warmed. It's hard to explain but another way to explain is as if there is some type of valve closed until 10th gear and the "valve" opens up and everything is perfectly normal. Is it my turbo? Egr valve? Do these affect the Jake's? I've tested egr actuator and nothing either. No engine lights, no smoke of any color, no fuel loss, turbo spools great, no over heating of coolant or oil. It is beyond me but it's driving me crazy trying to find it.

 

pull all the switch modules in the dash and in the bunk, pull the switches out of the module and look at the pins and traces.



the cascadia bunk switch is right under the bunk AC vent and the module is basically swiss cheese to let in local moisture/condensation. the bunk light switch module is multiplexed into the dash hazard light module, the bunk light switch if shorted will literally kill the jake if you can believe that bs .

it's never magic it's always either a connection where there shouldn't be one or missing a connection where there should be. dig in and rip the weeds out

better to go crazy trying to find it than go bankrupt letting it find you