I need some help. My Jake brake isn't working. I turn it on nothing not even a indicator light on dash comes on. Cruise works I can set it at idle and raise rpms.
The engine is a c13 Lee15325 truck is a 386 Pete vin 750952
I replaced the injector harness, put 6 new injectors in, and ran a overhead. The jakes didn't work prior to this but after completing the work jakes still don't work.
We hook the computer up and no codes show.
I thought it was the clutch switch but cruise control works. We even replaced the throttle sensor and wiring harness.
Any ideas
Jake Brake not working Cruise control working
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Tama Mai Hawaii Nei, Oct 1, 2020.
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Do you have power to the dash switch? There is no light on the dash. Does the light on the on/off switch come on? If the switches are used daily, they do not last forever and I replace quite a few.
Next step is to connect CAT ET and check to make sure all the switches are responding correctly in the ECM.blairandgretchen and pushbroom Thank this. -
I get power to the dash switch. The CAT ET showing no faults. Originally it showed the number 1 injector had issues that lead to just replacing all the injectors then we noticed the wiring harness was screwed up.
After we did all the work everything was fine no faults, looked to see if jake is on the brake peddle but it is set for the throttle. -
stillwurkin Thanks this.
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CAT Et wont show any faults if the switch doesnt work.
The switch input needs to be monitored in CAT ETblairandgretchen, Tama Mai Hawaii Nei, AModelCat and 1 other person Thank this. -
Tama Mai Hawaii Nei Thanks this. -
The jake can work just fine with the cruise on. Its a parameter that can be set.
Like Pushbroom says, use ET to see if the ECM registers an input from the jake switch. It won't throw faults for a switch (and related wiring) issue since the ECM only recognizes voltage or no voltage.blairandgretchen, pushbroom and Tama Mai Hawaii Nei Thank this. -
So an update used the ET program at Rush they said all parameters are where they're supposed to be. The jake is set to manual so should work on the peddle.
I tried turning cruise off completely and still dont work. Im guessing its wiring issue.
PSA: If you are running I15 between Vegas and Cali and you come up on me I apologize now in advance. I come down those grades in 8th gear and Cajon Pass in 7th. My jakes still not working and I don't want to smoke my breaks. -
clutch switch?
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