Jake Brake not working Cruise control working

TechPL · Oct 7, 2020

Tama Mai Hawaii Nei said: ↑

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
Click to expand...

Full VIN please

Thank you

TTNJ · Oct 7, 2020

Brake foot valve sticking?

lester · Oct 8, 2020

When they are hooked in with cat ET they should be able to see when you toggle the Jake switch on and off. That would help narrow down the search. If it shows it on then you know the problem is after the ECM. If it doesn't it could just be a bad switch or wiring problem before the ecm. I think anyway

north60 · Oct 8, 2020

The reason I mentioned clutch switch is because when you press the clutch it usually shuts off your jake (allowing you to shift gears without slowing the engine down) it also usually kicks out your cruise control as well.

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