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Old 04-03-2013, 01:28 AM   #1
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Exhaust Brake Issue?

Just picked up a 2003 Jayco Avatar 39' diesel pusher. Our third diesel pusher, so I'm pretty familiar with the whole thing.

Spartan chassis, Cummins ISC / Allison six speed.

Problem is that the Jacobs E-brake exhaust brake is inop. I'm assuming that it is a switch problem, because when the dashboard "exhaust brake" switch is activated, nothing happens. The actual valve in the exhaust pipe is free, not stuck.

Wouldn't the transmission show "2" on it's annunciator panel when the exhaust brake is actuated, and the trans aggressively downshift? That's how it worked on our other diesels.

Ed
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Old 04-03-2013, 05:24 AM   #2
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Yes, it's supposed to select a lower gear and energize the solenoid for the Exhaust brake. I'm not that familiar with the '03's but are they still using an air solenoid to actuate the exhaust brake? The MD3000 series transmissions and WTEC-II/III/IV controllers have a seperate circuit specifically for exhaust brake operation.... and it does differ amongst them. I only have wiring schematics for WTEC-II controllers on an MD3060 - but it may be of use to you.
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Old 04-03-2013, 05:38 AM   #3
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Here you go Ed. This may not be entirely accurate for yours... but will probably lead you in the right direction.
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Old 04-03-2013, 12:51 PM   #4
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Thanks! Will dig into it...
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Old 04-03-2013, 04:20 PM   #5
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It does not necessarily downshift to "2" - the target gear depends on the programming. Some were set up to target 4th gear instead of 2nd, and it is even conceivable the previous owner had the automatic down shift turned off. You can get the programming changed to suit you, though.
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Old 04-03-2013, 04:37 PM   #6
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Thanks Gary. I'm troubleshooting the system, and need to know what indications I would have when the dash switch is on. On my previous RV ,a Winnebago Journey, the Allison keypad would show "2" when the exhaust brake was on and the throttle was closed. As you know, that indicated that second gear was preselected, and eventually would downshift to 2nd.

On the current coach, when the ex brake switch is on, nothing happens, no indication, nothing...

Guess I'll start at the dash switch and work back from there?
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