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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #1  
Old 05-25-2018
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lucaswillemse lucaswillemse is offline
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Default Engine Brake on S60 95 WB

On our last trip the engine brake would not come on. The transmission downshifted as before to 4th but I could not get an indicator light or felt engine braking as before. Does anyone have any guidance on where to start looking? Are there circuit breakers for this or would any problems show on the engine computer?
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Lucas Willemse
Paramount, CA
1995 WB 42
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Old 05-25-2018
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Randy Dupree Randy Dupree is offline
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Therenis several relays,but i'm not sure where they are on your 95.
My 2000 uses mini relays.
But,several of us have had the same problem,and i think all of us needed a new TPS.
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2000 LXI 43
Bainbridge,Ga.
Port St Joe Fl.
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Old 05-25-2018
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Default Engine brake

Randy I know where the relays are. There are three in the front electrical panel. From some of the prints I have the power for this comes from the ignition and I have confirmed the power is supplied and the transmission downshift is working.
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1995 WB 42
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Old 05-25-2018
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Quote:
Originally Posted by lucaswillemse View Post
Randy I know where the relays are. There are three in the front electrical panel. From some of the prints I have the power for this comes from the ignition and I have confirmed the power is supplied and the transmission downshift is working.
OK,good.
My first thought was TPS,and it still is.
Andy Harman may jump in,he has the same coach,hes had tps problems too.
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2000 LXI 43
Bainbridge,Ga.
Port St Joe Fl.
www.buybyebluebird.com

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Old 05-25-2018
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Default Engine brake

TPS, throttle position sensor, this made me think of the "mode" control switch on the transmission selector. I have been running with this switched on to get the cruise control to work properly and that is when seems all this started. Is it possible this affects the engine retarder? and should be switched to "normal"?
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1995 WB 42
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Old 05-25-2018
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Quote:
Originally Posted by lucaswillemse View Post
TPS, throttle position sensor, this made me think of the "mode" control switch on the transmission selector. I have been running with this switched on to get the cruise control to work properly and that is when seems all this started. Is it possible this affects the engine retarder? and should be switched to "normal"?

The cruise and the jake should work with the "mode" on or off,no change.
My coach had weird things happen with the cruise control,switching off whenever it wanted too.
Same with the jake,jake would work,then not work.
Shut the engine off and the jake would work,i guess it reset somehow?
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2000 LXI 43
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Port St Joe Fl.
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Old 05-25-2018
dnmarkham dnmarkham is offline
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Check the switches.

Mine would downshift but not engage unless it was set to medium. I checked the switches and they showed proper continuity so I moved on to the relays. After changing the relays, I still had intermittent problems. What I found out is that continuity isn't a good test of the switch, It also has to move enough current to trip the relay.

If it's downshifting but not engaging I would check the switches. Shoot a little contact cleaner or wd-40 in them and work them back and forth. If it's the switch, that should fix it for a bit, until you can replace the switch.


I've also had the ddec lock out the jake. When that happened, It wouldn't work at all in any setting. The transmission would not downshift. It would reset when I shutdown and restarted the coach.

A mechanic found a jake wire with bare insulation under the valve cover. When it would short, the ddec would record an error and shut down the jake until reset. I haven't had that happen again since we fixed it.
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Old 05-25-2018
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Default Engine brake

With the mode off the cruise control would start to surge at the slightest incline. Turning the mode on totally cured this and made the cruise control work. If I forget to change the mode and run cruise on the first hill even an overpass on the freeway is enough to start the surging. I will try a run and see if it affects to jake brake.
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1995 WB 42
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Old 05-25-2018
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surging or down shifting? hunting gears?
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2000 LXI 43
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Old 05-25-2018
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Default Engine brake

The throttle would be surging, it never tried to shift.
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1995 WB 42
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