Allison Transmission Questions


J

jljeeper@msn.com

New Member
RE: Allison Transmission Questions

Well the Ford cruise trouble shooting manual says an AC signal of at least 1.5 v, someone else also told me that some circuits don't care if the signal is AC or pulsating DC. they care only about frequency at a level they can read. Either way AC or DC it seems that I don't have a high enough voltage for the cruise. I'm pretty sure I did check the DC level. Well that pulsating DC would have to be measured with the duty cycle in mind, when using a volt meter (I think). Some of this is beyond my grasp. I did talk to a friend in CA that had a CC with an Allison and his cruise quit working but the speedo and trans still worked fine and it turned out to be the transducer on the transmission was bad. I just got off the phone with my step dad and he claime that he can easily build an op-amp circuit that will convert my signal to any voltage I want.

Someone sent me a circuit diagram of the ECU speed output to the speedo. It shows dip switches for two different output levels. Low (0 to .5v) and High (-2 to 12v) I think the .5v on the low may be a missprint maybe it's (0 to 5v) 50% duty cycle should read 2.5vac on a volt meter, I was told. It's not what I am getting. I get less than a volt. Thanks for the TAC number, That will be helpful before deciding what I need to do.

Thanks

Jon
 
B

Bush70

New Member
Re: Allison Transmission Questions

I believe you said it was a 94 correct? If so it probably is a mechanical engine. The cruise control could be an add on. It does come from the factory but had to be added due to the engine. Not like the new ones. If so it probably is made by King Controls. They have trouble shooting guides on there web site.
Hope this helps.
Good Luck
 
DL Rupper

DL Rupper

Senior Member
Re: Allison Transmission Questions

Do 29 pages of questions/problems with Allison Transmissions indicate some inherent/design problem with Allison transmissions. Is the Duramax/Allison 6spd tranny a good way to go.
 
J

jljeeper@msn.com

New Member
Re: Allison Transmission Questions

Bush70 - 9/17/2006 3:51 AM

I believe you said it was a 94 correct? If so it probably is a mechanical engine. The cruise control could be an add on. It does come from the factory but had to be added due to the engine. Not like the new ones. If so it probably is made by King Controls. They have trouble shooting guides on there web site.
Hope this helps.
Good Luck
Click to expand...

It says ford on the cruise control box (Called an Amplifier) The troubleshooting guide I got from Freightliner says Ford. I went to the local wrecking yard and pulled an exact matching control box off a Ford P/U (for testing) I do have the troubleshooting guide. Everything checks out as good except the speed signal comming in. I purchased a speed transducer for a 1990 Ford P/U and attached it to a drill motor then fed the signal to my cruise control speed circuit (VSS), It's fully functional with a correct speed signal. As I varied the drill speed I could watch the throttle move accordingly. I have to assume that the cruise did work at one time. So I suspect it's the speed signal I'm getting from my ECU or transmission. According to my cruise manual I shoud get at least 1.5VAC I'm only getting less than one volt. Although the speedo works and the trans shifts fine.

I'm guessing maybe the ECU and speedo is ok with a lower signal but the cruise doesn't like it. At this point I would like to verify the speed signal from the transmissions transducer to see if it is in the correct range.
 
D

dbarton291

Senior Member
RE: Allison Transmission Questions

Once the ECU comes back from DMR, if that doesn't fix the cruise issue, maybe putting an output speed sensor in the trans might work. I once worked on a speedometer issue for a guy, and that one turned out to be the terminals at the interface. Someone had probed them and distorted one of the female terminals so it wasn't making a good, tight connection. You had to look really close to see it. We tried everything, we thought. Once we replaced that terminal, the speedo worked fine. Just another suggestion for future reference. Let us know what the fix is. This has got me extremely curious.
 
D

dbarton291

Senior Member
RE: Allison Transmission Questions

I thought of something else. I also worked on a vehicle one time for a similar speed signal issue. The output speed sensor had two o-rings on it. It should have only one o-ring in the groove of the sensor. This one had one that had been put on the sensor near the area where it seats in the transmission. This set the sensor too far away from the speed sensor gear in the trans, resulting in a weak signal. Just another random thought.........a free one at that. Again, good luck and let us know how it goes.
 
J

jr64

New Member
RE: Allison Transmission Questions

cplatt41,

I just bought a 1996 Fleetwood Discovery with 5.9 and Allison 6 speed. On first start it will always go in to gear properly but after I drive 20 miles or so when I get where I am going when I try to make a couple of shifts I get a constant tone from the selector and the light flashes "6" when in forward and "R" when in reverse and it will not go in gear. I shut the coach off and wait 20 min and it will work again. This happens every time. Have you found your problem?

jr64
 
D

dbarton291

Senior Member
RE: Allison Transmission Questions

It is likely there is some kind of an inhibit active. Engine RPM too high, throttle signal high, brake pressure switch not on, etc.
 
D

demagAC205

New Member
Re: Allison Transmission Questions

Hello everybody, maybe you can help us.
We heave an autocrane whith allison HD4060p. On display is light error codes D1 25 11 whith OL--95. After that, crane go just on 1st gear.This mean oil level sensor is failure, and output speed sensor 1st failure.we are cheked all leads to output speed sensor, but error not gone. Later we changed the output sensor but problem was not gone. In our country (Lithuania) is not the dealers of Allison transmission. And we don't know what to do more! That we must do to fix it.
thank you and Happy new year!
 
D

demagAC205

New Member
Re: Allison Transmission Questions

OK. But when we have cheked the procedures main code 22 subcoded 14, 15, 16 1. Check:
a. Speed sensor connectors are tight, clean and undamaged.
b. Speed sensor mounting bolts are properly torqued (24-29 N.m (18-21 lb ft))
c. Wiring harness to sensors has no opens, shorts between wires, or shorts to ground.

and: main code 25 subcode 00, 11, 22, 33, 44, 55, 66, 77 1. Check:
a. Speed sensor connector is tight, clean and undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Fluid level is correct.
d. Sensor mounting bolt torque is correct (24-29 N.m (18-21 lb ft)).
e. Wiring harness to sensor has no opens, shorts between wires, or shorts to ground.

Anyway when we startig to drive and 1st range must up to 2st range is'nt heapens. In that time illuminating CHEK TRANS and apairings codes OL--95 and D1 22 16 D2 25 11. Whay OL--95 error code everyvhere writed:Report sensor failure display to a distributor or dealer in your area.we know this sensor is inside gear box near the control module. Do we have change this sensor or is another way to repair it? thanks
 
D

dbarton291

Senior Member
Re: Allison Transmission Questions

I am assuming this vehicle had been in service and running correctly for some time, so this is not a mismatch of components issue.
Your original question was about code 25-11 and OL-95. This means output speed sensor was detected at zero speed in first range, and the oil level sensor is failed. These two codes together may indicate a problem in the chassis wiring harness because they both can be caused by open circuits. This is most likely an open, or intermittent open.
I cannot tell you where in this vehicle to look via the internet. Here is the contact information for the Allison Transmission service office in Sliedrecht. Perhaps they can help you or refer you to a service outlet that can. I know a lot of service issues are solved also by the distributor DGS in Mainz, Germany.

Allison Transmission Europe B.V.
Baanhoek 188
3361 GN Sliedrecht
The Netherlands

P.O. Box 1225
3360 BE Sliedrecht
The Netherlands
Phone: +31-78-6422-100 or +31-78-6422 + ext
Service/Training: +31-78-6159-950

Here is DGS' contact information
DGS
Wernher-von-Braunstrasse 11
PO Box 421355
Mainz 42 (Hechtsheim)
55129 Germany
Tel: +49 6131 58070

Keep in mind this is most likely a vehicle wiring issue and not a problem with the transmission (so it's not covered under the transmission's warranty). Have you tried working with the vehicle manufacturer? I assume this is a Demag crane by your user ID. Demag is normally interested in satisfied customers, also.

Out of respect for our hosts here, this is an RV forum. Let's not crowd this with commercial vehicle issues please. Please contact Allison Europe or DGS for assistance. They are more able to help.
 
R

rodney

New Member
Re: Allison Transmission Questions

Hello everybody,

I have a 94 monaco executive with a MD3060. It has a VDO transmission oil temperature guage in the dash. What range of temperatures should I expect to see under normal operations?


Thanks
 
D

dbarton291

Senior Member
Re: Allison Transmission Questions

To be precise, you have to know which temperature the gauge is monitoring...to the cooler, from the cooler, or sump. Allison has always recommended the dash gauge go in the to cooler line because that's where the hottest oil is. Not everybody paid attention. For to cooler temperatures, 300 deg F is overheating. Normal temperature seldom gets above 250 deg F. Anything below 250 is good. 250 - 300 is okay, but not ideal.
 
L

lensilva

New Member
Re: Allison Transmission Questions

dbarton,

You answered my question in another post. TMALSS, my 94 Vogue ECU had been replaced with a 2004 unit and never calibrated (probably by an RV shop). Ocala DDA is going to recalibrate it for me.
On to my questions;
The Vogue has a Pacbrake but it never was connected to the trans. I am going to have that function enabled and wire it myself. From earlier posts on this thread, it looks like I should have it set to select fourth rather than second as recommended by Allison. Do you agree?

A curiosity; The Allison TS manual TS2470EN, Fig P-9 indicates that wire 132 (engine brake enable) would be a 0v when when wire 119 (preselect request) in at 12v and the trans is in lockup. However, Fig P-36 shows wire 132 hot in lockup. Does the signal on wire 119 change the wire 132 signal?

I am also considering wiring the stoplight circuit through a diode to E2 on the VIM to enable the Pacbrake regardless of the dash switch position. Comments?

Thanks very much,

Len Silva
 
D

dbarton291

Senior Member
Re: Allison Transmission Questions

The preselect for fourth during engine brake enable is intended for jacobs type compression brakes. Preselect to second is intended for exhaust brakes like the pac brake. Some owners of pac brakes think the preselect shift quality down to 2 is objectionable. Depends on the vehicle and owner. I'm neutral on that issue.

As for your second question, the diagram on P-9 looks backward to me. It shows the request line 119 open, but the relay is closed and labeled de-energized, enabling power to the engine brake relay. As I see it, the relay denergized should be open. Power to the request line via the dash switch should tell the ECU whether or not to ground or power(depending on the cal settings), 132, energizing the relay and allow power to reach the throttle switch.

I may very well be missing something here, so do your own troubleshooting and make your own judgments. My response here is worth what you paid for it. Good luck.

I've never been a fan of any auxiliary braking device coming on without a dash switch because they only affect the rear wheels. I like giving the operator the option of turning off an auxiliary braking device when the vehicle is on slick roads. I like the idea though of brake lights coming on when the auxiliary braking device is on.
 
P

peety1

New Member
Re: Allison Transmission Questions

I have a 3000(06)/cat350 with 35,000 miles....for the past 15,000 on occasion it slips and races 4-500 rpms between 3rd and 4th...Allison has reset the computer for adaptive learning 5 times....it shifts fine for several hundred miles then it slips, then it goes back to normal shift...Allison replaced brain last week...did fine for 400 miles, now its slipping again probably 10-15 times during 500 mile trip...Has transynd from plant....fluid level is correct when hot by sensor and dipstick(slight foaming at very top)...any suggestions...with a very cold ambient (20degrees) temp, it hard shifts from neutral to drive on the first shift...after that its ok...Idle is at 700 during hard shift...don't know if these are related but I'm *** tired of returning to Allison just to have the same problem re-appear.

Thanks....
:(

Update...I'm in Ocala and it is now slipping from 3rd to 4th every time unless I baby the shift....
 
Grandview Trailer Sa

Grandview Trailer Sa

Senior Member
Re: Allison Transmission Questions

If you are under warranty, keep going to Allison. You may void warranty if you do something else. Hopefully they will figure it out soon. Tell them your frustrations.
 
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