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Old 01-21-2013, 03:43 PM   #15
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My manual shows 23 as shift selectors but no reference to 45 as a sub code. Guess I have to find an Allison mechanic. I have the push button shift selector but no clue on what could be wrong, especially when the sub code is not listed.
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Old 01-21-2013, 04:05 PM   #16
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Google doesnt come up with it either.. But, this is all I got:

23
12, 13, 14, 15, 16

Check:
a. ECU connectors are tight, clean, and undamaged.
b. Shift selector connector is tight, clean, and
undamaged.
c. Wiring harness has no opens, shorts between
wires, or shorts to ground.
d. Shift selector(s) for proper operation.


The last time this happen in a vehicle, it said 'Solenoid Circuit A - Bad' and I replaced the solenoid pack only to have the same problem. Turned out to be a broken wire in the harness (rubbed on the frame). My suggestion would be to look and check for any obvious breaks and remove/clean/refit and and all connectors to the tranny and shift selectors.
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Old 01-21-2013, 04:08 PM   #17
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Same as mine. Got an appointment with mechanic for Wed.
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Old 01-21-2013, 04:30 PM   #18
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I don't have my manual with me (the MH is 1200 miles away in storage), but your problem may be the first read out. I think it shows that your fluid level is low. (OL -7). Check your manual for info on that, as well as a dipstick reading if you have one. The sixth gear lock out maybe a tranny saving logic when the fluid level is too far out of range.

Also, look under the rear of the rig to see if there is any sign of leakage at the trans or cooler lines.

Good luck.
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Old 01-21-2013, 04:41 PM   #19
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My manual also shows oL 70 to be "sump fluid temp to be too low " nor do I know where the trans dip stick is on a C-9 side radiator. But I sure appreciate everyone's help is trying to diagnose the proplem.
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Old 01-21-2013, 07:46 PM   #20
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Chucklesg,
Sorry for the delay in getting back to you. Based on the code you reported (d,1, 2,3,4,5) the issue is with a speed sensor. Or very low fluid level. It may be a speed sensor connection. To clear the code press and hold the mode button for 10 seconds. Cycle the ignition, then drive the coach again. If the problem persists the code will reset.
Before you do the above check the trans fluid level. My guess at this point is you have very low fluid or at least low fluid is being reported to the TCU. Hope this helps you.
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Old 01-21-2013, 07:49 PM   #21
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Quote:
Originally Posted by chucklesg View Post
My manual also shows oL 70 to be "sump fluid temp to be too low " nor do I know where the trans dip stick is on a C-9 side radiator. But I sure appreciate everyone's help is trying to diagnose the proplem.
I don't know where your trans fluid stick is either but it should be grouped near the engine oil dipstick. If that logic fails crawl under the coach and follow the stick tube from the trans housing to wherever you can pull to check level.
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Old 01-21-2013, 08:13 PM   #22
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Kix, thanks again. Apparently you can't get an accurate measure of the trans fluid unless it is warm. I will let it run tomorrow, find the trans dip stick and at least get an idea of the level. It did run ok yesterday and the trans temp did not seem to get too hot in a 45 minute drive. I have an appointment Wed with an Allison knowledgeable mechanic to hopefully figure it all out.
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Old 01-21-2013, 08:31 PM   #23
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Kix, thanks again. Apparently you can't get an accurate measure of the trans fluid unless it is warm. I will let it run tomorrow, find the trans dip stick and at least get an idea of the level. It did run ok yesterday and the trans temp did not seem to get too hot in a 45 minute drive. I have an appointment Wed with an Allison knowledgeable mechanic to hopefully figure it all out.
I understand that to be correct too, but it will be close when cold but get it warm to add to proper level. In fact I've heard that the shift pad method of determining fluid level is the most accurate.

When you get to the solution please post what you find.
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Old 01-22-2013, 12:10 AM   #24
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Quote:
Originally Posted by bluepill View Post
I don't have my manual with me (the MH is 1200 miles away in storage), but your problem may be the first read out. I think it shows that your fluid level is low. (OL -7). Check your manual for info on that, as well as a dipstick reading if you have one. The sixth gear lock out maybe a tranny saving logic when the fluid level is too far out of range.

Also, look under the rear of the rig to see if there is any sign of leakage at the trans or cooler lines.

Good luck.
Quote:
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Chucklesg,
Sorry for the delay in getting back to you. Based on the code you reported (d,1, 2,3,4,5) the issue is with a speed sensor. Or very low fluid level. It may be a speed sensor connection. To clear the code press and hold the mode button for 10 seconds. Cycle the ignition, then drive the coach again. If the problem persists the code will reset.
Before you do the above check the trans fluid level. My guess at this point is you have very low fluid or at least low fluid is being reported to the TCU. Hope this helps you.
oL70 is because he didnt drive for 50 miles (joking) before reading the codes.. ie: too cold of fluid temp for accurate level readings. I know several trannies that need to be checked in very narrow range of temps to be accurate.
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Old 01-22-2013, 08:12 AM   #25
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oL70 is because he didnt drive for 50 miles (joking) before reading the codes.. ie: too cold of fluid temp for accurate level readings. I know several trannies that need to be checked in very narrow range of temps to be accurate.
That may well be the case of the OL70 code, however low fluid can cause the symptom he is having
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Old 01-22-2013, 08:27 AM   #26
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That may well be the case of the OL70 code, however low fluid can cause the symptom he is having
True.. but then you'd think you'd have other symptoms like hard shifting... dont know if his system actually tells him how low or not either...
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Old 01-22-2013, 08:47 AM   #27
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No, low fluid symptom is not usually hard shifting but I suppose it could be. I don't know about shift pad reading fluid level either. Mine does but his may not. But, in any case, not shifting between 5 and 6 can be caused by low fluid or speed sensor signal related issues or maybe even just electronic connector resistance.
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Old 01-22-2013, 09:04 AM   #28
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The Allison 3000MH needs to be 140F or higher in temp and the coach needs to be level before checking the oil level. If driven to heat the oil up which is the best method, it needs to sit level for about 2 minutes before taking a reading. If the parameters are not correct, the display will countdown until the parameters are met.

I thought the diagnostics would not report oil level beyond + or - 4 quarts but I may be wrong on that point.

BTW, my Allison shift point for going from 5th to 6th gear is about 60-61 mph. That's why my cruise set point is 62 mph.

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