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Author Topic: MCI-9 Transmission won't engage  (Read 33211 times)
Kwajdiver
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« Reply #45 on: November 20, 2007, 06:05:39 AM »

Sammy,

Going to work,,, will have to "play" with bus later.

Spoke to JR, he thought hot wiring 12v in would do the trick. 

Will clean all connectors and battery terminal before trying hot wire trick.

Thanks for the help,

Bill
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Auburndale, Florida
MCI-9
V-6-92 Detroit, Allison 5 spd auto
Kwajalein Atoll, RMI
Kwajdiver
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« Reply #46 on: November 20, 2007, 12:02:46 PM »

Sammy,

Cleaned the battery connection, although they were not bad.

On the Converter;
Pin 5 a Green wire has 4vdc.
Pin 6 a Purple wire has 15vdc.  This purple wire has been worked on.  A new (purple) wire has been run to the push button switches.

I'm a little worried about jumping 12 volts to Pin 8.  It is a black wire and ohms to ground.
"L" does not ohm out to converter pin 6, a red wire.

What do you think?

Bill
Not going anywhere in Gulfport, Ms  Sad
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Auburndale, Florida
MCI-9
V-6-92 Detroit, Allison 5 spd auto
Kwajalein Atoll, RMI
Kwajdiver
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« Reply #47 on: November 20, 2007, 12:36:04 PM »

Sammy,

Do you have a phone number that is okay to call?

Bill
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Auburndale, Florida
MCI-9
V-6-92 Detroit, Allison 5 spd auto
Kwajalein Atoll, RMI
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« Reply #48 on: November 20, 2007, 12:44:42 PM »

When the connector is connected to the ECU I have 12 volts on Pin L.  Looks like that is an output to something.
Pin 8 is still to ground.

Bill
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Auburndale, Florida
MCI-9
V-6-92 Detroit, Allison 5 spd auto
Kwajalein Atoll, RMI
Sammy
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« Reply #49 on: November 20, 2007, 12:54:29 PM »

Bill , Do Not jump Anything.
Still checking the Allison diagrams.

I have 2 diagrams I'm checking - one from 1983 one from 1991 and I have more.
We need a schematic of your bus,to see how the Allison wiring interfaces with the bus wiring.
I am using the 1983 Allison diagram and looking at the 1991 for comparison.
1983 does not show an interface, direct wiring fron converter to ECU.
1991 shows an interface between the two.

Pin 5 of the converter goes to Term 8 of the J2 connector - it's a ground on the 1991 breakout and it just says "battery" on the 1983 one. All newer schematics I have show it as a ground wire too. It checks out as a ground wire so we'll treat it as a ground wire.

Pin 6 of converter goes to Term L of the J2 connector and the shifter in the 1983 diagram - it's a power wire on both diagrams, checks out as a power wire - sounds fine.

Pin 7 of converter goes to term 2 of J2 connector - it's 12 volt power on both diagrams, tests as power, we'll treat it as power.

Pin 4 of converter goes to term 3 of J2 connector, shows as 12v memory wire on both diagrams, tests as 12v wire, sounds good.

Pin 1 of converter is battery ground.

Pin 2 of converter shows as 24 volts into converter.

The 5 terminal strip you mentioned earlier will be on the MCI schematic

That's the best I can do for you so far......still checking..on my day off.....lol..... Smiley

Pin 3 of converter shows as 24 volts into converter.
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Sammy
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« Reply #50 on: November 20, 2007, 12:55:56 PM »

Bill, I sent you an e-mail with my phone number........... Cool
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Kwajdiver
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« Reply #51 on: November 20, 2007, 01:54:38 PM »

Sammy,

J2-Pin 2, drops from 26v to 14 v when plugged in.

Guess this means we have all voltages present. 

Will pull ECU and take it to Mobile in the morning to have it checked.

Thanks,

Bill
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Auburndale, Florida
MCI-9
V-6-92 Detroit, Allison 5 spd auto
Kwajalein Atoll, RMI
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« Reply #52 on: November 20, 2007, 02:04:46 PM »

Bill, happy to help out.
It's a pleasure to work with you.
Please keep us posted.
Regards,
Sammy  Cool
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NJT5047
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« Reply #53 on: November 20, 2007, 05:40:31 PM »

Is it possible that the converter/ATEC interface includes such things as park brake, and fast idle.
The fast idle could cause a shift problem. 
If any of these items were not functioning correctly, could the end result be a non-shifting trans.  Does the fast idle relay still switch when the fast idle switch is 'on'?  If the relay is full-time 'on' or welded, the trans may not shift?? Sammy?   
When did the fast idle system quit?? 
Another question, do you have a code light and switch in the bay near the ATEC ECM? Does it light up at all when the switch is moved?
I know Bill is not working with a DDEC unit, but my trans "do not shift light" does not illuminate under normal conditions...but it won't shift if the above items are not in the correct position.  With exception of the high idle....which it knocks off automatically.  And the above conditions don't set ATEC trouble codes. 
Could the park brake switch be in the 'on' position?  Fast idle relay issues? 
What I advised Bill to try is to work around the 12V B+ supply.  This is only if the 12V ATEC B+ inputs can be identified postively.    That would give him a baseline for whether his problem is upstream or downstream of the converter and related safety devices. 
A schematic would be really useful to see how the B+ is supplied to the ATEC system.  And is the 12V ignition "on" supplying 12V to the ATEC unit when the master ig switch is in 'run' position?  The 'key switch' power question has likely been ruled out already....?
Reckon we'll have to wait to get more information.  Believe Bill is now on holiday!  Cool
JR



   
   
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JR Lynch , Charlotte, NC
87 MC9, 6V92TA DDEC, HT748R ATEC

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Kwajdiver
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« Reply #54 on: November 20, 2007, 08:27:23 PM »

JR,

Bill is not on Holiday Day till tomorrow afternoon.  Then it's off to Tampa, via Jet Plane.

Trying to remember if I used the fast idle switch last time I move the bus.  Just don't remember.

Looking at the Motor Control Wiring schmatic, I see the Fast Idle Switch tied to the Neutral Relay.  Do not see a Fast Idle Relay, are they one in the same?   Off the Neutral Relay pin 2 is a Neutral Switch at the tranny that is N.O.  Even if this was a problem, I don't see it tried to controlling the tranny.   However, it may kill my fast idle.

Going the hour drive to Mobile in the morning early to get a reading on the ECU.  Will post as soon as I know something on it.

Bill
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Auburndale, Florida
MCI-9
V-6-92 Detroit, Allison 5 spd auto
Kwajalein Atoll, RMI
Sammy
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« Reply #55 on: November 21, 2007, 05:25:56 AM »

JR,you bring up an excellent point.
Not sure of parameters ATEC is looking for to allow a shift from "N" to "D".
It could be seeing an input for fast idle and inhibiting the shift - I don't know for sure.
Without the schematic for his bus I cannot give a definite answer.I would need to see the fast idle circuit.
Without a ProLink, I cannot check the I/O's of the ECU (input and outputs),to look at what the ECU "sees".
Maybe there are some folks with a similar application that can try to simulate these conditions for all of us and post their results. The "check trans" tell tale light and the "do not shift ' light could be burnt out on his bus, leading us to some kind of shift inhibit problem in ATEC.
Bill's bus,according to the 1983 diagram has no interface - only a voltage converter.
The 1991 bus shows an interface between ATEC and the voltage converter.
I have sent Bill some info and we spoke on the phone already too, comparing notes.
We both feel we have eliminated the basics - power,ground,switched power to ATEC at this time.
Now we wait to hear about the ECU bench test results.
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Kwajdiver
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« Reply #56 on: November 21, 2007, 07:56:21 AM »

Guys,

Al-Trans is Mobile was unable to bench test the ECU.   They where able to put me in contact with someone in New Orleans that may be able to help a little more.  Meanwhile, the guy in Mobile wants me to check the voltages on the shift selector plug.  Will do that, when I get back to the bus.

Meanwhile, I have a radar problem to take care of at work.

Bill
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Auburndale, Florida
MCI-9
V-6-92 Detroit, Allison 5 spd auto
Kwajalein Atoll, RMI
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« Reply #57 on: November 21, 2007, 08:03:19 AM »

Hey Bill,

Can't help with your problem just wanted to say Happy Thanksgiving and hope you are able to get it fixed soon.

Paul
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Kwajdiver
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« Reply #58 on: November 21, 2007, 08:06:21 AM »

Thanks Paul,   I  feel we are getting closer to the fix and with the help of Sammy and JR, I'm leaning ALOT more about this bus.

Happy Thanksgiving to everyone,

Bill
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Auburndale, Florida
MCI-9
V-6-92 Detroit, Allison 5 spd auto
Kwajalein Atoll, RMI
Kwajdiver
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« Reply #59 on: November 21, 2007, 10:06:52 AM »

Shift Pad Needed....  Before I can go any further, I need to confirm, or not, that my Allison Shift Pad is working.  If may not be.  I seem to have voltages to the connector, but no lights are working.

So, I need to buy or borrow a shift pad.

Going to put this out on a new thread.

Thanks,

Bill
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Auburndale, Florida
MCI-9
V-6-92 Detroit, Allison 5 spd auto
Kwajalein Atoll, RMI
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