MCI-9 Transmission won't engage

NJT5047 · January 13, 2008, 09:13:04 AM

They have a website too. http://gendieselect.com/
Located in Hibbing.
JR

Kwajdiver · January 13, 2008, 03:49:27 PM

Went through the Code 22 (Speed Sensor) Trouble shooting and once again through Code 21 (TPS) Trouble shooting guide. Found no problems with either. Tried resetting the ECU, with the 5 cycle approach. Did it by switch the dash switch on and off, and the main power on and off. Both with the code switch in the on positions, switching between R & N.

Dallas and I went through Code 21 trouble shooting chart, thought maybe we had a bad TPS. I've replace that, and I have gone through the Code 21 trouble shooting chart again. At this point, I do not believe it is Code 21 TPS that is a problem. However, as stated, the ECU will not clear the fault. Starting to believe the loaner ECU may have a code 21 hangup.

Plan to call Randy, and Baker Transit Parts, plus a couple others, to pick their brains.

Any thoughts,

Bill

Kwajdiver · January 13, 2008, 04:04:44 PM

NJT5573,

Which ATEC book do you have? Sammy and I have been working from his 1991 for the Splash-Proof connectors. This seems to be the closest to my set up.

Thanks,

Bill

niles500 · January 13, 2008, 04:43:16 PM

NJT 5573 · January 13, 2008, 05:39:57 PM

Bill, I have the Splashproof Standard ATEC automatic Model V731 munual, Copywright 1987.

Randy gave it to me and told me there was very little difference between the V731 and my HTB748R.

NJT5047 · January 13, 2008, 06:09:33 PM

Bill, do you know what the loaner ATEC ECM you're using came out of? Was it a DDEC engine?
If so, the ECM may be looking for com data from the DDEC unit.
The DDEC ECM feeds the TPS signal thru the link. Non DDEC TPS units are wired thru a different set of leads.
You've got an unusual animal with the 'stand-alone' ATEC.
The "loaner" ATEC ECM may not be correct for your application (MUI). It would seem reasonable that the ECM for DDEC and MUI may be programmed diferently.
Have you tried your ATEC ECM since it was removed?
You may have to reinforce the fact that you have an MUI engine when discussing your problem with professionals.
JR

Kwajdiver · January 13, 2008, 06:24:38 PM

JR,

If I change the PROM from my ECU to the loaner, would it matter what it came out of? When I change ECU, I change PROM. However, with either ECU or either PROM, the transmission acts the same. Will not shift, except in "1".

With my ECU the code light remains RED..... The loaner ECU flashes a code 21. Of course we are starting to believe that's not correct either.

Really need a bus that I could plug my ECU into, see if it's bad or not.

Bill

NJT 5573 · January 13, 2008, 06:41:14 PM

Bill, why not send it to Randy? I bet its cheap to have it tested.

Kwajdiver · January 13, 2008, 07:02:03 PM

I'll call him first thing in the morning. If he can test it, I will overnight it to him.

Bill

NJT5047 · January 13, 2008, 07:16:53 PM

Assuming the EPROM is ok, I suppose that should set the programming to your specs.
I believe Larry's got the right idea. Let someone rule out the ECM...if that's possible. Red lable UPS for fast service.
I was looking at Niles' "TPubs" thing, but that all relates to DDEC II and up. Not sure if there's any difference (electronically speaking) in any of the HT700 (or V731) ATEC series.
Looking through the 'net found a company with an elaborate Allison website...Valley Diesel Power or some such. Google Allison and they'll come up. They offer Allison training schools. Most of there offerings are related to WTEC. Still, they probably have HT familiar employees too.
Don't know about your financial situation, but maybe you could fly Randy down to your bus?
I still cannot imagine that the broken dipstick is causing a problem. If it was, you'd get a code on the circuit failure. There's a temp sensor in the transmission that won't let it shift until the temp is above 20*. Something in that circuit could (big "IF" could) cause non-shift if the wiring failed. The temp sensor shares ground with TPS. Unsure what a temp sensor failure would code too. Don't have a dx manual. I will have soon.
Pull the air cleaner, remove the dipstick housing, and use a extension magnet to fish out the broken dipstick. You may get it out that way. Dropping the pan and losing a lot of ATF is the only other way to get it out.
Good luck, JR

Kwajdiver · January 13, 2008, 07:30:09 PM

JR,

The Temperature Sensor is code 33. Sammy just e-mailed me the trouble shooting guide for that. What we are doing is eliminating all the codes that will stop the tranny. There are about 12 of them.

Item Status
Extremely low oil level Done

Oil Temp too low

Voltage to ECU too low Checked and rechecked

Throttle Sensor (code 21) Check, checked and replaced

Range Selector We feel this is working

Disconnected or dirty Connectors All have been checked and cleaned

Faulty wiring harnesses Could be,,, but we have checked and checked this

Speed sensor Checked

Faulty H Solenoid

Faulty F,D or J Solenoid

Hydraulic problems

Faulty ECU

As you can see, Sammy and I are attacking them one at a time.

Bill

Kwajdiver · January 14, 2008, 09:58:15 AM

Spoke with Randy, my ECU is being overnighted to him.

Bill

NJT5047 · January 14, 2008, 04:35:02 PM

The outcome of Randy's evaluation is going to be interesting.
Did Randy offer any suggestions?
JR

compedgemarine · January 14, 2008, 04:46:56 PM

WOW. sorry for all your troubles but sure makes me glad I have an old DD before all the electronics. If mine doesnt work it is usually me.

Kwajdiver · January 14, 2008, 05:08:53 PM

JR,

Not really,,, he was pointing a little towards the three switches (R,N,D) in the tranny

But wanted to look at the ECU. Which by the way is $150.00.

Then a "little"

more, if there is a problem. Hope to have it back by Friday. (I can wish anyway)

Meanwhile, Sammy is spending hours scanning and e-mailing me most of the manual. Thanks Sammy, your my hero.

Now who was it that had a manual they didn't mind loaning me. If it is still available, I will take you up on the offer.

Bill