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Old 08-08-2019, 09:25 PM   #1
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1993 Spartan Chassis Beaver Transmission Interface

1993 Beaver Motorhome VIN 4S7NT9K03PC008213
Transmission Per Nameplate photo -
World Transmission by Allison transmission
Serial 6510004676 9508473 92K.10
Model NO. MD3060 NO. 29508478

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VIM or Vehicle Interface Module or Relay Control Module or Transmission Control Module
P/N 29509886 12 volt 6 relay Ser# J001261

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2 digit green display: Touch Panel WTECII


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VIM 29509886



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ECU + Cal ASSY 29511212 CIN: 0700152001G

ECU probably means Electronic Control Unit.
Probably WTECII version of hardware. (Above pictures are from our failing motor home)

Problems -
About half the time after startup the select shows only one “N” on the right. The left “Select” display is blank. The “Do Not Shift” light lights. Occasionally after idling for 20 seconds or so with only one “N” showing, the transmission will goes in gear and “4” shows on right display. On one instance on level ground I moved the motor home forward 100 feet in this mode to get out of the way. It moved like it was in first gear but I did not use any accelerator to really verify. If both the left and right “N” are showing after the engine is started, the transmission works fine while driving and only fails again when the engine is restarted. After traveling for an hour and turning the engine off for a rest stop then restarting the engine the Red Transmission Hot light often lights and the alarm sounds for 5 minutes of driving. Often the light and alarm quit after a few miles. The transmission temperature gauge reads about 1/3 of full scale about 180 degrees. Often I need to restart the engine two or three times to get both ‘N’s”. It is like the ECM does not boot up correctly.
The fault code shows d1, 22, 16 which is the output speed sensor, I think.
Occasionally the right N remains lit on the gear selection pushbutton assembly after the ignition is off. Once it remained lit for 46 seconds. It does cycle off.
Also saw fault d2 13, 12 which is ECU input low. Battery read 11.87v so this was probably too low at the time.

Troubleshooting -
I replaced the transmission output speed sensor, removing p/n 29509637 and replaced with current p/n 29543432. This did not help on the next outing. The transmission sits forward of the engine and the differential sit forward of the transmission so I presume the output sensor is the most forward sensor on the transmission. Both the old and new sensor measured very close to 300 ohms.
Then on June 20, 2019 the transmission had Faults -
D1, 24 23 Sump fluid temperature hot
D2, 13 13 ECU input voltage medium low
D3, 22 16 Output Speed Sensor
D4 13 12 ECU input voltage low
D5 22 14 Engine Speed Sensor
Jun 28, 2019 never saw both the right and left ‘N’ on touchpad, only the right. Twice the tranny went in gear showing blank on the left touchpad window and 4 in the right window. (Started engine maybe 4 times.) (‘N’ should appear on both the left and right displays.)

Work around -
Hold the mode switch for 10 second until the beep which resets the controllers faults and then a restart is almost reliable.

Repair -
Sent ECU - WTEC II to Transmission Instruments for repair. They returned after repairing the power supply and refreshing the EE Prom Memory. Warranty of 2 years. (Assy 29511212; CIN 0700152001G)

August 6, 2019 - Installed repaired ECU and reliably got two ‘N’ as it should. Shifted into Drive and Reverse and Neutral without an error. August 7 drove motor home to Little Boston and the tranny and shift mechanism worked as designed. I do suspect all is good now. Thankyou Transmission Instrument. Cost $550

Lack of documentation was the hardest part of this effort. It took forever to locate the ECU.
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Old 08-08-2019, 11:25 PM   #2
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Glad to here you got it fixed.
I had similar issue with our ‘98 Overland. WTECIII selector and ECU. All located under dash.
Ours failed in driveway at son’s house, 2000 miles from home. Cat eye on selector, no start. Intermittent start and shift, but then quit again.
After wire tracing, ECU tested, VIM checked, and discussion with Transmission instruments, came down to bad power/ground wires from batteries.
Cut wires and ran new ones- problem solved.
BTW, Allison states only 9.6 volts required for operation.
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Old 08-09-2019, 08:45 AM   #3
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Interesting

It does feel better to have all working, reliably. Problems are not always exactly the same are they?
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Old 08-09-2019, 02:03 PM   #4
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Here’s a link to my thread on my tranny issues and repairs.

MD3060 buzz and “do not shift”
https://www.irv2.com/forums/showthread.php?t=450254
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Old 08-10-2019, 01:13 PM   #5
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Interesting

Your problem was a hard one. Glad you got it fixed. Transmission Instruments are sure helpful in our repairs.
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