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OEM TROUBLESHOOTING GUIDE
FOR ALLISON WT TROUBLE CODES
A. DISPLAYING OIL LEVEL INFORMATION
If the transmission you are troubleshooting has an oil level sensor, oil level
information can be displayed on the shift selector. If the transmission does not have an
oil level sensor, go to Section B.
Use the following procedure to display oil level sensor information:
1. Enter the oil level display mode:
Using a push-button shift selector, simultaneously press the (up) and ¯ (down) arrow buttons.
Using a lever shift selector, press the DISPLAY MODE button.
a. A two minute countdown begins after the following conditions are met:
- Engine is at idle.
- Sump oil is at operating temperature.
- Transmission output shaft is stopped.
- Transmission is in neutral.
- Oil level sensor is functioning properly.
NOTE: Failure to meet any of the above conditions stops the two minute
countdown. The shift selector displays one of the following codes to show the reason for
the countdown interruption. Once all conditions have been met, the countdown resumes where
it stopped.
CODE |
MEANING OF CODE
|
| OL, --,50 |
Engine rpm too low |
| OL,--,59 |
Engine rpm too high |
| OL,--,65 |
Neutral not selected |
| OL,--,70 |
Sump oil temperature too low |
| OL,--,79 |
Sump oil temperature too high |
| OL,--,89 |
Output shaft rotation |
| OL,--,95 |
Oil level sensor failure |
NOTE: Report sensor failure to Western States Converters and Transmissions. Call
1-888-463-3499 Monday through Friday from 7 am to 5:30 pm P.S.T.
NOTE: The shift selector display can only display two characters at a time. One
character is displayed under the MONITOR label and one under the SELECT label.
b. The display flashes and an 8, 7,.....1 count occurs during the two minute countdown.
Oil level information displays after the countdown.
2. After two minutes the shift selector displays the oil
level data as in the following examples:
CODE |
MEANING OF CODE
|
| OL,OK,OK |
Oil lever correct |
| OL,LO,01 |
Oil level one quart low -- or as many quarts as needed |
| OL,HI,01 |
Oil level one quart high -- or as many quarts as overfilled |
3. Exit the oil level display mode:
- Using a push-button shift selector, press any range selection button.
- Using a lever shift selector, press the DISPLAY MODE button twice.
B. CLEARING DIAGNOSTIC CODES
The DO NOT SHIFT light may remain illuminated due to false diagnostic codes generated
during vehicle assembly. All false diagnostic codes must be cleared.
Use the following procedure to clear all diagnostic codes:
1. Enter the diagnostic mode:
- Using a push-button shift selector (with oil level sensor),
simultaneously press the (up) and ¯
(down) arrow buttons twice.
- Using a push-button shift selector (without oil level sensor),
simultaneously press the (up) and ¯
(down) arrow buttons once.
- Using a lever shift selector (with oil level sensor), press the
DISPLAY MODE button twice. Do not move the shift lever.
- Using a lever shift selector (without oil level sensor), press the
DISPLAY MODE button once. Do not move the shift lever.
2. Clear codes by holding the MODE button down --
approximately 10 seconds -- until the shift selector tone sounds twice.
3. Restart and drive the vehicle. If the DO NOT SHIFT
light illuminates again, display the diagnostic codes as explained in Section C and record
them for troubleshooting.
C. DISPLAYING DIAGNOSTIC CODES
1. Enter the diagnostic mode (refer to Section B, Step 1).
NOTE: If the DO NOT SHIFT light is illuminated, do not move the lever of a lever shift
selector. If the lever is moved a continuous tone sounds until the lever is moved back to
the position it was in when the DO NOT SHIFT light came on.
2. The code in the first of five code positions displays
on the shift selector. The code display changes every two seconds, displaying the code
list position, main code, and sub code. The display cycle repeats after the sub code is
displayed. A sample code display using main code 25 and sub code 11 follows:
|
SELECT |
MONITOR |
| a. Code list position -- d1 |
d |
1 |
| b. Main code -- 25 |
2 |
5 |
| c. Sub code -- 11 |
1 |
1 |
3. To view the next code, momentarily press the MODE button. Repeat to view each
of the remaining codes.
4. To start over at the first code position, momentarily press the MODE button
after the fifth code position is displayed.
5. To exit the diagnostic mode, do one of the following:
- Do nothing; wait until the calibrated time has passed and the system automatically
returns to normal operation.
- Using a push-button shift selector, simultaneously press the (up) and¯ (down) arrow buttons.
- Using a push-button shift selector, press D (Drive), N (Neutral), or R
(Reverse).
- Using a lever shift selector, press the DISPLAY MODE button.
- Using a lever shift selector, move the shift lever to any position other
than the one it was in when the diagnostic display mode was activated.
NOTE: When a range is selected, that range will be commanded if not inhibited. If the
selected range is inhibited the ECU illuminates the DO NOT SHIFT light and continues to
command the current range. The lever shift selector tone sounds continuously until the
lever is moved back to its original position.
NOTE: WT wiring harnesses must be procured from Allison Transmission. All of the above
procedures (Sections A through C) apply to Allison harnesses only.
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us: Sam Clemmons