DIAGNOSTIC CODE DISPLAY PROCEDURE
Diagnostic codes can be read and cleared by two methods:
• Using an Allison DOC™ diagnostic tool. For specific instructions on how
to use an Allison DOC™ diagnostic tool, refer to the User Guide.
• Using the pushbutton or lever shift selector.
Pushbutton Shift Selector. To begin the Diagnostic Process:
1. Bring the vehicle to a stop at a safe location.
2. Apply the parking brake.
To Display Stored Codes:
1. Simultaneously press the ↑ (Up) and ↓ (Down) arrow buttons once to
access the Oil Level Display Mode—press the buttons a second time to
access the Diagnostic Display Mode.
2. Observe the digital display for codes.
— Diagnostic codes will appear one digit at a time on WTEC III
pushbutton or lever shift selectors.
— Diagnostic codes will appear two characters at a time on Allison 4
th
Generation Controls pushbutton or lever shift selectors.
3. Press the MODE button to see the next code—repeat for subsequent codes.
NOTE: Be sure to record all codes displayed before they are cleared.
This is essential for troubleshooting.
To Clear Active Indicators and Inactive Codes then Resume Vehicle Operation:
1. Clear active indicators and inactive codes.
— WTEC III Controls—To clear active indicators such as the CHECK
TRANS light, press and hold the MODE button for approximately
three seconds until the MODE INDICATOR (LED) flashes. Release
the MODE button and active indicators will not be illuminated. To
clear inactive codes, press and hold the MODE button for 10 seconds.
Some codes are self-clearing and others require ignition cycles to clear.
— Allison 4
th
Generation Controls—Press and hold the MODE button for
10 seconds to clear both active indicators and inactive codes.
2. Begin operating as normal—have the transmission checked at the earliest
opportunity by an Allison Transmission distributor or dealer.
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