TRANS light is on, upshifts and downshifts will be restricted and direction
changes will not occur. Lever and push-button shift selectors do not respond
to any operator shift request while the CHECK TRANS light is illuminated.
The lockup clutch is disengaged when transmission shifting is restricted, or
during any critical transmission malfunction.
Diagnostic Codes
The diagnostic codes are numerical representations of malfunctions in the
transmission operations. Each code is a two digit main code and a two digit
sub code. The codes, when detected, are logged in the ECU memory. These
codes will fall in two classes: active and inactive. Active codes are codes cur-
rently effecting the ECU process. Inactive codes are retained but may not
effect the ECU process. The diagnostic mode must be entered. A maximum
of five codes, D1 to D5, may be listed at one time. The highest priority code
will be listed in D1. The MODE button will enable selection of sequential
codes.
• Enable Diagnostic Code Selection Display.
• Stop the motorhome at a safe location.
• Apply the parking brake.
• Simultaneously press the up and down arrows twice to enter the stored
codes. The first time the arrows are pressed will indicate the oil level
sensor information.
• The codes will display one digit at a time.
• The mode button is pressed to scroll through the codes.
• Any code obtained should be noted and reported to an Allison Service
Center for evaluation and possible repair.
• Inactive codes can be cleared by holding the MODE button for approxi-
mately 3 seconds. Some codes are self clearing while others will
require service or ignition cycles to clear.
The Allison MT Series requires minimum maintenance. Careful attention
to the fluid level and the connections for the electronic and hydraulic circuits
is very important.
For easier inspection, the transmission should be kept clean. Make period-
ic checks for loose bolts and leaking fluid lines. Check the condition of the
electrical harnesses regularly. Check the engine cooling system occasionally
for evidence of transmission fluid which would indicate a faulty oil cooler.
Report any abnormal condition to an Allison dealer.
Prevent Major Problems
Help the WTEC III control system oversee the operation of the transmis-
sion. Minor problems can be kept from becoming major problems if you
notify an Allison Transmission distributor or dealer when one of these
conditions occur:
Chassis Information
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WINDSOR
10•289
Transmission -
Periodic Inspection
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