Indications from the shift selector are provided to inform the operator that
the transmission is not performing as designed and is operating with reduced
capabilities. Before turning the ignition off, the transmission may be operated
for a short time in the selected range in order to “limp home” for service
assistance. Service should be performed immediately in order to minimize
potential for damage to the transmission.
When the CHECK TRANS light comes on, and the ignition switch is
turned off, the transmission will remain in N (Neutral) until the condition
causing the CHECK TRANS light is corrected. Generally, while the
CHECK 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
currently 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
approximately three seconds. Some codes are self clearing while
others will require service or ignition cycles to clear.
The Allison MH Series requires minimum maintenance. Careful attention
to the fluid level and the connections for the electronic and hydraulic circuits
is very important.
Chassis Information
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DIPLOMAT 10•293
Transmission
- Periodic
Inspections
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