chassIs InformatIon — 10
218
2 0 0 8 K n I G h t
Continued illumination of the CHECK
TRANS light during vehicle operation (other
than start up) indicates that the ECU has signaled
a diagnostic code. Illumination of the CHECK
TRANS light is accompanied by a flashing
display from the shift selector. The shift selector
display will show actual range attained and the
transmission will not respond to shift selector
requests.
Indications from the shift selector are provided
to inform the operator that the transmission is
not performing as designed and is operating at
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 damage to the transmission.
When the Check Trans icon illuminates the
keypad will not respond to command and the
transmission generally will downshift to 4th
gear. The torque converter will not “lock-up”
and engine speed is automatically reduced.
Direction changes (i.e. forward to reverse) will
not be allowed. Locate a safe secure place to
park the motorhome. If the engine is shut off,
then engaged after a Check Trans indication,
the transmission remains in Neutral until the
fault causing the Check Trans light has been
corrected.
NOTE
Contact an authorized Allison
Transmission service center whenever
a transmission related concern arises.
For some problems, fault codes
may be registered without the ECU
activating the Check Trans indicator. An
authorized Allison Transmission Service
center will have the equipment to check
diagnostic codes and correct problems
that may arise.
Diagnostic Codes:
The shift selector can be used to display
transmission malfunctions as numerical codes.
Each code is a two-digit main code and a
two-digit sub code. These codes will fall in
two classes: active and inactive. Active codes
are codes currently affecting the ECU process
and transmission operation. Inactive codes are
retained in memory but may not affect the ECU
process or transmission operation. A service
technician will activate Diagnostic mode or hook
an electronic display (Pro-Link) to the data plug
to retrieve diagnostic codes. 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. Allison 4th Generation controls list each
code consisting of five characters. The first being
a letter followed by a four digit number string.
The most severe or recent code is listed in the
ECU memory first with a maximum of five
codes being d1 to d5 possibly listed at the same
time. When new codes are added, the oldest
inactive codes will be dropped.
To Display Diagnostic Codes:
Stop the motorhome at a safe location.
Apply the parking brake.
Simultaneously press the up and down
arrows once to enter oil level display
mode. Then press the up and down
arrows again to enter diagnostic mode.
The codes will display one digit at a
time or two characters at a time on 4th
Generation controls.
Press the mode button to scroll through
the codes.
Record all diagnostic codes that are
displayed. The codes then can be used by
an Allison Service Center for evaluation
and repair.
Inactive codes can be cleared by holding
the Mode button for approximately three
seconds. 4th Generation controls require
holding the Mode button for ten seconds
to clear both inactive and active codes.
Some codes are self-clearing while others will
require service or ignition on/off cycles to clear.
Periodic Inspections
The Allison MH Series requires very little
maintenance. Careful attention to the fluid level,
electrical connections and hydraulic hoses is
very important.
The transmission should be kept clean for easy
inspection. Make periodic checks for loose bolts
and leaking fluid. Check the condition of the
electrical harnesses regularly. Check the engine
cooling system occasionally for evidence of
transmission fluid that would indicate a faulty
oil cooler. Report any abnormal condition to an
Allison Service Center.
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