CHASSIS INFORMATION — 10
232
20 08 CONTESSA
code will be listed in D1. The Mode button
will enable selection of sequential codes.
Allison 4th Generation controls list each code
consisting of ve characters. The rst being a
letter followed by a four digit number string.
The most severe or recent code is listed in the
ECU memory rst with a maximum of ve
codes being d1 to d5 possibly listed at the same
time. When new codes are added, the oldest
inactive codes are 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 uid 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 uid. Check the condition of the
electrical harnesses regularly. Check the engine
cooling system occasionally for evidence of
transmission uid that would indicate a faulty
oil cooler. Report any abnormal condition to an
Allison Service Center.
Prevent Major Problems:
Help the control system oversee the operation
of the transmission. Minor problems can be kept
from becoming major problems if an Allison
Transmission Service center is notied when one
of these conditions occur:
1. Shifting feels odd.
2. Transmission leaks uid.
3. Unusual transmission-related
sounds (sound made by normal
engine thermostatic fan cycling
when climbing a long grade with a
heavy load are often mistaken for
transmission-related sounds).
4. The Check Trans indicator comes on
frequently.
TRANSMISSION FLUID & FILTERS
The transmission is lled with TranSynd
™
synthetic transmission uid at the factory.
TranSynd synthetic transmission uid extends
service intervals. A
small tag has been
attached to the dipstick
identifying that
the transmission is
lled with TranSynd
synthetic transmission
uid.
Fluid and Filter Change Interval:
The transmission has two lters: a Main lter
and a Lube lter. Follow the service intervals listed
in the transmission OEM (Original Equipment
Manufacturers) manual. Fluid and lters may
require changing earlier than recommended in
the transmission OEM manual depending on the
severity of operating conditions. Fluid must also be
changed whenever there is evidence of dirt or high
temperature operation as indicated by
discoloration, strong odor or uid analysis. Local
conditions, severity of operation or duty cycle will
dictate more or less frequent service intervals.
CAUTION:
DO NOT mix Dexron III
®
transmission
fluid with TranSynd
™
Synthetic
transmission fluid.
NOTE:
Refer to the Allison transmission owner’s
manual or contact an authorized Allison
service center for fluid and both filters
service intervals.
Located inside interior
engine access
070176
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