Chassis Information --- Section 10
The Executive 2005
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To 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 display. Press the UP and DOWN
arrows again.
• 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 evalua-
tion and possible repair.
• Inactive codes can be cleared by holding the MODE button for approximately three sec-
onds. Some codes are self clearing while others will require service or ignition on/off
cycles to clear.
Periodic Inspections
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.
For easier inspection the transmission should be kept clean. Make periodic 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 transmission. Minor problems can be
kept from becoming major problems if an Allison Transmission distributor or dealer is notified when one
of these conditions occur:
1. Shifting feels odd.
2. Transmission leaks fluid.
3. Unusual transmission-related sounds (changes in sound caused by normal engine thermo-
static fan cycling, while climbing a long grade with a heavy load, have been mistaken for
transmission-related sounds).
4. The CHECK TRANS light comes on frequently.
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