Section 10 --- Chassis Information
The Executive 2005
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The Importance of Proper Fluid Levels:
Transmission fluid cools, lubricates and transmits hydraulic power. Proper fluid levels must be main-
tained at all times. If fluid level is too low, the converter and clutches do not receive an adequate supply
of fluid. If fluid level is too high, the fluid can aerate. Aerated fluid can cause the transmission to shift
erratically or overheat.
The MH Series oil level sensor (OLS) allows the operator to obtain an indication of sensor
fluid level from the keypad shift selector. Frequently check for the presence of oil level diagnostics in
the transmission. If the OLS has not been detected, troubleshooting of the OLS circuit is required. This
will have to be performed by an Allison Service Center. After the OLS circuit is repaired, ensure that
reset of the “auto-detect” or manual selection of the OLS function by using a Pro-Link transmission
diagnostic center.
Fluid Level Check with the Keypad:
To Enter Oil Level Sense Mode:
• Park the motorhome on a level surface. Place the transmission in "N" and set parking
brake.
• The transmission temperature must be at least 140º F./60º C, otherwise an error code will
appear.
• The motorhome must be stationary and in Neutral for approximately two minutes to allow the
fluid to settle in the sump.
• The engine must be idling lower than 800 RPM.
• Simultaneously press the Up and Down buttons once.
The transmission is now in Oil Level Sense mode. The display will indicate one character at a time.
An "o" followed by "L" represents oil level check mode. One of the following will be indicated:
• "o K" represents the level is okay.
• "Lo" represents a low fluid level followed by a numeric
indication of the number of quarts needed fill the sump.
• "HI" represents an overfull condition followed by a
numeric indication of the number of quarts the sump is
overfull.
• A countdown of flashing numbers indicate the fluid is still
settling. When the fluid has stabilized in the sump the true
level will be indicated.
• If an "o" "L" "-" followed by a number displays, the oil
level sensor could not read the level due to one of condi-
tions listed in the “Common Oil Level Fault Codes” chart.
Common Oil Level Fault Codes:
Display Cause of Code
o,L - O,X Setting time too short
o,L - 5,0 Engine speed (RPM) too low
o,L - 5,9 Engine speed (RPM) too high
o,L - 6,5 Neutral must be selected
o,L - 7,0 Sump fluid temperature too low
o,L - 7,9 Sump fluid temperature too high
o,L - 8,9 Output shaft rotation
o,L - 9,5 Sensor failure
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