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 TM 9-2320-312-24-2
Troubleshooting Section
Allison Wt Automatic Transmissions require an
Table 52
input from the ECM to regulate the transmission
Switch Usage.
shifting. The ECM monitors the accelerator pedal
Setting For
position, engine speed, vehicle speed, load,
Service
Service
Transmission
Brake
Brake
cruise control status and neutral switch status in
Style
Neutral
Clutch
Switch
Switch
Parameter
order to determine if the transmission should use
1
2
closed throttle or full throttle shift modulation. The
"AT/MT/HT Part Throttle Shift Speed" parameter
"Manual
X
X
provides three different settings for shift modulation.
Option 1"
"Manual
Table 54
X
X
X
Option 2"
Alternative
Default
"Automatic
X
"Low" (80% Enable /
"High" (60% Enable /
Option 1"
65% Disable)
45% Disable)
"Automatic
"Medium" (70% Enable
X
X
Option 2"
/ 55% Disable)
"Automatic
X
X
X
Option 3"
Programming the "Transmission Style" to "AT/MT/HT
Option 1", "AT/MT/HT Option 2", "AT/MT/HT Option
"Automatic
X
X
3", or "AT/MT/HT Option 4" activates ECM output 7.
Option 4"
This output controls a shift relay that is connected
"AT/MT/HT
to a modulator in the Allison transmission.
X
Option 1"
The high setting will cause the transmission to
"AT/MT/HT
X
X
remain in a lower gear longer before upshifting to
Option 2"
the next gear. The medium setting is a compromise
"AT/MT/HT
between the default setting and the high setting.
X
X
X
Option 3"
"Fan Pulley Ratio"
"AT/MT/HT
X
X
Option 4"
Note: This feature is only available when "Truck
"Universal
Manufacturer" is programmed to "GMT-560".
X
X
X
X
Option"
OCT01 and newer Personality Modules.
Table 53
This variable is used to calculate the actual fan
Manufacturer
Alternative
Default
speed for control of the fan.
/ Model
GM
"Automatic Option 1",
Universal
Table 55
"Automatic Option 2",
Minimum
Maximum
Default
"Automatic Option 3",
"Automatic Option 4",
0
7.375
1.25
"AT/MT/HT Option 1",
"Manual
"AT/MT/HT Option 2",
GMT-560
Option 2"
"AT/MT/HT Option 3",
"Governor Type"
"AT/MT/HT Option 4"
"Manual Option 1"
OCT01 and newer Personality Modules.
"Manual Option 2"
This parameter determines the type of governor
"Automatic Option 1",
that controls the engine. The Full Range governor
"Automatic Option 2",
"Automatic Option 3",
tries to maintain a constant engine speed for
"Manual
"Automatic Option 4",
a throttle position. The Min/Max Governor only
Other
Option 1"
"AT/MT/HT Option 1",
governs engine speed when the engine speed is
"AT/MT/HT Option 2",
at the minimum allowable engine speed or at the
"AT/MT/HT Option 3",
maximum allowable engine speed. When the engine
"AT/MT/HT Option 4"
is operating between the engine speed limits, the
Min/Max Governor tries to keep power constant
"AT/MT/HT Part Throttle Shift Speed"
across the engine speed range.
JUL99 and newer Personality Modules.
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