GM
> Transmission > Auto Shift Properties
Force Motor
These values are the calibration of the transmission force motor
(pressure control solenoid) versus desired line pressure and
transmission temperature. The force motor is a relief valve that
requires a current to reduce line pressure, the higher the current
the lower the resulting line pressure. It is not recommended to
change these values unless you have modified the transmission
pressure control solenoid or are experiencing trans slip under
heavy load. If you increase the Max Line Pressure constant, you may
have to set the values in the 100 column to match (or be slightly
lower) than the 96 column. Certain calibrations have to 100 column
set to 1245ma (full line pressure bleed off).
- Force Motor Current vs. Commanded Line Pressure vs. Temp -
Positive: This table determines how much current is applied to
achieve the desired line pressure in relation to transmission
temperature.
- Force Motor Current vs. Commanded Line Pressure vs. Temp -
Negative: This table determines how much current is applied to
achieve the desired line pressure in relation to transmission
temperature.
Desired Shift Time
This is the desired shift time for each part throttle shift.
- Desired Shift Time vs. Torque - Normal: Normal Mode
desired shift time (secs)
- Desired Shift Time - Normal: Normal Mode desired shift
time
- Desired Shift Time Adder- Normal: Normal Mode desired
shift time adder
- Desired Shift Time vs. Torque - Performance: Performance
Mode desired shift time (secs)
- Desired Shift Time - Performance: Performance(Tow/Haul)
Mode desired shift time
- Desired Shift Time Adder- Performance: Performance
Mode(Tow/Haul) desired shift time adder
TUTD
- TUTD Mode Select: Enable/disable TUTD feature.
- TUTD Type: Selects the method used to wire the TUTD
switch
- TUTD IP Display: Enable/disable the TUTD mode
display
- TUTD UpDown Enable Req: Enable/disable the requirement
for an up/down request and a mode request to enable TUTD
- TUTD Hold Shift Enable: Enable/disable a shift to occur
if the driver is holding down the TUTD switch
- TUTD Mountain Mode: Enable/disable powertrain braking
the TUTD downshifts, when in D3
- TUTD Range Select: Enable range select TUTD mode
activation, otherwise use state of TUTD switch
- TUTD Range Select Gear: When range select TUTD mode is
enabled this selector position enables TUTD mode
Shift Pressure
These tables define the desired transmission line pressure in
relation to input torque and current gear. These tables are used to
modify your transmission shift pressures.
- Base Shift Pressure vs. Torque vs. Gear - Normal: Normal
Mode Desired Shift pressure. Table returns the pressure offset to
be used on the Force Motor Current table axis. Increasing these
values firms the shift. Value range is from 0 to 96
- Base Shift Pressure vs. Torque vs. Gear - Performance:
Performance Mode Desired Shift pressure. Table returns the pressure
offset to be used on the Force Motor Current table axis. Increasing
these values firms the shift. Value range is from 0 to 96
- Brake Shift Pressure vs. Torque vs. Gear: During a
manual downshift using the gear selector, this alternate table is
used to modify the line pressure. If this table is not in use, the
Engine Braking downshift will be taken from the base shift pressure
table(s). Table returns the pressure offset to be used on the Force
Motor Current table axis. Increasing these values firms the manual
downshift.
- Max Line Pressure: This is the maximum desired line
pressure allowed. It is a clamp for any shift table value and has
the final say on the line pressure offset before it is used on the
Force Motor Current table.
Shift Pressure Modifier
- Upshift and Downshift Pressure Modifier: These tables
are a modifier to the returned base shift pressure tables. It
increases/decreases the pressure by adding positive or negative
pressure depending on torque and trans temperature. Increasing
these with a positive values firm the shift. Zero has no
effect.
- Upshift Pressure Modifier Mult vs. Temp vs. Gear: An
optional table multiplier to the returned base shift pressure
tables. It increases/decreases the pressure depending on shift and
trans temperature. Increasing the multiplier firm the shift. 1= no
change.
Shift Pressure Adapt
- Upshift Adapt: Master enable/disable for upshift
pressure adapt
- Downshift Adapt: Master enable/disable for WOT(detent)
downshift pressure adapt
Oncoming Pressure Preset
- Oncoming 2nd: Base Preset(TAP) Oncoming clutch pressure
for 1-2 shift
- Oncoming 3rd: Base Preset(TAP) Oncoming clutch pressure
for 2-3 shift
- Oncoming 4th: Base Preset(TAP) Oncoming clutch pressure
for 3-4 shift
- Oncoming 5th: Base Preset(TAP) Oncoming clutch pressure
for 4-5 shift
- Oncoming 6th: Base Preset(TAP) Oncoming clutch pressure
for 5-6 shift
Offgoing Pressure Preset
- Offgoing 2nd: Base Preset(TAP) Offgoing clutch pressure
for 1-2 shift
- Offgoing 3rd: Base Preset(TAP) Offgoing clutch pressure
for 2-3 shift
- Offgoing 4th: Base Preset(TAP) Offgoing clutch pressure
for 3-4 shift
- Offgoing 5th: Base Preset(TAP) Offgoing clutch pressure
for 4-5 shift
- Offgoing 6th: Base Preset(TAP) Offgoing clutch pressure
for 5-6 shift
Clutch Volume Preset
- Shift Clutch Volume Preset - 2nd: Base Preset(TAV)
clutch volume for 1-2 shift
- Shift Clutch Volume Preset - 3rd: Base Preset(TAV)
clutch volume for 2-3 shift
- Shift Clutch Volume Preset - 4th: Base Preset(TAV)
clutch volume for 3-4 shift
- Shift Clutch Volume Preset - 5th: Base Preset(TAV)
clutch volume for 4-5 shift
- Shift Clutch Volume Preset - 6th: Base Preset(TAV)
clutch volume for 5-6 shift