Specifications

94
Data Parameters Transmission Parameters
SHIFT VALVE 1-2/4-5
SHIFT VALVE 2-3
SHIFT VALVE 3-4
Range: ____________________________________________________ OPEN/CLOSED
Used on the EGS system. These parameters display the state of the shift solenoids. OPEN
means that the valve is energized, or ON, and is allowing fluid to pass. CLOSED means that the
valve is de-energized, or OFF, and is not allowing fluid to pass.
The up/down shift solenoids function as follows: If a solenoid is energized, it opens and transmits
shift valve pressure to the corresponding command valve. The solenoid valve remains energized
and open until the shift process is completed. When the solenoid valve is de-energized, the
pressure in the shift valve pressure line to the command valve is reduced to zero.
SHIFT VALVE DUTY CYCLE
Range: _________________________________________________________ 0 to 100%
Used on the EGS system. This parameter displays torque converter PWM solenoid duty cycle in
percent (not shift valve). The PWM solenoid valve with defined slippage, controls the operating
phase of the torque converter lockup clutch. A duty cycle of 80 percent or greater means that the
torque converter is fully locked up. The torque converter clutch is applied only in 3rd, 4th, or 5th
gears, and when certain conditions are met: accelerator pedal position, altitude, transmission
shift functions, ATF temperature, oil-monitoring status, load conditions, and engine management.
In order to equalize tolerances and wear, data is stored permanently in the electronic
transmission controller (ETC). The modulating working pressure determines the torque converter
lockup control pressure and regulates the torque converter lockup control valve. The PWM
solenoid controls the lockup clutch placing it in an engaged, disengaged, or a slipping condition.
In the bottom position of the torque converter lockup control valve (lockup without pressure), the
lubrication flows through the torque converter and the fluid cooler back into the transmission. In
its regulation position (slipping, lockup clutch pressurized) a reduced lubrication amount flows
through the annular gap directly through the cooler to the transmission bypassing the torque
converter. The remaining portion of the oil is routed through an orifice into the torque converter
for cooling the lockup clutch.
The PWM solenoid is also used to control the rate of torque converter clutch apply and release.
The solenoid ability to “ramp” apply and release pressure results in a smoother apply and
release of the torque converter clutch in all conditions. Also see PWM SOLENOID VALVE
STATUS for more information.
SLIPPAGE RPM (NOM. VALUE)(1/MIN)
SLIPPAGE RPM (CUR. VALUE)(1/MIN)
Range: __________________________________________________ –500 to 3000 RPM
Used on the EGS system. This parameter displays the difference between the engine RPM and
the RPM of the front sun gear of the transmission. A negative value indicates that the engine
RPM is less than the front sun gear (deceleration). A positive value indicates that the engine
RPM is greater than the RPM of the front sun gear. The nominal value (NOM. VALUE) is stored
in the electronic control module as a base reference for adaptation calculation. The current value
(CUR. VALUE) is the amount of converter slippage and the state of the torque converter lock up.
The electronic transmission controller (ETC) samples these values once per minute.
SLV DEMAND
Range: ______________________________________________________ not available
No information is available at this time.