Specifications

93
Data Parameters Transmission Parameters
identifiers are stored in its acceptance list. This very high frequency transmission requires a
“twisted pair” of wires to address electromagnetic interference (EMI) concerns. Two wires also
ensure communication if one wire is damaged and provide the ability to recognize a CAN circuit
fault. The two lines must not be interchanged as each represents either a high or low level.
SELECTOR LEVER POSITION
Range: ___________________________________________________________PN/RD1
Used on EGS, ERE/EVE/ASF, HFM, LH, ME10, ME20, ME27, and ME28 systems. This
parameter indicates the gear selector lever position. The display shows the selected range
position, not the current gear that transmission is operating in. Selector lever downshifts are not
performed if high engine RPM is sensed. In order to use the engine braking effect when driving
on declines with the cruise control engaged, active downshifts can go as low as 3rd gear. These
downshifts become effective at about 4 mph (6 km/h) and speeds below 78 mph (126 km/h). In
addition, under non-cruise control operation, declines are recognized by comparison of engine
load with driving resistance, then the shift points may be altered. Downshifts under load may
cross several gear changes, as they are performed directly and not in individual steps.
SHIFT ABORT
SHIFT APPROVED
SHIFT DOUBLE
SHIFT FREQUENCY
Range: __________________________________________________________ YES/NO
Used on the EAG and EGS electronic transmission control (ETC) systems. These parameters
indicate the status of the ETC gearshift control variables. No further information is available at
this time.
SHIFT LINE EVALUATION
Range: ________________________________________________________ 1, 2, 3, 4, 5
Used on the EGS electronic transmission controller (ETC) system. This parameter evaluates
gear selector position for gears 1, 2, 3, 4, and 5.
In Park or Neutral, this parameter may read “1.”
SHIFT POINT
Range: __________________________________________________________ ON/OFF
Used on HFM systems. An ON reading means that the transmission has shift point variability.
SHIFT PRESSURE DEVIATION(MBAR)
Range: ______________________________________________________ not available
Used on the EGS system. Shift pressure is monitored during gear change. The nominal valve is
stored in the electronic transmission controller (ETC) and is used as a base for adaptation to
compensate for wear. The shift pressure is defined as the time it takes to disengage one shift
member while another is being applied. Shift pressure deviation is the ability of the ETC to
electronically alter the time it takes to go from one gear to another. The ETC optimizes shift
pressure for smoother shifting and reducing clutch wear. The control module adapts the shift
program according to driving style, accelerator pedal position and deviation of vehicle speed.
The following factors influence the shift program: road condition, incline, decline, altitude, trailer
operation, loading, catalytic converter warm-up, cruise control operation, sporty driving style, and
low or high ATF temperature.