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Shift Selector
The keypads on the shift
control are R (Reverse),
N (Neutral), D (Drive),
Arrow up, Arrow down,
Mode button. A digital
display window shows
gear selection, various
transmission modes, oil
level and transmission
fault codes. Generation 4 keypads have a split
screen displaying two number sets while in
drive. The left number displays the highest
forward range available. The right number is
the range that the transmission is currently
in. NN (Neutral) will appear in the display
window when the ignition is turned On. This
indicates the transmission is in neutral and
it is safe to start the crank. If the NN does
not display when the ignition is turned on,
there is no power to the shift selector and
the transmission will not allow the engine to
start. No display is an indicator of electrical
problems with the engine batteries, ECU or the
shift selector.
Keypad Functions:
Select the Reverse gear by pressing R.
RR will display.
Select Neutral by pressing N. The area
around the N button has a raised ridge
so the driver can orient his hand to the
push buttons by touch without looking
at the display.
Select Drive range by pressing D. The
highest forward gear (6th gear) appears
in the display and the transmission will
shift to first gear indicated as 6 1.
The Up and Down arrow buttons are
used to select a higher (if not in "6")
or lower (if not in "1") forward range.
These buttons are not functional in
Neutral or Reverse.
When in Drive, one press changes
the gear range selected by one. If
the button is held continuously, the
selected range will continue to change
up or down until the button is released
or until the highest/lowest possible
080355g
range of gears is selected.
The Mode button enables a secondary
shift point to be selected. This is
commonly referred to as Economy
mode. Economy mode affects the
upshift schedule 3-4, 4-5, 5-6 and
downshift schedule 6-5, 5-4, 4-3.
During highway driving, with the
cruise control set between 55 and 65
m.p.h., setting the transmission to
economy mode will eliminate about
99% of transmission downshifts from
sixth to fifth when incurring a slight
incline or overpass.
CAUTION
DO NOT use Economy Mode in heavy
stop and go traffic or mountainous
terrains. Frequent shifting while using
heavy throttle occurs in Economy
Mode and increases transmission fluid
temperature. Exit Economy Mode
until road conditions improve.
NOTE
The Mode button is used by the service
technician to access diagnostic codes
when troubleshooting. The diagnostic
circuitry must be enabled to display.
NOTE
Cruise control switch enabled alerts
the shift schedule. Turn off the cruise
power switch in congested traffic and
mountainous terrain.
CAUTION
Engine temperature may rise when
ascending long grades using full
throttle. Towing a load will increase
the demand on the engine. If this
occurs, manually shift the transmission
to the next lower gear and use less
throttle. The engine will use less fuel
and RPM should increase.
NOTE
The transmission will not accept a
manually selected gear change to
occur if the gear selected is out of the
specified operating range.
NOTE
The transmission will not shift into
gear from Neutral if the engine RPM is
at or above 900. The display will flash
"66" indicating the engine RPM is
excessive. Select "N" and lower engine
RPM.
Check Trans Indicator
The electronic control system of the
transmission is programmed to inform the
operator of a problem with the transmission
system and reacts automatically to protect the
operator, motorhome and transmission. When
the Electronic Control Unit (ECU) detects a
DO NOT SHIFT (DNS) condition the ECU
restricts shifting, turns on the CHECK TRANS
light in the instrument panel and registers a
fault code.
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Troubleshooting
