CONTROLS/INSTRUMENTS
2 - 17
mission is held-in-gear. If another pad is de-
pressed, the buzzing sound will continue until the
original range is selected.
Note:
As a light bulb and systems check, the
Do
Not Shift
light will illuminate when the ignition
switch is turned
ON
. After about two seconds the
light will turn off. If the
Do Not Shift
light remains
on, the self-diagnostic system has detected a
problem. If the problem disappears, the light will
go out, but a trouble code will remain stored in
the ECU.
A) Reverse (
R
)
Use this position to back up vehicle. Stop
completely before shifting from forward to
reverse or from reverse to forward. Touch the
reverse (
R
) pad, the pad will light up and the
reverse warning signal will be activated, provided
the
Back Up Alarm Cancel
switch is
ON
(page 2-3).
B) Neutral (
N
)
Use this position to start engine. Select neutral
(
N
) when checking vehicle accessories, and for
extended periods of engine idle operation; par-
king brake must then be applied. The push-
button shifter will automatically select neutral
when the master switch is turned on.
Caution:
Detroit Diesel engines should not be
idled for extended periods at "low" idle. For ex-
tended idling, engine should run at "fast" idle.
Warning:
Always apply parking brake before
leaving driver's seat.
Do not allow your vehicle to "coast" in
Neutral
.
This practice can result in transmission damage.
Also, no engine braking is available in
Neutral
.
C) Drive (
D
)
Use this position for all normal driving conditions.
After touching this pad, the vehicle will start in
first or second range and will automatically up-
shift to a higher range as output speed in-
creases. As the vehicle slows down, output
speed decreases, and the transmission automa-
tically downshifts to the correct range. If a locked
brake or a slick surface condition should occur,
the ECU (Electronic Control Unit) will command
converter operation (disconnect lockup) and in-
hibit downshifts for a period of time or until nor-
mal wheel speed has been restored.
Note:
The transmission should normally be al-
lowed to shift itself, but manual shifting can be
used as described below.
D) Fourth (
4
) and Third (
3
) Ranges
Select these ranges when driving on moderate
grades, or when load and traffic conditions re-
quire the use of limited speed.
E) Second (
2
) Range
Select this range when operating in heavy and
congested traffic. The transmission will start in
first and automatically upshift to second. When
slowing, the transmission will automatically
downshift to first range. Low ranges provide
progressively greater engine* and retarder*
braking power (the lower the range, the greater
the engine* and retarder* braking effect).
F) First (
1
) Range
Select this range when pulling through mud and
snow, or when speed control is needed for dri-
ving up steep grades. This range also provides
maximum engine* braking power or retarder*
braking effect. In the lower ranges (1, 2, 3, and
4), transmission will not upshift above the
highest gear selected unless recommended
engine governed speed for that gear is
exceeded.
Caution:
Service brakes (foot pedal) should not
be used to control the speed of vehicle on long,
steep descents. Instead, lower transmission
ranges should be used (in conjunction with out-
put retarder*). When descending in lower
ranges, care must be taken that engine speed
does not exceed 2450 rpm. This procedure
keeps service brakes cool and ready for emer-
gency stopping.
(*) Refers to
Jacobs Engine Brake
and
Trans-
mission Retarder
headers, page 4-3 and
page 4-4.
