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If the transmission temperature exceeds normal operating
limits, the powertrain controller will modify the transmis-
sion shift schedule and expand the range of torque con-
verter clutch engagement. This is done to prevent trans-
mission damage due to overheating.
If the transmission becomes extremely hot or is in danger
of overheating, the “Transmission Temperature Warning
Light” may illuminate and the transmission may operate
differently until the transmission cools down.
NOTE:
Use caution when operating a heavily loaded vehicle
at low speeds (such as towing a trailer up a steep grade, or in
stop-and-go traffic) during hot weather. In these conditions,
torque converter slip can impose a significant additional heat
load on the cooling system. Downshifting the transmission to
the lowest possible gear (when climbing a grade), or shifting
to NEUTRAL (when stopped in heavy traffic) can help to
reduce this excess heat generation.
During cold temperatures, transmission operation may be
modified depending on engine and transmission tempera-
ture as well as vehicle speed. This feature improves warm up
time of the engine and transmission to achieve maximum
efficiency. Engagement of the torque converter clutch is
inhibited until the transmission fluid is warm (refer to the
“Note” under “Torque Converter Clutch” in this section).
On models with 66RFE transmission, top overdrive gear is
also inhibited until the transmission fluid is warm, and
during extremely cold temperatures (-16°F [-27°C] or be-
low), operation may briefly be limited to first and direct
gears only. On trucks with AS66RC transmission, fifth and
sixth gears may be inhibited briefly on cold starts below
41°F (5°C), and during very cold temperatures (-4°F [-20°C]
or below), operation may briefly be limited to third gear
only. During this condition, the ability of the vehicle to
accelerate under heavily loaded conditions may be re-
duced. In all cases, normal operation will resume once the
transmission temperature has risen to a suitable level.
Transmission Limp Home Mode
Transmission function is monitored electronically for ab-
normal conditions. If a condition is detected that could
result in transmission damage, Transmission Limp Home
Mode is activated. In this mode, the transmission remains
in fourth gear (for 66RFE transmission) or third gear (for
AS66RC transmission) regardless of which forward gear is
selected. If an AS66RC equipped truck enters Limp Home
Mode at highway speeds, it will initially engage fifth gear,
until the vehicle slows to a speed where third gear can be
engaged. PARK, REVERSE, and NEUTRAL will continue
to operate. The Malfunction Indicator Light (MIL) may be
6
STARTING AND OPERATING
251
Содержание Chassis CAB 2018
Страница 4: ......
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Страница 11: ...GRAPHICAL TABLE OF CONTENTS CONTENTS FRONT VIEW 10 REAR VIEW 11 INSTRUMENT PANEL 12 INTERIOR 13 2...
Страница 13: ...REAR VIEW Rear View 1 Rear Lights 2 GRAPHICAL TABLE OF CONTENTS 11...
Страница 16: ......
Страница 88: ...Uconnect 4C 4C NAV With Automatic Temperature Controls 86 GETTING TO KNOW YOUR VEHICLE...
Страница 97: ...Operating Tips Chart 3 GETTING TO KNOW YOUR VEHICLE 95...
Страница 275: ...Fast Tone Continuous Tone 6 STARTING AND OPERATING 273...
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Страница 374: ...Finger Tabs Finger Tab 372 SERVICING AND MAINTENANCE...
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Страница 438: ......
Страница 487: ...Uconnect 3 Uconnect 4C 4C NAV 10 MULTIMEDIA 485...
Страница 491: ...Uconnect 3 0 Uconnect 3 10 MULTIMEDIA 489...
Страница 504: ......
Страница 511: ...INDEX 12...