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Overdrive Operation
The overdrive automatic transmission contains an elec-
tronically controlled 5th gear (OVERDRIVE). The trans-
mission will automatically shift from 4th gear to OVER-
DRIVE if the following conditions are present:
•
the transmission selector is in DRIVE
•
the engine coolant has reached normal operating tem-
perature
•
the vehicle speed is above approximately 30 mph
(48 km/h)
•
the transmission has reached normal operating
temperature
NOTE: If the vehicle is started in extremely cold tem-
peratures, the transmission may not shift into OVER-
DRIVE and will automatically select the most desirable
gear for operation at this temperature. Normal operation
will resume when the transmission fluid temperature has
risen to a suitable level. Refer also to the note under
torque converter clutch later in this section.
During cold temperature operation, you may notice
delayed upshifts depending on engine and transmission
temperature. This feature improves the warm up time of
the engine and transmission.
During cold temperature operation, the transmission
may not downshift from 2nd gear to 1st gear after the
initial 1st to 2nd gear upshift.
Transmission Limp Home Mode
Transmission function is monitored for abnormal condi-
tions. If a condition is detected that could result in
transmission damage, the Transmission Limp Home
Mode will be engaged. In this mode, the transmission
will remain in the current gear until the vehicle is
brought to a stop.
STARTING AND OPERATING 273
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