Dodge 2001 Ram 1500 Owner's Manual page 2347

21 - 712 AUTOMATIC TRANSMISSION - 47RE
ELECTRONIC GOVERNOR (Continued)
WIDE OPEN THROTTLE OPERATION
In wide-open throttle (WOT) mode, adaptive memory
in the PCM assures that up-shifts occur at the prepro-
grammed optimum speed. WOT operation is determined
from the throttle position sensor, which is also a part of
the emission control system. The initial setting for the
WOT upshift is below the optimum engine speed. As
WOT shifts are repeated, the PCM learns the time
required to complete the shifts by comparing the engine
speed when the shifts occur to the optimum speed. After
each shift, the PCM adjusts the shift point until the
optimum speed is reached. The PCM also considers
vehicle loading, grade and engine performance changes
due to high altitude in determining when to make WOT
shifts. It does this by measuring vehicle and engine
acceleration and then factoring in the shift time.
TRANSFER CASE LOW RANGE OPERATION
On four-wheel drive vehicles operating in low
range, the engine can accelerate to its peak more
rapidly than in Normal range, resulting in delayed
shifts and undesirable engine flare. The low range
governor pressure curve is also higher than normal
to initiate upshifts sooner. The PCM compares elec-
tronic vehicle speed signal used by the speedometer
to the transmission output shaft speed signal to
determine when the transfer case is in low range.
REMOVAL
(1) Hoist and support vehicle on safety stands.
(2) Remove transmission fluid pan and filter.
(3) Disengage wire connectors from pressure sen-
sor and solenoid (Fig. 71).
(4) Remove screws
retainer to governor body.
Fig. 71 Governor Solenoid And Pressure Sensor
1 - PRESSURE SENSOR
2 - PRESSURE SOLENOID
3 - GOVERNOR
holding pressure solenoid
(5) Separate solenoid retainer from governor (Fig.
72).
(6) Pull solenoid from governor body (Fig. 73).
(7) Pull pressure sensor from governor body.
(8) Remove bolts holding governor body to valve
body.
Fig. 72 Pressure Solenoid Retainer
1 - PRESSURE SOLENOID RETAINER
2 - GOVERNOR
Fig. 73 Pressure Solenoid and O-ring
1 - PRESSURE SOLENOID
2 - O-RING
3 - GOVERNOR
BR/BE