Page 1721 of 2339
Fig. 278 Overdrive/Underdrive Shafts
1 - OVERDRIVE SHAFT
2 - #3 THRUST PLATE (3 TABS)
3 - #3 THRUST WASHER (5 TABS)4 - UNDERDRIVE SHAFT
5 - #2 NEEDLE BEARING (3 TABS)
6 - INPUT CLUTCH ASSEMBLY
21 - 260 41TE AUTOMATIC TRANSAXLERS
INPUT CLUTCH ASSEMBLY (Continued)
Page 1722 of 2339

OIL PUMP
DESCRIPTION
The oil pump is located in the pump housing inside
the bell housing of the transaxle case (Fig. 279). The
oil pump consists of an inner and outer gear, a hous-
ing, and a cover that also serves as the reaction shaft
support.
OPERATION
As the torque converter rotates, the converter hub
rotates the inner and outer gears. As the gears
rotate, the clearance between the gear teeth
increases in the crescent area, and creates a suction
at the inlet side of the pump. This suction draws
fluid through the pump inlet from the oil pan. As the
clearance between the gear teeth in the crescent area
decreases, it forces pressurized fluid into the pump
outlet and to the valve body.
DISASSEMBLY
When disassembling the transaxle it is necessary
to inspect the oil pump for wear and damage.
(1) Remove the reaction shaft support-to-pump
body bolts (Fig. 280).
(2) Remove reaction shaft support from pump
housing (Fig. 281).
Fig. 279 Oil Pump Assembly
1 - PUMP BODY
2 - OUTER GEAR
3 - INNER GEAR
4 - REACTION SHAFT SUPPORT
5 - SEAL RINGS (4)
6 - REACTION SHAFT
7 - CRESCENT
Fig. 280 Reaction Support-to-Pump Body Bolts
1 - BOLT (6)
2 - PUMP BODY
3 - REACTION SHAFT SUPPORT
Fig. 281 Reaction Shaft Support
1 - PUMP BODY
2 - PUMP GEARS
3 - REACTION SHAFT SUPPORT
RS41TE AUTOMATIC TRANSAXLE21 - 261
Page 1723 of 2339

(3) Remove the pump gears (Fig. 282) and check
for wear and damage on pump housing and gears.
(4) Re-install the gears and check clearances.
(5) Measure the clearance between the outer gear
and the pump pocket (Fig. 283). Clearance should be
0.089±0.202 mm (0.0035-0.0079 in.).(6) Measure clearance between outer gear and
crescent (Fig. 284). Clearance should be 0.060-0.298
mm (0.0023-0.0117 in.).
(7) Measure clearance between inner gear and
crescent (Fig. 285). Clearance should be 0.093-0.385
mm (0.0036-0.0151 in.).
Fig. 282 Oil Pump Assembly
1 - PUMP BODY
2 - OUTER GEAR
3 - INNER GEAR
4 - REACTION SHAFT SUPPORT
5 - SEAL RINGS (4)
6 - REACTION SHAFT
7 - CRESCENT
Fig. 283 Measuring Outer Gear-to-Pocket
1 - FEELER GAUGE
2 - OUTER GEAR
3 - PUMP BODY
Fig. 284 Measuring Outer Gear-to-Crescent
1 - FEELER GAUGE
2 - OUTER GEAR
3 - CRESCENT
4 - INNER GEAR
Fig. 285 Measuring Inner Gear-to-Crescent
1 - FEELER GAUGE
2 - OUTER GEAR
3 - CRESCENT
4 - INNER GEAR
21 - 262 41TE AUTOMATIC TRANSAXLERS
OIL PUMP (Continued)
Page 1724 of 2339

(8) Position an appropriate piece of Plastigage
across both pump gears.
(9) Align the Plastigage to a flat area on the reac-
tion shaft support housing.
(10) Install the reaction shaft to the pump housing
(Fig. 280). Tighten the bolts to 27 N´m (20 ft. lbs.).
(11) Remove bolts and carefully separate the hous-
ings. Measure the Plastigage following the instruc-
tions supplied.
(12) Clearance between both gear end faces and
the reaction shaft support should be 0.020-0.046 mm
(0.0008-0.0018 in.).
ASSEMBLY
(1) Assemble oil pump as shown in (Fig. 286).
(2) Install and torque reaction shaft support-to-oil
pump housing bolts to 28 N´m (20 ft. lbs.) torque
(Fig. 287).
PLANETARY GEARTRAIN
DESCRIPTION
The planetary geartrain is located between the
input clutch assembly and the rear of the transaxle
case. The planetary geartrain consists of two sun
gears, two planetary carriers, two annulus (ring)
gears, and one output shaft (Fig. 288).
OPERATION
The planetary geartrain utilizes two planetary gear
sets that connect the transmission input shaft to the
output shaft. Input and holding clutches drive or lock
different planetary members to change output ratio
or direction.
Fig. 286 Oil Pump Assembly
1 - PUMP BODY
2 - OUTER GEAR
3 - INNER GEAR
4 - REACTION SHAFT SUPPORT
5 - SEAL RINGS (4)
6 - REACTION SHAFT
7 - CRESCENT
Fig. 287 Reaction Support-to-Pump Body Bolts
1 - BOLT (6)
2 - PUMP BODY
3 - REACTION SHAFT SUPPORT
Fig. 288 Planetary Geartrain
1 - FRONT SUN GEAR ASSEMBLY
2 - #6 THRUST BEARING
3 - #7 THRUST BEARING
4 - REAR CARRIER/FRONT ANNULUS ASSEMBLY
5 - REAR SUN GEAR
6 - FRONT CARRIER/REAR ANNULUS ASSEMBLY
RS41TE AUTOMATIC TRANSAXLE21 - 263
OIL PUMP (Continued)
Page 1725 of 2339

SEAL - OIL PUMP
REMOVAL
(1) Remove transaxle from vehicle (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - 41TE
- REMOVAL).
(2) Using Tool C-3981-B, remove oil pump seal
(Fig. 289).
INSTALLATION
(1) Using Tool C-4193, install oil pump seal (Fig.
290).
(2) Install transaxle to vehicle (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - 41TE
- INSTALLATION).
SHIFT INTERLOCK SOLENOID
DESCRIPTION
The Brake/Transmission Shift Interlock system
consists of an electro-magnetic solenoid mounted to
the steering column (Fig. 291). The solenoid's plunger
consists of an integrated hook, which operates the
shift lever pawl (part of shift lever assembly), and a
plunger return spring (Fig. 292). The solenoid also
has an integrated bracket, which facilitates fastening
to the steering column.
Fig. 289 Remove Oil Pump Seal
1 - TOOL C-3981±B
2 - OIL PUMP SEAL
Fig. 290 Install Oil Pump Seal
1 - TOOL C-4193
2 - HANDLE TOOL C-4171
Fig. 291 Brake/Transmission Shift Interlock (BTSI)
Solenoid Location
1 - BTSI SOLENOID
Fig. 292 Solenoid Plunger and Return Spring
1 - PLUNGER
2 - RETURN SPRING
3 - BTSI SOLENOID
21 - 264 41TE AUTOMATIC TRANSAXLERS
Page 1726 of 2339

OPERATION
The Brake/Transmission Shift Interlock (BTSI)
Solenoid prevents the transmission shift lever from
being moved out of PARK (P) unless the brake pedal
is applied. The BTSI solenoid is hardwired to and
controlled by the Intelligent Power Module (IPM).
Battery voltage is applied to one side of the solenoid
with the ignition key is in either the OFF, ON/RUN,
or START positions (Fig. 293). The ground side of the
solenoid is controlled by a driver within the IPM. It
relies on voltage supplied from the stop lamp switch
to the stop lamp sense circuit within the IPM to tell
when the brake pedal is depressed. When the brake
pedal is depressed, the ground circuit opens, de-ener-
gizing the solenoid. When the brake pedal is
released, the ground circuit is closed, energizing the
solenoid.
When the ignition key is in either the OFF,
ON/RUN, or START positions, the BTSI solenoid is
energized, and the solenoid plunger hook pulls the
shift lever pawl into position, prohibiting the shift
lever from moving out of PARK (P) (Fig. 294). When
the brake pedal is depressed, the ground circuit
opens, de-energizing the solenoid. This moves the
gearshift lever pawl out of the way (Fig. 295), allow-
ing the shift lever to be moved into any gear position.
Fig. 293 Ignition Key/Switch Positions
1 - ACC
2 - LOCK
3 - OFF
4 - ON/RUN
5-START
Fig. 294 Pawl Engaged to Shift Lever
1 - GEAR SHIFT LEVER
2 - GEAR SHIFT LEVER PAWL
Fig. 295 Pawl Disengaged From Shift Lever
1 - GEAR SHIFT LEVER
2 - GEAR SHIFT LEVER PAWL
RS41TE AUTOMATIC TRANSAXLE21 - 265
SHIFT INTERLOCK SOLENOID (Continued)
Page 1727 of 2339

A conventional mechanical interlock system is also
used. This system manually prohibits shifter move-
ment when the ignition switch is in the LOCK or
ACC positions. Solenoid operation is not required in
these key positions.
For intended BTSI system operation, refer to the
following chart:
ACTION EXPECTED RESPONSE
1. Turn key to the9OFF9
position.1. Shifter CAN be shifted
out of park with brake
pedal applied.
2. Turn key to the
9ON/RUN9position.2. Shifter CANNOT be
shifted out of park.
3. Turn key to the
9ON/RUN9position and
depress the brake pedal.3. Shifter CAN be shifted
out of park.
4. Leave shifter in any
gear and try to return key
to the9LOCK9or9ACC9
position.4. Key cannot be
returned to the9LOCK9or
9ACC9position.
5. Return shifter to
9PARK9and try to remove
the key.5. Key can be removed
(after returning to9LOCK9
position).
6. With the key removed,
try to shift out of9PARK9.6. Shifter cannot be
shifted out of9PARK9.
NOTE: Any failure to meet these expected
responses requires system adjustment or repair.
DIAGNOSIS AND TESTING - BRAKE/
TRANSMISSION SHIFT INTERLOCK SOLENOID
For intended BTSI system operation, refer to the
following chart:
ACTION EXPECTED RESPONSE
1. Turn key to the9OFF9
position.1. Shifter CAN be shifted
out of park with brake
pedal applied.
2. Turn key to the
9ON/RUN9position.2. Shifter CANNOT be
shifted out of park.
3. Turn key to the
9ON/RUN9position and
depress the brake pedal.3. Shifter CAN be shifted
out of park.
4. Leave shifter in any
gear and try to return key
to the9LOCK9or9ACC9
position.4. Key cannot be
returned to the9LOCK9or
9ACC9position.
5. Return shifter to
9PARK9and try to remove
the key.5. Key can be removed
(after returning to9LOCK9
position).
ACTION EXPECTED RESPONSE
6. With the key removed,
try to shift out of9PARK9.6. Shifter cannot be
shifted out of9PARK9.
NOTE: Any failure to meet these expected
responses requires system repair. Refer to the
appropriate Diagnostic Information.
REMOVAL
(1) Disconnect battery negative cable.
(2) Remove instrument panel lower shroud (Fig.
296).
(3) Remove knee bolster (Fig. 297).
Fig. 296 Instrument Panel Lower Silencer
1 - INSTRUMENT PANEL LOWER SILENCER
Fig. 297 Knee Bolster
1 - KNEE BOLSTER
21 - 266 41TE AUTOMATIC TRANSAXLERS
SHIFT INTERLOCK SOLENOID (Continued)
Page 1728 of 2339
(4) Remove steering column lower shroud.
(5) Disconnect brake/transmission shift interlock
(BTSI) solenoid connector (Fig. 298).
(6) Remove two (2) solenoid-to-column screws (Fig.
299).
(7) Remove solenoid.INSTALLATION
(1) Place interlock solenoid into position ensuring
hook on end of solenoid plunger engages gearshift
lever pawl pin. Install and tighten screws (Fig. 300).
(2) Verify gearshift lever is in PARK (P) and con-
nect solenoid connector (Fig. 301).
Fig. 298 BTSI Solenoid Connector
1 - BTSI SOLENOID
2 - SOLENOID CONNECTOR
Fig. 299 Solenoid Retaining Screw
1 - SOLENOID RETAINING SCREW (2)
Fig. 300 Solenoid Retaining Screw
1 - SOLENOID RETAINING SCREW (2)
Fig. 301 BTSI Solenoid Connector
1 - BTSI SOLENOID
2 - SOLENOID CONNECTOR
RS41TE AUTOMATIC TRANSAXLE21 - 267
SHIFT INTERLOCK SOLENOID (Continued)