Jeep Grand Cherokee WK. Manual — part 1513
downshifting by tipping the lever towards the left-hand side is recommended. If this has been done, subse-
quent upshifting must be carried out manually as well.
•
Tipping the selector lever toward
(
-
(
and holding it in this position: The currently engaged gear in range
9
D
9
is indicated in the instrument cluster display and the shift range is limited to this gear.
•
Tipping the selector lever toward
(
+
(
one time after another: The shift range is increased by one gear each
time and the increased shift range is displayed in the instrument cluster; possibly, the transmission upshifts to
a faster gear.
•
Tipping the selector lever toward
(
+
(
several times: The shift range is increased by one gear each time the
lever is tipped until the shift range ends up in
9
D
9
.
•
Tipping the selector lever toward
(
+
(
and holding it in this position: The shift range is extended immedi-
ately to
9
D
9
, shift ranges are indicated in ascending sequence; possibly, the transmission upshifts to a faster
gear due to the extension of the shift range.
REMOVAL
1. Remove any necessary console parts for access to
shift lever assembly and shifter cables. (Refer to 23
-
BODY/INTERIOR/FLOOR
CONSOLE
-
REMOVAL)
2. If necessary, remove the bolts holding the shield,
covering the gearshift and park lock cables, to the
shifter assembly and remove the shield.
3. Shift transmission into PARK.
4. Disconnect the transmission shift cable (3) at shift
lever (1).
5. Remove the shift cable retainer (4) from the notch
in the shifter assembly.
6. Verify the key is in the LOCK position and discon-
nect the park lock cable (5) from the shifter
mechansim cam and the notch in the shifter
assembly.
7. Disengage all wiring connectors (2, 3) from the
shifter assembly (1).
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8. Remove all bolts (2) holding the shifter assembly
(1) to the floor pan.
9. Remove the shifter assembly (1) from the vehicle.
INSTALLATION
1. Install shifter assembly (1) in position on the floor
pan.
2. Install the bolts (2) to hold the shifter assembly (1)
onto the floor pan. Tighten bolts to 12 N·m (105
in.lbs.).
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3. Place the floor shifter lever in PARK position.
4. Loosen the adjustment nut (2) on the shifter
assembly (1).
5. Install the gearshift cable (3) to the shift lever pin.
6. Install the park lock cable (5) to the shift mecha-
nism cam and the notch in the shifter assembly.
7. Verify that the key is in the LOCK position and
remains there until the cable is fully adjusted.
8. Verify that the park lock cable adjustment tab is
pulled upward to the unlocked position.
9. Install the wiring harness connectors (2) to the
shifter assembly (1).
10. Verify that the shift lever is in the PARK position.
11. Tighten the adjustment screw to 30 N·m (265
in.lbs.).
12. Verify that the key in the LOCK position and the
shifter is in PARK.
13. Push downward on the park lock cable adjust-
ment tab to lock the adjustment.
14. Verify correct shifter, park lock, and BTSI opera-
tion.
15. If necessary, install the shield, covering the gear-
shift and park lock cables, to the shifter assembly
and install the bolts to hold the shield to the
shifter assembly.
16. Install any console parts removed for access to
shift lever assembly and shift cables. (Refer to 23
- BODY/INTERIOR/FLOOR CONSOLE - INSTAL-
LATION)
SOLENOID
DESCRIPTION
The typical electrical solenoid used in automotive applications is a linear actuator. It is a device that produces
motion in a straight line. This straight line motion can be either forward or backward in direction, and short or long
distance.
A solenoid is an electromechanical device that uses a magnetic force to perform work. It consists of a coil of wire,
wrapped around a magnetic core made from steel or iron, and a spring loaded, movable plunger, which performs
the work, or straight line motion.
The solenoids used in transmission applications are attached to valves which can be classified as normally open
or normally closed. The normally open solenoid valve is defined as a valve which allows hydraulic flow when no
current or voltage is applied to the solenoid. The normally closed solenoid valve is defined as a valve which does
not allow hydraulic flow when no current or voltage is applied to the solenoid. These valves perform hydraulic con-
trol functions for the transmission and must therefore be durable and tolerant of dirt particles. For these reasons, the
valves have hardened steel poppets and ball valves. The solenoids operate the valves directly, which means that
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the solenoids must have very high outputs to close the valves against the sizable flow areas and line pressures
found in current transmissions. Fast response time is also necessary to ensure accurate control of the transmission.
The strength of the magnetic field is the primary force that determines the speed of operation in a particular sole-
noid design. A stronger magnetic field will cause the plunger to move at a greater speed than a weaker one. There
are basically two ways to increase the force of the magnetic field:
1. Increase the amount of current applied to the coil or
2. Increase the number of turns of wire in the coil.
The most common practice is to increase the number of turns by using thin wire that can completely fill the available
space within the solenoid housing. The strength of the spring and the length of the plunger also contribute to the
response speed possible by a particular solenoid design.
A solenoid can also be described by the method by which it is controlled. Some of the possibilities include variable
force, pulse-width modulated, constant ON, or duty cycle. The variable force and pulse-width modulated versions
utilize similar methods to control the current flow through the solenoid to position the solenoid plunger at a desired
position somewhere between full ON and full OFF. The constant ON and duty cycled versions control the voltage
across the solenoid to allow either full flow or no flow through the solenoid’s valve.
UPSHIFT/DOWNSHIFT SOLENOID VALVES
The solenoid valves (1) for upshifts and downshifts
are located in the shell of the electric control unit and
pressed against the shift plate with a spring.
The solenoid valves (1) initiate the upshift and down-
shift procedures in the shift plate.
The solenoid valves (1) are sealed off from the valve
housing of the shift plate (5) by two O-rings (4, 6). The
contact springs (8) at the solenoid valve engage in a
slot in the conductor tracks (7). The force of the con-
tact spring (8) ensures safe contacts.
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