Jeep Cherokee 2000, Service Manual

Page: 1153 / 1528

CONDITION POSSIBLE CAUSE CORRECTION
OVERHEAT DURING
COMMERCIAL OPERATION OR
WHILE TRAILE TOWING (FLUID
DARK AND BURNED WITH SOME
SLUDGE FORMATION) Vehicle not properly equipped for
trailer towing or commercial use Be sure vehicle is equipped with
recommended optional components
(i.e. HD springs, transmission, axle,
larger CID engine, auxiliary cooler,
correct axle ratio, etc.). If vehicle is
not so equipped, it should not be
used for severe service operation
Vehicle not equipped with auxiliary
fluid cooler Drain fluid, change filter, and install
auxiliary cooler
Extensive idling time or operation in
heavy traffic in hot weather Cut down on idling time; shift into
neutral every so often and run
engine at 1000 rpm to help circulate
fluid through cooler
Tow vehicle overloaded (exceeding
vehicle tow capacity Be sure vehicle is properly equipped
to handle load; do not tow Class
III-type loads with a vehicle that is
only rated for Class I or II operation
Air flow to auxiliary cooler blocked
by snow plow, front mounted spare
tire, bug screen, or similar item Remove or reposition item causing
air flow blockage
OIL COMES OUT FILLER TUBE Transmission overfilled Drain fluid to correct level; remove
neutral switch and drain through
switch hole with suction gun
Breather vent in oil pump blocked Inspect and clear blockage
Fluid cooler or cooler lines plugged Flush cooler and lines
TRANSMISSION SOLENOID TESTING
Test solenoid resistance with an ohmmeter. Con-
nect the ohmmeter leads to the solenoid mounting
bracket and to the solenoid wire terminal (Fig. 40).
Solenoid resistance should be 11–15 ohms. Replace
the solenoid if resistance is above or below the spec-
ified range.
PARK/NEUTRAL POSITION SWITCH
SWITCH TESTING
Test switch continuity with an ohmmeter. Discon-
nect the switch and check continuity at the connector
terminal positions and in the gear ranges indicated
in Figure 3. Switch continuity should be as follows:
•
Continuity should exist between terminals B
and C with the transmission in Park and Neutral
only (Fig. 41).
•
Continuity should exist between terminals A and
E with the transmission in Reverse (Fig. 41).
•
Continuity should exist between terminals A and
G with the transmission in third gear (Fig. 41).
•
Continuity should exist between terminals A and
H with the transmission in first and/or second gear
(Fig. 41).
•
Continuity should not exist in D position.
Fig. 40 Testing Transmission Valve Body Solenoid
1 – OHMMETER
2 – WIRE TERMINAL
3 – SOLENOID
XJ
AW–4 AUTOMATIC TRANSMISSION 21 - 245
DIAGNOSIS AND TESTING (Continued)