Transmission Solenoid Testing; Switch Testing; Testing Transmission Valve Body Solenoid; Park/Neutral Position Switch - Jeep 200 Cherokee Service Manual

XJ
DIAGNOSIS AND TESTING (Continued)
CONDITION
OVERHEAT DURING
COMMERCIAL OPERATION OR
WHILE TRAILE TOWING (FLUID
DARK AND BURNED WITH SOME
SLUDGE FORMATION)
OIL COMES OUT FILLER TUBE

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).
POSSIBLE CAUSE
Vehicle not properly equipped for
trailer towing or commercial use
Vehicle not equipped with auxiliary
fluid cooler
Extensive idling time or operation in
heavy traffic in hot weather
Tow vehicle overloaded (exceeding
vehicle tow capacity
Air flow to auxiliary cooler blocked
by snow plow, front mounted spare
tire, bug screen, or similar item
Transmission overfilled
Breather vent in oil pump blocked
Fluid cooler or cooler lines plugged
Fig. 40 Testing Transmission Valve Body Solenoid
1 – OHMMETER
2 – WIRE TERMINAL
3 – SOLENOID
• Continuity should not exist in D position.
AW–4 AUTOMATIC TRANSMISSION
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
Drain fluid, change filter, and install
auxiliary cooler
Cut down on idling time; shift into
neutral every so often and run
engine at 1000 rpm to help circulate
fluid through cooler
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
Remove or reposition item causing
air flow blockage
Drain fluid to correct level; remove
neutral switch and drain through
switch hole with suction gun
Inspect and clear blockage
Flush cooler and lines
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CORRECTION