Diagnosis And Testing - Part Time Indicator; Diagnosis And Testing - Full Time Indicator; Indicator Does Not Illuminate With Part Time Mode Selected; Indicator Stays Illuminated With Part Time Mode Not Selected - Jeep Wrangler 2001 Service Manual

TJ
SHIFT INDICATOR (TRANSFER CASE) (Continued)
information on the transfer case switch. For further
diagnosis of the part time indicator or the instrument
cluster circuitry that controls the LED, (Refer to 8 -
ELECTRICAL/INSTRUMENT CLUSTER - DIAGNO-
SIS AND TESTING).
DIAGNOSIS AND TESTING - PART TIME
INDICATOR
The diagnosis found here addresses an inoperative
part time indicator condition. Before beginning this
test, confirm the functionality of the part time indi-
cator Light Emitting Diode (LED) and the cluster
control circuitry by performing the instrument clus-
ter actuator test. (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER
TESTING). If the part time indicator fails to illumi-
nate during the actuator test, replace the faulty
instrument cluster. If the problem being diagnosed is
related to indicator accuracy, be certain to confirm
that the problem is with the indicator or transfer
case switch and not a mechanical malfunction of the
transfer case or transfer case shift linkage. (Refer to
21 - TRANSMISSION/TRANSAXLE/TRANSFER
CASE - DIAGNOSIS AND TESTING). If no transfer
case problem is found, the following procedure will
help to locate a short or open in the 4WD switch
sense (part time) circuit. Refer to the appropriate
wiring information. The wiring information includes
wiring diagrams, proper wire and connector repair
procedures, details of wire harness routing and
retention, connector pin-out information and location
views for the various wire harness connectors, splices
and grounds.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
INDICATOR DOES NOT ILLUMINATE WITH PART TIME MODE
SELECTED
(1) Disconnect and isolate the battery negative
cable. Disconnect the engine wire harness connector
for the transfer case switch from the transfer case
switch connector receptacle. Check for continuity
between the ground circuit cavity of the engine wire
2001 JEEP WRANGLER
- DIAGNOSIS AND
INSTRUMENT CLUSTER
harness connector for the transfer case switch and a
good ground. There should be continuity. If OK, go to
Step 2. If not OK, repair the open ground circuit to
ground (G105) as required.
(2) Reconnect the battery negative cable. Turn the
ignition switch to the On position. Install a jumper
wire between the 4WD switch sense (part-time) cir-
cuit cavity of the engine wire harness connector for
the transfer case switch and a good ground. The part
time indicator should light. If OK, replace the faulty
transfer case switch. If not OK, go to Step 3.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the instrument cluster from the instrument
panel. Disconnect the instrument panel wire harness
connector (Connector C2) for the instrument cluster
from the connector receptacle on the back of the clus-
ter housing. Check for continuity between the 4WD
switch sense (part-time) circuit cavities of the instru-
ment panel wire harness connector (Connector C2)
for the instrument cluster and the engine wire har-
ness connector for the transfer case switch. There
should be continuity. If OK, replace the faulty instru-
ment cluster. If not OK, repair the open 4WD switch
sense (part-time) circuit between the instrument
cluster and the transfer case switch as required.
INDICATOR STAYS ILLUMINATED WITH PART TIME MODE
NOT SELECTED
(1) Disconnect and isolate the battery negative
cable. Disconnect the engine wire harness connector
for the transfer case switch from the transfer case
switch connector receptacle. Check for continuity
between the ground circuit and the 4WD switch
sense (part-time) circuit terminals in the transfer
case switch connector receptacle. There should be no
continuity. If OK, go to Step 2. If not OK, replace the
faulty transfer case switch.
(2) Remove the instrument cluster from the instru-
ment panel. Disconnect the instrument panel wire
harness connector (Connector C2) for the instrument
cluster from the connector receptacle on the back of
the cluster housing. Check for continuity between the
4WD switch sense (part-time) circuit cavity of the
instrument panel wire harness connector (Connector
C2) for the instrument cluster and a good ground.
There should be no continuity. If OK, replace the
faulty instrument cluster. If not OK, repair the
shorted 4WD switch sense (part-time) circuit between
the transfer case switch and the instrument cluster
as required.
DIAGNOSIS AND TESTING - FULL TIME
INDICATOR
The diagnosis found here addresses an inoperative
full time indicator condition. Before beginning this
8Js - 31