Indicator Does Not Illuminate With Full Time Mode Selected; Indicator Stays Illuminated With Full Time Mode Not Selected; Speedometer Description - Jeep Wrangler 2001 Service Manual

8Js - 32 INSTRUMENT CLUSTER
SHIFT INDICATOR (TRANSFER CASE) (Continued)
test, confirm the functionality of the full time indica-
tor Light Emitting Diode (LED) and the cluster con-
trol circuitry by performing the instrument cluster
actuator test. (Refer to 8 - ELECTRICAL/INSTRU-
MENT CLUSTER - DIAGNOSIS AND TESTING). If
the full time indicator fails to illuminate 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 trans-
fer case shift linkage. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/TRANSFER
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 (full
time) circuit. Refer to the appropriate wiring infor-
mation. The wiring information includes wiring dia-
grams, proper wire and connector repair procedures,
details of wire harness routing and retention, connec-
tor 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 FULL 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
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 (full-time) circuit
cavity of the engine wire harness connector for the
transfer case switch and a good ground. The full time
indicator should light. If OK, replace the faulty
transfer case switch. If not OK, go to Step 3.
2001 JEEP WRANGLER
(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 (full-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-
CASE - ment cluster. If not OK, repair the open 4WD switch
sense (full-time) circuit between the instrument clus-
ter and the transfer case switch as required.
INDICATOR STAYS ILLUMINATED WITH FULL 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 (full-time) circuit terminals in the transfer case
switch connector receptacle. There should be no con-
tinuity. If OK, 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 (full-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 (full-time) circuit between
the transfer case switch and the instrument cluster
as required.
SPEEDOMETER
DESCRIPTION
A speedometer is standard equipment in all instru-
ment clusters. The speedometer is located next to the
tachometer, just to the right of center in the instru-
ment cluster. The speedometer consists of a movable
gauge needle or pointer controlled by the instrument
cluster electronic circuitry and a fixed 210 degree pri-
mary outer scale on the cluster overlay that reads
left-to-right either from 0 to 100 mph, from 0 to 110
mph, or from 0 to 180 km/h, depending upon the
requirements of the market for which the vehicle was
manufactured. Each version also has a secondary
inner scale on the cluster overlay that provides the
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