Jeep Wrangler TJ. Manual — part 470
4.0L
CAUTION: Be careful not to damage or kink the
cable core wire (within the cable sheathing) while
servicing accelerator pedal or throttle cable.
(1) From inside vehicle, hold up accelerator pedal.
Remove plastic cable retainer (clip) and throttle cable
core wire from upper end of accelerator pedal arm
(Fig. 29). Plastic cable retainer (clip) snaps into pedal
arm.
(2) Remove cable core wire at pedal arm.
(3) From inside vehicle, pinch both sides of cable
housing retainer tabs (Fig. 29) at dash panel.
Remove cable housing from dash panel and pull into
engine compartment.
(4) Remove cable from clip guides on engine cylin-
der head (valve) cover (Fig. 30).
(5) Remove throttle cable ball socket at throttle
body by pushing ball socket towards rear of vehicle
(ball snaps off of throttle body pin) (Fig. 31).
(6) Remove
throttle
cable
from
throttle
body
mounting bracket by compressing release tabs (Fig.
31) and pushing cable through hole in bracket.
(7) Remove throttle cable from vehicle.
Fig. 29 ACCELERATOR PEDAL MOUNTING
1 - CABLE RETAINER
2 - SLOT
3 - MOUNTING STUDS (2)
4 - PEDAL/BRACKET ASSEMBLY
5 - MOUNTING STUDS
6 - RETAINER TABS
7 - CABLE
8 - CABLE STOP
Fig. 30 THROTTLE CABLE ROUTING - 4.0L
1 - THROTTLE CABLE
2 - GUIDE
Fig. 31 THROTTLE CABLE AT THROTTLE BODY -
4.0L - TYPICAL
1 - ACCELERATOR CABLE
2 - OFF
3 - OFF
4 - THROTTLE BODY BELLCRANK
5 - SPEED CONTROL CABLE
6 - RELEASE TABS
7 - BRACKET
TJ
FUEL INJECTION
14 - 39
THROTTLE CONTROL CABLE (Continued)
INSTALLATION
2.4L
(1) Slide accelerator cable plastic mount into throt-
tle body mounting bracket. Continue sliding until
release tab is aligned to hole in mounting bracket.
(2) Hold throttle in wide open position. While held
in this position, slide throttle cable pin into throttle
body bellcrank.
(3) Push cable housing into rubber grommet and
through opening in dash panel.
(4) Push other end of cable through opening in
dash panel until retaining tabs lock into panel.
(5) From inside vehicle, slide throttle cable core
wire into opening (slot) in top of pedal arm.
(6) Push plastic cable retainer (clip) into pedal arm
opening until it snaps in place.
(7) Install air box to throttle body.
(8) Before
starting
engine,
operate
accelerator
pedal to check for any binding.
4.0L
(1) Slide throttle cable through hole in throttle
body bracket until retainer tabs lock into bracket.
Connect cable ball end to throttle body linkage ball
(snaps on).
(2) Snap cable into clip guides on engine cylinder
head (valve) cover.
(3) Push other end of cable through opening in
dash panel until retaining tabs lock into panel.
(4) From inside drivers compartment, slide throttle
cable core wire into opening in top of accelerator
pedal arm. An index tab is located on pedal arm.
Rotate and push cable retainer (clip) into pedal arm
opening until it snaps in place on index tab.
(5) Install air box to throttle body.
(6) Before
starting
engine,
operate
accelerator
pedal to check for any binding.
THROTTLE POSITION SENSOR
DESCRIPTION
The 3–wire Throttle Position Sensor (TPS) is
mounted on the throttle body and is connected to the
throttle blade.
OPERATION
The TPS is a 3–wire variable resistor that provides
the Powertrain Control Module (PCM) with an input
signal (voltage) that represents the throttle blade
position of the throttle body. The sensor is connected
to the throttle blade shaft. As the position of the
throttle blade changes, the resistance (output volt-
age) of the TPS changes.
The PCM supplies approximately 5 volts to the
TPS. The TPS output voltage (input signal to the
PCM) represents the throttle blade position. The
PCM receives an input signal voltage from the TPS.
This will vary in an approximate range of from .26
volts at minimum throttle opening (idle), to 4.49 volts
at wide open throttle. Along with inputs from other
sensors, the PCM uses the TPS input to determine
current engine operating conditions. In response to
engine operating conditions, the PCM will adjust fuel
injector pulse width and ignition timing.
The PCM needs to identify the actions and position
of the throttle blade at all times. This information is
needed to assist in performing the following calcula-
tions:
• Ignition timing advance
• Fuel injection pulse-width
• Idle (learned value or minimum TPS)
• Off-idle (0.06 volt)
• Wide Open Throttle (WOT) open loop (2.608
volts above learned idle voltage)
• Deceleration fuel lean out
• Fuel cutoff during cranking at WOT (2.608 volts
above learned idle voltage)
• A/C WOT cutoff (certain automatic transmis-
sions only)
REMOVAL
2.4L
The Throttle Position Sensor (TPS) is mounted to
the throttle body (Fig. 32).
(1) Disconnect TPS electrical connector.
(2) Remove 2 TPS mounting screws.
(3) Remove TPS.
4.0L
The TPS is mounted to the throttle body.
(1) Remove air cleaner tube at throttle body.
(2) Disconnect TPS electrical connector.
(3) Remove TPS mounting screws (Fig. 33).
(4) Remove TPS.
14 - 40
FUEL INJECTION
TJ
THROTTLE CONTROL CABLE (Continued)
INSTALLATION
2.4L
The throttle shaft end of the throttle body slides
into a socket in the TPS. The TPS must be installed
so that it can be rotated a few degrees. (If sensor will
not rotate, install sensor with throttle shaft on other
side of socket tangs). The TPS will be under slight
tension when rotated.
(1) Install TPS and retaining screws.
(2) Tighten screws to 7 N·m (60 in. lbs.) torque.
(3) Connect TPS electrical connector to TPS.
(4) Manually operate throttle (by hand) to check
for any TPS binding before starting engine.
(5) Install air cleaner tube to throttle body.
4.0L
The throttle shaft end of the throttle body slides
into a socket in the TPS (Fig. 34). The TPS must be
installed so that it can be rotated a few degrees. (If
the sensor will not rotate, install the sensor with the
throttle shaft on the other side of the socket tangs).
The TPS will be under slight tension when rotated.
(1) Install TPS and retaining screws.
(2) Tighten screws to 7 N·m (60 in. lbs.) torque.
(3) Connect TPS electrical connector to TPS.
(4) Manually operate throttle (by hand) to check
for any TPS binding before starting engine.
(5) Install air cleaner tube to throttle body.
Fig. 32 TPS/IAC MOTOR - 2.4L
1 - THROTTLE POSITION SENSOR (TPS)
2 - MOUNTING SCREWS
3 - IDLE AIR CONTROL MOTOR (IAC)
4 - MOUNTING SCREWS
Fig. 33 TPS MOUNTING SCREWS - 4.0L
1 - MOUNTING SCREWS
2 - TPS
Fig. 34 TPS INSTALLATION - 4.0L
1 - TANGS
2 - THROTTLE SHAFT
3 - THROTTLE BODY
4 - TPS
TJ
FUEL INJECTION
14 - 41
THROTTLE POSITION SENSOR (Continued)
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