Installation; Throttle Position Sensor; Description; Operation - Chrysler Vehicle User Manual

TJ
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. 31).
(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. 32).
(4) Remove TPS.
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.
FUEL INJECTION 14 - 39