Jeep Liberty KJ. Manual — part 969
SENSOR-THROTTLE POSITION
DESCRIPTION
The 3-wire Throttle Position Sensor (TPS) is mounted on the throttle body and is connected to the throttle blade
shaft.
OPERATION
The 3-wire TPS 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 output voltage 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 0.26 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 calculations:
•
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 transmissions only)
REMOVAL
The Throttle Position Sensor (TPS) (1) is mounted to
the throttle body.
1. Disconnect TPS electrical connector.
2. Remove two TPS mounting screws (2).
3. Remove TPS.
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FUEL INJECTION - 3.7L GAS
KJ
INSTALLATION
The throttle shaft end of the throttle body (3) slides
into a socket (4) 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.
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FUEL INJECTION - 3.7L GAS
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FUEL INJECTION - 2.8L DIESEL
TABLE OF CONTENTS
page
page
ACCELERATOR PEDAL POSITION SENSOR
BOOST PRESSURE SENSOR
CAMSHAFT POSITION SENSOR
CRANKSHAFT POSITION SENSOR
FUEL INJECTOR
FUEL INJECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
STANDARD PROCEDURE
CLEANING FUEL INJECTORS . . . . . . . . . . . . . . 108
INJECTOR CLASSIFICATION . . . . . . . . . . . . . . . 109
FUEL PRESSURE SENSOR
FUEL PRESSURE SOLENOID
FUEL TEMPERATURE SENSOR
INTAKE AIR TEMPERATURE SENSOR
MASS AIR FLOW SENSOR
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FUEL INJECTION - 2.8L DIESEL
KJ
ACCELERATOR PEDAL POSITION SENSOR
DESCRIPTION
The Accelerator Pedal Position (APP) Sensor is a Hall Effect, angle of rotation sensor. The Accelerator Pedal Posi-
tion sensor is located inside the accelerator pedal assembly. A magnet located in the pedal shaft cylinder rotates
around a hall effect pick-up. The voltage signal increases as the accelerator pedal depresses. The APP sensor
receives a 5–volt reference signal from the ECM and based upon the position of the pedal shift magnet relative to
the windows on the Hall effect sensor, a portion of the 5 volts is returned to the ECM indicating pedal position.
REMOVAL
1. Disconnect negative battery cable.
2. Disconnect accelerator pedal position sensor elec-
trical connector.
3. Remove accelerator pedal position sensor assem-
bly mounting bolts.
4. Open accelerator pedal position sensor assembly
and disconnect accelerator cable.
5. Remove
accelerator
pedal
position
sensor
assembly.
INSTALLATION
Position the APP sensor and install the fasteners hand
tight.
1. Tighten the APP sensor fasteners to 10.8N·m (96
in. lbs.).
2. Connect the APP sensor wiring harness connector.
3. Connect negative battery cable.
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FUEL INJECTION - 2.8L DIESEL
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