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