Jeep Cherokee
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Fuel system » Fuel injection system » Description and operation
Throttle position sensor (tps)-pcm input


The 3-wire Throttle Position Sensor (TPS) is mounted on the throttle body and is connected to the throttle blade.


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 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.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)
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    Intake manifold air temperature sensor-pcm input

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    Oil pressure sensor-pcm input

    Power grounds

    Power steering pressure switch- pcm input

    Sensor return-pcm input

    Throttle position sensor (tps)-pcm input

    Vehicle speed and distance sensor- pcm input

    Auto shutdown (asd) relay-pcm output

    CCD bus (+/-) circuits-pcm outputs

    Data link connector-pcm input and output

    Fuel injectors-pcm output

    Fuel pump relay-pcm output

    Idle air control (iac) motor-pcm output

    Radiator fan relay-pcm output

    Throttle body

    Jeep Cherokee Service Manual / Fuel system / Fuel injection system / Description and operation / Throttle position sensor (tps)-pcm input

    Jeep Cherokee Service Manual


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