The throttle position sensor mounts to the side of the throttle body. The Throttle Position Sensor (TPS) connects to the throttle blade shaft. The TPS is a variable resistor that provides the PCM with an input signal (voltage). The signal represents throttle blade position. As the position of the throttle blade changes, the resistance of the TPS changes.
The PCM supplies approximately 5 volts DC to the TPS. The TPS output voltage (input signal to the powertrain control module) represents throttle blade position. The TPS output voltage to the PCM varies from approximately 0.35 to 1.03 volts at minimum throttle opening (idle) to a maximum of 3.1 to 4.0 volts at wide-open throttle.
Along with inputs from other sensors, the PCM uses the TPS input to determine current engine operating conditions. The PCM also adjusts fuel injector pulse width and ignition timing based on these inputs. When the TPS indicates a voltage that is too high, too low or not believable, the PCM sets a DTC. When the DTC is set, the MIL is illuminated and the PCM moves into limp-in mode. Limp-in for the TPS is divided into three categories:
Removal & Installation
- Disconnect the negative battery cable.
- Loosen the clamp for the air duct at the throttle body.
- Remove the mounting bolt and nut for the air cleaner box.
- Pull the air cleaner box and throttle body up to access the throttle position sensor.
- Remove the throttle position sensor.
- Install the throttle position
- Locate the air cleaner box and throttle body and tighten the mounting bolt and nut.
- Install the air duet hose and tighten the clamp.
- Connect the negative battery cable.