The Throttle Position (TP) sensor is a potentiometer that provides a signal to the PCM that is directly proportional to the throttle plate position. The TP sensor is mounted on the side of the throttle body and is connected to the throttle plate shaft.
The TP senses the throttle movement and position and transmits an appropriate electrical signal to the PCM. These signals are used by the PCM to adjust the air/fuel mixture, spark timing and EGR operation according to engine load at idle, part throttle, or full throttle. The TP sensor has 2 versions, an adjustable and a non-adjustable; the difference being elongated mounting holes that allow the rotary sensor to be turned slightly to adjust the output voltage. The rotary TP sensor with round mounting holes are not adjustable.
With ignition F , disconnect the TP sensor connector. Measure resistance between sensor connector terminals SIG RTN and TP. If resistance readings are about equal to the values in the tables, the sensor is okay.
REMOVAL & INSTALLATION
See Figures 1, 2 and 3
- Disconnect the TP sensor wiring harness.
- On 5.0L and 5.8L engines, it may be necessary to remove the throttle body. On all other engines proceed to the next step.
- Disconnect the wiring from the sensor.
- Matchmark the TP sensor and throttle body. Remove the 2 retaining screws and the sensor.
- On 5.0L and 5.8L engines, position the TP sensor so that the pigtail points toward the IAC valve.
- Secure the TP sensor to the throttle body with the retaining screws. Tighten to 18-27 inch lbs. (2-3 Nm) on 4.9L engines or 11-16 inch lbs. (1.2-1.8 Nm) on 5.0L/5.8L engines.
- If applicable, install the throttle body.
- Connect the wiring.
- Connect the negative battery cable.