The Throttle Position (TP) sensor detects the throttle plate opening angle and supplies the PCM with an input signal indicating throttle position.
The TP sensor is a rotary potentiometer which consists of either a rigid or flexible thick film resistive substrate and a moving wiper that is mounted on a rotor.
See Figures 1, 2, 3 and 4
- Connect jumper wires from the sensor connector to the wiring harness. This permits the engine to operate normally while you check the sensor.
- Turn the ignition key OFF and wait for about ten seconds before conducting the test.
- Using the jumper wires, probe the VREF and SIG RTN terminals at the TP sensor connector, with a Digital Volt Ohmmeter (DVOM).
- The voltage should be between 4-6 volts.
- If the voltage is not within specification, check the VREF wiring and circuit.
- Probe the SIG RTN and TP terminals with the DVOM.
- Have an assistant turn the ignition key ON and depress the accelerator pedal in small smooth increments from the fully closed to the wide open position.
- Observe the voltmeter at each of these positions and note the voltage displayed.
- The voltage at the closed position should be approximately 0 volts. As the throttle is moved slowly through its travel, the voltage should rise evenly until you reach the fully open position, where the voltage should be approximately 5 volts.
- If the voltage does not meet specifications, or jumps around erratically when moving the throttle through its travel, the sensor may be defective and should be replaced.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Remove the air cleaner-to-intake manifold tube.
- Unplug the TP sensor electrical connection.
- Unfasten the sensor retaining screws and remove the sensor.
- Place the sensor on the throttle body. Make sure the tangs on the sensor are properly aligned and the wires are pointing down.
The TP sensor is not adjustable.
- Install and tighten the sensor retainers to 25-30 inch lbs. (2.8-3.4 Nm).
- Attach the TP sensor electrical connection.
- Install the air cleaner-to-intake manifold tube.
- Connect the negative battery cable.