The Throttle Position (TP) sensor detects the throttle plate opening angle and supplies the PCM with an input signal indicating throttle position.
On 1991-95 1.8L engines with a manual transaxle, the TP sensor consists of a two-position switch sensing only closed or open throttle positions. These two positions are monitored by the Idle (IDL) switch and the Wide Open Throttle (WOT) switch.
On 1991-951.8L engines with automatic transaxles, the TP sensor consists of a combination switch and idle switch. The TP sensor sends a range of signals to the PCM indicating throttle plate position. This range of signals could range from idle to off idle.
On 1996 1.8L engines, the TP sensor consists of a combination switch and idle switch. The TP sensor sends a range of signals to the PCM indicating throttle plate position. This range of signals could range from idle to off idle.
On 1.9L and 2.0L engines, 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. As the TP sensor is rotated by the throttle shaft blade, the PCM receives information on the throttle plate position.
1.9L & 2.0L Engines
- Connect jumper wires from the sensor connector to the wiring harness. This permits the engine to operate normally while you check the sensor.
- Using the jumper wires, probe the TP terminal at the TP sensor connector, with the positive lead of a Digital Volt Ohmmeter (DVOM).
- Probe the SIG RTN terminal with the negative lead.
- 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 4.5 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.