Throttle Position sensor

[rangerdale]

Does anyone know how to test this sensor on a 1998 2.5 engine?

 

[Zer0PSI]

A sensor can be tested with a voltmeter while its electrical wiring is still connected (this is called backprobing a connector). Move the throttle slowly from closed to open. At different throttle openings, varying resistances are specified. Watch for any glitches.

With the ignition switch on, connect a voltmeter between the reference wire to ground.
Normally, the voltage reading should be approximately 5 volts.
If the reference wire is not supplying the specified voltage, check the voltage on this wire at the computer terminal.
If the voltage is within specifications at the computer, but low at the sensor, repair the reference wire.
When this voltage is low at the computer, check the voltage supply wires and ground wires on the computer.
If these wires are satisfactory, replace the computer.
With the ignition switch on, connect the voltmeter from the sensor ground wire to the battery ground.
If the voltage drop across this circuit exceeds specifications, repair the ground wire from the sensor to the computer.

NOTE
When the throttle is opened gradually to check the throttle position sensor voltage signal, tap the sensor lightly and watch for fluctuations on the voltmeter pointer, indicating a defective sensor.


With the ignition switch on, connect a voltmeter from the sensor signal wire to ground.
Slowly open the throttle and observe the voltmeter.
The voltmeter reading should increase smoothly and gradually.
Typical TP sensor voltage readings would be 0.5 volt to 1 volt with the throttle in the idle position, and 4 to 5 volts at wide-open throttle.
If the TP sensor does not have the specified voltage or if the voltage signal is erratic, replace the sensor.

 

[rangerdale]

Thanks a bunch ZerOPSI! I've accomplished the test and it working.