Friday, June 24, 2011

How to test TPS sensor?

  • Unplug the TPS electrical connector. Turn on the ignition switch, but do not start the engine. Using a voltmeter, probe the connector’s terminals coming from the computer side to test for supply voltage. Touch the negative lead to the connector’s terminal ground--most likely the black wire--and the meter’s positive or red lead to the connector’s terminal reference voltage wire, a blue or gray color wire. Your meter should read a steady 5.0 volts at the terminal. If you don’t receive this voltage reading, there is an open or short in the supply wire. Turn off the ignition switch and plug the electrical connector back to the TPS.

  • Test the TPS for signal voltage to the computer. Insert a pin through the ground wire and another pin through the signal voltage wire and connect the voltmeter probes to the pins using alligator clips. Start the engine. As you manually open and close the throttle plate, watch the voltage readings at the meter. The voltage should gradually increase from 1 to 5 volts and back to 1 volt. If you see erratic movement or no movement of voltage signal, replace the TPS. Turn off the engine.

  • Test the TPS’ resistance. This is an alternate method to test a TPS equipped with a variable resistor. Unplug the TPS electrical connection. Set your multimeter to ohms. Connect the ohmmeter probes to the sensor’s supply and signal wire contacts. Manually open and close the throttle plate and watch the resistance reading at the meter. The resistance should gradually increase and decrease as you open and close the throttle plate. If there is an erratic resistance change, no change, or no resistance at all, replace the TPS.


    But TPS sensor if checked good then the possibility for car not advancing on the acceleration

  • is low fuel pressure, timing problem, or worn out distributor.--------
    In your case timing and fuel pressure checked ok, so the distributor needs to be replaced.----------

    a lean condition could be a 02 sensor or low fuel pressure.

    you want to see 38-46 psi under full load and 28-36 at idle.


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    For car error code diagnosis click the link below:---

    http://www.automd.com/diagnose/?amdcid=apwldrbrd1

    Car no start:--

    http://technoanswers.blogspot.com/2011/05/car-will-turn-over-but-will-not-start.html

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