Throttle Position Sensor

The TPS is mounted on the throttle body and converts the throttle valve angle into an electrical signal. As the throttle opens, the signal voltage increases.

The ECM uses throttle valve position information to know:

• engine mode: idle, part throttle, wide open throttle.

• switch off AC and emission controls at Wide Open Throttle (WOT).

• air-fuel ratio correction.

• power increase correction.

The basic TPS requires three wires. Five volts are supplied to the TPS from the VC terminal of the ECM. The TPS voltage signal is supplied to the VTA terminal. A ground wire from the TPS to the E2 terminal of the ECM completes the circuit.

At idle, voltage is approximately 0.6 - 0.9 volts on the signal wire. From this voltage, the ECM knows the throttle plate is closed. At wide open throttle, signal voltage is approximately 3.5 - 4.7 volts.

Inside the TPS is a resistor and a wiper arm. The arm is always contacting the resistor. At the point of contact, the available voltage is the signal voltage and this indicates throttle valve position. At idle, the resistance between the VC (or VCC terminal and VTA terminal is high, therefore, the available voltage is approximately 0.6 - 0.9 volts. As the contact arm moves closer the VC terminal (the 5 volt power voltage), resistance decreases and the voltage signal increases.

Rav4 Throttle Position Sensor Measure

Some TPS incorporate a Closed Throttle Position switch (also called an idle contact switch). This switch is closed when the throttle valve is closed. At this point, the ECM measures 0 volts and there is 0 volts at the IDL terminal. When the throttle is opened, the switch opens and the ECM reads +B voltage at the IDL circuit.

TPS in the ETCS-i System

Throttle Position Sensor

Throttle Position Sensor

Toyota 1kz Accelerator Sensor

T852Í054

The TPS on the ETCS-i system has two contact arms and to resistors in one housing. The first signal line is VTA1 and the second signal line is VTA2.

Tps Signal Voltage

VTA2 works the same, but starts at a higher voltage output and the voltage change rate is different from VTA1 As the throttle opens the two voltage signals increase at a different rate. The ECM uses both signals to detect the change in throttle valve position. By having two sensors, ECM can compare the voltages and detect problems.

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Responses

  • Sirkka
    What is the correct voltage for toyota corolla tps 5A?
    1 year ago
  • crispino
    Where is throttle body sensor on 2006 toyota corolla with 1.liter. engine?
    1 year ago
  • umberto
    How to train electronic throttle body idle position 2005 toyota 4runner?
    10 months ago
  • birikti
    How to ajust the throttle sensor on a 2005 Toyota Corolla?
    9 months ago
  • harold
    How to change idle control valve on 2002 toyota rav 4?
    7 months ago
  • Claudia Greece
    Where to lochte toyota yaris Motor Sensors?
    7 months ago
  • John
    How a throtle body of a rav4 works?
    7 months ago
  • mario
    How to change throttle position sensor in 2002 toyota sequoia?
    7 months ago
  • Johanna
    How 5a engine throttle should be installed?
    5 months ago
  • Massawa Aman
    How to change throttle valve on a Toyota 5A engine?
    3 months ago
  • Safa
    How to repair throttle sensor 2001 rav4?
    3 months ago

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