Parts for your 2009 Toyota Vitz|yaris-Throttle position sensors

2009 Toyota Vitz/Yaris Throttle Position Sensor (TPS) – What it does and how to look after it

On the 2009 Toyota Vitz/Yaris (XP90), a throttle position sensor is absolutely used. Toyota’s own service literature describes an electronic throttle body with an integrated motor and dual throttle position sensors (often labelled VTA1/VTA2) as part of the ETCS-i system. This setup appears across the common engines of the period (1NZ-FE, 2NZ-FE, 2SZ-FE, 1KR-FE). Technical references include: Toyota New Car Features for Vitz/Yaris (XP90) – ETCS-i overview, Toyota Repair Manual – Engine Control (ETCS-i), throttle body with motor and dual TPS signals, and independent manuals such as the Haynes Toyota Yaris 2007–2017 guide noting the TPS is built into the throttle body rather than a separate, adjustable unit.

In this model, the throttle position sensors live inside the throttle body and continually report throttle plate angle to the ECU. The ECU cross-checks the two TPS signals and the accelerator pedal position sensor to manage airflow, idle speed, and torque requests. That means smooth take-offs, stable idle, and solid fuel economy when everything’s healthy.

Because the TPS is integral, it’s not a separate bolt-on item like older cable-throttle setups. If the sensor fails or the two tracks disagree, the car can drop into limp-home mode, light the MIL, and log codes like P0120–P0124, P0220–P0222 or P2135. Before condemning the assembly, smart servicing on a 2009 Vitz/Yaris starts with the basics under the bonnet: inspect the connector for corrosion or moisture, check the 5 V reference and ground, and look for damage in the loom near the throttle body. A careful throttle body clean can also help if the plate is gummed up—use proper throttle cleaner, avoid soaking the shaft, and don’t force the blade by hand.

If readings are out of spec or correlation fails, replacement usually means swapping the complete throttle body. After fitting, carry out an idle learn/throttle relearn with a scan tool (Techstream or equivalent), or follow the specified idle reset procedure. It’s worth clearing codes and confirming that both TPS signals sweep smoothly and track together in live data. As part of routine servicing in Australia or New Zealand, adding a quick visual check of the throttle body, ensuring the air filter and PCV system are in good nick, and scanning for pending DTCs will keep the TPS and ETCS-i happy for the long haul.

• Technical sources referenced: Toyota New Car Features (ETCS-i, Vitz/Yaris XP90), Toyota Repair Manual – Engine Control (Throttle Body with Motor, TPS VTA1/VTA2 diagnostics), Haynes Toyota Yaris 2007–2017 manual (TPS integrated with throttle body).

FAQs

Does a 2009 Toyota Vitz/Yaris have a throttle position sensor?
Yes. It uses an electronic throttle body with dual built-in throttle position sensors (part of Toyota’s ETCS-i system). They aren’t separate, adjustable items, they’re integral to the throttle body assembly.

What are common signs the TPS is playing up on a 2009 Yaris?
Tell-tales include erratic idle, hesitation, sudden loss of power with a check engine light, and limp-home mode. Scan tools often show codes like P0120–P0124 or P2135. Live data may reveal mismatched or jumpy TPS readings.

Can the TPS be replaced on its own, and what might it cost?
On this model, the TPS isn’t serviced separately. Replacement means a complete throttle body, followed by a relearn. Pricing varies widely by brand and region, budgeting for the assembly plus labour and calibration is sensible.