Parts for your 2009 Toyota Ractis-Throttle position sensors

2009 Toyota Ractis Throttle Position Sensor (TPS)

On the 2009 Toyota Ractis (NCP100/NCP105 with 1.3-litre 2SZ‑FE or 1.5‑litre 1NZ‑FE), a throttle position sensor is absolutely used. Toyota’s factory literature – including the SFI/ETCS‑i sections of the Toyota Repair Manual for these engines, the Toyota Electrical Wiring Diagram showing VTA1/VTA2 TPS circuits, and the New Car Features materials for contemporary Vitz/Yaris-based models – all document an electronic throttle body with an integrated motor and dual TPS sensors. The ECM monitors VTA1/VTA2 and will log DTCs such as P0120–P0123 and P2135 if the TPS signals go out of range or disagree.

The TPS in this Ractis is built into the electronic throttle body (ETCS‑i), rather than being a separate, external sensor. Its job is to report the actual throttle plate angle to the engine computer so fuelling, ignition timing, and idle control stay on song. Because it’s a dual-sensor setup, the ECM constantly cross-checks the two signals for safety and accuracy. That’s why it’s central to smooth tip‑in, decent fuel economy, and stable idle.

For servicing, the throttle body and its TPS are treated as one unit. If the TPS portion fails or the correlation between VTA1 and VTA2 goes pear‑shaped, the correct repair on these engines is typically to replace the throttle body assembly and fit a new gasket, rather than trying to swap a sensor. After replacement or any battery reset, an idle learn/throttle learn may be needed, Toyota’s procedures can be performed with a scan tool (Techstream) or by allowing the engine to reach operating temperature and idle with accessories off for a short period.

Good maintenance goes a long way:

• Keep the throttle bore clean with the right cleaner and a light hand. Don’t soak the electronics or force the plate open aggressively.
• Inspect the connector and loom for oil wicking, corrosion, or broken wires near the throttle body.
• Use a scan tool to watch the TPS angles (often shown as VTA1/VTA2 or throttle opening). The signal should sweep smoothly with no dropouts.
• If symptoms crop up – erratic idle, flat spots, limp mode, or the MIL with TPS‑related DTCs – check for air leaks and wiring first, then consider the throttle body assembly.

Done properly, throttle bodies on these Ractis engines tend to be set‑and‑forget for many years and kilometres. When they do need attention, sticking with quality parts and following the factory procedure keeps things reliable and drama‑free.

Popular questions about 2009 Toyota Ractis throttle position sensors

Does a 2009 Toyota Ractis have a TPS that can be replaced on its own?
The 2009 Ractis uses an electronic throttle body with the TPS built in. On most 1NZ‑FE and 2SZ‑FE units of this era, Toyota does not service the TPS separately – the recommended fix for a faulty TPS signal is to replace the complete throttle body assembly and its gasket.

What are the signs the TPS/throttle body is playing up on a Ractis?
Common clues include unstable idle, hesitation off the line, poor fuel economy, or limp mode with warning lights. Scan tools often show DTCs like P0120–P0123 or P2135. Before condemning the part, it’s smart to check for intake air leaks, a dirty throttle bore, and connector or wiring issues.

Is calibration needed after throttle body replacement?
Yes, a brief relearn helps. With a scan tool (Techstream), run the throttle/idle air volume learn. Without one, warm the engine fully and let it idle with all accessories off for a few minutes. The ECM will adapt and stabilise idle and throttle control.