Parts for your 2006 Toyota Ractis-Throttle position sensors

2006 Toyota Ractis throttle-position-sensors (TPS): what they do and how to look after them

For the 2006 Toyota Ractis (NCP100/NCP105 with 1NZ-FE 1.5L or 2SZ-FE 1.3L), a throttle-position-sensor is absolutely used and relevant. Toyota’s factory repair literature for the Ractis SFI system (ETCS‑i) specifies dual throttle position signals (VTA1/VTA2) inside the throttle body, and related diagnostics such as DTCs P0120–P0124 and P2135. Toyota’s Electronic Parts Catalogue also shows the “Throttle Body with Motor” assembly, which includes the TPS, it isn’t listed as a separate, adjustable component. That means the Ractis uses an integrated TPS design as part of its electronic throttle body.

The throttle-position-sensors tell the engine ECU exactly how far the throttle plate is open. On the 2006 Ractis, the setup is electronic (ETCS‑i): the accelerator pedal is read by a pedal sensor, the ECU drives an electric motor on the throttle body, and the TPS (two tracks for redundancy) reports the real throttle angle back to the ECU. This tight feedback loop trims fuel, spark and idle speed, smooths gear changes, and helps with emissions. If those twin signals disagree or go out of range, the ECU can chuck the car into limp-home to protect the engine and you’ll usually see the MIL on.

There’s no routine replacement interval for the throttle-position-sensors on a Ractis. They’re sealed inside the throttle body and aren’t adjustable. If the TPS fails or its signals don’t correlate, the remedy is typically to replace the throttle body assembly. When servicing, a few smart habits help:

• Keep the air filter fresh and make sure the intake duct seals properly to stop dust chewing out the throttle shaft area.
• Clean the throttle bore and edges with a throttle-body-safe cleaner (avoid drowning the sensor area). This can stabilise idle if there’s carbon build-up.
• If the battery’s been disconnected or the throttle body replaced, perform an idle relearn/ETCS‑i initialisation with a capable scan tool (Toyota Techstream or equivalent).
• Use a scan tool to check live data: look at Throttle Position (%) and the two VTA signals tracking smoothly with no flat spots. Correlation faults often flag P2135.

Common signs of trouble include erratic idle, hesitation off the line, poor fuel economy, and a stuck‑throttle feeling or limp mode. If fitting a new throttle body, use a new gasket, torque the fasteners evenly, and confirm there are no vacuum leaks. Genuine or quality aftermarket units both work, but make sure they suit your exact engine code and build date.

FAQs

Does a 2006 Toyota Ractis have a separate, adjustable TPS?
No. On this model the throttle-position-sensors are built into the electronic throttle body with the motor. There’s no separate adjustment, the ECU relies on two internal TPS tracks (VTA1/VTA2) and will log a fault if they don’t agree.

Can the TPS be replaced without changing the throttle body?
Generally, no. Toyota supplies the assembly as a “Throttle Body with Motor” which includes the sensors. If the TPS is faulty, the standard repair is to replace the throttle body, then carry out an idle relearn/ETCS‑i initialisation.

How can someone check for TPS issues at home?
A basic OBD2 scan tool can read throttle position and pending codes. Look for smooth changes in throttle percentage as the pedal is pressed. If it jumps, sticks or throws codes like P0120–P0124 or P2135, the throttle body may need cleaning, testing, or replacement. Always rule out intake leaks and a dirty throttle bore first.