Parts for your 2006 Toyota Avensis-Throttle position sensors

2006 Toyota Avensis throttle position sensors — what they do and how to look after them

Based on Toyota’s service information (TIS) for the Avensis T25, the factory Repair Manual and Electrical Wiring Diagram, and independent sources such as Haynes and Autodata, the 2006 Toyota Avensis does use throttle position sensing. On the petrol models (VVT‑i/ETCS‑i), the throttle position sensors are built into the electronic throttle body alongside the throttle actuator motor. On the later D‑4D diesels (1AD/2AD), an electronically controlled intake throttle (for EGR control and smooth shutdown) carries its own position sensor. So yes — a throttle position sensor is fitted on this model range, though it’s typically integrated rather than a separate bolt‑on switch.

The throttle position sensors tell the engine ECU exactly where the throttle plate is, in real time. That lets the ECU match air, fuel and ignition (and on diesels, EGR behaviour) for smooth drivability, emissions compliance and decent fuel economy. On ETCS‑i cars, there are dual, self‑checking sensor tracks in the throttle body for redundancy, working alongside the accelerator pedal position sensor.

There’s no scheduled replacement for these sensors. As part of routine servicing, it’s smart to inspect the throttle body, its connector and wiring. In Aussie and Kiwi conditions — heat, dust and salty air — connectors can oxidise and throttle bores can gum up. Clean the throttle bore with a proper throttle‑body cleaner and a lint‑free cloth, keeping solvents away from the actuator and sensor housing. Avoid forcing the butterfly by hand on drive‑by‑wire units.

Typical warning signs include an erratic idle, flat spots, cruise control dropping out, or the MIL on with codes like P0120–P0123, P0220–P0223 or P2135. A quick scan‑tool check of live data should show a smooth, linear change in throttle angle. If readings jump about, confirm the 5‑volt reference and ground, and check the harness near the throttle body for chafe.

On most 2006 Avensis variants, the TPS is integrated into the throttle body, so replacement usually means swapping the complete throttle body assembly. Always fit a new gasket, clear fault codes and perform the throttle/idle learn with a capable scan tool (Toyota calls this throttle valve initialisation). Where a diesel intake throttle is fitted, follow the same principles and carry out any required ECU calibration. Genuine or high‑quality OEM‑equivalent parts are recommended — they tend to last longer and play nicely with the factory calibration.

• Keep connectors clean and pinned tight
• Clean the throttle bore during major services
• Use a scan tool to verify smooth throttle angle data

Popular questions

Does the 2006 Avensis have a separate TPS or is it built in?
On most 2006 petrol Avensis models with ETCS‑i, the TPS is built into the electronic throttle body along with the motor, using dual sensor tracks. The accelerator pedal has its own position sensors as well. Many D‑4D diesels use an intake throttle for EGR/shutdown, and its position sensor is part of that assembly.

Can the TPS be cleaned or repaired, or does it need replacing?
The sensor itself isn’t serviceable. Clean the throttle bore only and keep solvents away from the actuator/sensor housing. If the TPS signal is faulty and wiring checks out, replace the throttle body (or the diesel intake throttle assembly, as applicable).

Is a relearn needed after replacing the throttle body?
Yes. After fitting the new unit, clear codes and run a throttle/idle learn (initialisation) with a suitable scan tool. This helps the ECU store the correct closed and open positions for stable idle and crisp response.