Parts for your 2015 Toyota Crown-Throttle position sensors

2015 Toyota Crown throttle position sensor: purpose, servicing, and replacement

Yes, the 2015 Toyota Crown uses a throttle position sensor (TPS). Toyota’s technical literature for the S210-series Crown confirms this: the ETCS‑i (Electronic Throttle Control System – intelligent) throttle body contains a throttle actuator motor and dual, non-contact throttle position sensors (often labelled Throttle Position Sensor No.1 and No.2, signals VTA1/VTA2 to the ECM). This is documented in Toyota’s New Car Features (ETCS‑i) and the Crown Repair Manual/Engine Control System sections, which also list related DTCs (e.g., P0120–P0124, P0220–P0225, P2135).

On the 2015 Crown, the TPS continuously reports the exact angle of the throttle plate so the engine ECU can manage fuel injection, ignition timing, idle speed, transmission shift logic, and stability/traction control. In hybrid variants, it also helps coordinate engine output with the electric drive for smooth, efficient take-off. Because it’s a drive‑by‑wire system, accurate TPS feedback is key to predictable throttle response and safe limp‑home strategies if a fault is detected.

There’s no routine replacement interval for the TPS, Toyota integrates it into the throttle body, using a contactless design that doesn’t wear like old potentiometers. During regular services (every 10,000–15,000 km), it’s smart to:

• Scan for related fault codes and data mismatches between Accelerator Pedal Position and TPS (VTA1/VTA2).
• Visually check the harness and connector under the bonnet for chafing, corrosion, or moisture ingress.
• Inspect and, if needed, carefully clean the throttle bore and plate to remove carbon that can affect idle stability.

If the sensor itself fails, the fix is to replace the throttle body assembly. Use a new gasket, torque the bolts to spec, and avoid forcing the throttle plate by hand. After any throttle body replacement or major cleaning, perform a throttle/idle learning procedure with Toyota Techstream (or a capable scan tool) so the ECU can relearn the target angles. Battery disconnects may also require an idle relearn. Typical warning signs of trouble include a Check Engine light, harsh or hunting idle, poor fuel economy, sluggish response, and the car dropping into limp mode.

Owners sometimes mix up the TPS with the Accelerator Pedal Position Sensor, the Crown has both. A good workshop will verify which side of the system is at fault before fitting parts, saving time and dollars.

Popular questions

Does the 2015 Toyota Crown have a separate, replaceable TPS?
The 2015 Crown’s TPS is built into the throttle body with the actuator motor. Toyota doesn’t sell the TPS separately, so a confirmed sensor fault means replacing the entire throttle body assembly. That said, many drivability issues come from wiring or carbon build‑up, so diagnosis first is the go.

What symptoms point to a failing TPS on a 2015 Crown?
Drivers may notice a Check Engine light, rough or high idle, flat spots on take‑off, surging, or the vehicle entering limp mode. Scan tools often show TPS correlation codes (such as P0121 or P2135). Always check the connector and earths before condemning the throttle body.

Is a relearn needed after throttle body work?
Yes. After cleaning or replacing the throttle body, run a throttle/idle learn using Toyota Techstream or an equivalent tool. This helps the ECU relearn throttle plate minimums for stable idle and smooth response. Without it, the Crown may idle poorly or flare until it adapts.