Parts for your 2012 Toyota Crown-Throttle position sensors

2012 Toyota Crown throttle position sensor (TPS) — what it does and how to look after it

Yes, the 2012 Toyota Crown uses a throttle position sensor. On this model the TPS is built into the electronic throttle body as part of Toyota’s ETCS-i (Electronic Throttle Control System – intelligent). This design is shown in Toyota service literature for the Crown GRS200/GRS204/GRS210 series (engine control section) and in the Toyota Electrical Wiring Diagram, which labels the dual TPS outputs as VTA1/VTA2 feeding the ECM. Those factory documents also list relevant OBD-II DTCs (P0120–P0124, P0220–P0224), confirming the TPS is monitored and used by the ECM.

On a 2012 Toyota Crown—whether it’s a V6 like the 4GR‑FSE/2GR‑FSE or the later 2.5-litre hybrid—the TPS tracks the exact angle of the throttle plate and tells the ECM how much air the engine’s getting. The ECM blends that with accelerator pedal position, engine speed and load to sort fuel delivery, ignition timing, gearbox shift behaviour, cruise control and traction systems. Because it’s drive‑by‑wire, the car relies on the TPS for smooth take‑off, clean gear changes and steady idle. The Crown’s throttle body carries dual TPS tracks for redundancy, so if one reading drifts, the ECM can spot it and go to failsafe.

There’s no fixed replacement interval for the TPS on this Crown. It’s not a separate bolt‑on sensor, it’s integrated into the throttle body. If the sensor itself fails or the tracks disagree, the cure is usually a complete throttle body replacement followed by an idle/throttle learn with a scan tool. For routine servicing, the best approach is prevention and inspection.

• At each service, check the throttle body connector and harness for corrosion, moisture or chafing. Poor connections can trigger TPS correlation faults.
• Every 60,000–80,000 km, consider a careful throttle bore clean to remove carbon that can make the blade stick around idle. Use a sensor‑safe cleaner, don’t flood the shaft area.
• If the battery’s been disconnected or the throttle body cleaned/replaced, perform the ETCS idle/throttle learning procedure (preferably with Techstream or an equivalent scan tool).
• Watch for symptoms like hesitation, high or hunting idle, harsh or delayed shifts, cruise control dropping out, limp mode and the MIL on. Common codes include P0120, P0122, P0123, P0220, P2135 and friends.
• When replacing the throttle body, fit a new gasket, torque bolts evenly, and avoid twisting the loom. After fitment, complete the relearn so it idles and drives properly.

For hybrid variants, the same guidance applies—the engine still uses an ETCS‑i throttle body with a built‑in TPS. No high‑voltage work is needed for this job, but always follow Toyota’s repair manual steps.

Popular questions about 2012 Toyota Crown throttle position sensors

Does the 2012 Toyota Crown have a separate TPS I can change on its own?
No. On this Crown the throttle position sensor is integrated into the electronic throttle body. If the TPS has failed, the usual fix is to replace the entire throttle body assembly and carry out the throttle/idle learn with a scan tool.

What fault codes point to a bad TPS on a 2012 Crown?
Look for codes like P0120, P0122, P0123, P0220, P0222, P0223 and P2135. These relate to TPS circuit performance, low/high signals and correlation between the dual tracks. Wiring issues, connector corrosion or a sticking throttle can set similar codes, so run proper diagnostics before fitting parts.

Will cleaning the throttle body fix TPS problems?
Cleaning can sort a sticky throttle plate and improve idle quality, but it won’t repair an internal TPS fault. If the ECM records TPS track disagreement or erratic signals from inside the throttle body, replacement of the assembly is the reliable remedy.