Parts for your 2017 Toyota Crown-Throttle position sensors

2017 Toyota Crown throttle position sensors (TPS): what they do and how to look after them

Based on Toyota’s own technical literature – including the New Car Features (NCF) and Repair Manual for the S210-series Crown – the 2017 Toyota Crown uses Electronic Throttle Control (ETCS‑i) with dual throttle position sensors integrated into the throttle body. The ECM monitors these sensors against the accelerator pedal position sensors, so throttle position sensing is absolutely relevant and fitted on this model.

On the 2017 Toyota Crown, the throttle position sensors sit inside the electronic throttle body as a dual-track unit. Their job is to report the exact angle of the throttle plate so the engine control module can manage fuelling, ignition timing, turbo boost (on 8AR‑FTS models), transmission shift strategy and, on hybrids, the coordination between the petrol engine and the electric drive. Toyota’s ETCS‑i design uses two TPS circuits for redundancy, if the signals don’t agree, the ECM flags a fault and may drop the vehicle into a limp-home mode to protect the engine and drivetrain.

These sensors aren’t a routine replacement item, and on most Crowns of this generation they’re supplied as part of the throttle body assembly rather than a separate service part. If drivability issues show up – think erratic idle, hesitation off the line, hunting revs, sudden loss of power, or a Check Engine Light with codes like P0120–P0124 or P2135 – diagnosis should confirm whether the TPS/throttle body is at fault before parts go in the bin.

Good servicing habits go a long way:

• Inspect the throttle body for carbon build-up and clean with throttle body-safe cleaner when needed. Don’t force the throttle plate open by hand and avoid flooding the shaft area.
• Check the harness and connector for corrosion, moisture ingress or damaged pins – voltage drop or bad grounds can mimic a failed sensor.
• After throttle body replacement or significant cleaning, carry out ETCS‑i/throttle learn initialisation with a capable scan tool (e.g., Toyota Techstream) so the ECM knows the new zero and full-angle positions.
• Use genuine or high-quality parts, poor tolerances can cause signal mismatch and repeat faults.

When replacement is necessary, the technician will generally fit a complete throttle body, renew the gasket, verify air leaks aren’t present, clear fault codes and perform the throttle learning procedure. Done right, the Crown’s throttle behaviour returns to smooth, predictable and efficient – which is exactly what owners expect from a well-sorted Toyota.

Popular questions

Does the 2017 Toyota Crown have a throttle position sensor?
The 2017 Crown does have throttle position sensing. Toyota’s ETCS‑i throttle body contains two TPS circuits that the ECM uses to monitor and control throttle angle, confirmed by Toyota NCF and the S210 Repair Manual. It’s a core part of the drive‑by‑wire system.

Can the TPS be replaced separately on a 2017 Crown?
In most cases, no. On this model the TPS is integrated into the electronic throttle body and isn’t serviced as a standalone sensor. If testing confirms a TPS fault, the typical repair is to replace the throttle body assembly, then perform the ETCS‑i learn/initialisation with a scan tool.

What are common signs the TPS/throttle body needs attention?
Owners may notice a Check Engine Light, rough or high idle, flat spots on acceleration, poor fuel economy, or the vehicle entering limp mode. Diagnostic trouble codes like P0120–P0124 or P2135 often appear when the two TPS signals don’t correlate. Proper testing should rule out wiring or connector faults before replacing parts.