Parts for your 2018 Toyota Crown-Throttle position sensors

2018 Toyota Crown throttle position sensors (TPS)

Based on Toyota technical literature, the 2018 Toyota Crown is fitted with throttle position sensors as part of Toyota’s electronic throttle control system (ETCS‑i). The Crown’s motorised throttle body contains dual throttle position signals (often labelled VTA1/VTA2) that the engine control module uses for precise control and cross‑checking. This is documented in Toyota New Car Features (Crown S220, 2018–) under ETCS‑i, Toyota Repair Manual diagnostics for DTCs P0120–P0124 and P0220–P0224, and the Toyota Electronic Parts Catalogue describing the “Throttle Body with Motor” assembly that houses the sensors.

For owners and fleets looking after a 2018 Toyota Crown, the throttle position sensors are the quiet achievers that tell the engine computer exactly how far the throttle plate is open. That info is critical for smooth take‑offs, tidy idle, crisp tip‑in under the bonnet, cruise control accuracy, hybrid blending (where fitted), and even traction and stability control behaviour. On this model, the TPS is built into the throttle body, so it’s not a separate bolt‑on sender like older cars.

There’s no fixed service interval for the TPS, but it’s smart to give the throttle body a once‑over during scheduled servicing, especially if the Crown’s doing lots of short trips around town. A careful clean of the throttle bore and plate with a throttle‑safe cleaner can help keep readings stable. Don’t flood the electronics or pry the plate open aggressively—gentle is the go. Always disconnect the battery and follow workshop safety basics.

If the car throws a Check Engine Light with codes like P0120/P0220, drops into limp mode, idles rough, surges, or hesitates off the line, a TPS plausibility issue could be in play. A proper scan of live data to compare the two throttle position signals, plus a close look at the connector and wiring, should come first. Because the sensor is integral to the throttle body on the 2018 Crown, replacement typically means swapping the complete throttle body assembly rather than just the sensor. After replacement or a deep clean, the ETCS‑i will usually need an idle/throttle learn procedure with a scan tool (Techstream or equivalent) to settle the new baseline. Stick to genuine‑quality parts and the factory torque specs from the Toyota Repair Manual to keep things reliable over the long haul.

• Key signs to watch: MIL on with P0120–P0124 or P0220–P0224, erratic idle, delayed throttle response, poor fuel economy.
• Best practice: inspect connectors, clean the throttle body carefully, perform throttle/idle relearn after major work.
• Replacement: throttle body assembly if the TPS is out of spec or has internal faults.

Popular questions about 2018 Toyota Crown throttle position sensors

Does the 2018 Toyota Crown actually have a throttle position sensor?
Yes. The 2018 Crown uses Toyota’s ETCS‑i, which includes dual throttle position sensors built into the motorised throttle body. The ECU reads both signals to confirm the actual throttle angle for smooth, safe engine control.

What symptoms point to a failing TPS on a 2018 Crown?
Common giveaways are a Check Engine Light with codes like P0120 or P0220, limp‑home behaviour, rough or wandering idle, surging at steady speed, flat spots on acceleration, and higher fuel use. These symptoms can overlap with other issues, so a scan of live data and a wiring check is the way to pinpoint the fault.

Can the TPS be replaced separately, or does the whole throttle body need changing?
On this model the TPS is integrated into the throttle body, so the standard repair is to replace the complete throttle body assembly. After fitting, perform an ETCS/idle relearn with a scan tool so the ECU can calibrate the new unit.