Parts for your 2005 Toyota Crown-Throttle position sensors

2005 Toyota Crown throttle position sensor (TPS)

Referencing Toyota’s technical literature for the S180-series Crown (2003–2008) — including the Engine Control (ETCS-i) sections of the Toyota Repair Manual, the Toyota Electronic Wiring Diagram (EWD), and the Toyota Electronic Parts Catalogue — the 2005 Toyota Crown is fitted with an electronically controlled throttle body that integrates a throttle position sensor (TPS) along with a throttle control motor. This setup is used on the 4GR-FSE and 3GR-FSE V6 engines common to the 2005 Crown range, and generates standard Toyota DTCs such as P0120–P0124 and P2135 when faults occur, confirming TPS involvement.

On this Crown, the TPS reports the actual throttle plate angle back to the engine ECU. Working in tandem with the accelerator pedal position sensor, it keeps throttle response smooth, trims fuel and ignition for efficiency, and coordinates idle speed, cruise control, and stability control. If the ECU can’t trust that signal, it may swing into limp-home mode to protect the engine and transmission — not ideal for the daily commute or a long run down the motorway.

• Common signs of a crook TPS: erratic idle, hesitation off the line, flat spots, surging at steady speeds, higher fuel use, harsh shifts, and the MIL on with relevant fault codes.
• Quick care tips: keep the connector clean and snug, check wiring near the throttle body for rub-through under the bonnet, and clean the throttle bore with proper throttle-body cleaner (engine off), don’t force the butterfly by hand.

Replacement on many GR-series Crowns typically involves the throttle body assembly, as the TPS is integrated and not intended as a separate service item from the factory. Owners chasing a lasting fix should opt for quality OEM or reputable aftermarket parts, fit a new gasket, and confirm there are no vacuum leaks.

1. Scan and record codes and live data (throttle angle, pedal angle, correlation).
2. Disconnect the battery and remove the intake ducting, swap the throttle body and gasket.
3. Reconnect, clear codes, and perform an idle/throttle learn. Many vehicles relearn after a warm-up and 5–10 minutes of idling with all loads off, some may need scan-tool initialisation of ETCS-i.
4. Road-test, then recheck for codes and stable idle.

There’s no strict replacement interval. As part of regular servicing (every 20,000–30,000 kilometres), a shop can inspect the connector, harness condition, and throttle cleanliness. Staying ahead of grime and poor connections keeps the TPS happy and the Crown driving sweet without dramas.

Does the 2005 Toyota Crown have a TPS, or only a pedal sensor?

It has both. The accelerator pedal sensor tells the ECU what the driver wants, while the throttle position sensor inside the throttle body confirms what the throttle plate is actually doing. Toyota’s ETCS-i relies on both signals for accuracy and safety.

Where is the TPS on a 2005 Crown, and can it be replaced on its own?

The TPS is built into the electronic throttle body on the front of the intake. On most GR-engined Crowns it isn’t a separate service part, so replacement usually means swapping the complete throttle body assembly and gasket.

Is a relearn needed after replacing the TPS/throttle body?

Yes. The ECU needs to relearn the throttle and idle positions. Many cars will self-learn after a warm-up and a period of idling with accessories off, some procedures are faster and more reliable with a scan tool capable of ETCS-i initialisation. Always clear any stored codes and confirm a stable idle afterwards.