Parts for your 2005 Toyota Caldina-Throttle position sensors

2005 Toyota Caldina throttle‑position‑sensor (TPS): purpose, servicing and fitment

Technical sources confirm the 2005 Toyota Caldina is fitted with a throttle‑position‑sensor. The Toyota Caldina T24‑series Repair Manual (SFI and ETCS‑i sections) describes a dual‑track TPS built into the electronic throttle body, with diagnostic routines for DTCs P0120–P0124 and P2135. The Toyota Electronic Parts Catalogue for T24# models (including 1ZZ‑FE, 1AZ‑FSE and ST246 3S‑GTE) lists the throttle body assembly with integrated motor and TPS. Toyota’s OBD‑II documentation for these engines also references TPS‑related signals used by the ECM. So, the TPS is relevant and present on 2005 Caldina variants, on ETCS‑i cars it’s integrated into the throttle body, while certain cable‑throttle versions use a bolt‑on TPS.

On this Caldina, the throttle‑position‑sensor tells the engine computer exactly how far the throttle plate is open. That lets the ECM match fuel, ignition timing and transmission shift strategy to the driver’s right foot. A healthy TPS keeps throttle response crisp, idle stable and fuel economy tidy on the daily commute as well as the weekend run up the coast.

Because many 2005 Caldinas use Toyota’s ETCS‑i (drive‑by‑wire), the TPS is part of the throttle body and not serviced separately. If TPS signals go wonky, the ECM may throw an engine light, log codes like P0120/P0122/P0123 or P2135, and drop into limp mode to protect the engine. Common tell‑tales include a hunting idle, flat spots on acceleration, poor kickdown or a sudden lack of power.

As part of sensible servicing, workshops usually:

• Scan live data for smooth, linear TPS voltage or percentage with no dropouts.
• Inspect the connector and loom for corrosion, stretched pins or brittle insulation.
• Clean the throttle bore and plate using throttle‑safe cleaner, avoiding the motor/TPS housing.
• Perform an idle/throttle relearn after battery disconnect or throttle cleaning, using a scan tool where applicable.

If the TPS is integrated and confirmed faulty, replacement means swapping the complete throttle body and fitting a new gasket. It’s a straightforward job for a technician with a scan tool to calibrate the new unit. For cable‑throttle variants with a bolt‑on TPS, the sensor can be replaced on its own and adjusted so closed‑throttle voltage sits within spec per the Toyota manual. Either way, fresh coolant (if hoses are removed), an air intake check and a quick road test to verify smooth throttle behaviour round out the job.

Owners who keep an eye on scan data, electrical integrity and a clean throttle body typically enjoy many kilometres of fuss‑free motoring from the Caldina’s TPS setup.

Popular questions

Where is the TPS on a 2005 Caldina?
The TPS lives on the throttle body. On ETCS‑i models it’s built in alongside the throttle motor, on cable‑type versions it’s a small black sensor bolted to the side of the throttle shaft. The throttle body sits on the intake manifold at the front of the engine bay, making access reasonably straightforward under the bonnet.

What symptoms and fault codes point to a failing TPS?
Typical symptoms are erratic idle, hesitation off the line, surging, poor fuel economy and occasional limp mode. The ECM often logs P0120, P0122, P0123, P0124 or the correlation code P2135. A scan of live data will show TPS percentage or voltage that isn’t smooth as the pedal is pressed.

Can the TPS be cleaned or must it be replaced?
The sensor itself isn’t cleanable. Cleaning the throttle bore helps sticky throttle issues, but a faulty integrated TPS usually means replacing the throttle body assembly. On cable‑throttle variants with a separate TPS, the sensor can be replaced and adjusted. After any work, an idle/throttle relearn using a scan tool is recommended.