Parts for your 2002 Toyota Caldina-Throttle position sensors

2002 Toyota Caldina throttle position sensor (TPS): what it does and how to look after it

Is a throttle position sensor used on a 2002 Toyota Caldina? Yes — it’s absolutely relevant and fitted across the range. Technical sources including the Toyota Caldina T24x/ST246 Repair Manual (Throttle Body/ETCS-i sections), Toyota Electronic Parts Catalogue listings for ZZT241 (1ZZ-FE), AZT241 (1AZ-FSE) and ST246 (3S-GTE), and Denso throttle body specifications confirm a TPS is present. On ETCS‑i models (1AZ‑FSE and 3S‑GTE) the TPS is integrated into the motorised throttle body, on the cable‑throttle 1ZZ‑FE it’s a bolt‑on sensor on the side of the throttle body.

The TPS tells the engine control module exactly how far the throttle plate is open. That signal is used to manage fuelling, ignition timing, transmission shift strategy and, on ETCS‑i cars, to cross‑check the accelerator pedal sensors for safety. When it’s healthy, drivers get crisp throttle response, smooth idle and decent fuel economy. When it’s unhappy, the car can feel flat, surge, hesitate, or even drop into limp mode.

While the TPS isn’t a “replace every X km” service item, it benefits from a bit of attention during routine servicing of a 2002 Caldina. Give the throttle body a careful clean (throttle‑safe cleaner only), check the TPS connector for corrosion or loose pins, and make sure the wiring loom isn’t chafed near the throttle body. On ETCS‑i cars, any work on the throttle body should be followed by an idle/throttle learning procedure with a scan tool. If fault codes such as P0120–P0124/P0220 range/ performance/ correlation show up, diagnostics should include live‑data checks of VTA signals and a wiggle test of the harness.

• Typical symptoms of a failing TPS: erratic idle, flat spots on take‑off, poor economy, harsh or late shifts (auto), MIL on with P0120–P0124/P0220 codes, and occasional stalling when coming to a stop.
• Practical tips: don’t drown the sensor in cleaner, don’t overtighten mounting screws on cable‑throttle units, and always clear codes and perform a throttle relearn after replacement.

Replacement is straightforward on the 1ZZ‑FE (two screws and an alignment to the throttle shaft, confirm base voltage on a scan tool). On ETCS‑i 1AZ‑FSE and 3S‑GTE the TPS is built into the throttle body, so the assembly is replaced as a unit, use new gasket, check coolant hoses if routed through the body, and complete the learning procedure. Genuine or OE‑quality parts are recommended to avoid tracking or dead‑spot issues that can show up with cheap pattern sensors.

Does a 2002 Toyota Caldina have a throttle position sensor?

Yes. All 2002 Caldina engines use a TPS. The 1ZZ‑FE uses a separate bolt‑on TPS, while the 1AZ‑FSE and 3S‑GTE use an integrated TPS within the electronic throttle body (ETCS‑i). This is documented in Toyota’s Repair Manual and EPC for the T24x/ST246 series.

What are common signs the TPS is playing up on a 2002 Caldina?

Look for an erratic idle, hesitation off the line, sudden surging, poor fuel economy, harsh or odd auto shifts, and a check‑engine light. Scan tools often show P0120–P0124/P0220 range, performance or correlation faults. Live‑data will typically reveal a noisy or flat‑spot TPS signal.

Can the TPS be cleaned or does it need replacing?

The sensor itself is sealed, cleaning usually won’t repair a worn track. Cleaning the throttle body and connector can help if grime or poor contact is the cause. If the TPS has dead spots or out‑of‑range readings, replacement is the fix. On ETCS‑i models the entire throttle body is replaced, then carry out a throttle/idle relearn with a scan tool.