Parts for your 2000 Toyota Bb-Throttle position sensors

2000 Toyota bB Throttle Position Sensor (TPS)

Based on Toyota technical literature, the 2000 Toyota bB does use a throttle position sensor. Toyota’s Electrical Wiring Diagram (EWD) for the NCP30/31 series (2000 model year) shows a TPS on the throttle body feeding VTA and VC/E2 circuits to the ECM, and the Toyota Repair Manual (SFI/engine control sections) includes TPS inspection steps. Common parts catalogues for the 1NZ‑FE and 2NZ‑FE fitted to the bB also list a TPS, confirming it’s a relevant, fitted component.

For the 2000 Toyota bB, the throttle position sensor is a key input for the engine computer. It tracks the angle of the throttle plate and tells the ECU exactly how much air the engine is trying to breathe. With that info, the ECU tidies up fuelling and ignition timing, smooths idle quality, and can influence auto shift behaviour where applicable. Drivers notice its work as crisp throttle response and decent fuel economy on the daily commute.

As part of routine servicing, it’s smart to give the throttle body a clean and eyeball the TPS connector and loom for corrosion or brittle insulation. A flaky TPS can cause rough idle, flat spots off the line, higher fuel use, or trigger fault codes like P0120–P0123. If a scan tool shows erratic throttle angle or a multimeter reveals jumpy voltage (typically around 0.5 V closed throttle sweeping smoothly to about 4.5 V at wide-open), it’s time to sort it.

Replacement depends on which setup the bB has. Some variants use a cable throttle with a separate, adjustable TPS that can be rotated slightly to set base voltage. Others use Toyota’s ETCS‑i electronic throttle where the TPS is built into the throttle body and isn’t adjustable—if the sensor fails, the throttle body assembly is usually replaced. Either way, go for quality components (OE-equivalent) to avoid comeback issues.

Handy tips after work: clear any stored codes, perform an idle relearn if needed (let it idle with all accessories off until warm), and check for updated ECU calibrations if odd behaviour lingers. Done right, a healthy TPS keeps the bB feeling lively and predictable, whether it’s city runs or longer kilometres down the motorway.

• Typical symptoms: hunting idle, hesitation, harsh shifts, poor economy, MIL on.
• Basic test: smooth voltage sweep from closed to wide-open throttle with no dropouts.

FAQs

Does the 2000 Toyota bB actually have a TPS?
Yes. Toyota’s EWD for the NCP30/31 bB shows a throttle position sensor on the throttle body providing a VTA signal to the ECM. The factory repair manual also details TPS testing, so it’s a standard, fitted part on this model.

What are the signs the TPS is failing on a 2000 bB?
Common giveaways include a surging or unstable idle, sluggish take‑off, random stalling when rolling to a stop, or higher fuel consumption. The check engine light may set codes like P0120–P0123. A live‑data check will often show erratic throttle angle, and a multimeter test will reveal a choppy voltage sweep.

Is the TPS adjustable or part of the throttle body on the bB?
It depends on the exact variant. Cable‑throttle setups use a separate, slightly adjustable TPS. ETCS‑i versions integrate the TPS into the electronic throttle body, so there’s no adjustment—faults typically require replacing the throttle body assembly.