Parts for your 2005 Daihatsu Bego-Throttle position sensors

2005 Daihatsu Bego throttle position sensor: fitted, what it does, and how to look after it

Technical sources confirm the 2005 Daihatsu Bego (J200-series, 3SZ-VE 1.5 petrol) uses a throttle position sensor. Daihatsu/Toyota workshop literature for the J200 Terios/Rush/Bego platform describes an electronically controlled throttle body (ETCS) that incorporates dual throttle position sensing circuits, and Denso’s ETCS training material outlines the same twin-sensor arrangement inside the throttle body. Genuine parts catalogues for the 3SZ-VE also list a throttle body assembly with integrated motor and TPS rather than a stand-alone sensor. So yes—this Bego is fitted with a throttle position sensor, and it’s built into the throttle body assembly.

On this model, the throttle position sensor (TPS) tells the engine computer exactly how far the throttle plate is open. That live angle data helps the ECU sort fuel delivery, ignition timing, idle control, and even transmission shift strategy. Because it’s an electronic throttle, the Bego also has an accelerator pedal position sensor (at the pedal) that works alongside the TPS in the throttle body—two independent signals so the ECU can cross-check for accuracy and safety.

Day-to-day, a healthy TPS means crisp throttle response, steady idle, and decent fuel economy. When the TPS goes out of whack you’ll often see the check-engine light and feel symptoms like hesitation, hunting idle, poor kickdown, or limp-home behaviour. Common fault codes include P0120–P0123, P0220–P0223, and P2135.

Service-wise, there’s no set replacement interval, but it’s smart to:

• Inspect the throttle body and connector at major services (say, every 20,000–30,000 km).
• Clean light carbon from the throttle bore with throttle-body-safe cleaner—avoid flooding the electronics.
• Scan live data to confirm throttle angle moves smoothly from closed to open with no dropouts.

If replacement is needed, note the TPS on this Bego is integral to the throttle body. In most markets you replace the whole assembly and fit a new gasket. After refit, clear codes and perform throttle/idle learning with a scan tool (or follow the factory idle relearn procedure). Don’t force the throttle plate by hand, and keep the connector clean and terminals tensioned. If faults persist after cleaning and relearn, check grounds, 5-volt reference, and harness continuity before condemning the assembly.

This approach keeps the 3SZ-VE running sweet, with smooth take-off and tidy fuel use—just the way owners across Australia and New Zealand like it.

Popular questions about 2005 Daihatsu Bego throttle position sensors

Does the 2005 Daihatsu Bego actually have a TPS?
Yes. The Bego’s electronic throttle body contains dual throttle position sensors. The ECU uses them to verify throttle angle and to cross-check the accelerator pedal sensor for safety.

Can the TPS be replaced on its own?
Generally, no. On the 3SZ-VE the TPS is built into the throttle body with the throttle motor. Most service information and parts listings specify replacing the entire throttle body assembly, then performing a throttle/idle relearn.

What fault codes point to a bad TPS on a Bego?
Expect codes like P0120–P0123, P0220–P0223, and P2135. Before blaming the throttle body, rule out wiring, connector corrosion, and 5 V reference issues, and verify with scan-tool data for smooth, linear throttle angle.