Parts for your 2012 Daihatsu Bego-Throttle position sensors

2012 Daihatsu Bego Throttle Position Sensor (TPS)

The 2012 Daihatsu Bego (J200/J210, same platform as Terios/Toyota Rush with the 3SZ-VE 1.5L engine) does use a throttle position sensor. It’s part of the electronic throttle control system (drive‑by‑wire), built into the throttle body along with the throttle motor. Technical sources that confirm this include:

• Daihatsu Terios J200/J210 Workshop Manual – ETCS/EFI sections describe dual throttle position sensing within the throttle body.
• Toyota 3SZ‑VE Engine Repair Manual – details for electronic throttle body with TPSs and related DTCs (P0120–P0124, P2135).
• Daihatsu/Toyota electronic parts catalog – lists the throttle body assembly supplied with integrated sensors (not a separate TPS part).

On this model, the TPS tells the engine ECU exactly where the throttle plate sits so it can manage fuelling, ignition timing and idle control, and work smoothly with the accelerator pedal position sensor. It’s a big player in how the Bego drives day‑to‑day, affecting response, emissions and even auto transmission shift behaviour.

Because the TPS is integrated, most servicing focuses on keeping the throttle body healthy and the wiring sound. A good workshop will:

• Inspect the throttle body every 40,000–60,000 kilometres, cleaning carbon from the bore and plate with sensor‑safe throttle cleaner (never force the plate by hand).
• Check the connector and loom for corrosion, loose pins or chafing, especially if the vehicle sees off‑road or coastal use.
• Scan live data to confirm the throttle angle tracks smoothly from closed to open with no spikes or drop‑outs, and review any MIL/DTCs (P0120–P0124, P0220, P2135).
• Perform a throttle/idle relearn after battery disconnect, cleaning or replacement so the ECU knows the correct closed position.

Replacement is straightforward but precise. Since the TPS isn’t sold separately, the throttle body is replaced as a unit. That means removing the intake duct, unplugging the connector, releasing coolant hoses if fitted, and swapping the gasket. Keep everything spotless to avoid ingesting grit, torque the fasteners evenly, reconnect and then carry out the relearn procedure and clear codes. Quality parts matter here—cheap units can introduce drift or mismatched calibration.

Typical signs of TPS/throttle body trouble include erratic idle, hesitation, poor fuel economy, stalling, limp‑home behaviour and an illuminated check engine light. Catching it early with a clean and a scan often saves bigger headaches down the track.

Does the 2012 Bego have a separate, replaceable TPS?

No. On the 2012 Daihatsu Bego the throttle position sensing is integrated into the electronic throttle body. If the sensor fails electrically or goes out of calibration, the remedy is to replace the complete throttle body assembly and carry out a relearn.

What fault codes point to TPS issues on this model?

Common codes include P0120–P0124 (throttle/pedal position circuit range/performance), P0220 series codes, and P2135 (throttle/pedal position sensor correlation). If these appear with symptoms like limp mode or rough idle, check wiring and throttle cleanliness first, then evaluate the throttle body.

Can cleaning fix TPS problems, or is replacement the only option?

If the issue is sticking from carbon build‑up, a careful throttle body clean and a relearn often restores smooth operation. If the ECU flags correlation or circuit faults that persist after cleaning and wiring checks, the integrated sensor is usually considered faulty and the throttle body should be replaced.