Parts for your 2010 Daihatsu Bego-Temperature sensors

2010 Daihatsu Bego Temperature Sensors — Purpose, Service Advice and Common Faults

Based on the Daihatsu J200/J210 workshop manual for the 3SZ‑VE engine and the Toyota Rush/Bego EFI and wiring diagrams, the 2010 Daihatsu Bego definitely uses temperature sensors. Key items include the Engine Coolant Temperature (ECT) sensor and an Intake Air Temperature (IAT) sensor (often built into the mass air flow unit). These are core to engine management and diagnostics, with standard OBD‑II coverage (e.g., P0115–P0119 for ECT and P0110–P0113 for IAT) noted in Denso EFI documentation for this platform.

On the 2010 Bego, the temperature sensors do a lot of heavy lifting behind the scenes. The ECT sensor, screwed into the coolant passage near the thermostat housing, tells the ECU exactly how hot the engine is. That data steers cold‑start enrichment, idle speed, ignition timing and when the radiator fans kick in, helping fuel economy and keeping the engine happy on scorching Aussie and Kiwi days. The IAT sensor, typically integrated into the airflow meter, tracks the temperature of the air coming into the engine so the ECU can fine‑tune fuelling as air density changes with weather and altitude.

They’re not “service items” in the same way as oil or filters, but they should be checked whenever cooling system work is done or when chasing rough running, poor fuel economy, hard cold starts or fans running constantly. During routine coolant changes, it’s worth a quick look for green crust on the ECT connector, brittle wiring, or seepage around the sensor body. On scan tools, a healthy ECT should read close to ambient before start, then climb smoothly to normal operating temperature (roughly mid‑80s to mid‑90s °C) without spikes.

• Common symptoms of a failing ECT/IAT:
  • Hard cold starts, black exhaust smoke, or a rich fuel smell
  • Cooling fans stuck on or never coming on
  • Erratic temperature gauge or sudden drops/rises in live data
  • AC performance quirks and higher fuel use around town

If replacement’s on the cards, let the engine cool fully, disconnect the battery, and drain a little coolant to drop the level below the sensor. Unplug the connector, swap the sensor and sealing washer if fitted, and tighten to factory spec (don’t overdo it—stripping alloy threads is a costly mistake). Refill with the correct long‑life coolant, bleed air properly, clear any codes and confirm temps on a scan tool. For the IAT, ensure the air box and ducting are sealed, and the MAF/IAT element is clean with approved cleaner only. Look after these little sensors and the Bego will return the favour with smooth, efficient running all year round.

• Where is the coolant temperature sensor on a 2010 Daihatsu Bego?
• What are the signs a Bego temperature sensor is failing?
• Does the 2010 Bego have more than one temperature sensor?

Where is the coolant temperature sensor on a 2010 Daihatsu Bego?
It’s mounted in the coolant passage near the thermostat housing on the 3SZ‑VE engine, facing the front side of the head. You’ll see a two‑pin connector. Access is usually from the top with the intake snorkel out of the way.

If unsure, follow the upper radiator hose to the thermostat housing