Parts for your 2009 Toyota Blade-Temperature sensors

2009 Toyota Blade temperature sensors — what’s fitted and why it matters

Based on technical sources such as Toyota’s Repair Manual and New Car Features for the E150 platform, plus the Toyota Electrical Wiring Diagram, the 2009 Toyota Blade (2AZ‑FE 2.4L and 2GR‑FE 3.5L) is equipped with multiple temperature sensors. These include the Engine Coolant Temperature (ECT) sensor used by the SFI/ECM (DTCs P0115–P0119 referenced in Toyota diagnostics), the Intake Air Temperature (IAT) sensor (often integrated in the MAF, DTCs P0110–P0113), the ambient air temperature sensor for the automatic air conditioning, and transmission fluid temperature sensing used by the auto trans control. So, yes—temperature sensors are absolutely present and relevant on a 2009 Toyota Blade.

On this model, temperature sensors quietly keep everything humming along. The ECT sensor tells the engine computer how warm the engine is, so it can sort out cold-start fuelling, idle speed, ignition timing, VVT‑i behaviour and when to switch the radiator fans on. The IAT sensor tracks the temperature of the air coming into the engine, helping the ECM fine‑tune mixture for Aussie and Kiwi conditions—hot days, cool nights, and everything between. The ambient sensor feeds the climate control so Auto A/C feels natural, while transmission temperature input helps the gearbox choose smooth, sensible shift points and protect itself when things get hot.

For servicing, temperature sensors don’t usually need routine replacement, but a quick health check is smart. A scan tool readout of ECT and IAT at key-on, cold, should be close to the actual outside temp, once warmed up, expect ECT to sit near thermostat temperature. If readings look odd or jumpy, test the ECT off-car with a multimeter—typical Toyota NTC values are roughly 2–3 kΩ at 20°C and about 300–400 Ω at 80°C. The IAT, often part of the MAF on the Blade, benefits from a light clean with MAF‑safe spray, avoid touching the element.

• Typical symptoms of a crook temp sensor: hard cold starts, rough idle, rich running, poor fuel economy, radiator fans running when they shouldn’t, or a “check engine” light with P0115–P0119 (ECT) or P0110–P0113 (IAT).
• ECT replacement tips: let the engine cool, depressurise the cooling system, unplug the connector, swap the sensor on the water outlet/thermostat housing (location varies by 2AZ‑FE vs 2GR‑FE), fit a new washer if specified, refill with Toyota Super Long Life Coolant (pink), and bleed air properly.
• IAT/MAF care: inspect the connector, ensure no intake leaks post‑MAF, and only use proper MAF cleaner.

A quick check of these 2009toyotablade temperaturesensors during regular servicing helps prevent nuisance faults, protects the engine and transmission, and keeps climate control feeling spot‑on.

Popular questions

Where is the engine coolant temperature sensor on a 2009 Toyota Blade?

On the 2AZ‑FE 2.4L, it’s typically threaded into the water outlet/thermostat housing near the cylinder head. On the 2GR‑FE 3.5L, it’s mounted on the water outlet assembly at the front bank area. Access usually requires removing the engine cover and working from the top, always start with a cool engine.

What are the signs a temp sensor is failing on a Blade?

Common giveaways include long cranking when cold, uneven idle, higher fuel use, fans running at odd times, poor A/C behaviour, and a check engine light. Scan tool data that doesn’t match actual ambient or coolant temperature is a strong clue.

Does the Blade have an ambient temperature sensor for the A/C?

Yes. The ambient sensor sits behind the grille area and feeds the auto climate control and the outside temperature display. If it’s faulty or knocked out of place, the A/C may cool or heat oddly because it’s getting the wrong outside temp reading.