Parts for your 2008 Toyota Blade-Throttle position sensors

2008 Toyota Blade throttle position sensors: what they do and how to look after them

Technical references confirm the 2008 Toyota Blade does use a throttle position sensor (TPS). Toyota’s ETCS‑i (Electronic Throttle Control System – intelligent) for the 2AZ‑FE 2.4‑litre and 2GR‑FE 3.5‑litre engines specifies a throttle position sensor built into the electronic throttle body, and the factory diagnostics list TPS‑related DTCs (P0120–P0124/P0220–P0223). Toyota repair manuals and the electronic parts catalogue show the sensor as part of the throttle body assembly rather than a separate bolt‑on unit. So, on a 2008 Toyota Blade, the throttle‑position‑sensor is not only relevant—it’s integral to the throttle body.

On this model, the TPS tells the engine ECU exactly where the throttle plate sits, working alongside the accelerator pedal position sensor. That live angle feedback helps the ECU manage idle stability, smooth take‑off, cruise control, emissions, and traction/stability interventions. If it goes out of range, the car can drop into limp mode, surge at light throttle, idle roughly, use more fuel, or light the MIL.

Servicing the 2008‑Toyota‑Blade throttle‑position‑sensors is really about caring for the throttle body assembly, because the TPS isn’t separately serviceable from the factory. A good workshop will:

• Inspect the throttle body and connector at regular services, especially past 100,000 km.
• Clean the throttle bore and plate with throttle‑safe cleaner every 40,000–60,000 km, without forcing the butterfly by hand.
• Check loom condition and connector pins for corrosion or moisture under the bonnet.

If replacement is needed, the fix is to fit a complete throttle body assembly with a new gasket. Typical steps include disconnecting the battery, removing the intake duct, unplugging the throttle connector (and coolant hoses if fitted), swapping the unit, then refitting and evenly tightening the fasteners. After installation, the ECU needs an idle/throttle learn—either with a scan tool (Techstream) or a basic procedure: warm the engine, A/C off, and let it idle undisturbed for several minutes. That lets the ECU relearn the throttle stop and idle air control strategy.

For Blade owners around Australia and New Zealand, a tidy throttle body keeps drivability crisp and fuel use in check. If the MIL comes on with codes like P0120–P0124 or there’s a weird flat spot at light throttle, it’s worth booking in for a proper diagnostic before it turns into a bigger headache.

Popular questions

Does the 2008 Toyota Blade have a separate throttle position sensor?
It’s built into the electronic throttle body on both the 2AZ‑FE and 2GR‑FE. That means the throttle‑position‑sensor isn’t replaced on its own, the whole throttle body is swapped if the sensor fails or drifts out of spec.

How often should the throttle body/TPS be serviced on a Blade?
There’s no fixed interval in the logbook just for the TPS, but cleaning the throttle body every 40,000–60,000 km is a smart preventative. It helps avoid sticky throttle behaviour and keeps the sensor feedback stable. Add an inspection any time the MIL pops up with throttle‑related codes.

What are the signs the TPS is on the way out?
Common give‑aways include erratic idle, hesitation on light throttle, poor economy, and a Check Engine Light. Scan results may show TPS correlation or range/performance faults. If cleaning and wiring checks don’t sort it, plan for a throttle body replacement and an idle relearn.