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Parts for your 2005 Toyota Highlander-Throttle position sensors
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2005 Toyota Highlander throttle‑position sensor: what it does and how to look after it
Based on Toyota factory repair information and the Toyota Electronic Parts Catalogue for the 2005 Highlander (ACU/MCU platform with 2AZ‑FE 2.4L and 3MZ‑FE 3.3L engines), this model uses Electronic Throttle Control (ETCS‑i). In that setup, a throttle‑position sensor (TPS) is absolutely present and it’s built into the electronic throttle body alongside the throttle actuator motor. It’s a non‑serviceable, non‑adjustable sensor assembly that the Engine Control Module (ECM) relies on to know exactly how far the throttle plate is open.
On this Highlander, the TPS has a simple job with big consequences: it tracks throttle angle so the ECM can blend fuel, spark and throttle motor commands for smooth take‑off, steady cruising and clean emissions. ETCS‑i systems use dual‑track sensors for redundancy, so the ECM can cross‑check signals for safety. That’s why erratic TPS data can trigger limp mode and warning lights.
When servicing, owners should know a few practical points drawn from Toyota service procedures:
- The TPS is integrated with the throttle body, you don’t adjust it, and on most variants you replace the throttle body assembly if the TPS fails.
- Typical symptoms of a failing TPS include hesitation, surging, stalling at idle, poor kick‑down, and codes such as P0120–P0123 or P2135.
- A dirty throttle bore can mimic TPS issues. Periodic cleaning of the throttle body (off‑car or with careful on‑car methods) can restore smooth idle. Avoid flooding the throttle with harsh cleaners and never force the plate by hand with the key on.
- After battery disconnect, throttle body cleaning, or throttle body replacement, perform an idle/ETCS relearn. A scan tool procedure is preferred, otherwise allow the engine to reach operating temp and idle undisturbed so the ECM can recalibrate.
- If replacement is required, use quality parts and new gasket, check for intake leaks, clear stored codes, and verify live data for both TPS tracks during a road test.
With regular servicing—clean air filter, healthy battery voltage, clean throttle bore—the TPS and throttle body on a Highlander typically go the distance for many hundreds of thousands of kilometres. When problems crop up, proper diagnosis with a scan tool before parts swapping will save time and money.
Popular questions
Where is the TPS on a 2005 Toyota Highlander?
It’s part of the electronic throttle body under the bonnet, mounted on the intake manifold. Unlike older cable‑throttle setups, it’s not a separate bolt‑on sensor, it’s integrated with the throttle motor and housing.
Can the TPS be replaced separately on this model?
On most 2005 Highlanders, no. Toyota’s service information and parts listings show the TPS as part of the throttle body assembly. If the sensor has failed, the usual remedy is to replace the complete throttle body, then carry out an idle/ETCS relearn.
Do I need to recalibrate after throttle body or battery work?
Yes. After cleaning or replacement, perform an idle relearn or ETCS initialization. A professional scan tool can command the procedure, otherwise, let the engine idle to operating temperature without loads so the ECM can relearn throttle and idle targets.
