Parts for your 2004 Toyota Land cruiser-Throttle position sensors

2004 Toyota Land Cruiser throttle position sensor (TPS) — what it does and how to look after it

Based on Toyota’s factory service information for the 2004 Land Cruiser 100 Series (Engine Control – ETCS‑i sections) and the Toyota Electrical Wiring Diagram (EWD) for that year, a throttle position sensor is fitted. The 2UZ‑FE 4.7L petrol uses dual TPS tracks built into the electronic throttle body, while the 1HD‑FTE 4.2L turbo‑diesel uses a throttle valve position sensor for air management alongside an accelerator pedal position sensor. Toyota’s OBD‑II diagnostics for this model include TPS‑related DTCs (P0120–P0123, P0220–P0223), and the parts catalog lists the throttle body assembly with integrated sensors. So yes, the TPS is relevant and used on the 2004 Land Cruiser.

On a 2004 Land Cruiser, the TPS tells the engine ECU exactly how far the throttle plate is open. That helps the vehicle dose fuel, spark timing and idle air properly, smooth out gear changes on autos, and keep traction and cruise control happy. With Toyota’s ETCS‑i setup, there are two sensor tracks for redundancy, so the ECU can cross‑check the signal and keep things safe if one track misbehaves.

There’s no strict replacement interval for a TPS, but it’s smart to include a quick check during routine servicing. Under the bonnet, look for cracked wiring insulation at the throttle body, loose connectors, or any greenish corrosion. A gentle throttle body clean can help, but avoid drowning the sensor area in solvent. On the 2UZ‑FE, the TPS is integral and not adjustable—if it’s faulty, the fix is usually a new throttle body or sensor assembly as specified for your variant.

When diagnosing, a scan tool is gold. The TPS signals should move smoothly from closed throttle to wide open with no flat spots. Expect roughly 0.5–0.9 V at closed throttle and up near 3.7–4.5 V at full throttle, with both tracks agreeing. Tell‑tale signs of trouble include laggy throttle response, hunting idle, poor fuel economy, harsh or flaring shifts, limp‑home mode, and warning lamps for the engine or stability systems.

If replacement is on the cards, go for genuine or proven OE‑quality parts. Fitment is straightforward but do disconnect the battery, keep the area clean, and torque fasteners evenly. After installation, carry out an ETCS/throttle relearn (via a scan tool or the prescribed key‑on procedure) so the ECU resets its learned values. Clear any fault codes, then take the Cruiser for a relaxed test drive to confirm smooth throttle and tidy gear changes.

• Add a TPS/throttle body visual check to each service (about every 10,000–15,000 km).
• Only replace once you’ve proven the fault—many original units go well past 200,000 km.
• Record live data before and after work, it saves guesswork later.

Popular questions about 2004 Toyota Land Cruiser TPS

Does a 2004 Land Cruiser actually have a TPS?
Yes. The 2UZ‑FE petrol uses dual TPS sensors inside the electronic throttle body. The 1HD‑FTE diesel uses a throttle valve position sensor for air management and an accelerator pedal position sensor. Both are monitored by the ECU and will log TPS‑style fault codes if signals are out of range.

What fault codes and symptoms point to a TPS issue?
Common codes include P0120–P0123 and P0220–P0223. Drivers may notice hesitant take‑off, erratic idle, poor fuel economy, unexpected limp mode, or warning lamps for engine and traction systems. On autos, shift quality can go off because the ECU relies on TPS data.

Can the TPS be adjusted or just cleaned?
On the 2UZ‑FE, the TPS is non‑adjustable and usually part of the throttle body. Cleaning the throttle bore helps sticky idle issues, but avoid soaking the sensor. If testing shows a bad signal or mismatch between sensor tracks, replacement and an ECU throttle relearn are the go.