Parts for your 2004 Toyota Hilux-Throttle position sensors

2004 Toyota Hilux throttle position sensor (TPS)

According to Toyota’s factory service information (TIS) for the 2004 Hilux petrol (e.g., 3RZ‑FE) and diesel (e.g., 1KZ‑TE, 5L‑E) engines, as well as the Toyota Electronic Parts Catalogue and common workshop references like Gregory’s Hilux 1997–2005 manual and Autodata, this model does use a throttle position signal. On petrol variants it’s a throttle position sensor on the throttle body, on electronically managed diesels it’s an accelerator/throttle position sensor on the pump lever or accelerator pedal that the ECU treats the same way. So a TPS (or equivalent accelerator position sensor) is very much relevant to the 2004 Hilux.

What does it do? The TPS lets the engine computer know how far the driver has opened the throttle. That signal shapes fuelling and ignition timing on petrol models, influences EGR and fuelling on diesels, and even affects auto transmission shift timing. A smooth, accurate TPS keeps throttle response crisp and fuel economy on point.

Common hints it’s unhappy include a hunting idle, flat spots on take‑off, poor fuel use, harsh or late shifts in autos, and a check‑engine light. On an OBD2 scan tool you’ll often see DTCs like P0120–P0123. Live data should show a clean sweep from roughly 0.5 V at closed throttle up to around 4.5 V at wide open without dropouts. Always rule out basics first: damaged wiring, loose earths, moisture in the connector, and a dirty or sticking throttle plate/cable under the bonnet.

Servicing and replacement are straightforward. On petrol cable‑throttle Hiluxes the TPS is usually adjustable. Mark the current position, remove the two screws, fit the new sensor, then rotate slightly to set a base voltage around the half‑volt mark at closed throttle (check the exact spec in TIS/Gregory’s for the engine code). Tighten the screws snug, clear any codes, and do a short drive so the ECU can relearn idle. On diesels with an accelerator position sensor, the unit is typically non‑adjustable—install, ensure the cable or pedal free play is correct per the manual, and perform any required zero‑point learning with a scan tool if specified.

Good upkeep goes a long way: keep the throttle body clean, ensure the cable isn’t frayed or binding, protect connectors with a dab of dielectric grease, and inspect the harness routing. As part of regular servicing, a quick TPS check every 40,000–60,000 kilometres—especially if drivability isn’t quite right—helps the 2004 Hilux stay the reliable workhorse it’s known to be.

• Quick checks: visual inspection, live‑data voltage sweep, gentle connector clean, and an idle relearn after work is done.

Does a 2004 Hilux have a throttle position sensor?

Yes. Toyota TIS and the Toyota EPC show a TPS on petrol engines and an accelerator/throttle position sensor on electronically managed diesels (functionally the same input to the ECU). Gregory’s and Autodata list test procedures for these sensors on 2004 Hilux models.

Where is the TPS on a 2004 Hilux?

On petrol variants it’s bolted to the throttle body on the intake. On many diesels of this era it’s mounted to the injection pump’s control lever, or it may be integrated at the accelerator pedal depending on the exact engine/market. Checking by engine code (3RZ‑FE, 1KZ‑TE, 5L‑E) in the EPC or TIS will pinpoint the exact spot.

How do you adjust or replace it?

For petrol cable‑throttle setups: mark the old position, swap the sensor, then rotate slightly to set the closed‑throttle voltage to spec and tighten. For diesel accelerator sensors: replace the unit, verify cable/pedal free play, and complete any zero‑point learning if the manual calls for it. Always clear fault codes and road‑test.