Parts for your 2008 Toyota Hilux-Throttle position sensors

2008 Toyota Hilux throttle position sensor (TPS)

Based on Toyota service literature and training texts (Toyota Hilux 2005–2011 Repair Manual, Engine Control – ETCS-i, Toyota New Car Features for 2TR‑FE, 1GR‑FE and 1KD‑FTV, and Denso/Autodata wiring and diagnostics), the 2008 Toyota Hilux does use throttle position sensing. Petrol variants (2.7L 2TR‑FE and 4.0L 1GR‑FE) run electronic throttle control with a dual-track TPS built into the throttle body. The 1KD‑FTV common‑rail diesel uses an electronically actuated throttle valve with an integrated position sensor to manage EGR flow and smooth shutdown. So TPS is relevant and fitted on this model.

On a 2008 Hilux, the throttle position sensor tells the engine ECU exactly how far the throttle plate is open. On the petrol engines it’s crucial for fuelling, ignition timing, idle control, and smooth shifts in autos. On the 1KD diesel, the sensor feeds back throttle plate angle so the ECU can blend EGR correctly, reduce intake roar, and prevent shudder on shutdown—diesels don’t meter air the same way as petrols, but the position feedback is still key.

Because Toyota integrates the TPS into the throttle body on most 2008 Hilux variants, it’s generally replaced as a complete throttle body (petrol) or throttle valve assembly (diesel). During servicing, a few simple checks go a long way:

• Scan live data for Throttle Position (%) and Accelerator Pedal Position (%) to confirm smooth, matching movement with no dead spots.
• Look for stored DTCs like P0120–P0123, P0220 or P2135. These often point to sensor range or correlation faults.
• Inspect the connector for green corrosion and the loom for rub-through near the throttle body—very common on vehicles that see corrugations and off‑road use.
• Clean the throttle bore and plate with proper throttle body cleaner. Don’t force the plate, and don’t flood the motor housing. On diesels, be extra gentle—its job is mostly EGR control.

If replacement’s needed, disconnect the battery, remove the intake duct, unplug the connector and vacuum hoses (if fitted), then unbolt the unit. Fit a new gasket, reinstall, and tighten to the factory spec from the workshop manual. After refitting, clear codes and perform a throttle/idle relearn. Petrol models will generally relearn after a warm idle drive cycle, diesels may require a throttle valve initialisation with a scan tool (Toyota Techstream or equivalent) for crisp response and stable EGR control.

Signs the TPS/throttle body is on the way out include erratic idle, surging at light throttle, flat spots, cruise control dropping out, poor fuel economy, or the MIL on. Catching it early keeps the Hilux driving nicely and saves a bunch of time chasing intermittent faults across long kilometres.

Does a 2008 Hilux diesel have a TPS, or is it only on petrol models?

Both do. Petrol engines have a dual-track TPS built into the electronic throttle body. The 1KD‑FTV diesel has an electronically controlled throttle valve with its own position sensor. On the diesel it’s mainly for EGR control and smooth shutdown rather than air metering like a petrol.

What fault codes point to a TPS issue on a 2008 Hilux?

Common codes include P0120–P0123 (TPS circuit range/performance), P0220 (secondary TPS) and P2135 (throttle/pedal correlation). You might also see throttle actuator codes on diesels if the plate can’t reach its target. Always check wiring and connectors before condemning the unit.

Can the TPS be cleaned, or does it need replacement?

The sensor itself is sealed, cleaning won’t repair an internal fault. You can safely clean carbon from the throttle bore and plate, which often improves idle quality. If the sensor tracks are worn or the ECU flags persistent range/correlation faults, replace the throttle body (petrol) or throttle valve assembly (diesel) and carry out the relearn/initialisation.