Parts for your 2004 Honda Fit-Throttle position sensors

2004 Honda Fit (GD) throttle-position-sensors: what they do and how to look after them

Yes, the 2004 Honda Fit (GD series, also sold as the Jazz in AU/NZ) uses throttle-position-sensors. Honda’s factory workshop literature for the GD1/GD3—Electronic Throttle Control System section in the Honda Jazz/Fit Service Manual—shows a motorised throttle body that integrates dual-track Throttle Position (TP) Sensor A/B. Honda’s diagnostic references list related OBD-II DTCs (for example P0121–P0123 and P0221–P0223) and advise checking TP Sensor A/B values with the Honda Diagnostic System. OEM parts catalogues for the GD Fit/Jazz further confirm the TP sensors are built into the throttle body assembly rather than being an external, adjustable item.

On this model, the throttle-position-sensors tell the engine control unit exactly how far the throttle plate is open. Because it’s drive‑by‑wire, there’s no cable from the pedal, instead, an accelerator pedal sensor reports the driver’s request and the throttle body’s TPS reports the actual plate position. The ECU constantly compares the two to keep throttle response smooth, fuel use tidy and emissions in check.

With age or contamination, the throttle body can gum up and the TP sensor signals can drift or go noisy. Typical clues include a hunting or high idle, flat spots on take‑off, poor economy, a stubborn check engine lamp, or the car dropping into limp mode. A quick scan will usually show mismatched TP Sensor A/B readings or one of the TP‑related fault codes.

There’s no scheduled replacement interval for the throttle-position-sensors on a 2004 Fit, they’re serviced as needed. On this generation, the sensors are integral to the throttle body, so replacement is normally a throttle body swap rather than a standalone sensor change. After any throttle body work, perform the throttle/idle learn procedure (Honda outlines this in the service manual and via HDS) so idle speed and response settle properly.

• Keep the intake clean: remove the throttle body and clean the bore and plate with a proper throttle cleaner—don’t drown the electronics and don’t force the plate by hand.
• Check live data: with a scan tool, confirm TP Sensor A/B agree through the pedal sweep and that percentages return to a steady 0–2% at closed throttle once warm.
• Fix air leaks first: split hoses or a leaky gasket can mimic a dodgy TPS with erratic idle behaviour.
• If replacing: use a quality throttle body assembly, new gasket, and complete the idle learn. Clear codes and road‑test over a few kilometres to confirm no hiccups.

Looked after this way, the GD Fit’s throttle-position-sensors will keep throttle feel crisp and reliable for many more kilometres under the bonnet.

Does a 2004 Honda Fit/Jazz definitely have a throttle-position-sensor?

It does. The GD-series throttle body contains dual TP sensors (A/B) as part of Honda’s Electronic Throttle Control. The factory service manual and OBD‑II diagnostics for this model list specific TP sensor checks and fault codes, so it’s absolutely a fitted component.

Can the TPS be replaced on its own, or does the whole throttle body need changing?

From the factory it’s supplied as part of the throttle body assembly and isn’t adjustable. Some aftermarket options sell a separate sensor, but the reliable fix most workshops choose is a complete throttle body, followed by throttle/idle learn.

What symptoms point to a failing TPS on a 2004 Fit?

Drivers often notice erratic idle, hesitation, poor fuel economy, a check engine light, or the car dropping into limp mode. Scanning will usually reveal TP Sensor A/B disagreement or codes like P0121–P0123/P0221–P0223. Always rule out intake air leaks and a dirty throttle first.