Parts for your 2004 Suzuki Swift-Throttle position sensors

2004 Suzuki Swift throttle position sensor: is it used, what it does, and how to look after it

Yes, the 2004 Suzuki Swift uses a throttle position sensor (TPS). Suzuki’s factory service manual for RS413/RS415 models (M13A/M15A engines, circa 2000–2004) lists and tests a “TP sensor” on the throttle body, with OBD‑II fault codes P0120–P0123 associated with it. The Suzuki electronic parts catalogue also shows a discrete TPS for these engines, and independent data services such as Autodata and Bosch ESI reference its presence, location and diagnostics on 2004 Swift/Ignis variants. So it’s absolutely relevant on this model.

On the 2004 Swift, the throttle position sensor tells the engine control unit exactly how far the throttle plate is open. That live signal lets the ECU sort fuelling, ignition timing and gearshift behaviour (on autos) so the car feels peppy when asked and frugal when cruising. A healthy TPS is a quiet achiever—no flat spots, no stumbles, just smooth throttle response.

There’s no set replacement interval for a TPS, but it’s worth a check during routine servicing, especially if the Swift’s showing any of the following:

• Hesitation, surging, or a dead spot when taking off
• Erratic idle or stalling at lights
• Poor fuel economy and a lit check‑engine lamp (often P0120–P0123)

Quick driveway tips: make sure the connector is snug and clean, and the wiring isn’t chafed near the throttle body. Cleaning the throttle body bore and plate helps, but avoid soaking the TPS itself—most are sealed and don’t appreciate solvents.

If replacement’s needed, the Swift’s TPS is mounted on the side of the throttle body with two small screws. Disconnect the battery, unplug the sensor, swap it over, and nip the screws up gently—no need to go full gorilla with the spanner. Some versions are slotted for adjustment: with a scan tool, aim for a closed‑throttle reading near 0% (about 0.5 V), rising smoothly to 100% at full throttle. If you don’t have a scanner, this is a good job for a workshop to set accurately.

After fitting, clear any stored codes and perform an idle relearn if required by the ECU. A short test drive with some gentle and then firm throttle inputs will let the ECU trim itself and confirm the fix. Look after the basics—clean air filter, tidy wiring, sound grounds—and the TPS will get on with the job without any dramas.

Popular questions about 2004 Suzuki Swift throttle position sensors

What are the signs the TPS is failing on a 2004 Swift?

Common giveaways include a check‑engine light with codes like P0120–P0123, flat spots on acceleration, hunting or high idle, and poor fuel economy. If it worsens, it may stall when coming to a stop or surge at steady speeds.

Because these symptoms can overlap with vacuum leaks or a dirty throttle body, a quick scan‑tool check of TPS percentage and a visual inspection under the bonnet are wise before buying parts.

Can the TPS be cleaned or should it be replaced?

The sensor itself is a sealed unit and shouldn’t be soaked or sprayed internally. You can clean the throttle body to remove grime that upsets airflow, and you can clean the electrical connector. If the TPS shows dead spots or erratic readings, replacement is the reliable fix.

Does the ECU need a reset after TPS replacement?

It’s good practice to clear fault codes and perform an idle/ECU relearn if specified. Many shops simply disconnect the battery briefly, then run the engine at idle and take a short drive so the ECU can relearn throttle and fuel trims.