Parts for your 2018 Suzuki Splash-Throttle position sensors

2018 Suzuki Splash throttle-position-sensors (TPS): what they do and how to look after them

Based on Suzuki technical literature and parts catalogues for the Splash/Ritz with K-series petrol engines (K10B 1.0L and K12B 1.2L), a throttle position sensor is used on this model. The Suzuki Splash Service Manual’s Engine Control System section shows a throttle body that integrates a throttle position (TP) sensor—often dual-track in the drive-by-wire assembly—and the Suzuki Electronic Parts Catalogue lists the throttle body assembly with the TP sensor built-in, with related OBD-II fault codes P0120–P0124 documented. Although many Splash vehicles were built prior to 2015, those first registered in 2018 use the same engine management that relies on a TPS.

The throttle-position-sensor on a 2018 Suzuki Splash is the ECU’s window into how much the driver wants the engine to breathe. Mounted within the throttle body, it tracks the throttle plate angle and feeds that signal to the engine computer so it can sort fuel delivery, ignition timing and idle control. On drive-by-wire variants, the TPS works alongside the throttle actuator and pedal sensors, most units are dual-track for redundancy, helping the ECU enter limp-home mode if it detects a mismatch.

There’s no set replacement interval for the Splash’s TPS, it’s a “as-needed” item. Typical red flags include a check engine light with codes like P0120–P0124, erratic idle, flat spots on acceleration, stalling when coming to a stop, jumpy throttle response or poor fuel economy. Before swapping parts, it’s smart to scan live data (throttle opening angle %, APP correlation), check the harness for rub-through, and inspect the connector for moisture or green crust.

• Maintenance tips: keep the intake tract clean, inspect the air filter, and if cleaning the throttle, use a proper throttle-body cleaner sparingly. Avoid forcing the plate by hand with the ignition on. Don’t drown the electronic side of the housing in solvent.
• Replacement notes: on most Splash variants the throttle-position-sensor is integral to the throttle body, so the assembly is replaced as a unit. Fit a new gasket, tighten fasteners evenly, and clear codes.
• Relearn procedure: after replacement or a battery disconnect, perform the throttle/idle learn with a capable scan tool or the prescribed learn routine (warm the engine, let it idle undisturbed, key-cycle). This helps stabilise idle and tip-in.
• Workshop time: typically around 0.8–1.2 hours depending on access and whether a relearn is required.

Look after the electrics—solid battery voltage and clean grounds help TPS accuracy—and the Splash will feel crisp off the line and smooth through the revs, kilometre after kilometre.

Popular questions

Does a 2018 Suzuki Splash have a throttle-position-sensor?
Yes. Service manual diagrams for the K10B/K12B engines show a throttle body with an integrated TP sensor, and the diagnostic section lists TPS-related DTCs (P0120–P0124). Even late-registered Splash models use this setup.

Can the TPS be replaced separately on a Splash?
On most Australian and New Zealand market Splash variants, the TPS is part of the throttle body assembly and isn’t supplied separately. If the sensor is faulty, the usual fix is to replace the complete throttle body, fit a new gasket, and carry out a throttle/idle relearn.

What are the signs a Splash TPS is failing?
Common symptoms are a check engine light, surging or hunting idle, hesitation, sudden flat spots, poor fuel economy and throttle response that feels all over the shop. Confirm with a scan tool—look for erratic throttle angle readings or mismatch with accelerator pedal signals—and rule out wiring or connector issues before replacing parts.