Parts for your 2015 Suzuki Splash-Temperature sensors

2015 Suzuki Splash temperature sensors — what they do and how to look after them

Temperature sensors are absolutely used on the 2015 Suzuki Splash. Suzuki’s own workshop literature for the K12B engine, along with the Suzuki electronic parts catalogue and common OBD‑II diagnostic references, list an engine coolant temperature (ECT) sensor, intake air temperature (IAT) monitoring, and cabin/ambient temperature sensing for HVAC on this model. These sources make it clear the Splash relies on multiple temperature inputs for engine management, cooling fan control, and air‑conditioning performance.

On this Splash, the ECT sensor is the star player. It feeds the engine control module precise coolant temperature data so fuelling, ignition timing, idle speed, and variable cooling fan strategies are all on the money from cold start to motorway cruise. The IAT reading helps dial in the air–fuel mixture as conditions change, while ambient and evaporator temperature sensors keep the climate control behaving properly and prevent evaporator icing. If fitted with an automatic, the transmission may also monitor fluid temperature to protect the gearbox.

These sensors aren’t routine “replace-at-X‑kilometres” items, they’re maintained by keeping the cooling system healthy and the wiring happy. During servicing, a technician should:

• Scan live data to confirm temperatures make sense (cold start near ambient, then rising smoothly to roughly 85–95°C under normal driving).
• Inspect the ECT sensor area for coolant stains or crusting, check the two‑pin connector for corrosion, and ensure harness routing isn’t rubbing through near the thermostat housing.
• Maintain correct coolant strength and change intervals as per the service schedule to prevent deposits on the sensor tip.

Replacement is straightforward when required (common triggers are fault codes like P0115–P0119, a fan that runs constantly, hard cold starts, or a dead gauge). Work on a cold engine, relieve system pressure, and be ready to catch a small amount of coolant. Fit an OEM‑quality sensor with a new sealing washer or O‑ring as specified, avoid thread sealant unless the manual calls for it. Tighten to the correct spec from the workshop manual, refill with the right long‑life coolant, bleed out air, and confirm with a scan tool that readings are stable. For the IAT, note that many Splash variants integrate this sensor into the MAF housing on the intake duct—cleaning the MAF/IAT element with proper cleaner can restore accuracy, otherwise replace the unit as an assembly. Done right, these small parts keep the Splash running sweet, sipping fuel, and staying cool under the bonnet.

Where is the engine coolant temperature sensor on a 2015 Suzuki Splash?

On K12B‑engined Splash models, the ECT sensor is typically threaded into the thermostat housing/water outlet at the side of the cylinder head, close to the upper radiator hose connection. It uses a two‑pin plug. Some market variants place it on the water outlet neck—either way it’s near the thermostat assembly and readily accessible from the top with basic hand tools.

Can a bad temperature sensor cause the radiator fan to run constantly?

Yes. If the ECT signal is missing or implausible, the engine computer often runs the fan as a failsafe to protect the engine. Drivers may also see a check engine light and codes like P0115–P0119. Restoring a clean, correct ECT signal usually returns the fan strategy to normal behaviour.

Does the Splash’s intake air temperature sensor come separately or with the MAF?

On many 2015 Splash variants the IAT is integrated into the MAF sensor on the intake duct, so it’s serviced as one unit. If the IAT reading is off, a proper MAF/IAT clean with the right spray can help, if not, replace the combined sensor assembly. Some markets did use a standalone IAT—check the specific vehicle’s parts listing to be sure.