Parts for your 2010 Suzuki Sx4-Throttle position sensors

2010 Suzuki SX4 throttle-position-sensors: what they do and when to replace

Yes, the 2010 Suzuki SX4 uses a throttle-position-sensor (TPS). On this model it’s built into the electronic throttle body rather than being a separate bolt-on switch. This is documented in the 2010 Suzuki SX4 Service Manual’s Engine Control (EC) section describing the “throttle body with motor and TPS,” reflected in Suzuki’s Electronic Parts Catalogue, and supported by common OBD-II diagnostics for the SX4 (e.g., P0121, P0122, P0123, P2135) that specifically reference the throttle position signal. Whether the SX4 is running the J20B 2.0L or the M16A 1.6L, it uses drive-by-wire with internal dual TPS tracking the throttle plate.

On a 2010 SX4, the throttle-position-sensor tells the engine control module exactly how far the throttle plate is open, so fuel delivery and ignition timing can be matched to the driver’s right foot. Because it’s an electronic throttle, the ECM cross-checks the TPS signals with the accelerator-pedal position sensors for safety and smooth drivability. When the TPS signal goes flaky, you’ll often feel hesitation, erratic idle, poor fuel economy, or the car may drop into limp mode while lighting the MIL.

As the TPS is integrated, replacement usually means fitting a complete throttle body assembly. Before jumping to replacement, a smart bit of servicing can save time and coin:

• Inspect and clean: Remove the intake duct and gently clean the throttle bore and plate using proper throttle body cleaner (avoid harsh carb cleaners). Sticky deposits can upset the sensor feedback and throttle control.
• Check the plug and loom: Look for corrosion, moisture, or a loose connector. Give the pins a careful visual once-over and ensure the harness isn’t chafed.
• Scan before you spanner: Confirm fault codes and live data (both TPS tracks should move smoothly from about closed to wide open with no sudden jumps).

If the TPS data is erratic despite cleaning and the wiring checks out, replace the throttle body with a new gasket. Torque the fasteners to spec per the Suzuki manual and avoid overtightening the plastic connector. After refitting, perform a throttle/idle relearn. The SX4 will usually self-calibrate after key-on and a warm idle, but a scan-tool “throttle learn” command is best practice. Expect a brief unstable idle while it relearns, a short drive cycle with gentle throttle application helps it settle.

Routine maintenance tip: keep the air filter fresh and the intake sealed. Minimising dust and oil vapour build-up extends throttle body and TPS life, helping the SX4 run sweet as through the kilometres.

Popular questions about 2010 Suzuki SX4 throttle-position-sensors

Does the 2010 SX4 have a separate TPS I can replace on its own?
No—on this model the throttle-position-sensor is integrated into the electronic throttle body. If the TPS is faulty, the correct repair is to replace the throttle body assembly. This design improves reliability but means the sensor isn’t serviced as a stand-alone part.

What fault codes point to a bad TPS on a 2010 SX4?
Common SX4 codes include P0121 (TPS range/performance), P0122 (TPS low), P0123 (TPS high), and P2135 (throttle/pedal position correlation). Before replacing parts, verify with live data and check for wiring/connector issues and throttle plate contamination.

Do I need a relearn after replacing the throttle body on an SX4?
Yes. The ECM needs to relearn the throttle plate position. Often it will self-learn after key-on and a stable warm idle, but using a scan tool to run the throttle or idle learn procedure is recommended for a smooth result.