Parts for your 2017 Mitsubishi Asx-Throttle position sensors

2017 Mitsubishi ASX throttle position sensors (TPS)

Based on technical references including the Mitsubishi Motors service manual for the 4B11/4N14 engines (Electronic Throttle Control section), the Mitsubishi ASA electronic parts catalogue, and independent data such as Autodata/AllData diagnostic charts for the 2017 ASX/Outlander Sport/RVR, the 2017 Mitsubishi ASX does use throttle position sensors. They’re built into the electronic throttle body as dual redundant sensors and are not a separately serviceable bolt-on switch like older cable-throttle setups. The accelerator pedal also has its own position sensors. If the ECU can’t trust any of these signals, it logs TPS/AP sensor DTCs and may drop the vehicle into limp mode.

On this ASX, the TPS lives inside the throttle body alongside the throttle actuator motor. Its job is to tell the ECU exactly where the throttle plate is at all times. The ECU cross-checks that against the accelerator pedal position, engine load and airflow so it can meter fuel, spark and idle speed. That’s why a flaky TPS can show up as rough idle, surging, poor fuel economy, hesitation off the line, cruise-control dropouts or a glowing check engine light.

Because the TPS is integrated, replacement usually means fitting a complete throttle body assembly. Good practice is to confirm the fault first: scan for codes (common ones are P0121–P0123/P0221–P0223 or correlation codes), watch live data for TPS and pedal tracking, and check the wiring and connectors for corrosion or chafing. If the throttle plate is sticking, a careful clean of the throttle bore and blade with throttle-body-safe cleaner can help drivability, but it won’t fix an internal sensor fault.

When replacing the throttle body, use a new gasket or O-ring as applicable, and tighten fasteners to factory spec. After refit, perform a throttle/idle learn with a scan tool (MUT-III or equivalent). Some vehicles will self-learn after a warm-up and idle period, but a proper adaptation routine avoids high or unstable idle. If the battery has been disconnected, expect a brief relearn period.

During routine servicing, a quick visual on the throttle body and harness, checking for oil vapour build-up, and verifying stable idle speed is worthwhile. Many workshops combine throttle cleaning with intake and PCV checks every 40–60,000 km. If the vehicle shows sensor-related faults, test both the throttle body TPS and the accelerator pedal sensor—both are part of the same electronic throttle control strategy noted in Mitsubishi’s workshop documentation.

It’s worth noting the 2.2‑litre diesel ASX also uses an electronically controlled throttle/intake air control valve with position feedback for EGR and shutdown smoothness, so similar diagnostics apply.

• Common signs: erratic idle, hesitation, limp mode, poor fuel use, check engine light
• Service tip: clean the throttle bore carefully, avoid soaking the actuator or sensor
• After work: carry out throttle/idle learn with a scan tool

Popular questions

Does a 2017 Mitsubishi ASX have a separate, replaceable TPS?
Not as a standalone part. Technical sources show the TPS is integrated into the electronic throttle body with dual sensors. If the sensor fails, the usual fix is replacing the complete throttle body, then performing an adaptation/idle learn.

What symptoms point to a bad TPS or throttle body on a 2017 ASX?
Drivers often report surging, flat spots on acceleration, unstable idle, higher fuel use, cruise issues and a check engine light. Scan-tool data may show mismatched throttle and pedal signals, and the ECU can trigger limp mode to protect the engine.

Can cleaning the throttle body fix TPS faults?
Cleaning can improve a sticky throttle plate and smooth out idle or tip-in if there’s carbon or oil film. It won’t repair a faulty internal position sensor. If codes persist after a clean and wiring check, plan for a throttle body replacement and relearn.