Parts for your 2021 Mitsubishi Eclipse cross-Temperature sensors

2021 Mitsubishi Eclipse Cross temperature-sensors

Temperature-sensors are absolutely fitted to the 2021 Mitsubishi Eclipse Cross. Technical references such as the Mitsubishi Motors Workshop Manual for MY2021 (engine electrical and HVAC sections) describe the Engine Coolant Temperature (ECT) sensor, Intake Air Temperature (IAT) sensing, and evaporator temperature control. The Mitsubishi ASA parts catalogue also lists an ambient temperature sensor in the front bumper and a CVT fluid temperature sensor for the INVECS-III transmission. Factory DTC coverage for codes like P0115–P0119 (ECT circuit) further confirms their presence and importance.

On this turbo 1.5L Eclipse Cross, temperature-sensors help the car warm up cleanly, run efficiently, and protect major components. The ECT sensor tells the ECU how warm the engine is so it can adjust fuel and ignition. IAT informs charge temperature for proper fuelling and knock control. The ambient and evaporator sensors steer the climate control, and the CVT fluid temperature sensor safeguards the transmission by managing line pressure and shift strategy.

• Engine Coolant Temperature (ECT): near the thermostat housing, drives warm-up fuelling, fan control and gauge.
• Intake Air Temperature (IAT): integrated with the MAP sensor, fine-tunes mixture and turbo response.
• Ambient Temperature: in the grille/bumper, feeds the dash display and HVAC.
• A/C Evaporator Temperature: on the HVAC case, prevents evaporator icing.
• CVT Fluid Temperature: internal to the transmission, protects the INVECS-III CVT.

These aren’t routine “replace-by-kilometres” items, but they should be checked during servicing if there are symptoms like hard cold starts, rich running, the radiator fan stuck on, erratic A/C, odd outside-temp readings, poor economy, or CVT limp mode. A quick scan-tool check under the bonnet is gold: ECT should read ambient when cold and typically stabilise around 85–95°C once hot, IAT should be close to ambient on a cold start.

If an ECT fails, replacement is straightforward for a pro: cool the engine, relieve pressure, disconnect the plug, swap the sensor and sealing washer, refill and bleed coolant, then clear codes and verify live data. Ambient and evaporator sensors are also serviceable, while the CVT temp sensor is internal and addressed with transmission work if diagnostics point there.

To keep things sweet, stick with quality OEM-equivalent sensors, ensure coolant is fresh and correctly mixed as per the service schedule, and keep connectors clean and loom routing tidy. A proper scan and visual check during regular servicing can save bigger headaches down the track.

Popular questions

How many temperature-sensors are on a 2021 Eclipse Cross?
There are several: the engine coolant temperature sensor, intake air temperature sensing (within the MAP assembly), an ambient temperature sensor up front, an A/C evaporator temperature sensor, and a CVT fluid temperature sensor. Exact count can vary slightly by market and spec, but these core sensors are typical for MY2021.

What symptoms point to a bad ECT sensor on this model?
Common signs include hard cold starts, high idle, black smoke or heavy fuel use, radiator fans running when the engine’s cold, a wandering temp gauge, and codes like P0115–P0119. Live data will often show implausible coolant readings (e.g., stuck at -40°C or 130°C).

Does the CVT have a temperature sensor and does it need maintenance?
Yes, the INVECS-III CVT monitors fluid temperature internally. The sensor itself isn’t a maintenance item, but clean, correct CVT fluid and cooling system health are essential. If the sensor reports over-temp, the CVT may limit performance to protect itself—diagnose with a scan tool before assuming hardware failure.