Parts for your 2015 Toyota Wish-Temperature sensors

2015 Toyota Wish temperature-sensors — what they do and when to service them

Temperature-sensors are absolutely fitted to the 2015 Toyota Wish. Toyota’s service literature for the ZGE2# series (New Car Features, Electrical Wiring Diagram, and Repair Manual) details multiple thermistors, including the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor, ambient air sensor for the A/C, and an evaporator temperature sensor. The CVT likewise relies on a transmission fluid temperature input. These are also reflected in standard OBD‑II data items and fault codes (for example, P0115–P0119 for ECT, P0110–P0113 for IAT), consistent with Toyota diagnostics and SAE J1979. Denso’s thermistor specs used by Toyota align with the resistance‑versus‑temperature behaviour these systems expect.

On a 2015 Wish, temperature-sensors quietly keep everything sweet. The ECT sensor tells the engine ECU how hot the coolant is, so it can sort cold starts, fuel trims, ignition timing, idle speed and when to kick the radiator fans on. The IAT sensor helps with air‑density calculations for smoother response and better economy. The A/C sensors (ambient and evaporator) protect the system from icing and help the climate control hold a steady cabin temp. The CVT’s temperature input allows the transmission control to manage line pressure, shift feel and protective strategies when things get too hot or too cold.

When these sensors go out of whack, the Wish can be harder to start when cold, run rich, feel doughy, use more fuel, or run the fans when it really doesn’t need to. Climate control may cycle oddly or blow warm. The CVT can default to a protective mode and feel reluctant.

There’s no fixed replacement interval for temperature-sensors