Parts for your 2018 Toyota Wish-Temperature sensors

2018 Toyota Wish temperature sensors — what they do and how to look after them

Based on Toyota technical literature, temperature sensors are absolutely fitted to the Toyota Wish platform used through 2017–2018 registrations. Toyota’s Repair Manual for the ZGE2# series (2ZR-FAE/3ZR-FAE engines) and New Car Features documentation describe the Engine Coolant Temperature (ECT) sensor and Intake Air Temperature (IAT) sensor as part of the SFI engine control. The Toyota A/C service manual also details ambient air and evaporator temperature sensors for HVAC operation. Common Toyota OBD-II diagnostics for this model family include ECT codes P0115–P0119 and IAT codes P0110–P0113, further confirming use of these sensors.

On a 2018 Toyota Wish, temperature sensors help the ECU and HVAC do their jobs properly. The ECT sensor tells the engine computer how hot the coolant is so it can set the fuel mix, ignition timing, cold-start enrichment and radiator fan operation. The IAT sensor reports how warm the incoming air is, which affects air density and fuel delivery. The transmission temperature sensor (auto models) helps the TCM protect the gearbox and manage shift quality. Upfront, the ambient and evaporator sensors let the climate control hold a steady cabin temp without fogging or icing.

• Engine Coolant Temperature (ECT): typically at the water outlet/thermostat housing.
• Intake Air Temperature (IAT): often integrated into the MAF on many ZGE2# variants.
• Automatic Transmission Fluid (ATF) temperature: inside the transmission.
• Ambient and evaporator temperature: for A/C performance and demist.

There’s no routine replacement interval for these sensors