Parts for your 2017 Toyota Wish-Temperature sensors

2017 Toyota Wish temperature sensors — what they do and how to look after them

Yes, temperature sensors are absolutely used on the 2017 Toyota Wish. Toyota’s Repair Manual for the ZGE2# series (2ZR-FAE/3ZR-FAE) and the 2017 Electrical Wiring Diagram identify multiple temperature inputs, including the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor (integrated into the MAF), outside ambient sensor, A/C evaporator thermistor, cabin thermistor for climate control, and the CVT fluid temperature sensor used by the transaxle ECU. Toyota’s parts catalogue for the Wish lists these sensors as serviceable items, confirming they’re fitted from factory.

On a 2017 Toyota Wish, these sensors quietly keep things running right under the bonnet and in the cabin. The ECT sensor is the big one for drivability—it tells the ECU how warm the engine is so it can fine-tune fuel and ignition, control cold-start enrichment, and command the radiator fans. The IAT sensor helps the ECU correct fuelling for hot or cold intake air. For comfort, the A/C system relies on the evaporator and cabin temperature sensors to avoid freezing the core and to keep the set temperature steady. The outside ambient sensor feeds the dash display and helps climate control logic. And in the CVT, fluid temperature is monitored to manage line pressure and shift strategy, especially on chilly mornings or in summer heat.

As part of routine servicing on a 2017 Toyota Wish, it’s smart to:

• Scan live data and check ECT and IAT readings are plausible from cold start to operating temp.
• Inspect connectors and looms for brittle clips, corrosion, or coolant/oil ingress.
• Keep coolant fresh and the system bled—air pockets can skew ECT readings.
• Confirm radiator fans cycle correctly and no DTCs like P0115–P0119 are stored.

Replacing an ECT sensor or similar? Work on a cold engine, release any pressure, and be ready to catch a little coolant. Swap the sensor with a new sealing washer, tighten to the specification in the Toyota Repair Manual, top up coolant, and bleed the system. After replacement, clear fault codes and verify with a scan tool that temperatures track smoothly as the engine warms. Always use quality, correct-spec parts (Denso/Toyota) to avoid flaky readings that can spike fuel use, cause rough idle, or kick the fans on when they’re not needed. If the CVT temp sensor is suspected, follow the transaxle diagnostic steps in the EWD and Repair Manual—that one’s best left to technicians with the right test gear.

• Common temperature sensors on a 2017 Wish: ECT, IAT (in MAF), outside ambient, A/C evaporator, cabin thermistor, and CVT fluid temperature.

Where is the engine coolant temperature sensor on a 2017 Toyota Wish?

On the 2ZR-FAE engine, the ECT sensor is threaded into the coolant outlet housing on the cylinder head side, near the thermostat area. It has a small 2‑pin connector and sits beneath the intake side of the engine. Access improves by removing the engine cover and working from the left-hand side of the bay.

Do new temperature sensors need calibration?

No special calibration is required. The ECU reads the thermistor’s resistance and adapts automatically. After fitting, clear any stored DTCs, bleed the cooling system if the ECT was replaced, and confirm stable readings with a scan tool.

What are the signs a temperature sensor is failing?

Expect hard cold starts, rich running, poor fuel economy, an erratic temp gauge, radiator fans running constantly, or A/C cutting in and out. The CVT may feel sluggish when hot if the trans fluid temp sensor is unhappy. Scan for codes like P0115–P0119 and compare temperature PIDs against actual conditions.