Parts for your 2010 Toyota Wish-Temperature sensors

2010 Toyota Wish Temperature Sensors

Technical sources including Toyota’s ZGE20/ZGE21 series repair manuals and wiring diagrams (Engine Control System for 2ZR-FAE/3ZR-FAE, EWD) confirm the 2010 Toyota Wish is fitted with multiple temperature sensors. These include the engine coolant temperature (ECT) sensor (often labelled THW), the intake air temperature (IAT) sensor integrated in the MAF assembly, transmission fluid temperature sensors on applicable automatic models, and an ambient temperature sensor for the air conditioning system. Standard OBD‑II diagnostics for this model list DTCs such as P0115–P0119 and P0125 that specifically reference these sensors, further verifying their use on this vehicle.

On a 2010 Toyota Wish, temperature sensors are the quiet achievers that help the ECU keep everything sweet. The ECT sensor tells the engine computer how hot the coolant is so it can sort out cold-start enrichment, ignition timing, fan operation and even the thermostat-control logic in some strategies. The IAT sensor lets the ECU know how dense the incoming air is, trimming fuel to keep economy and emissions tidy. On automatic variants, the trans fluid temp sensor protects the gearbox and manages shift quality. The ambient sensor feeds the A/C logic so cabin temps don’t go feral when summer hits in Aus or NZ.

They’re not typically a scheduled replacement item, but they do deserve attention at service time. A quick visual once-over of connectors and wiring, checking for green crusties, oil wicking and brittle looms, goes a long way. If the dash gauge acts oddly, the radiator fans run flat-out, cold starts are grumpy, fuel use climbs, or shifts feel harsh, an ECT or other temp sensor might be the culprit. Scan-tool data is gold here: compare live coolant temp with a cold engine (should be close to ambient), watch warm-up behaviour, and confirm fan cut-in temps.

When replacement is needed, it’s straightforward but keep it tidy. Let the engine cool, depressurise the cooling system, and be ready with fresh Toyota Super Long Life Coolant (pink) to top up and bleed air. Use a quality OEM-equivalent sensor, a new sealing washer if specified, and follow torque guidance from the Toyota manual rather than over-tightening. For coastal cars, a dab of dielectric grease on connectors helps ward off corrosion. After fitting, clear codes, verify live data and confirm the radiator fans and thermostat behave as expected on a proper warm-up drive. Look after the 2010 Toyota Wish temperature sensors and the ECU will repay the favour with smooth manners, better economy and reliable cooling—whether it’s a frosty South Island morning or a steamy Brisbane arvo.

• Common symptoms of a dodgy temp sensor: hard cold starts, rough idle, rich running, fans stuck on/off, poor A/C performance, erratic gauge, harsh shifting on autos.
• Good practice: inspect connectors each service, keep coolant fresh and correct, and fix wiring chafe near the thermostat housing and radiator support.

Where is the engine coolant temperature sensor on a 2010 Toyota Wish?
On the ZGE20/ZGE21 Wish, the ECT sensor is threaded into the coolant passage near the thermostat housing on the cylinder head side of the engine. It sits close to the upper radiator hose area. Access is usually from the top with the intake duct removed, on some setups, reaching from the side is easier. Look for a two‑pin connector and a small brass sensor body.

What are the signs the ECT sensor has failed on a Wish?
Typical giveaways include crank-and-crank cold starts, rich exhaust smell, elevated fuel use, radiator fans running constantly or not at all, and a temperature gauge that reads abnormally. The ECU may log codes like P0115–P0119 or P0125. Live data that never rises from ambient or jumps erratically as the engine warms is a dead giveaway the sensor or its wiring is crook.

Does the 2010 Wish have more than one temperature sensor?
Yes. Besides the ECT, there’s an intake air temp sensor (within the MAF), an automatic trans fluid temperature sensor on auto models, and an ambient temperature sensor for climate control. Each serves a different system, so a fault in one doesn’t automatically condemn the others—scan data helps pinpoint which sensor is playing up.