Parts for your 2006 Toyota Wish-Temperature sensors

2006 Toyota Wish temperature sensors – what they do and how to look after them

Based on Toyota’s ANE10/ZNE10 series Repair Manual and Electrical Wiring Diagram, the 2006 Toyota Wish absolutely uses multiple temperature sensors. These include the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor, ambient air and A/C evaporator thermistors for climate control, and an automatic transmission fluid temperature sensor within the valve body on auto models. Toyota’s parts catalogues and Denso sensor specifications align with this, confirming the sensors are key inputs the ECU and A/C amplifier rely on.

On a 2006 Wish, temperature sensors are the quiet achievers that keep things smooth and efficient. The ECT sensor tells the engine computer how warm the engine is so it can sort cold-start enrichment, ignition timing and radiator fan control. The IAT sensor helps fine-tune fuel delivery for changing air temps. Climate-control thermistors keep cabin temps comfy without the fan going berserk, while the trans temp reading protects the gearbox and influences shift strategy. When any of these go out of range, the ECU can run rich, idle rough, or kick on the fans at odd times, and fuel economy can take a hit.

• Common signs a temp sensor is crook: hard cold starts, high idle when warm, black smoke or poor economy, random radiator fan operation, weak A/C performance, or the MIL on with codes like P0115–P0119 (ECT) or P0110–P0113 (IAT).
• Basic care: keep the cooling system healthy. Old coolant and corrosion can shorten an ECT sensor’s life. Replace coolant on schedule and fix leaks promptly.

When servicing, a quick scan-tool check of live data is gold. Compare indicated coolant temperature to reality at a cold start (should be close to ambient), and watch the reading climb smoothly as the engine warms. Any wild jumps or implausible numbers point to a dodgy sensor, wiring or ground. For climate complaints, confirm the A/C evap temp changes logically as the system runs.

Replacing an ECT or IAT sensor is usually straightforward. Disconnect the battery, let the engine cool, and use the correct deep socket. If the ECT uses a sealing washer, fit a new one and don’t use thread tape. Top up with Toyota Super Long Life Coolant and bleed air from the system. Clear codes and recheck live data. Stick with quality OEM or reputable aftermarket parts—cheap copies can be inaccurate and cause more grief.

Note: the auto trans temp sensor is internal, diagnosis is via scan data and DTCs. If it’s faulty, repair may involve valve body work rather than a quick external swap.

Does the 2006 Toyota Wish have more than one temperature sensor?
Yes. It typically has an engine coolant temp sensor, intake air temp sensor, ambient and A/C evaporator thermistors, and an automatic transmission fluid temp sensor on auto models. Each one feeds different control modules so the car can manage fuelling, cooling and cabin comfort properly.

How can someone tell if the ECT sensor is failing?
Look for hard cold starts, a high or hunting idle when warm, poor fuel economy, or radiator fans running when the engine’s cold. A scan tool that shows implausible coolant temperatures—like staying cold after several minutes—also points to an ECT issue. Fault codes P0115–P0119 are common when the circuit or sensor misbehaves.

When should temperature sensors be replaced on a Wish?
They’re not a routine interval item, replace when testing shows a fault, live data is erratic, or a relevant DTC sets. It’s smart to inspect and test sensors during cooling-system services, after overheating events, or when chasing rich running, poor starts or weak A/C performance.