Parts for your 2013 Toyota Hilux-Temperature sensors

2013 Toyota Hilux temperature sensors — purpose, care, and when to replace

Temperature sensors are absolutely fitted to the 2013 Toyota Hilux. Toyota’s Electrical Wiring Diagram for the 2013 Hilux (KUN/GGN series), the Toyota Repair Manual for 1KD-FTV/2TR-FE/1GR-FE engines, and Denso common-rail diesel documentation all show multiple temperature sensors in use: engine coolant temperature (ECT), intake air temperature (often built into the MAF), transmission fluid temperature for autos, diesel fuel temperature, and ambient air temperature for HVAC/cluster. Some diesel variants also use exhaust gas temperature sensing for protection and emissions calibration.

On a 2013 Hilux, these sensors let the ECU and other modules make smart calls. The ECT sensor helps manage cold starts, idle speed, fuelling, timing, radiator fan operation, and even A/C cut-in under load. The intake air temp sensor fine-tunes fuelling and boost control as air density changes. Auto models rely on transmission temperature to adjust shift strategy and protect the fluid. Diesel variants monitor fuel temperature to stabilise injection timing and quantity, and an ambient sensor drives the dash readout and HVAC logic. Where fitted, exhaust gas temp sensors keep the turbo and catalyst safe.

They’re not a routine replacement item, but they do benefit from simple, regular checks during servicing:

• Scan live data cold and hot. ECT should roughly match ambient before start, then climb smoothly. IAT should sit near ambient with the engine off.
• Inspect connectors under the bonnet for corrosion, oil wicking, broken locks, or hardened loom tape—common causes of dodgy readings.
• Keep coolant fresh and the system bled, old coolant or air pockets can make the ECT lie and trigger overcooling/overheating behaviour.
• On diesels, look over the fuel filter head and rail harness, disturbed wiring after filter changes can upset fuel temp readings.

Typical symptoms of a failing temp sensor include hard cold starts, rich running, thermo fan stuck on, high fuel use, lazy shifts (auto), or the A/C playing up. Relevant OBD-II codes include P0115–P0119 (ECT), P0110–P0114 (IAT), P0711 (ATF temp), and P0180 (fuel temp).

Replacing an ECT sensor is straightforward: let the engine cool, relieve system pressure, drain a touch of coolant, unplug the connector, and swap the sensor on the outlet/thermostat housing or cylinder head (location varies by engine). Don’t overtighten, and only use sealant if the service manual specifies it. Refill with the correct Toyota Super Long Life coolant, bleed properly, and verify readings with a scan tool. Sticking with genuine or quality OEM-equivalent sensors keeps the Hilux happy across Aussie and Kiwi conditions.

• Where are the temperature sensors on a 2013 Toyota Hilux?
  The coolant temp sensor sits on or near the thermostat housing or cylinder head. The intake air temp sensor is usually integrated into the MAF sensor at the airbox. The ambient air temp sensor lives ahead of the radiator support, where it can sample outside air.
• The automatic transmission fluid temp sensor is part of the internal transmission/valve body harness. On diesels, the fuel temp sensor is typically in the common-rail or fuel filter assembly. Some diesel variants may have exhaust gas temp sensors pre-turbo or along the exhaust for protection.
• What are the signs a Hilux coolant temperature sensor has failed?
  Cold starts that feel off, the radiator fan running when it shouldn’t, rich or thirsty fuel use, a high idle after warm-up, or erratic temp readings on a scan tool are common clues. The check engine light may appear with P0115–P0119.
• Before replacing the sensor, rule out poor grounds, low coolant, or a crusty connector. A quick live-data comparison to ambient when cold is a handy driveway test.
• Does a 2013 Hilux have a DPF temperature sensor?
  For Australia and New Zealand, most 2013 1KD-FTV Hilux models were pre-DPF, so they typically don’t have DPF temperature sensors. They may still use exhaust temp sensing for engine protection depending on build and calibration.
• Some markets and late-builds can differ. The best way to confirm is to check the VIN build data or inspect the exhaust for sensor bungs and wiring ahead of and behind any aftertreatment hardware.