Parts for your 2007 Nissan Dualis-Temperature sensors

2007 Nissan Dualis (J10) Temperature Sensors — Purpose, Care, and When to Replace

Temperature sensors are absolutely fitted and relevant on the 2007 Nissan Dualis (J10). Technical references include the Nissan J10 Factory Service Manual (2007): EC section (Engine Coolant Temperature sensor and Intake Air Temperature within the MAF), HAC section (ambient and evaporator temperature sensors for climate control), MWI section (outside temperature to the combination meter), and TM section (CVT fluid temperature monitoring by the transmission control module). These sources confirm multiple temperature inputs are used throughout the vehicle’s engine, transmission, and climate systems.

On a Dualis, temperature sensors help the car warm up cleanly, manage fuelling and ignition timing, switch radiator fans on at the right moment, protect the CVT from heat, and keep the air-con working sweet as. The engine coolant temperature (ECT) sensor is the big one for drivability, while intake air temperature (IAT) is built into the MAF to fine-tune air-fuel mix. The HVAC relies on ambient and evaporator sensors, and the TCM tracks CVT fluid temp to avoid overheating.

They’re not usually a routine replacement item, but they do deserve checks during servicing. A quick scan of live data tells the story:

• Cold start: ECT and IAT should read close to outside ambient.
• At operating temp: ECT typically stabilises around normal operating range, fans cycle on/off.
• Ambient/evaporator readings should be plausible and stable for A/C performance.

Common signs something’s off include hard cold starts, rich fuel smell, uneven idle, fans running constantly, dodgy economy, weak A/C, or CVT going into protection. DTCs such as P0115–P0119 (ECT) or P0110–P0114 (IAT) are your cues.

ECT sensor replacement on the MR20DE is straightforward for most technicians: let the engine cool, relieve any cooling system pressure, drain enough coolant, disconnect the two-pin plug, swap the sensor (with its seal/O-ring as specified), refill and bleed the cooling system, then clear codes and verify live data. Avoid sealants that could insulate the sensor unless the service manual calls for it.

For the IAT, because it’s part of the MAF assembly, start with proper MAF cleaning (sensor-safe cleaner only) and air-leak checks, if failed, replace the MAF unit. Ambient and evaporator sensors are usually simple to access (grille area and HVAC case), but A/C diagnosis may be required. The CVT fluid temperature sensor is internal and not serviced separately, if temp-related codes appear, inspect CVT fluid level/condition, cooler operation, and follow Nissan’s CVT service procedures.

Good practice at every service: run a scan-tool health check, inspect connectors and wiring looms for brittleness or corrosion, and keep coolant and filters fresh per Nissan’s maintenance schedule.

Popular questions about 2007 Nissan Dualis temperature sensors

Where is the engine coolant temperature sensor located?
The ECT sensor on the MR20DE in the Dualis is typically mounted near the thermostat housing on the engine, with a two-pin connector. It’s accessible with basic hand tools. Always confirm exact location and any special steps in the Nissan J10 Factory Service Manual before starting.

Can a faulty temperature sensor cause poor fuel economy or hard starting?
Yes. If the ECT reads colder than reality, the ECM enriches the mixture, increasing fuel use and causing rough running. If it reads too hot, the engine may stumble or crank longer on cold mornings. Live data and DTCs will quickly point you in the right direction.

Do I need to program anything after replacing the ECT or MAF/IAT?
No coding is typically required for the ECT. Clear codes and verify readings. After MAF/IAT replacement, it’s wise to perform an ECM reset/idle learn with a scan tool so the ECM can settle back into correct airflow values.