Parts for your 2007 Nissan Serena-Temperature sensors

2007 Nissan Serena temperature sensors — what they do and how to look after them

Yes, the 2007 Nissan Serena absolutely uses temperature sensors. The C25-series Factory Service Manual (FSM) for the Serena outlines multiple temperature inputs across the vehicle: the engine coolant temperature (ECT) sensor in the Engine Control (EC) section, intake air temperature (IAT) sensor within the air flow meter, automatic air conditioner sensors (ambient and in-vehicle) in the HAC section, and a transmission fluid temperature sensor in the CVT control system (TM section). These are standard OBD‑II monitored items and relate to diagnostic codes such as P0115–P0119 (ECT circuit) and P0710 (transmission fluid temperature), per Nissan’s service literature and SAE J1979 practices.

On a 2007-nissan-serena, temperature sensors feed the ECU and control units info they need to manage fuelling, ignition timing, idle speed, cooling fans, CVT shift strategy, air‑con performance, and what’s shown on the dash gauge. They’re typically negative temperature coefficient (NTC) thermistors—tough little units, but they can drift with age, heat cycling, or coolant contamination.

• Engine Coolant Temperature (ECT): Governs cold starts, warm‑up enrichment, radiator fan operation, and gauge.
• Intake Air Temperature (IAT): Trims fuelling and spark based on air density.
• CVT Fluid Temperature: Protects the trans and manages shift/ratio strategy and limp mode.
• HVAC Ambient/In‑Vehicle Sensors: Optimise cabin temperature control and compressor logic.

They’re not a scheduled-replacement item, but they should be checked any time there’s cooling system work, poor fuel economy, odd fan behaviour, or a MIL on. A scan tool that shows live data is gold—compare ECT and IAT against a cold ambient reading after the Serena’s been parked overnight