Parts for your 2006 Honda Fit-Temperature sensors

2006 Honda Fit (Jazz) temperature sensors — what they do and how to look after them

Are temperature sensors used on a 2006 Honda Fit/Jazz? Yes. Honda’s own technical literature confirms multiple temperature sensors on this model. The Engine Coolant Temperature (ECT) sensor is documented in the Cooling System and PGM‑FI sections of the Honda Fit/Jazz Service Manual (GD platform, L15A engine). The Intake Air Temperature (IAT) sensor is covered in the PGM‑FI/Fuel & Emissions Systems section. AU/NZ CVT variants reference a transmission fluid temperature sensor in the Automatic Transmission/CVT section, and the Electrical Troubleshooting Manual shows the ECT-based radiator fan control strategy. These factory sources make it clear temperature sensors are integral to how the 2006 Fit/Jazz runs and protects itself.

On this car, temperature sensors talk constantly to the engine computer. The ECT sensor tracks coolant temperature so the ECU can sort out cold starts, fuel mixture, ignition timing and when to switch the radiator fans on. The IAT sensor helps the ECU judge air density for crisp throttle response and fuel economy. CVT-equipped AU/NZ cars use a fluid temperature input to manage shift strategy and line pressure. Climate control and A/C components also use temperature feedback to prevent icing and keep cabin temps steady.

There’s no fixed kilometre-based replacement interval for these sensors, but they’re worth checking whenever coolant is serviced (typically every 5 years/100,000 km with Honda Type 2 coolant) or if drivability’s gone off. Clues a sensor is on the way out include: hard cold starts, rough idle, poor fuel use, the radiator fan running constantly or not at all, a dead temp gauge, or a Check Engine Light with related codes (e.g., P0115–P0119, P0125, P0112/P0113).

• When replacing the ECT sensor: let the engine cool fully, relieve system pressure, catch and reuse/replace coolant as appropriate, and fit a new sealing washer/O‑ring. Torque to the spec in the Honda manual and avoid thread sealants that can affect grounding.
• Use scan data to compare reported temperatures against reality, a quick resistance vs. temperature test can confirm a sensor’s health.
• Inspect connectors and grounds for corrosion or damage before condemning the sensor. Many “sensor faults” are actually wiring issues.
• CVT fluid temperature sensors are typically internal, diagnosis is via scan data and wiring checks, with repair procedures per Honda’s CVT section.

Look after the cooling system with quality coolant, proper bleeding and a healthy thermostat, and most temperature sensors will quietly get on with the job for years.

Popular questions

Where is the engine coolant temperature sensor on a 2006 Honda Fit/Jazz?
It’s typically threaded into the cylinder head near the thermostat housing on the L15A engine. Access is from the top of the engine bay, removing the intake ducting often helps. Always disconnect the battery and let the engine cool before removal.

Can a bad temperature sensor cause the radiator fan to run all the time or not at all?
Yes. The ECU uses the ECT sensor to command the fan relays. If the sensor is reading unrealistically hot or cold, the fans may behave erratically. Before replacing parts, verify the sensor reading with a scan tool and check wiring and relays.

Do AU/NZ CVT models have a transmission fluid temperature sensor?
They do. The transmission control logic monitors CVT fluid temperature to manage ratio changes and line pressure. It’s generally not a separately serviceable external sensor, faults are diagnosed via scan data and addressed per Honda’s CVT service procedures.