Parts for your 2006 Honda Elysion-Temperature sensors

2006 Honda Elysion temperature sensors — what they do and how to look after them

According to Honda’s Elysion Service Manual (RR1–RR4, 2004–2009), the Honda PGM-FI system description, the 5‑speed automatic transmission service literature, and the factory parts catalogue for the 2006 model, this vehicle is fitted with multiple temperature sensors: engine coolant temperature (ECT), intake air temperature (IAT), automatic transmission fluid temperature, ambient air temperature for climate control, and an evaporator temperature sensor. So temperature sensors aren’t just relevant on a 2006 Honda Elysion — they’re central to how it runs and keeps passengers comfortable.

On the engine side, the ECT sensor feeds the ECU with real-time coolant temperature so it can adjust fuelling, ignition timing and idle speed, and trigger the radiator fans. A lazy or failed ECT can cause hard cold starts, rich running, poor fuel economy, or the fans cycling oddly. The IAT sensor helps trim fuelling based on the air charge temperature, improving driveability across hot and cold Kiwi and Aussie conditions.

The 5AT uses an internal temperature sensor to protect the transmission, adjusting shift strategy when the fluid’s cold or hot. For the cabin, the ambient sensor behind the front bumper and the evaporator thermistor inside the HVAC box let the climate control hit target temps without iced-up vents or sweaty commutes.

None of these sensors are a scheduled “replace at X km” item. Instead, they’re checked when symptoms or fault codes pop up. Good servicing practice on a 2006 Elysion includes:

• Scanning live data (ECT, IAT, ATF temp, ambient) and checking for DTCs if there’s rough running, poor economy or A/C oddities.
• Inspecting connectors for corrosion, oil soak or broken tabs, cleaning with proper electrical contact cleaner.
• For ECT replacement: work on a cold engine, safely relieve coolant pressure, swap the sensor on the thermostat housing or head (engine-dependent), use a new sealing washer, and tighten to the Honda spec in the service manual. Top up with the correct Honda Type 2 coolant and bleed air.
• Avoiding “universal” sensors where the calibration curve may be off, genuine or high-quality OEM-equivalent parts are worth it.
• Ambient sensor issues after minor front-end knocks are common, if the climate reads –40°C or +50°C, check that sensor first.

If the transmission temp readings look suspect, confirm with the service data — replacement typically involves work on the internal harness and isn’t a driveway job. A competent workshop can test before tearing anything apart.

Popular questions

Where is the coolant temperature sensor on a 2006 Honda Elysion?
It’s typically mounted near the thermostat housing or on the cylinder head by the upper radiator hose outlet. Access varies with the engine (K24A 2.4L or J30A 3.0L), but it’s a small two‑pin sensor. Disconnect the plug, undo the sensor, and be ready for a little coolant loss if replacing.

What are the symptoms of a bad temperature sensor on an Elysion?
Common giveaways include hard cold starts, high idle, rich smell, poor fuel economy, fans running constantly or not at all, erratic temperature gauge, harsh transmission shifts when hot, or climate control that can’t hold set temperature. Scan data that doesn’t track reality (e.g., –40°C or +130°C) is a big clue.

Should temperature sensors be replaced preventatively?
Generally, no. They’re replaced on condition. Use a scan tool to confirm bad readings, check wiring and grounds, and only then fit a quality replacement. For the ECT, pair the job with fresh coolant if it’s due, and always follow the torque and sealing guidance in the Honda manual.