Parts for your 2005 Honda Elysion-Transmission filter

2005 Honda Elysion transmission filter: what it does and how to look after it

Drawing on Honda’s Elysion (RR1–RR4) service manual Automatic Transmission section, the Honda Electronic Parts Catalogue for RR-series models, and Honda service literature for ATF-Z1/DW-1 systems, the 2005 Honda Elysion runs a 5‑speed automatic that uses an internal, non‑serviceable strainer and, on most trims, a serviceable in‑line ATF filter on the cooler return line (often listed as Filter Assy., ATF, P/N 25430‑PLR‑003). Honda treats the filter as a non‑scheduled item in routine servicing, but acknowledges replacement during transmission repair or when contamination is suspected.

For owners, that means a transmission filter is indeed part of the Elysion’s setup, even if it’s not something Honda expects to be swapped at every service. The internal strainer protects the valve body and clutch packs from larger debris, while the external in‑line filter catches finer wear particles and varnish that circulate with the fluid. Together they help the 5‑speed auto shift cleanly, reduce solenoid fouling, and extend clutch life.

Day to day, the smartest play is fresh fluid. These boxes originally specified Honda ATF‑Z1 and were later superseded to Honda ATF‑DW1. A conservative, Kiwi/Aussie‑friendly approach is a drain‑and‑fill every 40,000–60,000 km if the vehicle tows, sees hot summers, or mostly does stop‑start city runs. Clean fluid keeps the filter’s workload down and the shift quality up.

When should the external filter be replaced? It’s commonly done during major transmission work, after an overheating event, if the pan magnet shows heavy metal, or when the ATF comes out notably dark with a burnt smell. Many import specialists also choose to renew the in‑line filter proactively around 120,000–150,000 km on JDM Elysions, especially if history is unknown. Use the correct, flow‑direction‑marked filter, fresh clamps or O‑rings as required, and top up with Honda DW‑1. After any filter or cooler‑line work, check for leaks and recheck the fluid level at operating temperature.

Worth watching for:

• Harsh or flaring shifts after heat or long climbs
• Delayed engagement into Drive or Reverse
• ATF that’s brown/black or smells burnt

If any of those crop up, a fluid service plus an external filter replacement is cheap insurance before small issues become big bills.

Does a 2005 Honda Elysion have a replaceable transmission filter?
Yes. It uses an internal strainer (not routinely serviceable) and, on most RR‑series trims, a replaceable in‑line ATF filter on the cooler return hose. Honda doesn’t set a fixed interval for it, but it’s commonly replaced during major transmission service or if contamination is found.

When should the transmission filter be changed on an Elysion?
Change it if the fluid is badly discoloured, after overheating, during a rebuild, or as proactive maintenance around 120,000–150,000 km if service history is unclear. Pair the job with fresh Honda ATF‑DW1 and verify the level hot.

Which transmission fluid does it need, and how much?
Use Honda ATF‑DW1 (supersedes ATF‑Z1). A single drain‑and‑fill typically takes around 3–3.5 litres, a series of two to three drain‑and‑fills can exchange most of the fluid without a machine. Always measure what comes out and refill accordingly, then check level at temperature.