Parts for your 2011 Toyota Vitz|yaris-Transmission filter

2011 Toyota Vitz/Yaris transmission filter — what’s actually fitted?

For the 2011 Toyota Vitz/Yaris, a separate, routinely serviceable “transmission filter” isn’t really a thing. On models with the 4‑speed auto (Aisin U340E/U341E) there’s an internal pan strainer, on Super CVT‑i models (K310/K311 family) there’s an internal fine filter/screen and, in some variants, a small cartridge element inside the casing. Toyota does not specify periodic replacement of these filters in scheduled maintenance. Replacement is generally only called up when the transmission is disassembled for repair or overhaul, which is why a standalone, external service filter isn’t relevant to normal servicing for this car.

Why it’s set up this way comes down to Toyota’s “sealed” design philosophy for this generation. With ATF WS (for the conventional auto) and Toyota CVT FE/TC fluids (for the CVT), the unit relies on an internal strainer or fine screen to protect the pump and valve body from large debris while maintaining stable fluid pressure. By keeping the filter media inside the unit and out of the cooler lines, flow restriction stays low, shift quality is consistent, and there are fewer leak points. The manual gearbox, where fitted, doesn’t use a filter at all—just magnets and the correct GL‑rated oil.

What makes sense for owners is condition‑based care rather than chasing a non‑existent external filter kit:

• Have the fluid inspected periodically (colour/odour/contamination) and changed if it’s discoloured, burnt, or after hard service (towing, heat, stop‑start). Use Toyota ATF WS for the 4‑speed auto or the specified Toyota CVT fluid for the CVT.
• When servicing the auto, a pan drop to clean the magnets and replace the gasket is smart practice. Replace the internal strainer only if contamination is found or during overhaul.
• For CVT models, set fluid level at the specified temperature and follow the service procedure, filter replacement is not part of routine maintenance.

Technical sources: Toyota Repair Manual (Yaris/Vitz 2011) – Automatic Transaxle U340E/U341E “Oil Strainer” is listed under Overhaul, not routine service, Toyota Repair Manual – CVT K310/K311 “Oil Filter” is internal and serviced during unit disassembly, 2011 Owner’s Manual notes ATF WS/CVT fluid with no scheduled filter replacement, Toyota Electronic Parts Catalogue lists “Strainer Assy, Oil (AT)” and “Filter Assy, Oil (CVT)” as internal components.

Does a 2011 Vitz/Yaris have a serviceable transmission filter?

No external, routine‑service filter. The auto uses an internal pan strainer and the CVT uses internal filtration. Toyota only calls for filter/strainer replacement during repair or overhaul, not regular servicing.

When should the transmission strainer or internal filter be replaced?

Only if the transmission is being rebuilt, or if inspection reveals debris/contamination that warrants opening the unit. For everyday servicing, focus on fluid condition, pan cleaning, and correct level/temperature procedures.

Which fluid should be used?

Use Toyota ATF WS for the 4‑speed auto and the correct Toyota Super CVT‑i fluid (as specified on the under‑bonnet label or service data) for CVT models. Mixing fluids or using the wrong spec can cause shift quality issues and premature wear.