Parts for your 2002 Toyota Hilux surf-Transmission filter

2002 Toyota Hilux Surf transmission-filter: what it is and when to service it

Based on Toyota’s factory service literature for the A340F/A343F automatic transmissions used in the 2002 Hilux Surf, and Aisin’s A340 series overhaul manuals, this model is fitted with an internal transmission oil strainer (commonly called a transmission-filter). Toyota’s Electronic Parts Catalogue also lists a “Strainer assembly, oil” for these gearboxes. So yes — the 2002 Hilux Surf uses a transmission-filter, and it sits inside the transmission sump (pan).

On this Hilux Surf, the transmission-filter is a robust, mesh-style strainer that protects the hydraulic circuits and solenoids from clutch material and other fine debris as the ATF ages. It doesn’t usually clog like a paper engine oil filter, but it does slowly load up. Paired with the pan magnets, it’s the first line of defence for smooth shifts and long transmission life.

For routine servicing, the smart approach is a pan-off service every 60,000–100,000 km, especially if the vehicle tows, sees beach work, or works hard in hot climates. During that service, the pan is dropped and cleaned, the magnets are wiped, and the transmission-filter is inspected and replaced if it shows contamination or damage. Many techs replace it proactively because the part is inexpensive compared with transmission wear. Always refit with a new pan gasket and torque the pan bolts evenly to avoid leaks.

Fluid choice matters. The A340F/A343F in a 2002 Hilux Surf specifies Toyota ATF Type T-IV (JWS 3309). A simple drain-and-fill will return around 2–4 litres, a staged series of drain-and-fills, or a machine exchange done gently after a pan service, refreshes more of the total ±8–9 litres. Avoid aggressive “power flushing” on high-kilometre units that haven’t been serviced — it can dislodge sludge too quickly.

Practical signs the transmission-filter needs attention include: delayed engagement into Drive or Reverse when cold, flaring or harsh shifts, or ATF that’s dark with a burnt smell. None of these automatically mean a rebuild — often a proper service with a new strainer and fresh T‑IV can tidy up shift quality.

Bottom line: this Hilux Surf absolutely has a transmission-filter, and treating it as a service item — rather than a lifetime part — is cheap insurance for Aisin’s tough A340-series auto.

• Recommended interval: inspect every 60,000–100,000 km, replace whenever the pan is off or debris is present.
• Use ATF: Toyota Type T‑IV (JWS 3309) or equivalent that clearly states T‑IV compatibility.
• Best practice: clean pan and magnets, replace transmission-filter and gasket, then refill and check level hot, on level ground, with the shifter cycled through all ranges.

Popular questions

What ATF does a 2002 Toyota Hilux Surf use?

The A340F/A343F auto in this model is designed for Toyota ATF Type T‑IV (JWS 3309). Choosing a fluid that explicitly meets T‑IV is key to keeping shift feel and clutch durability where they should be. Later Toyota “WS” spec isn’t correct for this year’s gearbox.

How often should the transmission-filter be replaced?

As a rule of thumb, have the pan dropped and the transmission-filter inspected every 60,000–100,000 km. Replace it if there’s visible debris or varnish, or anytime the pan is off for service. Vehicles that tow, see off‑road sand work, or spend time in traffic heat benefit from the earlier end of that range.

Is a full transmission flush safe on a high‑kilometre Hilux Surf?

It can be, but only after a pan service with a new transmission-filter and clean magnets. Avoid harsh, high‑pressure flushes on neglected units — staged drain‑and‑fills or a gentle exchange through the cooler lines is kinder and reduces the risk of stirred‑up debris causing shift issues.