A343F Solenoid Kit, new and ready to install. Fits the A343F. Ships fast from the USA.
This is the bare three-solenoid set for the late Toyota four-speed: two shift solenoids and the torque converter lockup solenoid, new, with no filter or gasket in the box. It suits the owner who already has a pan gasket and filter on the shelf, or who has narrowed a 2000-2004 4Runner, Tacoma, Tundra, Sequoia, Land Cruiser or Lexus LX 470 problem down to the valve body electrics: a truck that starts off in second, sits in third with the O/D OFF lamp blinking, will not drop a gear to pass, or turns too many rpm on the highway because the converter clutch never applies.
The A343F is the full-time four-wheel-drive member of Aisin's A340 family, and the trucks on this fitment list run the A340E, A340F, A341F or A343F version of the same gearbox. None of them use a throttle cable to choose gears. The engine computer reads vehicle speed and throttle angle, then switches shift solenoids S1 and S2 on or off in one of four combinations; each combination moves the shift valves to give first, second, third or fourth. The third solenoid, SL, routes pressure to the converter clutch once the truck is in a high gear at a light, steady throttle. Each solenoid is a small coil and plunger that opens or closes a drain port, so it lives or dies by the cleanliness of the fluid around it. Varnish or fine clutch debris will hold a plunger partway open, and the computer then gets a gear it never asked for.
Pull codes first, then rule out the cheap causes. Check the fluid level hot and smell the fluid; burnt, black fluid means the clutches may be the real problem and new solenoids will not cure slipping. Next look at the wiring. A widely shared Tacoma case set P0755 even after the solenoid, valve body and computer were replaced, and the cause turned out to be a loose ground bolt. Clean the grounds, check the connector at the case, then meter each solenoid with the pan off. Our walkthrough on testing a shift solenoid with a multimeter shows how to read the coil and spot an open or shorted winding. If the codes are clean but shifts are still firm or slow, work through our Aisin harsh and delayed shift diagnosis before committing to parts.
The set is supplied for the 2000-2004 4Runner (2WD and 4WD), 2000-2004 Tacoma (2WD and 4WD), 2001-2004 Tundra (2WD and 4WD), 2001-2004 Sequoia 4WD, and the 2000-2002 Land Cruiser and Lexus LX 470. Toyota redesigned this valve body for the 2000 model year, so the 1985-1999 trucks are not covered here. Even within 2000-2004 Toyota used more than one valve body casting depending on engine and throttle type, so compare your old solenoids, their mounting brackets and connector shape against the photo before you open the pan, or send us your year and VIN and we will check it for you. If you would rather replace the filter and gasket in the same job, the A343F solenoid kit with filter and gasket covers the same years, and every other A340-family part we carry is in the Aisin transmission parts collection.
A new solenoid cannot fix a worn bore in the valve body. If shifts are still harsh afterward, the TransGo 340-HD2 reprogramming kit corrects the hydraulic side, and a truck that slips under load is a candidate for the A340E overhaul kit instead.
| Fits | A343F |
| Part type | Solenoid Kit |
| Condition | New |
| Brand | OEM |
| Reference | A340E |
| Ships | From the USA |
| Warranty | 1-year |
Three new solenoids: the two shift solenoids (S1 and S2) and the torque converter lockup solenoid (SL). There is no filter or pan gasket in this set, so buy those separately or choose the 2000-2004 kit that includes them.
No. Toyota changed the A340 valve body for the 2000 model year, and this set is supplied for 2000-2004 trucks and the 2000-2002 Land Cruiser and LX 470. Earlier trucks need the earlier-style solenoids.
Not strictly, but the solenoids share the same fluid and the same age. If one plunger is sticking from varnish, the others have seen the same conditions, and replacing the set means the pan only comes off once.
These trucks do not need a scan-tool relearn for the solenoids. Clear the stored codes, top off the fluid hot, and drive through every gear and into lockup so you can confirm the fault is gone.
The 2000-2004 trucks on this list call for Toyota Type T-IV ATF. Check your owner's manual or dipstick marking, and set the level with the fluid at operating temperature.
