A343F Solenoid Kit 2000-2004, remanufactured and ready to install. Fits the A343F. Ships fast from the USA.
A 2000-2004 4Runner or Tacoma 4x4, or a 100-series Land Cruiser, that launches in second, hangs in third, will not come out of fail-safe or never pulls the tach down into lockup on the highway is the classic case for this kit. It is a complete late-style service set for the Aisin four-speed in those trucks: two shift solenoids, the lockup solenoid, a steel-body pan filter and a cork pan gasket, so the valve body electrics and the filter are renewed in a single pan drop.
Toyota built several versions of the same four-speed. The A343F is the full-time 4x4 unit behind the 100-series Land Cruiser and the Lexus LX 470, while 4Runner, Tacoma and Tundra 4x4 trucks used the closely related A340F and two-wheel-drive trucks the A340E. All of them shift the same way. The engine computer has no linkage to the shift valves; it energizes solenoid S1 and solenoid S2 in four on/off combinations, one per gear, and the hydraulic shift valves follow. The third solenoid, SL, opens the path that applies the torque converter clutch in the upper gears at steady throttle.
That two-solenoid code is why failures look strange. If S2 sticks or loses its coil, the computer can command first and get a second-gear start, or command reverse and get nothing, because the valve pattern no longer matches any normal gear. A clogged inlet screen on one of the solenoids does the same thing slowly as the fluid ages.
Do not condemn the solenoids on a code alone. A documented 2002 Tacoma kept setting P0755 after new solenoids, a used valve body and a new computer; the cause was a loose ground bolt that left roughly 2 volts on the S2 circuit. Check grounds and the harness first, then measure each solenoid at the case connector and back-probe S1 and S2 while driving through the gears. Our multimeter solenoid test guide covers the readings, and the Aisin harsh or delayed shift walkthrough covers hydraulic causes if the electrical side checks good. Burnt fluid loaded with friction material means the clutches are already hurt, and a solenoid kit will not cure that.
This kit is supplied for 2000-2004 4Runner 4WD, 2002-2004 4Runner 2WD, 2000-2004 Tacoma 4WD, 2001-2004 Tundra with the V8, and 2000-2002 Land Cruiser. These are all the 2000-and-later valve body designs, which differ from the 1985-1999 trucks, so an older truck needs a different kit. Because Toyota used both V6 and V8 versions and both 2WD and 4WD cases in this window, compare one of your old solenoids with the photo for body shape, bracket angle and connector before installing, or send us your year and VIN and we will confirm it. Other A340-family parts are in our Aisin transmission parts collection, and a separately listed 2001-2004 A343F solenoid kit adds the Sequoia to its fitment list.
If shifts are still firm or late after the solenoids, a complete A340E valve body with solenoids or the A343F shift kit for 2000-2004 are the next steps.
| Fits | A343F 2000-2004 |
| Part type | Solenoid Kit |
| Condition | Remanufactured |
| Brand | OEM |
| Reference | A340E |
| Ships | From the USA |
| Warranty | 1-year |
For 2000-2004 4Runner and Tacoma 4x4 trucks, yes, they are on the supplied fitment list. Toyota used the A340F there and the A343F in the Land Cruiser 100-series and LX 470, but the late valve bodies use the same style of S1, S2 and SL solenoids. Compare an old solenoid with the photo or send us your VIN to be sure.
Two shift solenoids, one torque converter lockup solenoid, a steel-body pan filter and a cork pan gasket, as shown in the photo.
It is not required, but the three solenoids have the same age and see the same fluid. Since the pan is already off and the kit includes all three, most owners replace them together to avoid a second pan drop.
Toyota Type T-IV ATF for these model years, unless your dipstick or owner's manual calls for something else. Check the level with the engine running and the fluid at operating temperature.
There is no special programming step. Clear the codes, then drive through all four gears and up to lockup speed so you can confirm every shift and the converter apply.
