A340E Solenoid Kit, new and ready to install. Fits the A340E. Ships fast from the USA.
If your Toyota 4Runner or Pickup with the A340 four-speed automatic is hanging in one gear, starting out in second, refusing overdrive or never locking the converter on the highway, a tired solenoid is one of the first things to rule in or out. This is a brand-new three-piece set: two shift solenoids and one lock-up solenoid. It is built for Toyota trucks and rear-wheel-drive Lexus models from 1985 on that use the A340 family, including the 1986 to 1994 4Runner and Pickup, and it is the updated compact design that replaced the earlier, larger solenoids with tan connectors.
The A340E has no throttle-cable shift valve logic of its own; the engine computer decides each shift and carries it out by switching two on/off solenoids, S1 and S2, that sit on the valve body inside the pan. The combination of the two picks the gear. In a published Tacoma case study the pattern was S1 on in first and second and off in third and fourth, while S2 was on in second and third and off in first and fourth. The third solenoid, usually called SL, applies the torque converter clutch so the engine and transmission turn together at cruise. Because one combination of S1 and S2 equals one gear, a single weak or stuck solenoid shifts the whole map: the truck can launch in the wrong gear, skip one, or stay put.
Measure each solenoid's resistance at the case connector, then back-probe the wires on a road test and compare what the computer commands against the gear you feel. Our guide on testing a shift solenoid with a multimeter walks through both checks. Do not skip the wiring. In the Tacoma case above, a solenoid, a complete valve body and the computer were swapped before the shop found a loose ground putting a couple of volts on the S2 wire. A clean pan with no burnt friction material points toward the electrical side; a pan full of debris means the clutches and bands need attention too. If shifts are firm or late rather than missing, read Aisin harsh or delayed shifts first.
This set fits Toyota trucks and rear-drive Lexus applications with the A340 automatic that use three solenoids, from 1985 on, and specifically the 1986 to 1994 4Runner and Pickup. It is the newer, smaller solenoid style; if your old parts are the large tan-connector type, these are the intended replacement and bolt to the same valve body locations. It does not include the linear pressure solenoids some late trucks carry in addition to S1, S2 and SL, so compare your old parts before ordering. If you are unsure, send us the year and VIN, or browse every unit we stock on the Aisin transmission parts page.
| Fits | A340E |
| Part type | Solenoid Kit |
| Condition | New |
| Brand | OEM |
| Reference | A340 |
| Ships | From the USA |
| Warranty | 1-year |
Yes, the kit is listed for 1986 to 1994 4Runner and Pickup models with the A340 automatic. Compare your old solenoids before install; this is the updated compact style that replaces the earlier large tan-connector solenoids.
Three new solenoids: two shift solenoids (S1 and S2) and one lock-up solenoid that controls the torque converter clutch. No filter or gasket is included with this version.
Often it is S1 or S2, but check wiring first. A documented 2002 Tacoma with second-gear starts and no reverse turned out to be a loose ground feeding voltage onto the S2 wire after a solenoid, valve body and computer had already been replaced.
Use the ATF your owner's manual specifies for that model year. Earlier A340 trucks call for Dexron-type fluid and many later Toyotas call for Type T-IV. Check the level hot after a short drive.
No. The solenoids bolt to the valve body inside the pan, so the job is done from underneath with the transmission in the truck.
