A340E and A343F shift and lock-up solenoids bundled with the transmission filter and pan gasket, for 2000-2004 Toyota 4Runner and Lexus, 2WD and 4WD.
A 2000-2004 4Runner or matching Lexus with an A340E or A343F that starts in second, will not pick up overdrive, shudders at light throttle around 45 mph or never locks the converter usually has a problem under the pan, and this kit puts every service part for that pan drop in one box: the two shift solenoids, the lock-up (TCC) solenoid, a new pan filter and a cork pan gasket. It is the right buy when the truck has never had the pan off and you are going in for solenoids anyway.
The A340E is Aisin's four-speed rear-drive automatic, and the A343F is the version built for four-wheel-drive trucks. Neither one has a throttle-valve-only shift strategy like the old hydraulic units; the engine computer picks every gear by switching two on-off shift solenoids, S1 and S2, in combination. A documented 2002 Tacoma diagnosis shows how tightly the two are linked: a fault on the S2 circuit produced second-gear starts, no fourth and no reverse all at once, not one bad shift. The third solenoid in this kit controls the lock-up clutch inside the torque converter. When it sticks or loses its seat, the converter either never locks, so rpm stays high and fluid runs hot on the highway, or it applies roughly and you feel a shudder at steady cruise.
Codes point at a circuit, not a part. In that Tacoma case the shop replaced the S2 solenoid, a complete valve body and the computer before finding a loose engine-bay ground putting voltage on the S2 wire. So back-probe S1 and S2 in each gear, check resistance at the case connector, and confirm grounds before you order; our solenoid multimeter test guide covers the meter work. If the electrical side checks out and shifts are late or harsh, run through the Aisin harsh and delayed shift walkthrough next. Pull a fluid sample too. Burnt, dark fluid with friction material in the pan means worn clutches, and this kit will not cure slip under load.
The listing covers the A340E and A343F in 2000-2004 Toyota 4Runner and the matching Lexus applications, two-wheel and four-wheel drive. Solenoid interchange numbers are 85420-30110, 85420-301230, 35250-50030, 35250-30070 and 35250-30050, and the filter crosses to 35330-60030. Units from 2000 on use a redesigned valve body that Sonnax identifies as Type 3 (casting 8935) or Type 4 (casting 8938), so read the transmission code on the ID tag and compare your old solenoids and filter to the photos before you open the box. If you are not sure what is in your truck, send us the year and VIN. You can browse every Aisin family part on our Aisin transmission parts page.
If you only need the bare solenoids, the three-piece A340E solenoid set is the same electrical job without the filter. When the problem turns out to be sticking valves rather than solenoids, the A340E valve body is the next step, and a unit with burnt clutches needs the master rebuild kit with frictions and steels.
| Contents | |
| Solenoid interchange | |
| Filter interchange | |
| Transmission | |
| Fitment | |
| Item weight |
It fits 4Runners built with the A340E or A343F four-speed. Some later trucks in that range use a different transmission, so read the code on the transmission ID tag or send us your year and VIN before ordering.
Two shift solenoids and one torque converter lock-up solenoid, plus the pan filter and pan gasket. The interchange numbers are listed in the fitment section so you can match them to your old parts.
No. Solenoids fix electrical shift and lock-up faults such as no fourth, second-gear starts and converter shudder. If the fluid is burnt and the transmission slips under load, the clutches are worn and the unit needs a rebuild.
Use the Dexron-type or Toyota T-IV fluid your owner's manual calls for, then set the level hot with the engine idling in park on level ground.
Clear the stored codes, then road test through every gear and into lock-up at cruise. Check that the codes do not return and that fourth gear and lock-up both engage normally.
