Toyota’s U660E mounted to a V6 engine and the U760/1E with the L4 is a front wheel drive transmission (figure 1). It utilizes 7 solenoids to achieve 6 forward gears along with flex lock up control (figure 2). The SL1, SL2, SL3 and SL4 are clutch control linear solenoids. SL1 controls the C1 clutch, the SL2 controls the C2 clutch, the SL3 controls the B1 Brake and the SL4 controls the B3 Brake. The SLU and the SL solenoids controls flex lock up of the converter clutch while the SLT controls main line pressure.
Care must be taken when servicing the valve body as the solenoids can be easily inserted incorrectly. Here is a case where the solenoids are similar but are not the same, especially with the SLU and the SLT solenoid. They are both identical in size, they both have black color connector and the connectors are configures exactly the same. The SLU solenoid is a Normally Vented solenoid while the SLT is a Normally Applied solenoid. The only way to distinguish the difference between the two is to have them removed from the valve body (figure 3). Once removed, the difference in the number of ports in the snout of the solenoid can be observed. The SLT has 5 while the SLU has 4.If the SLU and the SLT solenoids are accidently installed, an immediate no reverse
