Toyota A750E/F with Multiple Solenoid Circuit Faults

Toyota Tundra, 4Runner, Tacoma, Sequoia and FJ Cruiser equipped with the A750 transmission may exhibit a complaint of multiple transmission solenoid electrical circuit faults set. Typically, to have multiple solenoid electrical faults indicates that there is a power loss or ground problems, possible compromised wiring harness (pinched, broken or melted0, or a connector is not plugged in all the way or completely disconnected.  In this case, the cause may be, a bad weather pack seal on the harness side connector of the transmission case connector allowing moisture to corrode the male terminals and or deteriorating them. It is not uncommon to remove the external harness connector (female) and see the male terminals from the case connector, as shown in Figure 1, still stuck in the harness connector when this happens.