No. 1, No. 2 Solenoid Valve Circuit
CIRCUIT DESCRIPTIONShifting from 1st to O/D is done in combination with ON and OFF of the No. 1 and No. 2 solenoid valves controlled by Engine Control Module (ECM). If an open or short circuit occurs in either of the solenoid valves, the ECM controls the remaining normal solenoid to allow the vehicle to be operated smoothly (Fail safe function).
X: Malfunctions
Fail Safe Function
If either of the solenoid valve circuits develops a short or an open, the ECM turns the other solenoid ON and OFF to shift the gear positions shown in the table. If both solenoids malfunction, the hydraulic control is not made electronically and can only be operated manually.
Manual shifting as shown in the following table must be done. (In the case of a short circuit, the ECM stops sending current to the short circuited solenoid).