DTC 63
CIRCUIT DESCRIPTIONShifting from 1st to O/D is performed in combination with ON and OFF of the No. 1 and No. 2 solenoid valves controlled by 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).
FAIL-SAFE CHART
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 to the gear positions shown in the image above. The ECM also turns the lock-up solenoid valve OFF at the same time. If both solenoids malfunction, hydraulic control cannot be performed electronically and must be done 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).
Check the No. 1 solenoid when diagnostic trouble code 62 is output and check the No. 2 solenoid when diagnostic trouble code 63 is output.
DETECTING CONDITION AND TROUBLE AREA
(*) If the above failures are detected less than 8 times, the ECM memorizes the malfunction code but the O/D OFF indicator light doesn't blink.
DIAGNOSTIC CHART
WIRING DIAGRAM
INSPECTION PROCEDURE