Circuit Description and Detection Conditions

DTC 63 Shift Solenoid Valve No.2 Circuit

CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF of the No.1 and No.2 solenoid valves controlled by the 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 safety (see Fail Safe Function).

WIRING DIAGRAM





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 table below. The ECM also turns the SL solenoid valve OFF at this time. If both solenoids malfunction, hydraulic control cannot be performed electrically 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).

Fail-Safe Mode Shift Functions:

DTC 62, 63 DETECTION CONDITIONS
Condition A
Solenoid resistance is 8 ohms or lower (short circuit when solenoid is energized.
Condition B
Solenoid resistance is 100 k Ohms or higher (open circuit) when solenoid is not energized
The ECM checks for an open or short circuit in the No. 1 and No. 2 solenoid circuit when it changes gear position. The ECM records DTC 62 or 63 if condition A or B is detected once. hut it does not blink the "O/D OFF" indicator light. After the ECM detects the condition A or B continuously 8 times or more. it causes the "O/D OFF" indicator light to blink until condition A or B disappears. After that, if the ECM detects condition A or B once, it starts blinking the "O/D OFF" indicator light again.

TROUBLE AREA
- Solenoid valve
- Harness or connector between solenoid and ECM
- ECM

NOTE:
- Check the No.1 solenoid when diagnostic trouble code 62 is output.
- Check the No.2 solenoid when diagnostic trouble code 63 is output.