DTC 64 Lock–up Solenoid valve Circuit CIRCUIT DESCRIPTION The SL solenoid valve is turned ON and OFF by signals from the ECM to control the hydraulic pressure acting on the lock–up relay valve, which then controls operation of the lock–up clutch. If a malfunction occurs in this circuit and diagnostic trouble code 64 is stored in memory, the O/D OFF indicator light does not blink. Fail Safe Function If the ECM detects a malfunction, it turns the lock–up solenoid valve OFF. DTC No. | Diagnostic Trouble Code Detection Condition | Trouble Area 64 (a) Solenoid resistance is 8 Ω or lower (short circuit) when solenoid energized. (b) Solenoid resistance is 100 kΩ or higher (open circuit) when solenoid is not energized. ECM memorizes diag. trouble code 64 if about (a) or (b) condition is detected once or more, but ECM does not start O/D OFF indicator light blinking. · Lock–up solenoid valve · Harness or connector between lock–up solenoid valve and ECM · ECM WIRING DIAGRAM Transmission Lock–up Solenoid Valve Y 3 B-R 8 E9 S3 ECM B+ Q04350