AT2–85 A340E (2JZ—GTE) AUTOMATIC TRANSMISSION – TROUBLESHOOTING DTC 64 No. 3 Solenoid Valve Circuit (For Lock–up Control Pressure Modulation) CIRCUIT DESCRIPTION The No.3 solenoid valve is provided for lock–up operations. The lock–up operation pressure is controlled by the linear solenoid for smooth engagement. The amount of current flow to the solenoid is controlled by the duty ratio (See page AT2–75) of ECM output signal. The higher the duty ratio becomes, the higher the lock–up hydraulic pressure becomes during the lock–up operation. If the malfunction occurs in this circuit and diagnostic trouble code 64 is stored in memory, but the O/D OFF indicator light does not blink. Lock-up Operation Pressure Current flow to solenoid DTC No. Diagnostic Code Detection Condition Trouble Area 64 All conditions below are detected for 1 sec. or more. (2 trips detection logic)* (a) ECM outputs duty signal to No.3 solenoid in 90% or higher duty ratio. (b) Current to No.3 solenoid: 450 ± 100 mA or less. No.3 solenoid valve Harness or connector between No.3 solenoid valve and ECM ECM *: See page AT2–58 <Reference> Waveform between terminals SLN– and E1 when engine is idling. 5 V/div. GND 1 msec./division AT8784 Waveform between terminals SLN– and E1 during shift change. 5 V/div. GND 1 msec./division AT8786