Honda 2004 Odyssey Service Manual page 895

Automatic Transmission
System Description (cont'd)
Electronic Control System (cont'd)
Lock-up Control
The torque converter clutch solenoid valve controls the hydraulic pressure to switch the lock-up shift valve and lock-up
ON and OFF. The PCM actuates the torque converter clutch solenoid valve and the A/T clutch pressure control
solenoid valve C to control the torque converter clutch lock-up on. When the torque converter clutch solenoid valve is
ON, the condition of the lock-up starts. The A/T clutch pressure control solenoid valve C regulates and applies the
hydraulic pressure to the lock-up control valve to control the amount of the lock-up.
The lock-up mechanism operates in 3rd, 4th, and 5th gears in the D position, and 3rd gear in the D3 position.
Engine Coolant
Temperature
Sensor Signal
Barometric Pressure
Sensor Signal
Transmission Range
Switch Signal
Throttle Position
Sensor Signal
Output Shaft (Countershaft)
Speed Sensor Signal
Input Shaft (Mainshaft)
Speed Sensor Signal
Engine RPM Signal
ATF Temperature
Sensor Signal
14-282
PCM
Engine Coolant
Temperature
control
Shifting position
control
Gradient control
by magnitude
Fail-safe control
Actual
Driving
Shift
Position
Lock-up Control
Driving shift
• Lock-up ON/OFF control
position
• Lock-up condition
information
control
Correction of
Lock-up condition
ATF temperature
learning Control
sensor data
Torque Converter
Clutch Solenoid Valve
Master Target
of Controlling
Current
A/T Clutch Pressure
Current
Control Solenoid
feedback
Valve C