Honda 2004 Odyssey Service Manual page 889

Automatic Transmission
System Description (cont'd)
Electronic Control System
Functional Diagram
The electronic control system consists of the powertrain control module (PCM), sensors, and solenoid valves.
Shifting and lock-up are electronically controlled for comfortable driving under all conditions.
The PCM recieves input signals from the sensors, switches, and other control units, perform processing data, and
outputs signals for the engine control system and A/T control system. The A/T control system includes shift control,
grade logic control, clutch pressure control, and lock-up control is stored in the PCM.
The PCM switches the shift solenoid valves and the A/T clutch pressure control solenoid valves to control shifting
transmission gears and lock-up torque converter clutch.
Engine RPM Signal
Throttle Position
Sensor Signal
Engine Coolant
Temperature Sensor Signal
Barometric Pressure
Sensor Signal
Manifold Absolute
Pressure Sensor Signal
ATF Temperature
Sensor Signal
Service Check Signal
Transmission
Range
Switch
Signal
Input Shaft (Mainshaft)
Speed Sensor Signal
Output Shaft (Countershaft)
Speed Sensor Signal
3rd Clutch Transmission
Fluid Pressure Switch Signal
4th Clutch Transmission
Fluid Pressure Switch Signal
Brake Pedal Position
Switch Signal
Cruise Control Unit
Downshift Request Signal
14-276
PCM
PGM-FI Control
System
A/T Control System
Shift Control
Grade Logic Control
• Ascending control
Descending control
•
• Deceleration
control
Clutch Pressure
Control
Lock-up Control
Self-diagnosis/
Fail-safe Function
Communication and
Output Function
Shift Lock Control
Gauge Assembly
A/T Gear Position Indicator
D Indicator
Shift Solenoid Valve A
Shift Solenoid Valve B
Shift Solenoid Valve C
A/T Clutch Pressure
Control Solenoid Valve A
A/T Clutch Pressure
Control Solenoid Valve B
A/T Clutch Pressure
Control Solenoid Valve C
Torque Converter
Clutch Solenoid Valve
Vehicle Speed Signal
Data Link Connector
Multiplex
Control Unit
Automatic
5-speed and
Reverse
Lock-up
ON/OFF
Lock-up
Conditions
Shift Lock
Solenoid