Honda Accord 2008 Manual page 882

07/11/02 08:46:28 61TA0000_140_0039
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 receives input signals from sensors, switches, and other control units, processes data, and outputs signals
for the engine control system and the A/T control system. The A/T control system includes shift control, grade logic
control, clutch pressure control, and lock-up control.
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.
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Engine RPM Signal
Accelerator Pedal Position
Sensor Signal
Throttle Position
Sensor Signal
Engine Coolant
Temperature Sensor Signal
Barometric Pressure
Sensor Signal
Manifold Absolute
Pressure Sensor Signal
A/T Control System
ATF Temperature
Sensor Signal
Service Check Signal
Grade Logic Control
• Ascending Control
•
Transmission
Range
Switch
Signal
Input Shaft (Mainshaft)
Speed Sensor Signal
Output Shaft (Countershaft)
Speed Sensor Signal
2nd Clutch Transmission Fluid
Pressure Switch Signal
Self-diagnosis/
Fail-safe Function
3rd Clutch Transmission Fluid
Pressure Switch Signal
Communication and
Output Function
Brake Pedal Position
Switch Signal
Shift Lock Control
Cruise Control Downshift
Request Signal
PCM
F-CAN
PGM-FI Control
System
Shift Solenoid Valve A
Shift Solenoid Valve B
Shift Control
Shift Solenoid Valve C
Descending Control Shift Solenoid Valve D
Shift Solenoid Valve E
A/T Clutch Pressure
Control Solenoid Valve A
Clutch Pressure
A/T Clutch Pressure
Control
Control Solenoid Valve B
A/T Clutch Pressure
Control Solenoid Valve C
Lock-up Control
Vehicle Speed Signal
Data Link Connector
Shift Lock Solenoid
Gauge Control Module
A/T Gear Position Indicator
Automatic
Five-speed
and Reverse
Lock-up
ON/OFF
Lock-up
Conditions
(cont'd)
14-37