Honda Accord 2008 Manual page 883

07/11/02 08:46:28 61TA0000_140_0040
Automatic Transmission
System Description (cont'd)
Electronic Control System (cont'd)
Shift Control
The PCM instantly determines which gear should be selected by various signals sent from sensors and switches, and
it actuates shift solenoid valves A, B, C, D, and E to control gear selection.
A grade logic control system has been adopted to control shifting in D and D3. The PCM compares actual driving
conditions with programmed driving conditions, based on the input from the accelerator pedal position sensor, the
engine coolant temperature sensor, the barometric pressure sensor, the brake pedal position switch signal, and the
shift lever position signal, to control shifting while the vehicle is ascending or descending a slope.
＊０２
Output Shaft (Countershaft)
Speed Sensor Signal
14-38
Engine RPM Signal
Transmission
Range
Switch Signal
Accelerator Pedal
Position Sensor Signal
Input Shaft (Mainshaft)
Speed Sensor Signal
ATF Temperature
Sensor Signal
Brake Pedal Position
Switch Signal
Engine Coolant
Temperature
Sensor Signal
PCM
Engine RPM Control
Shift Position
F-CAN
Control
Fail-safe Control
Actual Driving
Shift Position
Read of ATF
Temperature
Master Target of
Shifting Position
Correction to
Shifting Mode
Grade Logic Control
• Ascending Mode
• Descending Mode
Calculation of
Gradient
Correction for Engine
Coolant Temperature
Sensor Signal Data
Barometric
Pressure
Sensor Signal
Gauge Control Module
A/T Gear Position
Indicator
Shift Solenoid
Valve A
Shift Solenoid
Valve B
Shift Solenoid
Valve C
Shift Solenoid
Valve D
Shift Solenoid
Valve E