Honda Odyssey 2004. Manual — part 221
*03
Electronic Control System
Shift Control
14-278
Automatic Transmission
System Description (cont’d)
PCM
Engine RPM Signal
Throttle Position
Sensor Signal
Engine Coolant
Temperature
Sensor Signal
Barometric Pressure
Sensor Signal
Transmission Range
Switch Signal
Brake Pedal Position
Switch Signal
A/T Gear Position
Indicator D Indicator
Vehicle Speed Signal
Shift Lock Solenoid
ATF Temperature
Sensor Signal
Cruise Control
Downshift Request
Signal
Actual Driving
Shift Position
ATF
Temperature
Engine RPM Control
Shift Position
Control
Fail-safe Control
Comparison
with
Signals
Master Target of
Shifting Position
Correction of Data
Selection of Shifting
mode
Grade Logic Control
Calculation of
gradient
Correction of engine
coolant temperature
sensor signal data
Correction of cruise
control signal data
Judgment of
Controlling Area
Frequency Divider
Input Shaft (Mainshaft)
Speed Sensor Signal
Output Shaft (Countershaft)
Speed Sensor Signal
Shift Solenoid Valve A
Shift Solenoid Valve B
Shift Solenoid Valve C
The PCM instantly determines which gear should be selected by various signals sent from sensors and switches, and
it actuates the shift solenoid valves A, B, and C to control shifting.
Also, as grade logic control system has been adopted to control shifting in the D and D3 positions. The PCM compares
actual driving conditions with memorized driving conditions, based on the input from the throttle 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.
03/07/29 09:37:13 61S0X050_140_0281
14-279
The PCM turns on the shift solenoid valves A, B, and C to control shifting transmission gear.
The combination of driving signals to shift solenoid valves A, B, and C are shown in the table.
Position
Gear position
Shift solenoid valves
A
B
C
D, D3
Shifting from the N position
OFF
ON
OFF
Stays in 1st
ON
ON
ON
Shifting gears between 1st and 2nd
ON
ON
ON
Stays in 2nd
ON
ON
OFF
Shifting gears between 2nd and 3rd
OFF
ON
OFF
Stays in 3rd
OFF
ON
ON
D
Shifting gears between 3rd and 4th
OFF
OFF
ON
Stays in 4th
OFF
OFF
OFF
Shifting gears between 4th and 5th
ON
OFF
OFF
Stays in 5th
ON
OFF
ON
2
2nd
ON
ON
OFF
1
1st
ON
ON
ON
R
Shifting from the P and N position
OFF
ON
ON
Stays in reverse
OFF
ON
OFF
Reverse inhibit
ON
ON
ON
P
Park
OFF
ON
OFF
N
Neutral
OFF
ON
OFF
(cont’d)
03/07/29 09:37:13 61S0X050_140_0282
*07
*08
Electronic Control System (cont’d)
Grade Logic Control: Ascending Control
Grade Logic Control: Descending Control
Grade Logic Control: Deceleration Control
14-280
Automatic Transmission
System Description (cont’d)
2ND
3RD
3RD
4TH
4TH
5TH
100 %
50
0
62 mph
(100 km/h)
Vehicle speed
ASCENDING MODE: Upshift Schedule
: FLAT ROAD MODE
: GRADUAL ASCENDING MODE
: MEDIUM ASCENDING MODE
: STEEP ASCENDING MODE
2ND
1ST
T
h
rott
le
ope
ning
2ND
3RD 3RD
4TH
4TH
5TH
100 %
50
0
62 mph
(100 km/h)
Vehicle speed
DESCENDING MODE: Downshift Schedule
: FLAT ROAD MODE
: GRADUAL DESCENDING MODE
: MEDIUM DESCENDING MODE
: STEEP DESCENDING MODE
2ND
1ST
T
h
ro
tt
le
o
pe
ni
ng
When the PCM determines that the vehicle is climbing a hill in the D and D3 positions, the system extends the
engagement area of 2nd gear, 3rd gear, and 4th gear to prevent the transmission from frequently shifting between
2nd and 3rd gears, between 3rd and 4th gears, and between 4th and 5th gear, so the vehicle can run smooth and have
more power when needed.
NOTE: Shift schedules stored in the PCM between 2nd and 3rd gears, between 3rd and 4th gears, and between 4th and
5th gear, enable to automatically select the most suitable gear according to the magnitude of a gradient.
When the PCM determines that the vehicle is going down a hill in the D and D3 positions, the shift-up speed from 4th
to 5th gear, 3rd to 4th gear and from 2nd to 3rd (when the throttle is closed) becomes faster than the set speed for flat
road driving to widen the 4th gear, 3rd gear and 2nd gear driving areas. This, in combination with engine braking from
the deceleration lock-up, achieves smooth driving when the vehicle is descending. There are three descending modes
with different 4th gear driving areas, 3rd gear driving areas and 2nd gear driving areas according to the magnitude of
a gradient stored in the PCM. When the vehicle is in 5th gear or 4th gear, and you are decelerating while applying the
brakes on a steep hill, the transmission will downshift to lower gear. When you accelerate, the transmission will then
return to higher gear.
When the vehicle goes around a corner, and needs to decelerate first and then accelerate, the PCM sets the data for
deceleration control to reduce the number of times the transmission shifts. When the vehicle is decelerating from
speeds above 37 mph (60 km/h), the PCM shifts the transmission from 5th or 4th to 2nd earlier than normal to cope
with upcoming acceleration.
03/07/29 09:37:14 61S0X050_140_0283
*04
Clutch Pressure Control
14-281
PCM
Engine RPM Signal
Throttle Position
Sensor Signal
Barometric Pressure
Sensor Signal
ATF Temperature
Sensor Signal
Actual
Driving
Shift
Position
Correction of Data
Correction of engine
coolant temperature
sensor signal data
Manifold Absolute
Pressure Sensor Signal
Correction of ATF
temperature sensor
data
Correction of
hydraulic pressure
application timing
Correction of engine
torque signal data
Master Target of
Controlling Current
Decision of
shifting mode
Requirement to
retard ignition
timing
PGM-FI Control
System
Current
feedback
A/T Clutch Pressure
Control Solenoid
Valves A, B, and C
Engine Coolant
Temperature
Sensor Signal
Input Shaft (Mainshaft)
Speed Sensor Signal
3rd Clutch Transmission
Fluid Pressure Switch
Signal
Output Shaft (Countershaft)
Speed Sensor Signal
4th Clutch Transmission
Fluid Pressure Switch
Signal
The PCM actuates the A/T clutch pressure control solenoid valves A, B, and C to control the clutch pressure. When
shifting between lower and higher gears, the clutch pressure regulated by the A/T clutch pressure control solenoid
valves A, B, and C engages and disengages the clutch smoothly.
The PCM receives input signals from the various sensors and switches, performs processing data, and outputs a
current to the A/T clutch pressure control solenoid valves A, B, and C.
(cont’d)
03/07/29 09:37:14 61S0X050_140_0284
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