Honda Odyssey 2004. Manual — part 220
07
Power Flow (cont’d)
D Position in 5th gear
14-274
Automatic Transmission
System Description (cont’d)
MAINSHAFT
COUNTERSHAFT
SECONDARY SHAFT
TORQUE CONVERTER
FINAL DRIVE GEAR
MAINSHAFT
3RD GEAR
FINAL DRIVEN GEAR
5TH CLUTCH
MAINSHAFT
5TH GEAR
COUNTERSHAFT 5TH GEAR
ONE-WAY
CLUTCH
• Hydraulic pressure is applied to the servo valve to engage the reverse selector with the countershaft 5th gear while
the shift lever is in the forward range (D, D3, 2, and 1 position).
• Hydraulic pressure is also applied to the 5th clutch, then the 5th clutch engages the mainshaft 5th gear with the
mainshaft.
• The mainshaft 5th gear drives the countershaft 5th gear, which drives the reverse selector hub and the countershaft.
• Power is transmitted to the final drive gear, which in turn drives the final driven gear.
• Hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of 5th gear exceeds that of 1st gear,
power from 1st gear cut off at the one-way clutch.
03/07/29 09:37:10 61S0X050_140_0277
33
R Position
14-275
MAINSHAFT
COUNTERSHAFT
SECONDARY SHAFT
TORQUE CONVERTER
FINAL DRIVE GEAR
MAINSHAFT
3RD GEAR
FINAL DRIVEN GEAR
5TH CLUTCH
COUNTERSHAFT
REVERSE GEAR
MAINSHAFT
REVERSE GEAR
REVERSE
SELECTOR
REVERSE
SELECTOR
HUB
SERVO VALVE
SHIFT FORK
REVERSE IDLER GEAR
COUNTERSHAFT
REVERSE GEAR
REVERSE SELECTOR
REVERSE
SELECTOR HUB
• Hydraulic pressure is applied to the servo valve to engage the reverse selector with the countershaft (reverse gear
while the shift lever is in the R position).
• Hydraulic pressure is also applied to the 5th clutch, then the 5th clutch engages the mainshaft reverse gear with the
mainshaft.
• The mainshaft reverse gear drives the countershaft reverse gear via the reverse idler gear.
• The rotation direction of the countershaft reverse gear is changed via the reverse idler gear.
• The countershaft reverse gear drives the countershaft via the reverse selector which drives the reverse selector hub.
• Power is transmitted to the final drive gear, which in turn drives the final driven gear.
03/07/29 09:37:11 61S0X050_140_0278
*01
S0X4AA1E10410600000CAAT03
Electronic Control System
Functional Diagram
14-276
Automatic Transmission
System Description (cont’d)
PCM
Engine RPM Signal
Throttle Position
Sensor Signal
Engine Coolant
Temperature Sensor Signal
Barometric Pressure
Sensor Signal
Manifold Absolute
Pressure Sensor Signal
Transmission
Range
Switch
Signal
Input Shaft (Mainshaft)
Speed Sensor Signal
Output Shaft (Countershaft)
Speed Sensor Signal
Brake Pedal Position
Switch Signal
PGM-FI Control
System
A/T Control System
Shift Control
Grade Logic Control
• Ascending control
Descending control
•
Clutch Pressure
Control
Lock-up Control
Gauge Assembly
A/T Gear Position Indicator
D Indicator
Shift Solenoid Valve A
Shift Solenoid Valve B
A/T Clutch Pressure
Control Solenoid Valve A
A/T Clutch Pressure
Control Solenoid Valve B
Multiplex
Control Unit
Shift Lock
Solenoid
Automatic
5-speed and
Reverse
Lock-up
Conditions
Lock-up
ON/OFF
Service Check Signal
ATF Temperature
Sensor Signal
3rd Clutch Transmission
Fluid Pressure Switch Signal
4th Clutch Transmission
Fluid Pressure Switch Signal
Self-diagnosis/
Fail-safe Function
Communication and
Output Function
Shift Lock Control
Shift Solenoid Valve C
A/T Clutch Pressure
Control Solenoid Valve C
Cruise Control Unit
Downshift Request Signal
Torque Converter
Clutch Solenoid Valve
Vehicle Speed Signal
Data Link Connector
Deceleration
control
•
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.
03/07/29 09:37:12 61S0X050_140_0279
13
*02
Electronic Control Location
14-277
POWERTRAIN CONTROL MODULE (PCM)
MULTIPLEX CONTROL
UNIT, DRIVER’S
OUTPUT SHAFT
(COUNTERSHAFT)
SPEED SENSOR
A/T CLUTCH PRESSURE
CONTROL SOLENOID
VALVE B
INPUT SHAFT
(MAINSHAFT)
SPEED SENSOR
3RD CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
SHIFT SOLENOID VALVE C
TORQUE CONVERTER
CLUTCH SOLENOID VALVE
A/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE C
4TH CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
ATF TEMPERATURE
SENSOR
TRANSMISSION
RANGE SWITCH
SHIFT SOLENOID VALVE A
SHIFT SOLENOID VALVE B
A/T CLUTCH PRESSURE
CONTROL SOLENOID
VALVE A
(cont’d)
03/07/29 09:37:12 61S0X050_140_0280
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