Honda Odyssey 2004. Manual — part 158
20
Power Flow (cont’d)
D4 or D3 Position in 3rd gear
14-26
Automatic Transmission
System Description (cont’d)
MAINSHAFT
COUNTERSHAFT
SECONDARY
SHAFT
TORQUE CONVERTER
FINAL DRIVEN GEAR
FINAL DRIVE GEAR
MAINSHAFT
3RD GEAR
3RD CLUTCH
COUNTERSHAFT
3RD GEAR
• Hydraulic pressure is applied to the 3rd clutch, then the 3rd clutch engages the mainshaft 3rd gear with the
mainshaft.
• The mainshaft 3rd gear drives the countershaft 3rd gear and the countershaft.
• Power is transmitted to the final drive gear, which in turn drives the final driven gear.
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08
D4 Position in 4th gear
14-27
MAINSHAFT
COUNTERSHAFT
TORQUE CONVERTER
FINAL DRIVEN GEAR
FINAL DRIVE GEAR
MAINSHAFT
4TH GEAR
4TH CLUTCH
COUNTERSHAFT
4TH GEAR
REVERSE
SELECTOR HUB
• Hydraulic pressure is applied to the servo valve to engage the reverse selector with the countershaft 4th gear while
the shift lever is in the forward range (D4, D3, 2, and 1 position).
• Hydraulic pressure is also applied to the 4th clutch, then the 4th clutch engages the mainshaft 4th gear with the
mainshaft.
• The mainshaft 4th gear drives the countershaft 4th 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.
(cont’d)
03/07/29 09:29:22 61S0X050_140_0030
09
Power Flow (cont’d)
R Position
14-28
Automatic Transmission
System Description (cont’d)
MAINSHAFT
COUNTERSHAFT
TORQUE CONVERTER
FINAL DRIVEN GEAR
FINAL DRIVE GEAR
MAINSHAFT
REVERSE GEAR
4TH CLUTCH
COUNTERSHAFT
REVERSE GEAR
REVERSE
SELECTOR HUB
REVERSE SELECTOR
SERVO VALVE
SHIFT FORK
COUNTERSHAFT
REVERSE SELECTOR
HUB
REVERSE SELECTOR
REVERSE IDLER GEAR
COUNTERSHAFT
REVERSE GEAR
• 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 4th clutch, then the 4th 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.
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*01
S0X4AA0E10410600000CAAT03
Electronic Control System
Functional Diagram
14-29
Throttle Position Sensor
Signal
Engine Coolant Temperature
Sensor Signal
MULTIPLEX
CONTROL UNIT,
DRIVER’S
D4 Indicator
Self-Diagnosis Signal
PCM
PGM-FI
Control System
A/T Control System
Shift Control
Lock-up Control
Self-Diagnosis
Function
Data Link Connector
Shift Solenoid Valve B
Shift Solenoid Valve A
Shift Solenoid Valve C
Automatic Transaxle Clutch
Pressure Control Solenoid
Valve A
Automatic Transaxle Clutch
Pressure Control Solenoid
Valve B
2nd Clutch Pressure
Switch
3rd Clutch Pressure
Switch
Torque Converter Clutch
Solenoid Valve
Mainshaft Speed Sensor
Signal
Countershaft Speed
Sensor Signal
P
R
N
D4
D3
2
1
The electronic control system consists of the powertrain control module (PCM), sensors, and six solenoid valves.
Shifting and lock-up are electronically controlled for comfortable driving under all conditions. The PCM is located
below the dashboard, under the front lower panel behind the center console.
(cont’d)
03/07/29 09:29:23 61S0X050_140_0032
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