Honda Odyssey 2004. Manual — part 159
*05
Electronic Control System (cont’d)
Electronic Controls Location
14-30
Automatic Transmission
System Description (cont’d)
KEY INTER LOCK SOLENOID
MULTIPLEX CONTROL
UNIT, DRIVER’S
SHIFT LOCK SOLENOID
PARK PIN SWITCH
POWERTRAIN CONTROL MODULE (PCM)
COUNTERSHAFT SPEED SENSOR
2ND CLUTCH PRESSURE SWITCH
TRANSMISSION RANGE SWITCH
MAINSHAFT SPEED
SENSOR
3RD CLUTCH PRESSURE
SWITCH
SHIFT SOLENOID
VALVE B
TORQUE CONVERTER CLUTCH
SOLENOID VALVE/
SHIFT SOLENOID VALVE A
A/T CLUTCH PRESSURE
CONTROL SOLENOID
VALVE B
SHIFT SOLENOID
VALVE C
A/T CLUTCH PRESSURE
CONTROL SOLENOID
VALVE A
03/07/29 09:29:24 61S0X050_140_0033
Shift Control
Lock-up Control
14-31
Shifting is related to engine torque through the solenoid valves, which are controlled by the PCM. The PCM instantly
determines which gear should be selected by various signals sent from sensors, and actuates the shift solenoid valves
A, B, and C to control shifting. Also, a grade logic control system has been adopted to control shifting in the D4 and D3
positions while the vehicle is ascending or descending a slope, or reducing speed.
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
D4, D3
Shifting from the N position
ON
ON
ON
Stays in 1st
OFF
ON
ON
Shifting gears between 1st and 2nd
ON
ON
ON
Stays in 2nd
ON
ON
OFF
Shifting gears between 2nd and 3rd
ON
OFF
OFF
Stays in 3rd
ON
OFF
ON
D4
Shifting gears between 3rd and 4th
OFF
OFF
ON
Stays in 4th
OFF
OFF
OFF
2
2nd
ON
ON
OFF
1
1st
OFF
ON
ON
R
Shifting from the P and N position
OFF
ON
ON
Stays in reverse
OFF
ON
OFF
Reverse inhibit
OFF
ON
ON
P
Park
OFF
ON
OFF
N
Neutral
OFF
ON
OFF
The torque converter clutch solenoid valve controls modulator pressure to switch the lock-up shift valve and lock-up
ON and OFF. The PCM controls the torque converter clutch solenoid valve and the A/T clutch pressure control solenoid
valves A and B. When the torque converter clutch solenoid valve is turned ON, the condition of lock-up starts. The A/T
clutch pressure control solenoid valves A and B regulate A/T clutch pressure control solenoid pressure and apply the
pressure to the lock-up control valve and the lock-up timing valve. The lock-up control mechanism operates in 3rd and
4th gear in D4, and in 3rd gear in D3 positions.
(cont’d)
03/07/29 09:29:24 61S0X050_140_0034
*02
Electronic Control System (cont’d)
Grade Logic Control System
14-32
Automatic Transmission
System Description (cont’d)
Engine Coolant
Temperature Sensor
Countershaft Speed
Sensor
Throttle Position
Sensor
Transmission Range
Switch
Driving resistance
Coolant temperature
D4 or D3 Position
SENSORS/SWITCHES
SIGNALS DETECTED
PCM
Judgment of controlling area
Calculation
of actual
acceleration
Detection of
standard
acceleration
(in Memory)
Calculation
of decelera-
tion
Calculation of gradient
Selection of shifting mode
• Normal mode (Flat road mode)
• Ascending mode
• Gradual ascending mode
• Medium ascending mode
• Steep ascending mode
• Descending mode
• Gradual descending mode
• Steep descending mode
• Deceleration mode
Automatic 4-speed transmission
Dr
iv
ing
C
ond
iti
ons
How it works:
The PCM compares actual driving conditions with memorized driving conditions, based on the input from the
countershaft speed sensor, the throttle position sensor, the engine coolant temperature 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, or reducing speed.
03/07/29 09:29:25 61S0X050_140_0035
*03
*04
Grade Logic Control: Ascending Control
Grade Logic Control: Descending Control
Grade Logic Control: Deceleration Control
14-33
100%
50
0
: MEDIUM ASCENDING MODE
62 mph
(100 km/h)
2ND 3RD
3RD 4TH
ASCENDING MODE: Upshift Schedule
: FLAT ROAD MODE
: STEEP ASCENDING MODE
Vehicle speed
: GRADUAL ASCENDING MODE
2ND
1ST
0
100%
50
62 mph
(100 km/h)
2ND
3RD
3RD
4TH
DESCENDING MODE: Downshift Schedule
: FLAT ROAD MODE
: GRADUAL DESCENDING MODE
: STEEP DESCENDING MODE
Vehicle speed
2ND
1ST
Thr
ot
tl
e
ope
ning
T
h
ro
tt
le
o
p
en
ing
When the PCM determines that the vehicle is climbing a hill in the D4 and D3 positions, the system extends the
engagement area of 2nd gear and 3rd gear to prevent the transmission from frequently shifting between 2nd and 3rd
gears, and between 3rd and 4th gears, so the vehicle can run smooth and have more power when needed.
NOTE: Shift schedules stored in the PCM between 2nd and 3rd gears, and between 3rd and 4th gears, 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 D4 and D3 positions, the shift-up speed from 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 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 two descending modes with different 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 4th gear, and you are decelerating when you are applying the brakes on a steep hill, the transmission will
downshift to 3rd 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 27 mph (43 km/h), the PCM shifts the transmission from 4th to 2nd earlier than normal to cope with
upcoming acceleration.
(cont’d)
03/07/29 09:29:25 61S0X050_140_0036
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