Honda 2004 Odyssey, Service Manual

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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.
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