Honda 2004 Odyssey Service Manual page 646

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Grade Logic Control: Ascending Control

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.

Grade Logic Control: Descending Control

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.

Grade Logic Control: Deceleration Control

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.

ASCENDING MODE: Upshift Schedule

: FLAT ROAD MODE

: GRADUAL ASCENDING MODE

: MEDIUM ASCENDING MODE

: STEEP ASCENDING MODE

Vehicle speed

DESCENDING MODE: Downshift Schedule

: FLAT ROAD MODE

: GRADUAL DESCENDING MODE

: STEEP DESCENDING MODE

Vehicle speed

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