Overdrive Range, 3-2 Downshift

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Similar to a forced 4-3 downshift, a forced 3-2 downshift can occur because of minimum throttle (coastdown conditions), heavy throttle or increased engine load. In order to achieve a forced 3-2 downshift, the PCM energizes the 2-3 shift solenoid valve and the following changes occur:

Energized b...

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Document Title: Overdrive Range, 3-2 Downshift

forced

downshift

throttle

engine

order

shift

solenoid

valve

signalb

fluid

exhausting

pressure

circuit

moves

position

past

signal

servo

feed

clutch

accumulator

exhaust

band

checkball

checkball

orifice

rate

apply

spring

force

control

faster

vehicle

speed

lower

actuator

limit

shift valve

fluid pressure

fluid circuit

fluid exhausts

signal fluid

clutch fluid

accumulator fluid

apply band

band apply

control valve

actuator feed

feed limit

pressure control

fluid exhaust clutch

clutch fluid exhausts

exhausting clutch fluid

clutch fluid circuit

control solenoid valve

solenoid valve position

actuator feed limit

fluid pressure control

accumulator exhaust fluid