Overdrive Range, 4-3 Downshift

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When the transmission is operating in fourth gear, a forced 4-3 downshift occurs if there is a significant increase in throttle position. At minimum throttle, the vehicle speed decreases gradually (coastdown) and the PCM commands a 4-3 downshift. The PCM also initiates a forced 4-3 downshift when...

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Document Title: Overdrive Range, 4-3 Downshift

transmission

fourth

gear

forced

downshift

throttle

position

shift

solenoid

valve

opens

fluid

pressure

spring

force

band

moves

this

signal

past

relay

sequence

release

accumulator

third

orificed

exhaust

servo

circuit

assembly

apply

piston

torque

shift valve

fluid pressure

signal fluid

relay valve

sequence valve

accumulator fluid

third gear

gear position

fluid circuit

fluid exhausts solenoid

exhausts solenoid shift

solenoid shift valve

fluid pressure spring

fluid pressure exhausted

spring force moves

position valve blocks

signal fluid pressure

third gear position

orificed accumulator fluid

accumulator fluid pressure

servo feed fluid

accumulator fluid exhausts

torque signal fluid