Vacuum Modulator Diagnosis

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Vacuum Modulator System (4T60-E)

The vacuum modulator system on the Hydra-Matic 4T60-E transaxle controls shift feel (may be soft or firm shifts) by sensing the changes in the engine load, which is indicated by the engine vacuum. The modulator does this by controlling the main line pressure boos...

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Document Tags

Document Title: Vacuum Modulator Diagnosis

vacuum

modulator

system

hydra

matic

transaxle

shift

soft

firm

engine

load

line

pressure

slipping

conditions

diagnosis

inchhg

drive

incorrect

harsh

upshifts

downshifts

reverse

throttle

slips

position

valve

following

install

gauge

check

kpa

orifice

inspect

operated

pump

plunger

perform

procedure

steps

connector

drains

leak

comparison

sleeve

engine vacuum

vacuum line

gauge line

check procedure

perform following

following steps

steps inspect

inspect vacuum

vacuum connector

modulator comparison

light throttle upshifts

rough manual downshifts

incorrect engine vacuum

perform following steps

following steps inspect

steps inspect vacuum

apply soap solution

modulator comparison gauge

modulator acceptable gauge

acceptable gauge line

inspect improperly routed