GM Service Manual Online
For 1990-2009 cars only

Range

Minimum Line Pressure (PSI)

Maximum Line Pressure (PSI)

D

65

118

L2

65

118

L1

95

160

 

Car coasting @ 30 mph; vacuum line connected; foot off throttle

Zero output shaft speed; vacuum line disconnected from the modulator; engine @ 1500 RPM