GM Service Manual Online
For 1990-2009 cars only

Shift Solenoid Valve State and Gear Ratio

Gear Range

Solenoid Valve (S1)

Solenoid Valve (S2)

Neutral Control Solenoid Valve (SN)

Lock-up Solenoid Valve (SLU)

Gear Ratio

Park, Neutral

ON

OFF

OFF

OFF

--

Reverse

ON

OFF

OFF

OFF

2.769:1

First

ON

OFF

OFF

OFF

2.807:1

Second

ON

ON

OFF

OFF

1.479:1

Third

OFF

ON

OFF

ON

1.000:1

Fourth

OFF

OFF

OFF

ON

0.735:1

The S1 and S2 shift solenoid valves are normally-closed.

The SN solenoid valve is normally-opened.