GM Service Manual Online
For 1990-2009 cars only

Transmission Fluid Pressure Manual Valve Position Switch Logic Gas

Range Signal

A

B

C

Park

HI

LOW

HI

Reverse

LOW

LOW

HI

Neutral

HI

LOW

HI

D4

HI

LOW

LOW

D3

HI

HI

LOW

D2

HI

HI

HI

D1

LOW

HI

HI

Invalid

LOW

HI

LOW

Invalid

LOW

LOW

LOW

LOW = 0 volts

HI = Ignition voltage

Transmission Fluid Pressure Manual Valve Position Switch Logic Diesel

Range Signal

A

B

C

Park

OFF

ON

OFF

Reverse

ON

ON

OFF

Neutral

OFF

ON

OFF

D4

OFF

ON

ON

D3

OFF

OFF

ON

D2

OFF

OFF

OFF

D1

ON

OFF

OFF

Illegal

ON

OFF

ON

Illegal

ON

ON

ON

ON = 0 volts

OFF = Ignition voltage