GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Ignition 1 voltage

Engine 1, 2

Volts

9-16 v

Generator L Terminal Command

Engine 2

On/Off

On

Generator F Terminal

Engine 2

%

10-90%