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

Generator L Terminal Signal

Engine 2

OK/No Output

OK

Generator F Terminal Signal

Engine 2

%

10 - 90%

Ignition 1 Signal

Engine 1,2,3

volts

9.6 - 14.4v