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

GEN L-Terminal Signal Command

Engine Data 2

%

0%

Generator Lamp Circuit

Output Driver Data

Fault/OK/Invalid State

OK

Generator Lamp Command

Engine Data 2

Yes/No

Yes

Ignition 1 Signal

Engine Data 1,2

Volts

12.6 V