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

8.1L (L18)

Ignition 1 Signal

Engine 1,2 Data

Volts

12.4 V

GEN L--Terminal Signal Command

Engine 2 Data

OK/No Output

OK

GEN F--Terminal Signal

Engine 2 Data

%

0%

Ignition ON/Engine OFF

6.5L (L65 Diesel)

Ignition 1 Signal

Engine 2 Data

Volts

12.4 V