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

(Gasoline Engines Only)

Ignition 1 Signal

Engine 1, 2 Data

Volts

9-14 V

GEN L--Terminal Signal Command

Engine 2 Data

OK/No Output

OK

GEN F--Terminal Signal

Engine 2 Data

%

10-90%

Ignition ON/Engine OFF

(6.6L LB7 Diesel)

Ignition 1 Signal

Engine 2 Data

Volts

9-14 V