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

Crank Request

Engine 3

Yes/No

No

Generator L Terminal

Engine 1,3

OK/No Output

OK

Generator PWM

Engine 1

%

5%

Starter Relay Status

Engine 2,3

Off/On

Off