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 Signal

Engine Data 1

Yes/No

No

Ignition 1 Signal

Engine Data 1, Engine Data 2

Volts

9-14 V

GEN L-Terminal Signal Command

Engine 2 Data

On/Off

Off

GEN F-Terminal Signal

Engine 2 Data

%

10-90%

TR Sw.

Engine Data 2

Park, Reverse, Neutral, Drive 4, Drive 3, Drive 2, Drive 1, Invalid

Park