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 2

On/Off

Off

GEN F-Terminal Signal

Engine Data 2

OK/No Output

No Output

GEN L-Terminal Signal Command

Engine Data 2

%

0%

Ignition 1 Signal

Engine Data 1,2

Volts

12.6 V

Starter Enable Relay Circuit Status

Output Driver Data

Fault/OK/Invalid State

OK

Starter Relay Command

Engine Data 2

Disabled/Enabled

Disabled

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Battery Voltage

Data

Volts

12.6 Volts

Instrument Panel Cluster (IPC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Crank

Data

Yes/No

No

Volt Lamp

Inputs

On/Off

Off