GM Service Manual Online
For 1990-2009 cars only
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Figure 1:

Module Power, Ground, Serial Data, and MIL
Object Number: 1967475 Size: FS
Figure 2:

5-Volt and Low Reference
Object Number: 1967476 Size: FS
Figure 3:

Engine Data Sensors - Pressure, Temperature, and Throttle Control
Object Number: 1967477 Size: FS
Figure 4:

Engine Data Sensors - HO2S
Object Number: 1967482 Size: FS
Figure 5:

Ignition Controls - Ignition System Coils 1, 3, 5, and 7
Object Number: 1967488 Size: FS
Figure 6:

Ignition Controls - Ignition System Coils 2, 4, 6, and 8
Object Number: 1967493 Size: FS
Figure 7:

Ignition Controls - Sensors
Object Number: 1967494 Size: FS
Figure 8:

Fuel Controls - Fuel Injectors, and Fuel Pump Controls
Object Number: 1967495 Size: FS
Figure 9:

Fuel Controls - EVAP Controls
Object Number: 1967496 Size: FS
Figure 10:

Monitored/Controlled Subsystem References
Object Number: 1967497 Size: FS