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

Module Power, Ground, Serial Data and MIL
Object Number: 2077218 Size: FS
Figure 2:

5-Volt and Low Reference - 1 of 2
Object Number: 2077220 Size: FS
Figure 3:

5-Volt and Low Reference - 2 of 2
Object Number: 2077221 Size: FS
Figure 4:

Engine Data Sensors - Pressure, Temperature, and Throttle Controls
Object Number: 2077222 Size: FS
Figure 5:

Engine Data Sensors - HO2S
Object Number: 2077223 Size: FS
Figure 6:

Ignition Controls - Ignition System Coils 1, 3, and 5 - LLT
Object Number: 2077225 Size: FS
Figure 7:

Ignition Controls - Ignition System Coils 1, 3, and 5 - LP1/LY7
Object Number: 2077226 Size: FS
Figure 8:

Ignition Controls - Ignition System Coils 2, 4, and 6 - LLT
Object Number: 2077228 Size: FS
Figure 9:

Ignition Controls - Ignition System Coils 2, 4, and 6 - LP1/LY7
Object Number: 2077229 Size: FS
Figure 10:

Ignition Controls - Sensors
Object Number: 2077230 Size: FS
Figure 11:

Fuel Controls - Fuel Injectors, Pressure and Fuel Pump Controls - LLT
Object Number: 2077231 Size: FS
Figure 12:

Fuel Controls - Fuel Injectors and Fuel Pump Controls - LP1/LY7
Object Number: 2077232 Size: FS
Figure 13:

Fuel Controls - EVAP Controls and Manifold Tuning
Object Number: 2077233 Size: FS
Figure 14:

Monitored/Controlled Subsystem References
Object Number: 2077234 Size: FS