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

ECM Power, Ground, Serial Data, and MIL
Object Number: 2009978 Size: FS
Figure 2:

Engine Data Sensors - 5-Volt Reference Bus
Object Number: 2009979 Size: FS
Figure 3:

Engine Data Sensors - Low Reference Bus
Object Number: 2009981 Size: FS
Figure 4:

Engine Data Sensors - Pressure, Temperature, MAF, VSS
Object Number: 2009982 Size: FS
Figure 5:

Engine Data Sensors - Oxygen Sensors
Object Number: 2009983 Size: FS
Figure 6:

Engine Data Sensors - Electronic Throttle Controls
Object Number: 2009984 Size: FS
Figure 7:

Ignition Controls - Bank 1 Ignition Coils
Object Number: 2009985 Size: FS
Figure 8:

Ignition Controls - Bank 2 Ignition Coils
Object Number: 2009986 Size: FS
Figure 9:

Ignition Controls - CMP Sensors and Solenoids
Object Number: 2009987 Size: FS
Figure 10:

Ignition Controls - CKP, Knock Sensors and IMRC Solenoid
Object Number: 2009988 Size: FS
Figure 11:

Fuel Controls - Fuel Pump and Injectors
Object Number: 2009989 Size: FS
Figure 12:

Fuel Controls - EVAP Controls
Object Number: 2009990 Size: FS
Figure 13:

Controlled/Monitored Subsystem References
Object Number: 2009991 Size: FS