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

Power, Ground, Serial Data, and MIL


Object Number: 1493955  Size: FS
Figure 2:

5-Volt and Low Reference Bussing


Object Number: 1199972  Size: FS
Figure 3:

Engine Data Sensors - Pressure and Temperature


Object Number: 1199974  Size: FS
Figure 4:

Heated Oxygen Sensors


Object Number: 1199976  Size: FS
Figure 5:

Ignition System


Object Number: 1199977  Size: FS
Figure 6:

Fuel Pump Controls


Object Number: 1199978  Size: FS
Figure 7:

Fuel Injectors


Object Number: 1199979  Size: FS
Figure 8:

EVAP and IAC Controls


Object Number: 1199980  Size: FS
Figure 9:

Controlled/Monitored Subsystem References


Object Number: 1199982  Size: FS
Figure 10:

Transmission Controls


Object Number: 1199984  Size: FS