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

Power, Ground, Data Link, and MIL


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Figure 2:

5-Volt and Low Reference


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Figure 3:

Engine Data Sensors - Pressure and Temperature


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Figure 4:

Engine Data Sensors - Oxygen Sensors


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Figure 5:

Engine Data Sensors - Electronic Throttle Controls


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Figure 6:

Ignition Controls - Sensors


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Figure 7:

Fuel Controls - Fuel Pump Controls and Fuel Injectors


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Figure 8:

Ignition Controls - Ignition System


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Figure 9:

Fuel Controls - EVAP Controls


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Figure 10:

Controlled/Monitored Subsystem References


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