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

Module Power, Ground, Serial Data and MIL


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Figure 2:

Engine Data Sensors - 5-Volt and Low References - 1 of 2


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Figure 3:

Engine Data Sensors - 5-Volt and Low References - 2 of 2


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Figure 4:

Engine Data Sensors - Temperature and MAF


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Figure 5:

Engine Data Sensors - Pressure


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Figure 6:

EGR and Turbocharger Controls


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Figure 7:

Pedal Position and Injector Timing


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Figure 8:

Engine Data Sensors - Glow Plug Controls and Intake Air Heater


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Figure 9:

Fuel Controls - Fuel Pump, Temperature and Pressure Controls


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Figure 10:

Fuel Controls - Fuel Injectors


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Figure 11:

Controlled/Monitored Subsystem References


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