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

Module Power, Ground, Serial Data, and MIL (LZ4)
Object Number: 2079799 Size: FS
Figure 2:

Engine Data Sensors - 5-Volt 1 and Low Reference (LZ4)
Object Number: 2079804 Size: FS
Figure 3:

Engine Data Sensors - Pressure and Temperature (LZ4)
Object Number: 2079811 Size: FS
Figure 4:

Engine Data Sensors - Heated Oxygen Sensors (HO2S) (LZ4)
Object Number: 2079814 Size: FS
Figure 5:

Engine Data Sensors - Throttle Actuator Controls (LZ4)
Object Number: 2079818 Size: FS
Figure 6:

Ignition Controls - Ignition System (LZ4)
Object Number: 2079822 Size: FS
Figure 7:

Ignition Controls - CKP and KS Sensors (LZ4)
Object Number: 2079825 Size: FS
Figure 8:

Ignition Controls - CMP Sensors and Actuator Solenoids (LZ4)
Object Number: 2079832 Size: FS
Figure 9:

Fuel Controls - Fuel Injectors (LZ4)
Object Number: 2079836 Size: FS
Figure 10:

Fuel Controls - Fuel Pump Controls (LZ4)
Object Number: 2079841 Size: FS
Figure 11:

Fuel Controls - Evaporative Emissions (EVAP) Controls (LZ4)
Object Number: 2079846 Size: FS
Figure 12:

Controlled/Monitored Subsystem References (LZ4)
Object Number: 2079848 Size: FS