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

Module Power, Ground, Serial Data, and MIL


Object Number: 1430673  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Fuse Block - Underhood Powertrain Relay - 1 of 2
OBD II Symbol Description Notice
B+ Bus - Underhood Fuse Block
Ignition Switch - ACCY/RUN and RUN/START Bus Bars, IGN B Fuse
BACK UP, BTSI, IGNE, TBC IGN1, and TRLR B/U Fuses
BACK UP, BTSI, IGNE, TBC IGN1, and TRLR B/U Fuses
Ignition Switch - ACCY/RUN/START, RUN, and START Bus Bars, IGN A and CRANK Fuses
FRT WPR, IGN 0, RAIN, TBC ACC, TBC IG, and TCM Fuses
Power, Ground, Serial Data, and MIL
FRT WPR, IGN 0, RAIN, TBC ACC, TBC IG, and TCM Fuses
G108
SP205
Power, Ground, Data Link Connector
Figure 2:

Fuse Block - Underhood Powertrain Relay - 1 of 2


Object Number: 1430676  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Fuse Block - Underhood Powertrain Relay - 2 of 2
Module Power, Ground, Serial Data, and MIL
OBD II Symbol Description Notice
ENG 1, INJA, INJB, O2A, O2B, and TAC Fuses - 5.3L
B+ Bus - Underhood Fuse Block
Figure 3:

Fuse Block - Underhood Powertrain Relay - 2 of 2


Object Number: 1430681  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Engine Data Sensors - 5-Volt and Low Reference
Fuse Block - Underhood Powertrain Relay - 1 of 2
OBD II Symbol Description Notice
ENG 1, INJA, INJB, O2A, O2B, and TAC Fuses - 5.3L
B+ Bus - Underhood Fuse Block
Figure 4:

Engine Data Sensors - 5-Volt and Low Reference


Object Number: 1430686  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Engine Data Sensors - MAF, Pressure, Temperature, and VSS
Fuse Block - Underhood Powertrain Relay - 2 of 2
OBD II Symbol Description Notice
Figure 5:

Engine Data Sensors - MAF, Pressure, Temperature, and VSS


Object Number: 1430689  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Engine Data Sensors - Oxygen Sensors
Engine Data Sensors - 5-Volt and Low Reference
OBD II Symbol Description Notice
Fuse Block - Underhood Powertrain Relay - 2 of 2
ENG 1, INJA, INJB, O2A, O2B, and TAC Fuses - 5.3L
ENG 1, INJA, INJB, O2A, O2B, and TAC Fuses - 5.3L
Gages
G108
Figure 6:

Engine Data Sensors - Oxygen Sensors


Object Number: 1430690  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Engine Data Sensors - Throttle Actuator Controls
Engine Data Sensors - MAF, Pressure, Temperature, and VSS
OBD II Symbol Description Notice
Fuse Block - Underhood Powertrain Relay - 2 of 2
Fuse Block - Underhood Powertrain Relay - 2 of 2
G108
Figure 7:

Engine Data Sensors - Throttle Actuator Controls


Object Number: 1430713  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Ignition Controls - Ignition System Coils 1, 3, 5, 7
Engine Data Sensors - Oxygen Sensors
OBD II Symbol Description Notice
Cruise Control 5.3L
Figure 8:

Ignition Controls - Ignition System Coils 1, 3, 5, 7


Object Number: 1430715  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Ignition Controls - Ignition System Coils 2, 4, 6, 8
Engine Data Sensors - Throttle Actuator Controls
OBD II Symbol Description Notice
Fuse Block - Underhood Powertrain Relay - 1 of 2
ENG 1, INJA, INJB, O2A, O2B, and TAC Fuses - 5.3L
G109
Figure 9:

Ignition Controls - Ignition System Coils 2, 4, 6, 8


Object Number: 1430717  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Ignition Controls - Sensors and Displacement On Demand Controls
Ignition Controls - Ignition System Coils 1, 3, 5, 7
OBD II Symbol Description Notice
Fuse Block - Underhood Powertrain Relay - 1 of 2
ENG 1, INJA, INJB, O2A, O2B, and TAC Fuses - 5.3L
G109
Figure 10:

Ignition Controls - Sensors and Displacement on Demand


Object Number: 1430725  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Fuel Controls - Fuel Pump Controls and Fuel Injectors
Ignition Controls - Ignition System Coils 2, 4, 6, 8
OBD II Symbol Description Notice
Fuse Block - Underhood Powertrain Relay - 2 of 2
ENG 1, INJA, INJB, O2A, O2B, and TAC Fuses - 5.3L
Engine Controls Schematic Icons
Figure 11:

Fuel Controls - Fuel Pump Controls and Fuel Injectors


Object Number: 1430733  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Fuel Controls - EVAP Controls
Ignition Controls - Sensors and Displacement On Demand Controls
OBD II Symbol Description Notice
Fuse Block - Underhood Powertrain Relay - 1 of 2
Fuse Block - Underhood Powertrain Relay - 1 of 2
AIR, COILS, EAP, ECM, HDM, HI HDLP-LT, HI HDLP-RT, LOW HDLP-RT, LOW HDLP-LT, PCMB, and TCB1 Fuses
G104, G105, and G107
ENG 1, INJA, INJB, O2A, O2B, and TAC Fuses - 5.3L
G201 - 2 of 2 and G305
Figure 12:

Fuel Controls - EVAP Controls


Object Number: 1430736  Size: FS
Master Electrical Component List
Evaporative Emission Control System Description
Control Module References
Controlled/Monitored Subsystem References
Fuel Controls - Fuel Pump Controls and Fuel Injectors
OBD II Symbol Description Notice
Fuse Block - Underhood Powertrain Relay - 2 of 2
B+ Bus - Underhood Fuse Block
AUX PWR1, AUX PWR2, RRHVAC, SUNROOF, TBC2, TBC3, TBC4, TBC5, and TCM/CANISTER Fuses
Fuel Gage
ENG 1, INJA, INJB, O2A, O2B, and TAC Fuses - 5.3L
Figure 13:

Controlled/Monitored Subsystem References


Object Number: 1430740  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Fuel Controls - EVAP Controls
OBD II Symbol Description Notice
Gages
Power, Ground, Serial Data, and Transfer Case Encoder Motor
Fuel Gage
Gages
Compressor Controls
Compressor Controls
Cooling Fan Controls
Charging System
Starting System
EBCM Power, Ground, Serial Data, Indicator, and Signal Circuits
Pressure Controls, Temperature, and VSS
Cooling Fan Controls