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

Power and Ground


Object Number: 743054  Size: FS
Master Electrical Component List
Engine Control Module Description
MIL Control and Serial Data
OBD II Symbol Description Notice
B+ Bus Bar
IGNITION, RUN, and START Bus Bar
IGN 1 Relay, ECM I, FUEL HT, ENG 1, IGN E, ECMRPV, and INJ B Fuses - Diesel
AIR, RADIO, ECM B, FRT HVAC, and CIGAR Fuses
RTD, RDO AMP, CRANK, and IGN 0 Fuses
RTD, RDO AMP, CRANK, and IGN 0 Fuses
G105 - Diesel
Figure 2:

MIL Control and Serial Data


Object Number: 743056  Size: FS
Master Electrical Component List
Engine Control Module Description
Engine Data Sensors - Pressure and Temperature
Power and Ground
OBD II Symbol Description Notice
IGNITION, RUN, and START Bus Bar
SP205
IGN 1, AIR BAG, and SEO IGN Fuses
Power and Ground
Park/Neutral Position (PNP) Switch and TCM
Park/Neutral Position (PNP) Switch and TCM
Figure 3:

Engine Data Sensors - Pressure and Temperature


Object Number: 743058  Size: FS
Master Electrical Component List
Engine Control Module Description
Engine Data Sensors - EGR and Vacuum - California Emissions Only
MIL Control and Serial Data
OBD II Symbol Description Notice
IGNITION, RUN, and START Bus Bar
Engine Data Sensors - EGR and Vacuum - California Emissions Only
Engine Data Sensors - EGR and Vacuum - California Emissions Only
Figure 4:

Engine Data Sensors - EGR and Vacuum - California Emissions Only


Object Number: 743060  Size: FS
Master Electrical Component List
Engine Control Module Description
Engine Data Sensors - Pedal Position
Engine Data Sensors - Pressure and Temperature
OBD II Symbol Description Notice
IGNITION, RUN, and START Bus Bar
Engine Data Sensors - Pressure and Temperature
IGN 1 Relay, ECM I, FUEL HT, ENG 1, IGN E, ECMRPV, and INJ B Fuses - Diesel
IGN 1 Relay, ECM I, FUEL HT, ENG 1, IGN E, ECMRPV, and INJ B Fuses - Diesel
Figure 5:

Engine Data Sensors - Pedal Position


Object Number: 764209  Size: FS
Master Electrical Component List
Engine Control Module Description
Engine Data Sensors - VSS and Injection Timing Controls
Engine Data Sensors - EGR and Vacuum - California Emissions Only
OBD II Symbol Description Notice
Figure 6:

Engine Data Sensors - VSS and Injection Timing Controls


Object Number: 743063  Size: FS
Master Electrical Component List
Engine Control Module Description
Engine Data Sensors - Glow Plug Controls - All Except California Emissions
Engine Data Sensors - Pedal Position
OBD II Symbol Description Notice
Gauges, VSS, and Engine Oil Signals
Gauges, VSS, and Engine Oil Signals
Vehicle Speed Signal and 4WD Low Signal
G106 - Diesel
Figure 7:

Engine Data Sensors - Glow Plug Controls - All Except California Emissions


Object Number: 743064  Size: FS
Master Electrical Component List
Engine Control Module Description
Engine Data Sensors - Glow Plug Controls - w/California Emissions Only
Engine Data Sensors - VSS and Injection Timing Controls
OBD II Symbol Description Notice
IGNITION, RUN, and START Bus Bar
IGNITION, RUN, and START Bus Bar
IGNITION, RUN, and START Bus Bar
IGN 1, AIR BAG, and SEO IGN Fuses
Indicators and Illumination Lamps
G102, G103, and G104 - Diesel
Figure 8:

Engine Data Sensors - Glow Plug Controls - w/California Emissions Only


Object Number: 743066  Size: FS
Master Electrical Component List
Engine Control Module Description
Fuel Controls - Fuel Pump Controls
Engine Data Sensors - Glow Plug Controls - All Except California Emissions
OBD II Symbol Description Notice
IGNITION, RUN, and START Bus Bar
IGNITION, RUN, and START Bus Bar
IGNITION, RUN, and START Bus Bar
IGN 1, AIR BAG, and SEO IGN Fuses
Indicators and Serial Data
Figure 9:

Fuel Controls - Fuel Pump Controls


Object Number: 743068  Size: FS
Master Electrical Component List
Engine Control Module Description
Fuel Controls - Water In Fuel, Fuel Temperature, and Fuel Pressure
Engine Data Sensors - Glow Plug Controls - w/California Emissions Only
OBD II Symbol Description Notice
B+ Bus Bar
G106 - Diesel
G106 - Diesel
AIR, RADIO, ECM B, FRT HVAC, and CIGAR Fuses
Fuel Gauge and Fuel Pump and Sender Assembly
G106 - Diesel
G100 and G110
G403
Figure 10:

Fuel Controls - Water In Fuel, Fuel Temperature, and Fuel Pressure


Object Number: 743070  Size: FS
Master Electrical Component List
Engine Control Module Description
Fuel Controls - Injector and Pressure Controls
Fuel Controls - Fuel Pump Controls
OBD II Symbol Description Notice
IGNITION, RUN, and START Bus Bar
AIR, RADIO, ECM B, FRT HVAC, and CIGAR Fuses
IGN 1 Relay, ECM I, FUEL HT, ENG 1, IGN E, ECMRPV, and INJ B Fuses - Diesel
SP205
G102, G103, and G104 - Diesel
G102, G103, and G104 - Diesel
Figure 11:

Fuel Controls - Injector and Pressure Controls


Object Number: 743073  Size: FS
Master Electrical Component List
Engine Control Module Description
Fuel Controls - Fuel Injectors
Fuel Controls - Water In Fuel, Fuel Temperature, and Fuel Pressure
OBD II Symbol Description Notice
IGN 1 Relay, ECM I, FUEL HT, ENG 1, IGN E, ECMRPV, and INJ B Fuses - Diesel
G102, G103, and G104 - Diesel
G102, G103, and G104 - Diesel
Figure 12:

Fuel Controls - Fuel Injectors


Object Number: 855486  Size: FS
Master Electrical Component List
Engine Control Module Description
Controlled/Monitored Subsystem References
Fuel Controls - Injector and Pressure Controls
OBD II Symbol Description Notice
Figure 13:

Controlled/Monitored Subsystem References


Object Number: 855487  Size: FS
Master Electrical Component List
Engine Control Module Description
Transmission Controls - A/T
Fuel Controls - Fuel Injectors
OBD II Symbol Description Notice
A/C Compressor Controls
A/C Compressor Controls
Primary Air Delivery Controls - Recirculation Actuator (Uplevel Pickup and All Utilities)
Cruise Control Module (CCM) and Cruise Control On/Off Switch
Backup Lamps Schematics - Pickup
Charging - Diesel Dual Generator
Charging - Diesel Dual Generator
4WD and ATC Fuse, Transfer Case Encoder Motor
Power, Ground, Serial Data - w/o Traction Assist
Power, Ground, Serial Data - w/o Traction Assist
Gauges, VSS, and Engine Oil Signals
Engine Cooling Schematics
Figure 14:

Transmission Controls - A/T


Object Number: 855490  Size: FS
Master Electrical Component List
Engine Control Module Description
Controlled/Monitored Subsystem References
OBD II Symbol Description Notice
Park/Neutral Position (PNP) Switch and TCM
Power, Ground, and Stop Lamp Switch TCC Signal Circuit
Park/Neutral Position (PNP) Switch and TCM
Park/Neutral Position (PNP) Switch and TCM
Figure 15:

Power Take-Off


Object Number: 892149  Size: FS