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

Module Power, Ground, Serial Data, and MIL


Object Number: 1908913  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Engine Data Sensors - 5-Volt and Low Reference
ENGINE and PCM-1 Fuses/Circuit Breakers
ENGINE and PCM-1 Fuses/Circuit Breakers
ENGINE and PCM-1 Fuses/Circuit Breakers
TRANS Fuse/Circuit Breaker
TRANS Fuse/Circuit Breaker
TRANS Fuse/Circuit Breaker
A/C COMP, HTD FUEL, PCM-B and RR DEFOG Fuses
A/C COMP, HTD FUEL, PCM-B and RR DEFOG Fuses
G203 - 2 of 4
G100 - L18
AIRBAG, GAGES, LT REAR TURN/STOP, and RT REAR TURN/STOP Fuses/Circuit Breakers
AIRBAG, GAGES, LT REAR TURN/STOP, and RT REAR TURN/STOP Fuses/Circuit Breakers
Instrument Panel Cluster - 1 of 2
Splice Pack SP203
Figure 2:

Engine Data Sensors - 5-Volt and Low Reference


Object Number: 1908918  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Fuse Block - Underhood and IGN-A Relay
Module Power, Ground, Serial Data and MIL
Figure 3:

Fuse Block - Underhood and IGN-A Relay


Object Number: 1908923  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Engine Data Sensors - VSS
Engine Data Sensors - 5-Volt and Low Reference
ENGINE and PCM-1 Fuses/Circuit Breakers
ENGINE and PCM-1 Fuses/Circuit Breakers
ENGINE and PCM-1 Fuses/Circuit Breakers
ENGINE and PCM-1 Fuses/Circuit Breakers
G100 - L18
ENG-1 and ENG-4 Fuses - L18/LMM
ENG-1 and ENG-4 Fuses - L18/LMM
G203 - 2 of 4
Figure 4:

Engine Data Sensors - VSS


Object Number: 1908930  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Engine Data Sensors - HO2S
Fuse Block - Underhood and IGN-A Relay
L18
Instrument Panel Cluster - 2 of 2
Figure 5:

Engine Data Sensors - HO2S


Object Number: 1908934  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Engine Data Sensors - Electronic Throttle Controls
Engine Data Sensors - VSS
ENG-2, ENG-3, and O2S Fuses - L18
AXL/4WD, BRK, HYD/AIR BRK, and HTR/AC Fuses/Circuit Breakers
AXL/4WD, BRK, HYD/AIR BRK, and HTR/AC Fuses/Circuit Breakers
G101 - 1 of 2
Figure 6:

Engine Data Sensors - Electronic Throttle Controls


Object Number: 1908938  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Ignition Controls - Ignition Systems - 1 of 2
Engine Data Sensors - HO2S
ENGINE and PCM-1 Fuses/Circuit Breakers
ENGINE and PCM-1 Fuses/Circuit Breakers
ENGINE and PCM-1 Fuses/Circuit Breakers
G203 - 2 of 4
AXL/4WD, BRK, HYD/AIR BRK, and HTR/AC Fuses/Circuit Breakers
AXL/4WD, BRK, HYD/AIR BRK, and HTR/AC Fuses/Circuit Breakers
G101 - 1 of 2
Figure 7:

Ignition Controls - Ignition Systems 1 of 2


Object Number: 1908945  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Ignition Controls - Ignition Systems - 2 of 2
Engine Data Sensors - Electronic Throttle Controls
ENGINE and PCM-1 Fuses/Circuit Breakers
ENGINE and PCM-1 Fuses/Circuit Breakers
ENGINE and PCM-1 Fuses/Circuit Breakers
G100 - L18
ENGINE and PCM-1 Fuses/Circuit Breakers
ENG-2, ENG-3, and O2S Fuses - L18
ENG-2, ENG-3, and O2S Fuses - L18
Ignition Controls - Ignition Systems - 2 of 2
Figure 8:

Ignition Controls - Ignition Systems 2 of 2


Object Number: 1908948  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Ignition Systems - CKP, CMP, and KS Sensors
Ignition Controls - Ignition Systems - 1 of 2
Ignition Controls - Ignition Systems - 1 of 2
G100 - L18
Figure 9:

Ignition System - CKP, CMP, and KS Sensors


Object Number: 1908955  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Fuel Controls - Fuel Pump Controls
Ignition Controls - Ignition Systems - 2 of 2
Figure 10:

Fuel Controls - Fuel Pump Controls


Object Number: 1908969  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Fuel Controls - Fuel Injectors
Ignition Systems - CKP, CMP, and KS Sensors
FUEL Fuse/Circuit Breaker - L18/LMM, PCV Circuit Breaker - LF8, and ECM-B Circuit Breaker - LF6
G100 - L18
G112, G113, G203 - 4 of 4, G204, G205, and G400
G200, G202, and G203 - 1 of 4
Figure 11:

Fuel Controls - Fuel Injectors


Object Number: 1908971  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Device Controls - EGR Valve
Fuel Controls - Fuel Pump Controls
ENG-2, ENG-3, and O2S Fuses - L18
ENG-2, ENG-3, and O2S Fuses - L18
Figure 12:

Device Controls - EGR Valve


Object Number: 1908973  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Controlled/Monitored Subsystem References
Fuel Controls - Fuel Injectors
ENG-1 and ENG-4 Fuses - L18/LMM
Instrument Panel Cluster - 2 of 2
A/C Compressor Controls - L18/LMM
Starting System L18/LMM
Figure 13:

Controlled/Monitored Subsystem References


Object Number: 1908978  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Control Module References
Device Controls - EGR Valve
w/o LF6 2 of 2
w/o LF6 1 of 2
HPZ with Manual Transmision
Engine Mechanical Schematics - L18
Engine Cooling Schematics
Charging System L18/LMM
Starting System L18/LMM
Module Power, Ground, Serial Data, MIL, VSS, and Torque Controls
L18