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

PCM Powers and Grounds


Object Number: 826634  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Powertrain Control Module Bussing
OBDII Symbol Description Notice
Data Link Communication
Indicators and Communication
IGN BATT, IGN SW BATT2, Ignition Switch
IGN MOD, B/U LMP, PCM IGN, INJR, A/C BFC, AUTO TRANS, ABS IGN Fuses
AUX PWR/CIGAR, PRK LPS, and PCM BATT Fuses
SP102
Figure 2:

Powertrain Control Module Bussing


Object Number: 788900  Size: FS
Master Electrical Component List
Powertrain Control Module Description
MAP, ECT, IAT, TP, MAF
PCM Powers and Grounds
OBDII Symbol Description Notice
Figure 3:

MAP, ECT, IAT, TP and MAF


Object Number: 830320  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Heated Oxygen Sensors
Powertrain Control Module Bussing
OBDII Symbol Description Notice
IGN MOD, B/U LMP, PCM IGN, INJR, A/C BFC, AUTO TRANS, ABS IGN Fuses
Power and Communications
SP102
Charging System
Figure 4:

Heated Oxygen Sensors


Object Number: 830590  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Ignition Controls
MAP, ECT, IAT, TP, MAF
OBDII Symbol Description Notice
HTR A/C and ERLS Fuses
SP201
Figure 5:

Ignition Controls


Object Number: 782325  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Fuel Delivery and IAC
Heated Oxygen Sensors
OBDII Symbol Description Notice
IGN MOD, B/U LMP, PCM IGN, INJR, A/C BFC, AUTO TRANS, ABS IGN Fuses
Power and Communications
SP103
Indicators and Serial Data
Engine Controls Schematic Icons
Figure 6:

Fuel Delivery and IAC


Object Number: 782331  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Ignition Controls
Fuel Injectors
OBDII Symbol Description Notice
Indicators and Serial Data
IGN MOD, B/U LMP, PCM IGN, INJR, A/C BFC, AUTO TRANS, ABS IGN Fuses
SP103
SP301
A/C Compressor Controls
Figure 7:

Fuel Injectors


Object Number: 782330  Size: FS
Master Electrical Component List
Powertrain Control Module Description
EVAP and Fuel Controls
Fuel Delivery and IAC
OBDII Symbol Description Notice
IGN MOD, B/U LMP, PCM IGN, INJR, A/C BFC, AUTO TRANS, ABS IGN Fuses
Figure 8:

EVAP and Fuel Controls


Object Number: 830629  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Subsystem References
Fuel Injectors
OBDII Symbol Description Notice
HTR A/C and ERLS Fuses
SP201
Figure 9:

Subsystem References


Object Number: 830640  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Transmission References
EVAP and Fuel Controls
OBDII Symbol Description Notice
A/C Compressor Controls
Cooling Fans
Brake Switch and Inhibit Signals
Transmission Switches
Shift Solenoids
Figure 10:

Transmission References


Object Number: 827436  Size: FS
Subsystem References
Master Electrical Component List
Powertrain Control Module Description
Transmission Switches
Park Neutral Position (PNP) Switch
OBDII Symbol Description Notice