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

Power, Ground, DLC, MIL Control, Engine Cooling and HVAC


Object Number: 687851  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Fuel Injectors 2, 4, 6 and 8
OBD II Symbol Description Notice
Underhood Electrical Center Bussing (1 of 2)
G106 and G105
01 Y-Car: Cooling Fan Schematics
Compressor Controls
Star Connectors
Temperature, Fuel and Oil Pressure Gauges
Compressor Controls
Compressor Controls
Figure 2:

Fuel Injectors 2, 4, 6 and 8


Object Number: 687853  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Fuel Injectors 1, 3, 5 and 7
Power, Ground, DLC, MIL Control, Engine Cooling and HVAC
OBD II Symbol Description Notice
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
G106 and G105
Underhood Electrical Center Bussing (2 of 2)
Figure 3:

Fuel Injectors 1, 3, 5 and 7


Object Number: 687855  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Ignition Coil/Modules 2, 4, 6 and 8 Power and Ground
Fuel Injectors 2, 4, 6 and 8
OBD II Symbol Description Notice
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
G106 and G105
Underhood Electrical Center Bussing (2 of 2)
Figure 4:

Ignition Coil/Modules 2, 4, 6 and 8 Power and Ground


Object Number: 687880  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Ignition Coil/Modules 1, 3, 5 and 7 Power and Ground
Fuel Injectors 1, 3, 5 and 7
OBD II Symbol Description Notice
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
G106 and G105
Underhood Electrical Center Bussing (2 of 2)
Figure 5:

Ignition Coil/Modules 1, 3, 5 and 7 Power and Ground


Object Number: 687872  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Ignition Control
Ignition Coil/Modules 2, 4, 6 and 8 Power and Ground
OBD II Symbol Description Notice
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
G106 and G105
Underhood Electrical Center Bussing (2 of 2)
Figure 6:

Ignition Control


Object Number: 687867  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Throttle Position (TP) and Accelerator Pedal Position (APP) Sensors
Ignition Coil/Modules 1, 3, 5 and 7 Power and Ground
OBD II Symbol Description Notice
Figure 7:

Throttle Position (TP) and Accelerator Pedal Position (APP) Sensors


Object Number: 687883  Size: FS
Master Electrical Component List
Throttle Actuator Control (TAC) System Description
Fuel Pump and Fuel Tank Pressure Sensor
Ignition Control
OBD II Symbol Description Notice
Figure 8:

Fuel Pump and Fuel Tank Pressure Sensor


Object Number: 687893  Size: FS
Master Electrical Component List
Fuel System Description
AIR System and Evaporative Emission (EVAP) Canister Purge Valve
Throttle Position (TP) and Accelerator Pedal Position (APP) Sensors
OBD II Symbol Description Notice
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
G106 and G105
G401
Temperature, Fuel and Oil Pressure Gauges
Figure 9:

AIR System and Evaporative Emission (EVAP) Canister Purge Valve


Object Number: 687897  Size: FS
Master Electrical Component List
Fuel System Description
Evaporative Emission (EVAP) Vent Valve Solenoid
Fuel Pump and Fuel Tank Pressure Sensor
OBD II Symbol Description Notice
Underhood Electrical Center Bussing (2 of 2)
G101 and G102
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
Underhood Electrical Center Bussing (2 of 2)
G106 and G105
Figure 10:

Evaporative Emission (EVAP) Vent Valve Solenoid


Object Number: 687900  Size: FS
Master Electrical Component List
Fuel System Description
Mass Air Flow (MAF) Sensor and Extended Brake Travel Signal
AIR System and Evaporative Emission (EVAP) Canister Purge Valve
OBD II Symbol Description Notice
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
G106 and G105
Underhood Electrical Center Bussing (2 of 2)
Transmission Valve Controls
01 Y-Car: Manual Transmission Schematics
Figure 11:

Mass Air Flow (MAF) Sensor and Extended Brake Travel Signal


Object Number: 687902  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Manifold Absolute Pressure (MAP), Engine Coolant Temperature(ECT) and Vehicle Speed Sensors and Engine Speed Output
Evaporative Emission (EVAP) Vent Valve Solenoid
OBD II Symbol Description Notice
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
Underhood Electrical Center Bussing (2 of 2)
Cruise Control Switch, Throttle Actuator Control Motor and Cruise Control Release Switch
G106 and G105
Torque Converter Clutch (TCC) Control Switch
G106 and G105
Figure 12:

Manifold Absolute Pressure (MAP), Engine Coolant Temperature(ECT) and Vehicle Speed Sensors and Engine Speed Output


Object Number: 687905  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Crankshaft Position (CKP), Camshaft Position (CMP) and Front and Rear Knock Sensors
Mass Air Flow (MAF) Sensor and Extended Brake Travel Signal
OBD II Symbol Description Notice
Figure 13:

Crankshaft Position (CKP), Camshaft Position (CMP) and Front and Rear Knock Sensors


Object Number: 688009  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Heated Oxygen Sensors
Manifold Absolute Pressure (MAP), Engine Coolant Temperature(ECT) and Vehicle Speed Sensors and Engine Speed Output
OBD II Symbol Description Notice
ESC and Traction/Suspension Control Switch
Cruise Control Switch, Throttle Actuator Control Motor and Cruise Control Release Switch
Starter
Traction Control Request, DLC, Torque and Steering Position Signals
Figure 14:

Heated Oxygen Sensors


Object Number: 688019  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Park Neutral Position and Backup Switch
Crankshaft Position (CKP), Camshaft Position (CMP) and Front and Rear Knock Sensors
OBD II Symbol Description Notice
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
G106 and G105
Figure 15:

Park Neutral Position and Backup Switch


Object Number: 688025  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Automatic Transmission
Heated Oxygen Sensors
OBD II Symbol Description Notice
G104
Figure 16:

Automatic Transmission


Object Number: 688035  Size: FS
Master Electrical Component List
Powertrain Control Module Description
Park Neutral Position and Backup Switch
OBD II Symbol Description Notice
Torque Converter Clutch (TCC) Control Switch
Torque Converter Clutch (TCC) Control Switch
Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch and Pressure Control Solenoid (PC SOL) Valve
01 Y-Car: Manual Transmission Schematics
01 Y-Car: Manual Transmission Schematics