GM Service Manual Online
For 1990-2009 cars only

3.8L Engine Control Schematics

Figure 1:

Power, Ground and MIL


Object Number: 333201  Size: FS
Engine Controls Components
Powertrain Control Module Description
Power, Ground and MIL
Fusible Links, IP Fuse Block, and Underhood Electrical Centers
Ignition Switch and Underhood Electrical Center 2
I/P Fuses 7, 9, 10 and 11
Ignition Switch and Underhood Electrical Center 2
I/P Fuses 7, 9, 10 and 11
BCM, Engine Coolant Level Indicator Module, PCM, and Rear Compartment Lid Ajar Indicator Switch
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
G110 V8 VIN G
OBD II Symbol Description Notice
Figure 2:

Power, Ground and MIL


Object Number: 333198  Size: FS
Engine Controls Components
Powertrain Control Module Description
Ignition Control, Knock Sensors
Power, Ground and MIL
OBD II Symbol Description Notice
Fusible Links, IP Fuse Block, and Underhood Electrical Centers
I/P Fuses 7, 9, 10 and 11
Handling ESD Sensitive Parts Notice
I/P Fuses 7, 9, 10 and 11
Power and Ground Cell 50
G110 V6 VIN K
Figure 3:

Ignition Control, Knock Sensors


Object Number: 333196  Size: FS
Engine Controls Components
Powertrain Control Module Description
Fuel Pump Controls
Power, Ground and MIL
OBD II Symbol Description Notice
Ignition Switch and Underhood Electrical Center 2
U/H Center 2: ENG CTRL Fuse
G112 V8 VIN G
Handling ESD Sensitive Parts Notice
Figure 4:

Fuel Pump Controls


Object Number: 333194  Size: FS
Engine Controls Components
Powertrain Control Module Description
Fuel Injectors
Power, Ground and MIL
OBD II Symbol Description Notice
Fusible Links, IP Fuse Block, and Underhood Electrical Centers
Ground for TAC Module
G110 V6 VIN K
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
G305, G310, G320
A/C HVAC Control
A/C HVAC Control
Figure 5:

Fuel Injectors


Object Number: 333207  Size: FS
Engine Controls Components
Powertrain Control Module Description
TP, MAP, ECT, IAT Sensors
Fuel Pump Controls
OBD II Symbol Description Notice
Ignition Switch and Underhood Electrical Center 2
Handling ESD Sensitive Parts Notice
Figure 6:

TP, MAP, ECT, IAT Sensors


Object Number: 333178  Size: FS
Engine Controls Components
Powertrain Control Module Description
HO2S Sensors
Fuel Injectors
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
MAF Sensor, EVAP System, EGR Valve
Handling ESD Sensitive Parts Notice
Figure 7:

HO2S Sensors


Object Number: 333175  Size: FS
Engine Controls Components
Powertrain Control Module Description
MAF Sensor, EVAP System, EGR Valve
TP, MAP, ECT, IAT Sensors
OBD II Symbol Description Notice
Ignition Switch and Underhood Electrical Center 2
U/H Center 2: ENG SEN Fuse
Handling ESD Sensitive Parts Notice
G112 V8 VIN G
Figure 8:

MAF Sensor, EVAP System, EGR Valve


Object Number: 333171  Size: FS
Engine Controls Components
Powertrain Control Module Description
Gen Control, IAC , Check Gauges Lamp
HO2S Sensors
OBD II Symbol Description Notice
Ignition Switch and Underhood Electrical Center 2
U/H Center 2: ENG SEN Fuse
U/H Center 2: ENG CTRL Fuse
Ignition Switch and Underhood Electrical Center 2
Handling ESD Sensitive Parts Notice
TP, MAP, ECT, IAT Sensors
G110 V6 VIN K
Figure 9:

Gen Control, IAC , Check Gauges Lamp


Object Number: 333166  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cruise Control Switch and Power for TAC Module
MAF Sensor, EVAP System, EGR Valve
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
G110 V6 VIN K
Figure 10:

Cruise Control Switch and Power for TAC Module


Object Number: 333186  Size: FS
Engine Controls Components
Powertrain Control Module Description
Ground for TAC Module
Gen Control, IAC , Check Gauges Lamp
Handling ESD Sensitive Parts Notice
U/H Center 2: ETC and A/C Cruise Fuses
U/H Center 2: ETC and A/C Cruise Fuses
Battery and Underhood Electrical Center 1
Chevrolet: Without Daytime Running Lights Cell 100
Cell 34: PCM
Handling ESD Sensitive Parts Notice
Figure 11:

Ground for TAC Module


Object Number: 333182  Size: FS
Engine Controls Components
Powertrain Control Module Description
2nd Gear, Clutch Anticipate Switch
Cruise Control Switch and Power for TAC Module
Fuel Pump Controls
G110 V6 VIN K
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Figure 12:

2nd Gear, Clutch Anticipate Switch


Object Number: 333158  Size: FS
Engine Controls Components
Powertrain Control Module Description
Brake Switch, TCC Solenoid
Ground for TAC Module
OBD II Symbol Description Notice
G110 V6 VIN K
Ignition Switch and IP Fuse Block
I/P Fuses 1, 2, 5 and 6
Instrument Panel Lamps
Handling ESD Sensitive Parts Notice
Figure 13:

Brake Switch, TCC Solenoid


Object Number: 333156  Size: FS
Engine Controls Components
Powertrain Control Module Description
Trans Range
2nd Gear, Clutch Anticipate Switch
OBD II Symbol Description Notice
Ignition Switch and Underhood Electrical Center 2
U/H Center 2: ENG SEN Fuse
Ignition Switch and Underhood Electrical Center 2
U/H Center 2: ENG CTRL Fuse
Handling ESD Sensitive Parts Notice
Figure 14:

Trans Range


Object Number: 333151  Size: FS
Engine Controls Components
Powertrain Control Module Description
A/C HVAC Control
Brake Switch, TCC Solenoid
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
DRL Module, Park Brake Switch, and Park/Neutral Position Switch
Cell 138
A/C HVAC Control
G110 V6 VIN K
Handling ESD Sensitive Parts Notice
Figure 15:

A/C HVAC Control


Object Number: 333139  Size: FS
Engine Controls Components
Powertrain Control Module Description
OBD II Symbol Description Notice
Ignition Switch and Underhood Electrical Center 2
U/H Center 2: ETC and A/C Cruise Fuses
I/P Fuses 1, 2, 5 and 6
G112 V6 VIN K
Fuel Pump Controls
Fuel Pump Controls
Trans Range
Handling ESD Sensitive Parts Notice
Figure 16:

Cooling Fans


Object Number: 333126  Size: FS
Engine Controls Components
Powertrain Control Module Description
A/C HVAC Control
OBD II Symbol Description Notice
Battery and Underhood Electrical Center 1
Battery and Underhood Electrical Center 1
U/H Center 1: Cool Fan, TCS BAT, ABS BAT SOL, RH HDLP Door, LH HDLP Door and Horn Fuses
Handling ESD Sensitive Parts Notice
G106