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

Engine Controls Sensors


Object Number: 658196  Size: LF
(1)Fuel Pressure Regulator
(2)Engine Coolant Temperature (ECT) Sensor
(3)Engine Control Module (ECM)
(4)Underhood Fuse and Relay Center
(5)Camshaft Position (CMP) Sensor
(6)EVAP Canister Purge Valve
Figure 2:

Engine Compartment


Object Number: 658319  Size: LF
(1)Intake Plenum Switch-Over Solenoid Valve
(2)Intake Plenum Switch-Over Valve
(3)Throttle Position (TP) Sensor
(4)Intake Resonance Switch-Over Valve
(5)Intake Resonance Switch-Over Solenoid Valve
(6)Mass Air Flow (MAF) Sensor with Intake Air Temperature (IAT) Sensor
(7)Knock Sensor (KS) Bank 1
Figure 3:

Top LH Side of Engine


Object Number: 658763  Size: LF
(1)Intaker Plenum Switch-Over Solenoid Valve
(2)Knock Sensor (KS) Bank 2 Connector
(3)Camshaft Position (CMP) Sensor Connector
Figure 4:

Top of Engine


Object Number: 657867  Size: LF
(1)Fuel Rail
(2)Fuel Injector (Cylinder #1)
(3)Fuel Injector (Cylinder #3)
(4)Fuel Injector (Cylinder #5)
(5)Fuel Pressure Service Port
(6)Main Fuel Injector Connector
(7)Fuel Pressure Regulator -- Atmospheric Vent Port
(8)Fuel Pressure Regulator
(9)Fuel Injector (Cylinder #6)
(10)Fuel Injector (Cylinder #4)
(11)Fuel Injector (Cylinder #2)
Figure 5:

Engine Compartment Relay Center


Object Number: 409294  Size: LF
(1)Additional Harness
(2)Fuse #40 (30A)
(3)Fuse #52 (30A)
(4)ECM Ground
(5)Connector C110
(6)Coolant Fan Test Connector
(7)ECM Module
(8)ECM Connector C1
(9)A Fuse #42 (40A) B Fuse #49 (50A)
(10)Fan Control Relay (Orange)
(11)Fuel Pump Relay (Violet)
(12)P108
(13)Additional Harness to Battery
(14)Instrument Panel Wiring Harness
(15)P104
(16)I/P Harness
(17)Fuse #43
(18)Engine Controls Power Relay (Violet)
(19)Fan Control Relay (Brown)
(20)Fuse #50 (For Fan Control & W/W Motor Relays)
(21)Fan Control Relay (Gray)
(22)Fan Control Relay (Green)
(23)A/C Compressor Relay (Green)
(24)Windshield Wiper Motor Relay (Yellow)
(25)Auxiliary Water Pump Relay (White)
(26)Fan Control Relay (Blue)
(27)Secondary Air Injection Pump Relay (Brown)
Figure 6:

HO2S Sensors View


Object Number: 658677  Size: LF
(1)HO2S Bank 1 Sensor 2
(2)Three-way Catalyst Bank 1
(3)HO2S Bank 1 Sensor 1
(4)HO2S Bank 2 Sensor 1
(5)Three-way Catalyst Bank 2
(6)HO2S Bank 2 Sensor 2