GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century 🢒 Engine 🢒 Engine Electrical 🢒 Engine Controls Component Views
Figure 1:

A/C Compressor -- Lower Right Front of Engine
Object Number: 327373 Size: LF
(1)Crankshaft Position (24X) Sensor
(2)Bank 1 Knock Sensor (KS)
(3)Engine Oil Pressure Indicator Switch
(4)Fusible Links
(5)A/C Compressure Clutch Coil
Figure 2:

Lower Front of Engine
Object Number: 389009 Size: LF
(1)G117 (Engine Compartment Ground)
(2)G111/G113 (Ignition Control Module, Engine Electronic and Battery Grounds)
(3)Starter Assembly
(4)Bank 1 Knock Sensor (KS)
(5)Positive Battery Cable
(6)Fusible Links
(7)Engine Oil Pressure Indicator Switch
Figure 3:

Left Side of Engine
Object Number: 400595 Size: LF
(1)Camshaft Position Sensor
Figure 4:

Rear of Engine
Object Number: 388941 Size: LF
(1)Ignition Control Module C3
(2)Ignition Control Module
(3)Crankshaft Position (CKP) Sensor (7X)
(4)Crankshaft Position (CKP) Sensor Wirirng Harness
Figure 5:

Lower Right Side of Engine
Object Number: 388943 Size: LF
(1)Crankshaft Position (CKP) Sensor (24X)
(2)Front Cover
Figure 6:

EVAP Canister -- LR Wheel Opening
Object Number: 305367 Size: LF
(1)Evaporative Emissions (EVAP) Canister
(2)Evaporative Emissions (EVAP) Canister Vent Solenoid Valve
(3)P425
(4)Body Wiring Harness
Figure 7:

Top Left Side of Engine
Object Number: 374680 Size: LF
(1)Throttle Position Sensor
(2)Idle Air Control (IAC) Valve
(3)Exhaust Gas Recirclation (EGR) Valve
Figure 8:

Fuel Sender System
Object Number: 50636 Size: SH
(1)Quick Connector Fuel Line
(2)Fuel Sender Assembly
(3)Fuel Sender Assembly Base Plate
(4)Fuel Strainer
(5)Fuel Level Sensor
(6)Springs
(7)Vapor Pressure Sensor
Figure 9:

Vehicle Fuel Tank
Object Number: 374824 Size: LF
(1)C405
Figure 10:

Top Center Rear of Engine
Object Number: 374676 Size: LF
(1)Generator Connector
(2)Ignition Control Module (ICM), C2 Connector
(3)Heated Oxygen Sensor 1 (HO2S1)
(4)Ignition Control Module (ICM), C2 Connector
(5)Ignition Control Module (ICM), C1 Connector
Figure 11:

Heated Oxygen Sensor 2 (HO2S2) -- Below Center of Vehicle
Object Number: 305319 Size: LF
(1)Exhaust Heat Shield
(2)Catalytic Converter
(3)Heated Oxygen Sensor 2 (HO2S2)
Figure 12:

Top Front of Engine
Object Number: 374674 Size: LF
(1)Mass Air Flow (MAF) Sensor
Figure 13:

Top Side of Engine (w/RPO LG8)
Object Number: 374679 Size: LF
(1)Manifold Absolute Pressure (MAP) Sensor
Figure 14:

Powertrain Control Module (PCM)-- LH Side of Engine Compartment
Object Number: 305307 Size: LF
(1)Powertrain Control Module (PCM) Connector,C2 (Blue)
(2)Powertrain Control Module (PCM) Connector, C1 (Clear)
(3)Powertrain Control Module (PCM)
(4)Air Cleaner/PCM Housing
(5)Engine Wiring Harness
(6)G101 LH Forward Lamp Ground
Figure 15:

Left Side Of Transmission
Object Number: 327378 Size: LF
(1)Park/Neutral Position Switch
(2)Park/Neutral Position Switch, C1
(3)Park/Neutral Position Switch, C2
(4)Engine Wiring Harness
(5)C111 (Inline to Automatic Tranaxle From Engine Wiring Harness)
Figure 16:

Right Rear of Engine
Object Number: 374682 Size: LF
(1)Vehicle Speed Sensor (VSS)
(2)Vehicle Speed Sensor (VSS) Connector