GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2008 🢒 Lucerne 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Powertrain Component Views
Figure 1:

EVAP Purge Solenoid and EGR Valve (LD8/L37)
Object Number: 1978241 Size: MF
(1)Evaporative Emission (EVAP) Canister Purge Solenoid Valve
(2)Exhaust Gas Recirculation (EGR) Valve
Figure 2:

HO2S Sensor 2 (Post HO2)
Object Number: 1978244 Size: SF
(1)Heated Oxygen Sensor (HO2S) 2
Figure 3:

Secondary Air Injection (AIR) Pump (LD8/L37 with NU6)
Object Number: 833366 Size: LF
(1)Secondary Air Injection (AIR) Pump
Figure 4:

Internal Electronic Component Locations 4T65E
Object Number: 1978370 Size: LF
(1)Pressure Control (PC) Solenoid Valve Assembly
(2)1-2, 3-4 Shift Solenoid (SS) Valve Assembly
(3)Automatic Transmission Input Shaft Speed (A/T ISS) Sensor Assembly
(4)2-3 Shift Solenoid (SS) Valve Assembly
(5)Lever Assembly-Manual Shaft Detent with Shift Position Switch - Internal Mode Switch (IMS)
(6)Vehicle Speed Sensor (VSS) Assembly
(7)Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly
(8)Transmission Fluid Temperature (TFT) Sensor
(9)Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve Assembly
Figure 5:

Rear of Engine Compartment, on the Top Rear of the Engine
Object Number: 893836 Size: MF
(1)Secondary Air Injection (AIR) Check Valve (NU6)
Figure 6:

Left Front Corner of the Engine Compartment
Object Number: 893598 Size: MF
(1)Mass Air Flow (MAF) / Intake Air Temperature (IAT) Sensor
(2)Engine Control Module (ECM) (LD8/L37), Powertrain Control Module (PCM) (L26), in the Air Cleaner Assembly
Figure 7:

Front of the Engine (L26)
Object Number: 1978372 Size: LF
(1)Ignition Coil Module
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Fuel Injector 1
(4)Fuel Injector 3
(5)Fuel Injector 5
(6)Exhaust Gas Recirculation (EGR) Valve
(7)Throttle Actuator Control (TAC) Module
(8)Engine Coolant Temperature (ECT) Sensor
(9)Starter Solenoid
(10)Starter
(11)Engine Oil Level Switch
(12)G110
(13)Knock Sensor (KS) 1
Figure 8:

Rear of the Engine (L26)
Object Number: 1552088 Size: LF
(1)Evaporative Emission (EVAP) Canister Purge Solenoid Valve
(2)Throttle Actuator Control (TAC) Module
(3)Exhaust Gas Recirculation (EGR) Valve
(4)Fuel Injector 6
(5)Fuel Injector 4
(6)Fuel Injector 2
(7)Manifold Absolute Pressure (MAP) Sensor
(8)Camshaft Position (CMP) Sensor
(9)Engine Oil Pressure (EOP) Sensor
(10)Knock Sensor (KS) 2
(11)Heated Oxygen Sensor (HO2S) 1
Figure 9:

Electronic Component Views 4T80E
Object Number: 1978248 Size: LF
(1)Torque Converter Clutch Pulse Width Modulated (TCC PWM) Solenoid Valve
(2)Pressure Control Solenoid (PCS) Valve
(3)Automatic Transmission Input (Shaft) Speed Sensor (ISS)
(4)Vehicle Speed Sensor (VSS)
(5)1-2 and 2-3 Shift Solenoid (1-2 SS) (2-3 SS) Valves
(6)Internal Mode Switch (IMS)
(7)Automatic Transmission Fluid Temperature (TFT) Sensor
Figure 10:

Top of the Engine (L37/LD8)
Object Number: 1657280 Size: LF
(1)Starter Motor
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Throttle Body Assembly
(4)Fuel Injector 8
(5)Ignition Coil/Module 8
(6)Fuel Injector 6
(7)Ignition Coil/Module 6
(8)Knock Sensor (KS) 2
(9)Fuel Injector 4
(10)Ignition Coil/Module 4
(11)Ignition Coil/Module 2
(12)Fuel Injector 2
(13)Crankshaft Position (CKP) Sensor
(14)Knock Sensor (KS) 1
(15)Camshaft Position (CMP) Sensor
(16)Ignition Coil/Module 1
(17)Ignition Coil/Module 3
(18)Fuel Injector 1
(19)Ignition Coil/Module 5
(20)Fuel Injector 3
(21)Ignition Coil/Module 7
(22)Fuel Injector 5
(23)Fuel Injector 7
Figure 11:

Front of the Engine (L37/LD8)
Object Number: 1657286 Size: LF
(1)Valve Cover
(2)Ignition Coil/Module 2
(3)Ignition Coil/Module 4
(4)Ignition Coil/Module 6
(5)Ignition Coil/Module 8
(6)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
(7)Engine Oil Pressure (EOP) Switch
Figure 12:

Rear of the Engine (L37/LD8)
Object Number: 1657287 Size: LF
(1)Throttle Body Assembly
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Valve Cover
(4)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
(5)Engine Coolant Temperature (ECT) Sensor
(6)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2
Figure 13:

Left Side of Engine (LD8/L37)
Object Number: 1978253 Size: LF
(1)Engine - 4.6L
(2)A/C Compressor Clutch
(3)Generator
(4)G110
Figure 14:

G112, G114, and G115 (LD8/L37)
Object Number: 1707088 Size: LF
(1)Exhaust Manifold
(2)G114
(3)G112
(4)G115
Figure 15:

Above the Transmission (L26)
Object Number: 1978373 Size: LF
(1)Evaporative Emission (EVAP) Canister Purge Solenoid Valve
(2)Intake Manifold
(3)Vehicle Speed Sensor (VSS)
(4)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
(5)G114
(6)Transmission
Figure 16:

Near the Rear Cylinder Head (LD8/L37)
Object Number: 1707093 Size: LF
(1)Exhaust Gas Recirculation (EGR) Valve
(2)Valve Cover
(3)G100
(4)Engine Coolant Temperature (ECT) Sensor
Figure 17:

Front of the Engine (L26)
Object Number: 1707098 Size: LF
(1)Generator
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Throttle Actuator Control (TAC) Module
(4)Engine Coolant Heater
(5)Starter
(6)Knock Sensor (KS) 1
(7)Engine Oil Level Switch
(8)A/C Compressor Clutch
(9)Ignition Control Module (ICM)
Figure 18:

Right Side of Engine-Engine Front (L26)
Object Number: 1552090 Size: LF
(1)Exhaust Gas Recirculation (EGR) Valve
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Throttle Actuator Control (TAC) Module
(4)Ignition Coil / Module
(5)Crankshaft Position (CKP) Sensor
(6)Engine Oil Pressure (EOP) Sensor
(7)Camshaft Position (CMP) Sensor
(8)Heated Oxygen Sensor (HO2S) 1
Figure 19:

G115 (L26)
Object Number: 1551331 Size: LF
(1)Intake Manifold
(2)Ignition Control Module
(3)G115
(4)Harmonic Balancer