GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Controls - 6.6L (LLY) 🢒 Engine Controls Component Views
Figure 1:

LF of the Engine Compartment
Object Number: 1372694 Size: LF
(1)Battery Tray - Left
(2)Engine Control Module (ECM)
(3)Transmission Control Module (TCM)
(4)Fan Shroud
Figure 2:

Right Side of the Engine
Object Number: 1372695 Size: LF
(1)Fuel Injector 7
(2)Glow Plug 7
(3)Fuel Injector 5
(4)Glow Plug 5
(5)Fuel Injector 3
(6)Glow Plug 3
(7)Fuel Injector 1
(8)Glow Plug 1
(9)Camshaft Position (CMP) Sensor
(10)Crankshaft Position (CKP) Sensor
(11)Starter
(12)Starter Solenoid
Figure 3:

Left Side of the Engine
Object Number: 1372696 Size: LF
(1)Glow Plug 2
(2)Fuel Injector 2
(3)Fuel Injector 4
(4)Glow Plug 4
(5)Fuel Injector 6
(6)Glow Plug 6
(7)Fuel Injector 8
(8)Glow Plug 8
(9)Engine Oil Pressure (EOP) Sensor
(10)Engine Oil Level Switch
Figure 4:

Top of the Engine
Object Number: 1372697 Size: LF
(1)Fuel Heater
(2)Fuel Filter
(3)Water In Fuel (WIF) Sensor
(4)Fuel Pressure Sensor
(5)Fuel Temperature Sensor
(6)Glow Plug Controller
(7)Baro Sensor
(8)Boost Pressure Sensor
(9)Fuel Pressure Regulator
(10)Fuel Injection Control Module (FICM)
(11)Exhaust Gas Recirculation (EGR) Valve
Figure 5:

Upper Front of the Engine
Object Number: 1372700 Size: LF
(1)Engine Coolant Temperature (ECT) Sensor
Figure 6:

Turbo Assembly
Object Number: 1372698 Size: LF
(1)Turbocharger Vane Position Control Solenoid Valve
(2)Turbocharger Vane Position Sensor
Figure 7:

Fuel Tank - Primary
Object Number: 1453751 Size: LF
(1)Fuel Pump and Sender Assembly - Primary Connector (Gas)/Fuel Level Sensor - Primary Connector (Diesel)
(2)Fuel Pump and Sender Assembly - Primary (Gas)/Fuel Level Sensor - Primary (Diesel)
Figure 8:

Fuel Tank - Secondary
Object Number: 1372699 Size: LF
(1)Fuel Pump and Sender Assembly - Secondary (Gas)/Fuel Level Sensor - Secondary (Diesel)
(2)Fuel Pump (Diesel Only)
Figure 9:

Right Side of Engine Compartment
Object Number: 1453755 Size: MF
(1)Auxiliary Battery Relay w/TP2
(2)A/C Accumulator
(3)A/C Low Pressure Switch
(4)Inner Wheel Well
(5)Coolant Level Switch Connector 6.6L and 8.1L
(6)Mass Air Flow (MAF) Sensor
(7)Air Cleaner Assembly
(8)Engine Coolant Recovery Reservoir
(9)Auxiliary Battery Relay Electrical Connector w/TP2
Figure 10:

Accelerator Pedal Position (APP) Sensor
Object Number: 776382 Size: MF
(1)Accelerator Pedal Position (APP) Sensor
(2)Accelerator Pedal Position (APP) Connector