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

Front of Vehicle


Object Number: 826867  Size: LF
(1)Chassis Harness
(2)Vacuum Pump
(3)Coolant Level Switch Connector
(4)Engine Fan Harness
(5)Vacuum Pump Connector
(6)C106
(7)C106
Figure 2:

Right Side of the Engine


Object Number: 1809265  Size: LF
(1)Fuel Injector 7
(2)Fuel Injector 5
(3)Fuel Injector 3
(4)Fuel Rail Pressure (FRP) Sensor
(5)Fuel Injector 1
(6)Exhaust Gas Recirculation (EGR) Valve
(7)Manifold Absolute Pressure (MAP) Sensor
(8)Intake Air (IA) Heater
(9)Glow Plug Controller
(10)Crankshaft Position (CKP) Sensor
(11)Glow Plug 1
(12)Block Heater
(13)Glow Plug 3
(14)Starter
(15)Glow Plug 5
(16)Glow Plug 7
Figure 3:

Left Side of the Engine


Object Number: 1809262  Size: LF
(1)Intake Air Temperature (IAT) Sensor
(2)Turbocharger Vane Position (TVP) Sensor
(3)Fuel Injector 8
(4)Glow Plug 8
(5)Fuel Injector 6
(6)Glow Plug 6
(7)Engine Oil Pressure (EOP) Sensor
(8)Water-In-Fuel Sensor
(9)Glow Plug 4
(10)Fuel Injector 4
(11)Engine Oil Level Switch
(12)Glow Plug 2
(13)Fuel Injector 2
(14)Turbocharger Vane Position (TVP) Sensor Connector
(15)Barometric Pressure (BARO) Sensor
Figure 4:

Top of the Engine


Object Number: 1809267  Size: LF
(1)Exhaust Gas Recirculation (EGR) Valve
(2)Fuel Pump
(3)Intake Air Temperature (IAT) Sensor
(4)Turbocharger Vane Position (TVP) Control Solenoid Valve
(5)Fuel Temperature Sensor
(6)Camshaft Position (CMP) Sensor
(7)Glow Plug Controller
Figure 5:

Air Cleaner Assembly


Object Number: 822049  Size: LF
(1)Engine Chassis Harness
(2)Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor
Figure 6:

ECM/TCM View


Object Number: 1422659  Size: LF
(1)Engine Control Module (ECM)
(2)Transmission Control Module (TCM)
Figure 7:

Accelerator Pedal


Object Number: 1155067  Size: LF
(1)Accelerator Pedal Position (APP) Sensor Connector
(2)Accelerator Pedal Position (APP) Sensor
(3)Accelerator Pedal
(4)C201 (48 cavities)
Figure 8:

Instrument Panel


Object Number: 1699704  Size: LF
(1)Trailer Park Brake Control (JE4)
(2)Park Brake Control (JE4)
(3)Gage Center
(4)Inflatable Restraint I/P Module (AK5)
(5)Auxiliary Power Outlets
(6)Air Brake Pressure Gage (JE4)
(7)Transfer Case Shift Control Switch (NP1)
(8)Traction Control Switch (NW9)
(9)Outside Heated Mirror Switch (DB6/DB8)
(10)Exhaust Brake Switch (K40)
(11)Rear Axle Driver Control Switch - Two Speed (HPZ/Automatic Transmission)
(12)Inflatable Restraint I/P Module Disable Switch (AK5 w/o AQR)
(13)Differential Lock Switch (HNB/HPL/HPN) or Inter-Axle Differential Lock Switch (Tandem Axle)
(14)Switch
(15)Air Suspension Dump Switch (G40/G45/GSJ)
(16)Diesel Particulate Filter (DPF) (Diesel Only)
(17)Marker Lamp Switch (RQ2 and U86 or RQ3)
(18)High Idle Switch (UF3)/Power Take-Off (PTO) Switch
(19)Air Cleaner Restriction Gage (UPM)
(20)Automatic Transmission Fluid Temperature (TFT) Gage (Allison® LCT/UXT)
(21)I/P Switchbank
(22)HVAC Control Assembly (C40/C60)
(23)Driver Information Center (DIC)
(24)Radio (w/o UL5)
(25)Inflatable Restraint Steering Wheel Module (AJ3/AK5)
(26)Headlamp Switch
(27)Turn Signal/Multifunction Switch
(28)Instrument Panel Cluster (IPC)
Figure 9:

Air Compressor (K16), Fuel Tanks and Trailer Connector (RQ2 and U86 or RQ3)


Object Number: 1014827  Size: LF
(1)Splice Pack SP400 (Ground Block)
(2)C409 (8 cavities) Fuel Tank Harness to the Chassis Harness
(3)Fuel Pump (FP) Relay
(4)Fuel Sender - Secondary
(5)Fuel Tank Transfer Pump - Secondary
(6)Trailer Connector (RQ2 and U86 or RQ3)
(7)C410 (3 cavities - K16) Chassis Harness to the Air Compressor Harness
(8)Air Compressor Connector (K16)
(9)Air Compressor Relay (K16)
(10)Air Compressor (K16)
(11)Fuel Sender - Primary