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

Automatic Transmission - Allison® LCT


Object Number: 1963504  Size: LF
(1)Automatic Transmission Input Shaft Speed (AT ISS) Sensor
(2)Automatic Transmission Input Shaft Speed (AT ISS) Sensor Connector
(3)Turbine Shaft Speed Sensor (TSS)
(4)Turbine Shaft Speed Sensor (TSS) Connector
(5)Vehicle Speed Sensor (VSS)
(6)Vehicle Speed Sensor (VSS) Connector
(7)Automatic Transmission (Allison® LCT)
(8) Transmission Shift Selector
Figure 2:

Under the Throttle Body (LLY)


Object Number: 1957507  Size: LF
(1)Engine Coolant Temperature (ECT) Sensor
Figure 3:

Front of Engine (L18)


Object Number: 1964877  Size: LF
(1)Generator
(2)Generator Assembly
(3)Engine Harness
(4)Generator Ring Terminal
Figure 4:

Front of Engine (LF8)


Object Number: 1965048  Size: LF
(1)Exhaust Gas Recirculation (EGR) Cooler Temperature Sensor 1
(2)Throttle Body
(3)X129
(4)Exhaust Gas Recirculation (EGR) Cooler Temperature Sensor 2
(5)Engine Coolant Temperature (ECT) Sensor
Figure 5:

Front of Engine (LB7/LLY)


Object Number: 1965288  Size: LF
(1)Generator Ring Terminal
(2)Generator Connector
(3)Generator
(4)Generator Connector
(5)Generator
(6)Engine Harness
(7)Generator Ring Terminal
Figure 6:

Manual Transmission


Object Number: 1963512  Size: LF
(1)Rear Axle Driver Control Switch - Two Speed (HPZ) or Two Speed Rear Axle Control Valve (HR2/Manual Transmission)
(2)Backup Lamp Switch
(3)Vehicle Speed Sensor (VSS)
Figure 7:

Lower Back of Engine


Object Number: 1963813  Size: LF
(1)Knock Sensor (KS) Bank 2
(2)Engine Oil Level Switch
(3)Starter Solenoid
(4)Engine Chassis Harness
Figure 8:

G119 (LMM)


Object Number: 1964755  Size: LF
(1)Exhaust Manifold
(2)G119
Figure 9:

G120 (LMM)


Object Number: 1964758  Size: LF
(1)Crankshaft Pulley
(2)G120
Figure 10:

Top of Engine


Object Number: 1964760  Size: LF
(1)Engine Chassis Harness
(2)X110 (8 cavities - L18)
(3)Engine Coolant Temperature (ECT) Sensor (L18)
(4)Engine Coolant Temperature (ECT) Sensor Connector
(5)X110 (8 cavities - L18)
Figure 11:

Rear of Engine Block


Object Number: 1964766  Size: LF
(1)Engine Oil Pressure (EOP) Switch
(2)Engine Harness
(3)Engine Oil Pressure (EOP) Switch Connector
(4)Crankshaft Position (CKP) Sensor Connector
(5)G115
(6)Heated Oxygen Sensor (HO2S) - Left Side
(7)Crankshaft Position (CKP) Sensor
Figure 12:

Front Left of Engine


Object Number: 1964875  Size: LF
(1)Camshaft Position (CMP) Sensor
(2)Knock Sensor 1(KS1)
(3)Knock Sensor Connector
(4)Engine Harness
(5)Camshaft Position (CMP) Sensor Connector
Figure 13:

Engine View - Upper Right


Object Number: 1964879  Size: LF
(1)Engine Harness
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Manifold Absolute Pressure (MAP) Sensor Connector
(4)Engine
(5)Ignition Coil Connector (Engine Side)
(6)Throttle Actuator Control (TAC) Motor
(7)Ignition Coil Connector (Harness Side)
(8)Engine Coolant Temperature (ECT) Sensor Connector
(9)Ignition Coil
Figure 14:

Front of the Engine Compartment


Object Number: 1964881  Size: LF
(1)A/C Compressor Clutch (C60)
(2)Throttle Position (TP) Sensor (part of the Throttle Body)
(3)Evaporative Emission (EVAP) Canister Purge Solenoid Valve
(4)Throttle Actuator (part of the Throttle Body)
(5)A/C High Pressure Switch (C60)
Figure 15:

Top of Engine


Object Number: 1964885  Size: LF
(1)Engine Harness
(2)X111
(3)X111
(4)Fuel Rail Pressure Regulator
Figure 16:

Rear of Engine Block


Object Number: 1964887  Size: LF
(1)Engine Oil Pressure (EOP) Switch
(2)Engine Chassis Harness
(3)Engine Oil Pressure (EOP) Switch Connector
(4)Crankshaft Position (CKP) Sensor Connector
(5)G115
(6)Heated Oxygen Sensor (HO2S) Bank 1
(7)Crankshaft Position (CKP) Sensor
Figure 17:

Right Side of Engine (LF8)


Object Number: 1965053  Size: LF
(1)Turbocharger Vane Position Connector
(2)Turbocharger Vane Position Control Solenoid Valve
(3)Turbocharger
(4)Engine Oil Pressure (EOP) Sensor
(5)Turbocharger Vane Position Sensor
(6)Flywheel Sensor
(7)Camshaft Position (CMP) Sensor
Figure 18:

Left Side of Engine (LF8)


Object Number: 1965055  Size: LF
(1)X122
(2)Manifold Absolute Pressure (MAP) Sensor
(3)X123
(4)Engine Control Module (ECM) X2
(5)Intake Manifold Temperature (IMT) Sensor
(6)Fuel Temperature Sensor
(7)Suction Control Valve (SCV)
(8)Crankshaft Position (CKP) Sensor
(9)G100
(10)Oil Level Switch
(11)X111
(12)Fuel Rail Pressure (FRP) Sensor
(13)Water in Fuel Sensor
(14)Glow Plug Control Module
(15)Exhaust Gas Recirculation (EGR) Valve
Figure 19:

Left Rear Engine View


Object Number: 1965058  Size: LF
(1)Fuel Injector Connector X123 - to the fuel injector harness connector adapter 2
(2)Glow Plug 5
(3)Fuel Temperature Sensor
(4)Glow Plug 6
Figure 20:

Top of Engine, Front, Under Valve Cover


Object Number: 1965063  Size: LF
(1)Fuel Injector 1
(2)Fuel Injector 2
(3)X122 (8 cavities)
(4)Fuel Injector 3
(5)Glow Plug 3
(6)Glow Plug Bus 2
(7)Fuel Injector Harness Connector Adapter 1 (X122)
(8)Glow Plug 2
(9)Glow Plug Bus 1
(10)Glow Plug 1
Figure 21:

Top of Engine, Rear, Under Valve Cover


Object Number: 1965067  Size: LF
(1)Fuel Injector 4
(2)X123 (8 cavities)
(3)Fuel Injector 5
(4)Fuel Injector 6
(5)Glow Plug 6
(6)Glow Plug Bus 2
(7)Glow Plug 5
(8)Fuel Injector Harness Connector Adapter 2 (X123)
(9)Glow Plug 4
(10)Glow Plug Bus 1
Figure 22:

Top Left Side of Engine, Intake


Object Number: 1965075  Size: MF
(1)Boost Pressure Sensor
(2)Intake Manifold
Figure 23:

Top Center of Flywheel Housing


Object Number: 1965081  Size: MF
(1)Crankshaft Position (CKP) Sensor (Allison® LCT)
Figure 24:

Left Side of the Engine


Object Number: 1965259  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 25:

Right Side of the Engine


Object Number: 1965266  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 26:

Top of the Engine


Object Number: 1965270  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