2008 Hummer H3 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Powertrain Component Views

Fig 1: Left Front of the Engine Components (LLR)
GM1563749Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Evaporative Emission (EVAP) Canister Purge Soleniod Valve
2 Starter Motor
3 Knock Sensor (KS)
4 Crankshaft Position (CKP) Sensor
5 G102
6 G103
7 Engine Block Heater (K05)
8 Camshaft Position (CMP) Sensor
9 Camshaft Position (CMP) Actuator Solenoid Valve
Fig 2: Right Rear of the Engine Components (LLR)
GM1563748Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Manifold Absolute Pressure (MAP) Sensor
2 Throttle Body
3 Ignition Coil 3
4 Ignition Coil 2
5 Ignition Coil 1
6 Camshaft Position (CMP) Actuator Solenoid Valve
7 Engine Oil Pressure (EOP) Switch
8 Heated Oxygen Sensor (HO2S) 1
9 Engine Coolant Temperature (ECT) Sensor
10 Engine Coolant Temperature (ECT) Sensor Connector
11 X101
12 Ignition Coil 5
13 Ignition Coil 4
Fig 3: Identifying Fuel Injectors (LLR)
GM1640612Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Fuel Injector 1
2 Fuel Injector 2
3 Fuel Injector 3
4 Fuel Injector 4
5 X101
6 Fuel Injector 5
Fig 4: Identifying Secondary Air Injection (AIR) Components
GM1850289Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Secondary Air Injection (AIR) Pump Solenoid
2 Secondary Air Injection (AIR) Pump Relay
3 Secondary Air Injection (AIR) Pump
Fig 5: Engine - Front (LH8)
GM2002132Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Throttle Body
2 Camshaft Position (CMP) Sensor
Fig 6: Engine - Left (LH8)
GM2002140Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Engine Coolant Temperature (ECT) Sensor
2 Generator
3 Ignition Coil 1
4 Evaporative Emission (EVAP) Canister Purge Solenoid Valve
5 Ignition Coil 3
6 Ignition Coil 5
7 Ignition Coil 7
8 Engine Oil Pressure (EOP) Sensor
9 Park/Neutral Position (PNP) Switch (M30)
10 Knock Sensor (KS) 1
11 Engine Block Heater Connector (K05)
Fig 7: Engine - Left Side (LH8)
GM2002113Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Crankshaft Position (CKP) Sensor
2 Ignition Coil 8
3 Ignition Coil 6
4 Ignition Coil 4
5 Manifold Absolute Pressure (MAP) Sensor
6 Ignition Coil 2
7 A/C Compressor Clutch
8 Knock Sensor (KS) 2
9 Starter Motor
Fig 8: Engine - Top View (LH8)
GM2002118Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Fuel Injector 1
2 Fuel Injector 4
3 Fuel Injector 6
4 Fuel Injector 8
5 Fuel Injector 7
6 Fuel Injector 5
7 Fuel Injector 3
8 Fuel Injector 1
Fig 9: Park Neutral Position (PNP) Switch Component Views (M30/M32)
GM1283232Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Automatic Transmission
2 Park/Neutral Position (PNP) Switch
Fig 10: Inside the Transmission Components (M30)
GM1972965Courtesy of GENERAL MOTORS CORP.
Callout Component Name
36 Vehicle Speed Sensor (VSS)
66 Torque Converter Clutch (TCC) Solenoid Valve
69 Automatic Transmission Fluid Pressure Manual Valve Position Switch
367a 1-2 Shift Solenoid (SS) Valve
367b 2-3 Shift Solenoid (SS) Valve
377 Pressure Control (PC) Solenoid Valve
394 3-2 Shift Solenoid (SS) Valve
396 Torque Converter Clutch (TCC) Pulse Width Modulation (PWM) Solenoid Valve
Fig 11: Identifying Engine Harness - Rear (M30)
GM1550416Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Transmission
2 X175
3 Heated Oxygen Sensor (HO2S) 2 Connector (LLR)
4 Transfer Case Encoder Motor Connector
5 Vehicle Speed Sensor (VSS) Connector
6 Park/Neutral Position (PNP) Switch
Fig 12: Identifying Rear Engine Harness (MA5)
GM1550417Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Transmission
2 Backup Lamp Switch
3 Heated Oxygen Sensor (HO2S) 2 Connector (LLR)
4 Transfer Case Encoder Motor Connector
5 Vehicle Speed Sensor (VSS) Connector
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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