Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Powertrain Management: Locations
Engine Controls Component Views
Secondary Air Injection (AIR) Components
1 - Secondary Air Injection (AIR) Solenoid
2 - Secondary Air Injection (AIR) Pump Relay
3 - Secondary Air Injection (AIR) Pump
Engine Controls Components
1 - Powertrain Control Module C1 (Body Harness)
2 - Powertrain Control Module
3 - Heated Oxygen Sensor (HO2S) 2
4 - Fuse Block - Underhood
5 - Engine Harness
6 - Heated Oxygen Sensor (HO2S) 1
7 - Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor
8 - Powertrain Control Module C3 (Engine Harness)
9 - Powertrain Control Module C2 (Engine Harness)
Engine Components - Right Side (L52)
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 - Bank 1 Exhaust
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 - C101 Fuel Injector Harness to Engine Harness
12 - Ignition Coil 5
13 - Ignition Coil 4
Engine Components - Left Side (L52)
1 - Evaporative Emission (EVAP) Canister Purge Solenoid Valve
2 - Starter Solenoid
3 - Knock Sensor (KS) Bank 2
4 - Crankshaft Position (CKP) Sensor
5 - G102
6 - G103
7 - Engine Block Heater
8 - Camshaft Position (CMP) Sensor - Intake
9 - Camshaft Position (CMP) Sensor - Exhaust
Fuel Injectors
1 - Fuel Injector 1
2 - Fuel Injector 2
3 - Fuel Injector 3
4 - Fuel Injector 4
5 - C101 Fuel Injector Harness to Engine Harness
6 - Fuel Injector 5
Lower Left Side of I/P
Lower Left Side of I/P:
1 - Clutch Start Switch (MA5)
2 - Accelerator Pedal Position (APP) Sensor
3 - Steering Wheel Position Sensor (JL4)
4 - TCC Brake/Cruise Release Switch
5 - Stop Lamp Switch
6 - Park Brake Switch
7 - Clutch Release Switch (MA5)
Left Middle Side of Frame Rail
1 - Fuel Tank Pressure (FTP) Sensor Connector
2 - Fuel Pump and Sender Assembly
3 - Evaporative Emission (EVAP) Canister Vent Solenoid Valve
4 - Chassis Harness
5 - Fuel Tank
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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