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.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 143 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)COMPONENT LOCATIONS3.4L (VIN E) "U" SERIES
2003 Chevrolet TrailBlazer 4.2 S, 4WD
3.4L (VIN E) "U" Series
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION 3.4L (VIN E) "U" Series
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
COMPONENT LOCATIONS 3.4L (VIN E) "U" SERIES
| Component | Location |
|---|---|
| A/C Refrigerant Pressure Sensor | Left Side Of Engine Compartment, Below Accumulator, Below Air Cleaner Assembly |
| Body Control Module | Below Right Side Of Instrument Panel, Right Of Glove Box |
| Camshaft Position Sensor | Right Side Of Engine, Above A/C Compressor Clutch |
| Crankshaft Position Sensor (7x) | Lower Rear Of Engine |
| Crankshaft Position Sensor (24x) | Right Side Of Engine, Behind Harmonic Balancer |
| Cruise Control Module | In Engine Compartment, Near Left Strut Tower |
| Data Link Connector | Below Steering Column, Bottom Of Knee Bolster |
| Engine Coolant Temperature Sensor | Top Left Side Of Engine |
| Engine Oil Level Indicator Switch | Center Of Engine Oil Pan |
| Engine Oil Pressure Indicator Switch | Front Of Engine, Above Starter |
| EVAP Canister Purge Solenoid | Top Of Engine, Above Starter |
| EVAP Canister Vent Solenoid | Below Center Of Vehicle, Forward Of Fuel Tank |
| Exhaust Gas Recirculation Valve | Upper Left Side Of Engine |
| Fuel Injectors | Top Of Engine At Each Cylinder Intake Port |
| Fuel Pump Relay | In Underhood Junction Block |
| Fuel Tank Pressure Sensor | Left Side Of Vehicle, Top Of Fuel Tank |
| Heated Oxygen Sensor (HO2S 1) | Rear Of Engine, In Exhaust Manifold |
| Heated Oxygen Sensor (HO2S 2) | In Exhaust System, Behind Catalytic Converter |
| Idle Air Control Valve | Top Of Engine, Front Of Throttle Body |
| Ignition Control Module | Top Center Rear Of Engine |
| Intake Air Temperature Sensor | Left Side Of Engine Compartment, On Air Intake Duct, Near Throttle Body |
| Knock Sensor | Front Of Engine, Above Starter |
| Manifold Absolute Pressure Sensor | Right Top Of Engine |
| Mass Airflow Sensor | Left Front Of Engine Compartment, In Air Cleaner Duct |
| Powertrain Control Module | In Engine Compartment, Secured In Air Cleaner Assembly |
| Secondary AIR Injection Pump | Mounted In Lower Portion Of Drivers Side Front Fender |
| Secondary AIR Injection Solenoid | Forward Lamp Harness, Right Side Of Engine Compartment, Behind Horn |
| Throttle Position Sensor | Top Of Engine, On Throttle Assembly |
| Underhood Fuse Block | In Engine Compartment, Front Of Right Wheelwell, Above Battery |
| Vehicle Speed Sensor | Lower Right Rear Of Engine Compartment, Mounted To Right Side Of Transaxle |
RENDER: 1.0x
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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.