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 241 (ENGINE CONTROL SYSTEM & ENGINE COMPONENT TESTS - 2.2L)COMPONENT LOCATIONS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Component Locations
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Component Locations
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For component locations, refer to COMPONENT LOCATIONS table or illustrations. See Fig 1-Fig 6
.
COMPONENT LOCATIONS
| Component | Location | |
|---|---|---|
| A/C Compressor Clutch Relay | In Underhood Fuse/Relay Block | |
| A/C Refrigerant Pressure Sensor | On A/C Evaporator Tube | |
| Body Control Module | Lower Rear Of Instrument Panel, On Heater | |
| Camshaft Position Sensor | Right Side Of Engine, Forward Of Coil Packs | |
| Crankshaft Position Sensor | Right Side Of Engine, Below Coil Packs | |
| Cruise Control Module | Left Rear Of Engine Compartment, On Cowl | |
| Data Link Connector | Lower Left Side Of Instrument Panel | |
| Engine Coolant Temperature Sensor | Front Of Engine, In Coolant Piping | |
| Engine Oil Pressure Sensor | Right Side Of Engine, Front Of Coil Pack | |
| EVAP Canister Purge Solenoid | Right Side Of Engine, Above Coil Packs | |
| EVAP Canister Vent Solenoid | Crossmember Area Of Fuel Tank, Rear Center Of Crossmember Behind Fuel Tank | |
| Fuel Filter/ Fuel Pressure Regulator |
Fuel feed pipe, between fuel pump and fuel injectors | |
| Fuel Injectors | On Lower Manifold Assembly | |
| Fuel Pump Relay | In Underhood Fuse/Relay Block | |
| Fuel Tank Pressure Sensor | Top Of Fuel Tank | |
| Heated Oxygen Sensor - Bank 1, Sensor 2 | Rear Of Catalytic Converter | |
| Idle Air Control Valve | On Throttle Body | |
| Ignition Control Module | Right Rear Of Engine, Near Grounding Strap | |
| Intake Air Temperature Sensor | On Air Intake Duct | |
| Knock Sensor | Lower Right Side Of Engine, Below Coil Packs | |
| Manifold Absolute Pressure Sensor | Top Right Side Of Engine, On Intake Manifold | |
| Oxygen Sensor - Bank 1, Sensor 1 | Left Side Of Engine, In Exhaust Manifold Crossover Pipe | |
| Powertrain Control Module | Right Side Of Engine Compartment | |
| Secondary Air Injection Pump | Lower Right Front Of Engine Compartment | |
| Secondary Air Injection Reactor Fuse Block | Mounted to Right Front Fender, Next To Battery | |
| Throttle Position Sensor | On Throttle Body | |
| Underhood Fuse/Relay Block | On Top Of Left Inner Wheelwell | |
| Vehicle Speed Sensor | ||
| A/T | Right Rear Of Transmission | |
| M/T | Left Rear Of Transmission | |
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.