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 245 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - 4.3L)COMPONENT LOCATIONS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Component Locations
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Component Locations
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Sonoma, 2003 GMC Safari, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For component locations refer to COMPONENT LOCATIONS - ASTRO & SAFARI or COMPONENT LOCATIONS - BLAZER, JIMMY CANADIAN, SAFARI & S10 PICKUP
table or illustrations. See Fig 1-Fig 17
.
COMPONENT LOCATIONS - ASTRO & SAFARI
| Component | Location |
|---|---|
| A/C Compressor Clutch Relay | In Underhood Fuse/Relay Block |
| A/C High Pressure Cut-Off Switch | On Rear Of A/C Compressor |
| A/C Low Pressure Cut-Out Switch | On Top Of A/C Receiver Dryer |
| Camshaft Position Sensor | In Distributor |
| Crankshaft Position Sensor | Behind Crankshaft Pulley |
| Cruise Control Module | Center Of Dash, Left Of Windshield Wiper Module |
| Data Link Connector | Under Left Side Of Instrument Panel |
| EGR Valve Solenoid | Top Of Engine, Left Of Generator |
| Engine Coolant Temperature Sensor | On Left Side Of Engine, Between Spark Plugs |
| EVAP Canister Purge Solenoid | Top Of Engine, Near MAP Sensor |
| EVAP Canister Vent Solenoid | Left Frame Rail, Near Fuel Filter |
| Fuel Pump Relay | In Underhood Fuse/Relay Block |
| Heated Oxygen Sensor - Bank 1, Sensor 1 | Left Front Exhaust Pipe |
| Heated Oxygen Sensor - Bank 1, Sensor 3 | Rear Of Catalytic Converter |
| Heated Oxygen Sensor - Bank 2, Sensor 1 | Right Front Exhaust Pipe |
| Heater & A/C Control Module | Center Of Instrument Panel, At Heater Control |
| Idle Air Control Valve | Left Rear Of Throttle Body |
| Ignition Control Module | Top Of Engine, In Front Of Coil |
| Intake Air Temperature Sensor | In Air Intake Duct |
| Knock Sensor | On Top Rear Of Engine, Above Transmission Bellhousing |
| Manifold Absolute Pressure Sensor | Top Center Of Engine |
| Mass Airflow Sensor | In Air Intake Duct |
| Oil Pressure Switch | Rear Of Engine, Left Of Distributor |
| Throttle Position Sensor | On Side Of Throttle Body |
| Underhood Fuse/Relay Block | Left Front Side Of Engine Compartment, Near Battery |
| Vehicle Control Module | Near Battery |
| Vehicle Speed Sensor | Rear Of Transmission |
COMPONENT LOCATIONS - BLAZER, JIMMY CANADIAN, SONOMA & S10 PICKUP
| Component | Location |
|---|---|
| A/C Compressor Clutch Relay | In Underhood Fuse/Relay Block |
| A/C Compressor High Pressure Cut-Off Switch | On Rear Of A/C Compressor |
| A/C Compressor Cycling Switch | On Accumulator |
| Body Control Module | Lower Rear Of Instrument Panel, On Heater |
| Camshaft Position Sensor | In Distributor |
| Crankshaft Position Sensor | Behind Crankshaft Pulley |
| Cruise Control Module | Left Rear Of Engine Compartment, On Cowl |
| Data Link Connector | Lower Left Side Of Instrument Panel |
| EGR Valve | Top Front Of Engine |
| Engine Coolant Temperature Sensor | Left Side Of Engine, Between Spark Plugs |
| EVAP Canister Purge Solenoid | Top Right Rear Of Engine |
| EVAP Canister Vent Solenoid | On Crossmember, Behind Fuel Tank |
| Fuel Pump Relay | In Underhood Fuse/Relay Block |
| Fuel Tank Pressure Sensor | Top Of Fuel Tank |
| Heated Oxygen Sensor - Bank 1, Sensor 1 | Left Exhaust Pipe, Ahead Of Catalytic Converter |
| Heated Oxygen Sensor - Bank 1, Sensor 3 | Rear Of Catalytic Converter |
| Heated Oxygen Sensor - Bank 2, Sensor 1 | Right Exhaust Pipe, Ahead Of Catalytic Converter |
| Idle Air Control Valve | On Throttle Body |
| Ignition Control Module | Top Right Side Of Engine |
| Intake Air Temperature Sensor | In Air Intake Duct |
| Knock Sensor | Top Rear Of Engine, Above Transmission Bellhousing |
| Manifold Absolute Pressure Sensor | Top Center Of Engine |
| Mass Airflow Sensor | In Air Intake Duct |
| Relay Block | Behind Left Side Of Instrument Panel, Right Of Fuse Block |
| Throttle Position Sensor | On Throttle Body |
| Underhood Fuse/Relay Block | On Left Side Of Engine Compartment, On Wheelwell |
| Vehicle Control Module | Right Front Of Engine Compartment |
| Vehicle Speed Sensor (A/T With 2WD) | Right Rear Of Transmission |
| Vehicle Speed Sensor (A/T With 4WD) | Right Rear Of Transfer Case |
| Vehicle Speed Sensor (M/T With 2WD) | 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.