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 LOCATIONS8.1L (VIN G) "G" SERIES
2003 Chevrolet TrailBlazer 4.2 S, 4WD
8.1L (VIN G) "G" Series
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION 8.1L (VIN G) "G" 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 8.1L (VIN G) "G" SERIES
| Component | Location |
|---|---|
| Acceleration Pedal Position Sensor | Behind Accelerator Pedal |
| Camshaft Position (CMP) Sensor | Left Front Of Engine |
| Crankshaft Position (CKP) Sensor | Right Rear Of Engine |
| Data Link Connector (DLC) | Below Steering Column |
| Engine Coolant Temperature (ECT) Sensor | Right Side Of Engine |
| Exhaust Gas Recirculation (EGR) Valve | Top Rear Of Engine |
| Fuel Pump Relay | Underhood Fuse Block |
| Fuel Tank Pressure Sensor | In Fuel Tank |
| Heated Oxygen Sensor (HO2S) Bank 1, Sensor 1 | Left Exhaust Pipe, Ahead Of Catalytic Converter |
| Heated Oxygen Sensor (HO2S) Bank 1, Sensor 2 | Left Exhaust Pipe, After Catalytic Converter |
| Heated Oxygen Sensor (HO2S) Bank 2, Sensor 1 | Right Exhaust Pipe, Ahead Of Catalytic Converter |
| Heated Oxygen Sensor (HO2S) Bank 2, Sensor 2 | Right Exhaust Pipe, After Catalytic Converter |
| Intake Air Temperature (IAT) Sensor | Part Of Intake Air Duct |
| Knock Sensor 1 | Lower Left Side Of Engine |
| Knock Sensor 2 | Lower Right Side Of Engine |
| Manifold Absolute Pressure (MAP) Sensor | Top Rear Of Intake Manifold |
| Mass Airflow (MAF) Sensor | Front Top Of Engine |
| Powertrain Control Module (PCM) | On Left Inner Fender |
| Secondary Air Injection Reaction Relay | In Underhood Fuse Block |
| Throttle Actuator Control (TAC) Module | Left Rear Of Engine Compartment |
| Throttle Actuator Control Motor | Right Side Of Throttle Body |
| Throttle Position (TP) Sensor (Dual Track) | Left Side Of Throttle Body |
| Vehicle Speed Sensor | On 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.