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 113 (ENGINE CONTROLS SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P1441: EVAP SYSTEM FLOW DURING NON-PURGEDIAGNOSTIC PROCEDURES
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Diagnostic Procedures
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Pontiac Aztek and 2002 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM.
- Are DTCs P0443, P0449, P0452 or P0453 also set? If yes, see DTC P0443: EVAP PURGE SOLENOID CONTROL CIRCUIT , DTC P0449: EVAP VENT VALVE PERFORMANCE , DTC P0452: FUEL TANK PRESSURE SENSOR - LOW VOLTAGE or DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE . If no, go to next step.
- Remove the fuel fill cap. Turn ON the ignition, with the engine OFF. With a scan tool, monitor the FTP. Does the scan tool indicate FTP -0.5-0.5 in. H2O? If yes, go to next step. If no, see DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE .
- Disconnect the EVAP purge pipe from the EVAP canister purge valve. Install a hand held vacuum gauge to the EVAP purge port. Disconnect the EVAP canister purge valve harness connector. Monitor vacuum on the vacuum gauge. Start the engine and allow the engine to idle. Increase the idle to 1200-1500 RPM. Does the vacuum gauge indicate an increase in vacuum? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
- Replace the EVAP canister purge valve. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
- Monitor the fuel tank pressure with a scan tool. Start the engine and allow the engine to idle for 3 seconds. Does the scan tool indicate fuel tank pressure is -0.5-0.5 in. H2O? If yes, go to next step. If no, go to step 3.
- Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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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.