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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 4.2LDIAGNOSTIC 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
  1. 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.
  2. Disconnect the purge pipe from the EVAP purge solenoid. Install a hand-held vacuum gauge to the EVAP purge solenoid purge port. Disconnect the EVAP purge solenoid harness connector. Monitor vacuum on the vacuum gauge. Start and allow engine to idle. Increase the idle to 1200-1500 RPM. Does the vacuum gauge indicate an increase in vacuum? If yes, go to step  8. If no, go to next step.
  3. Connect the EVAP purge solenoid harness connector. Monitor vacuum on the vacuum gauge. Increase the idle to 1200-1500 RPM. Does the vacuum gauge indicate an increase in vacuum? If yes, go to step  5. If no, go to next step.
  4. Turn ignition off. Remove and then install fuel fill cap. Turn ignition on, with engine off. Observe the Fuel Tank Pressure Sensor parameter with scan tool. Is the Fuel Tank Pressure Sensor parameter within -0.5 to 0.5 in. H2O? If yes, see DIAGNOSTIC AIDS . If no, go to step  6.
  5. Test the EVAP purge solenoid control circuit for a short to ground. Did you find and correct the conditions? If yes, go to step  9. If no, go to step  8.
  6. Test for an intermittent and for a poor connection at the EVAP purge solenoid. Did you find and correct the condition? If yes, go to step  9. If no, go to next step.
  7. Replace FTP sensor. After replacing sensor, go to step  9.
  8. Replace EVAP canister purge solenoid. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT . After replacing solenoid, go to next step.
  9. Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions For Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  10. Observe the stored information, Capture Info with scan tool. Does 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.