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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 83 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P1441: EVAP SYSTEM FLOW DURING NON-PURGEDTC PARAMETERS
1999 GMC Forward Control 5.7 R, Automatic

DTC Parameters

1999 GMC Forward Control 5.7 R, AutomaticSECTION DTC Parameters
WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
  • Engine running.
  • EVAP vent solenoid is commanded on (closed).
  • EVAP purge solenoid is commanded off (closed).
  • Fuel tank between 15-85 percent.
  • BARO more than 75 kPa.
  • Both ECT and IAT are between 39-86°F (4-30°C) at engine start-up.
  • ECT and IAT are within 14°F (8°C) of each other at start-up.
  • Vehicle speed less than 70 MPH.
  • Throttle angle is 10-35 percent.
  • No ECT, fuel tank pressure, IAT, MAP, HO2S1, PCM internal fault, TP or vehicle speed DTCs are set.

DTC sets when fuel tank pressure sensor voltage is indicating less than 2.0 volts (continuous purge flow) during EVAP diagnostic system test for more than 75 seconds.

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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.