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Home >> GMC >> 2001 >> Jimmy 4D Utility, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P1441: Evaporative System - Vacuum Is Greater Than Calibrated Value ("L" & "M" Series) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK . After performing powertrain diagnostic system check, go to next step.
  2. Using scan tool, retrieve DTCs. If DTCs P0443, P0449, P0452 or P0453 is also set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTCs P0443, P0449, P0452 or P0453 is not set, go to next step.
  3. Remove fuel fill cap. Using scan tool, monitor Fuel Tank Pressure (FTP). If scan tool indicates that FTP is within -0.5 to 0.5 in. H2O, go to next step. If scan tool does not indicate that FTP is within -0.5 to 0.5 in. H2O, go to DTC P0453 .
  4. Disconnect EVAP canister purge pipe from EVAP canister purge solenoid. Install a hand-held vacuum gauge to EVAP canister purge port. Disconnect EVAP canister purge solenoid harness connector. Monitor vacuum on vacuum gauge. Start and operate engine at idle. Increase idle to 1200-1500 RPM. If vacuum increases, go to next step. If vacuum does not increase, see DIAGNOSTIC AIDS .
  5. Replace EVAP canister purge solenoid. After replacing solenoid, go to next step.
  6. Using scan tool, review and record the FREEZE FRAME/FAILURE RECORDS data. Using scan tool, clear DTCs and perform Service Bay Test. If scan tool indicates that service bay test passed, go to next step. If scan tool does not indicate that service bay test passed, go to step  3.
  7. Using a scan tool, observe the stored information and Capture Info. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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