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Home >> Cadillac >> 1998 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0441 - EVAP System Incorrect Purge Flow >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  , then go to next step.
  2. Turn ignition off. Disconnect vacuum source line from purge valve. Connect a hand-held vacuum pump to valve. Apply 15 in. Hg to purge valve. If purge valve holds vacuum, see DIAGNOSTIC AIDS. If purge valve does not hold vacuum, go to next step.
  3. Replace purge valve. Inspect vacuum lines for traces of carbon. Carbon escaping from canister will cause new purge valve to fail. If this condition is present, replace canister. After replacing purge valve, go to next step.
  4. Turn ignition off for 15 seconds. Using scan tool, select CLEAR INFO or CLEAR DTCs function to clear DTCs. Start engine and operate vehicle as close to conditions required for this DTC to set. Recheck for DTCs. If this DTC resets, repeat step 2). If this DTC does not reset, go to next step.
  5. If other DTCs were present during OBD system check and have not been diagnosed, go to applicable DTC. If no other DTCs are present, system is okay.
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