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Home >> Chevrolet >> 1998 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1441 - EVAP System Flow During Non-Purge >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Turn ignition off. Connect Enhanced EVAP Pressure Diagnostic Station (J-41413) to EVAP service port. Turn diagnostic station rotary switch to PURGE position. Start engine. Monitor vacuum on diagnostic station gauge. If vacuum is greater than -15 in. H2O and steady, go to next step. If vacuum is not greater than -15 in. H2O, see DIAGNOSTIC AIDS.
  3. Turn ignition off. Disconnect EVAP purge solenoid harness connector. Turn ignition on, engine off. Using a test light connected to battery voltage, probe EVAP solenoid harness connector terminal "B". If test light illuminates, go to next step. If test light does not illuminate, go to step 6).
  4. Turn ignition off. Disconnect VCM harness connector. Turn ignition on, engine off. Connect test light between battery voltage and EVAP purge solenoid connector terminal "B". If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
  5. Repair short to ground in EVAP canister purge valve driver circuit. After repairs, go to step 8).
  6. Replace EVAP purge solenoid. After replacing solenoid, go to step 8).
  7. Replace VCM. Program replacement PCM using required equipment. After replacing VCM, go to next step.
  8. Using scan tool, select DTC and CLEAR DTC INFO function. Perform SERVICE BAY TEST for EVAP. After performing service bay test, go to next step.
  9. Using scan tool, select FREEZE FRAME and FAILURE RECORDS function. If any DTCs are present, diagnose affected DTCs. If no additional DTCs are present, system is okay.
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