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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0444: EVAP Purge Valve Control Circuit Open >> Diagnostic Procedures

Diagnostic Procedures

  1. Turn ignition on, with engine off. Using scan tool, monitor EVAP PURGE - LOW VOLT or EVAP PURGE - OPEN test. If scan tool indicates TEST FAIL, go to next step. If scan tool does not indicate TEST FAIL, problem is intermittent. See DIAGNOSTIC AIDS  .
  2. Check EMISS fuse (10-amp) located in underhood fuse block. If fuse is blown, replace and retest system. If fuse is okay, go to next step.
  3. Disconnect EVAP purge solenoid harness connector. Connect a Noid Light (SA9194E) to EVAP purge solenoid harness connector. Using scan tool, monitor EVAP PURGE - LOW VOLT or EVAP PURGE - OPEN test. If scan tool does not indicate TEST PASS, go to next step. If scan tool indicates TEST PASS, check for terminal tightness. Repair as necessary. If terminals are okay, replace EVAP purge solenoid.
  4. Verify noid light. If noid light is on, check for short to ground or PCM in EVAP purge solenoid circuit (Dark Green/White wire) to PCM. If noid light is not on, go to next step.
  5. Using test light connected to ground, probe EVAP purge solenoid harness connector terminal "A" (Pink wire). If test light illuminates, check for open in circuit (Dark Green/White wire) between solenoid and PCM. Repair as necessary. If circuit is okay, replace PCM. If test light does not illuminate, check for open in circuit (Pink wire) between solenoid and fuse block.
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