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Home >> Isuzu >> 1997 >> Rodeo LS, 2.6 E >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.6L >> Circuit Testing >> DTC P1441 - EVAP System Flow During Non-Purge >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform OBD-II System Check. See BASIC TESTING article. Go to next step.
  2. Turn ignition on, engine off. Using scan tool, read EVAP VACUUM SW. If scan tool displays NO PURGE, go to next step. If scan tool does not display NO PURGE, go to DTC P1442.
  3. Turn engine on. Using scan tool, command idle to 1500 RPM and read EVAP VACUUM SW. Command EVAP purge solenoid off. If scan tool displays NO PURGE, go to next step. If scan tool does not display NO PURGE, go to step 5).
  4. Turn ignition on, engine off. Using scan tool, read and record FAILS RECORD DATA. Operate vehicle within conditions noted in FAILED RECORDS DATA. Read SPECIFIC DTC. If scan tool displays DTC P1441 FAILED THIS IGN, go to next step. If scan tool does not display DTC P1441 FAILED THIS IGN, go to DIAGNOSTIC AIDS  .
  5. Disconnect EVAP purge solenoid harness connector. Set engine idle 1500 RPM. Read EVAP VACUUM SW. If scan tool displays NO PURGE, go to next step. If scan tool does not display NO PURGE, go to step 7).
  6. Turn ignition off. Disconnect PCM connectors. Check EVAP purge solenoid driver circuit for short to ground. If short to ground is found, repair as necessary. Retest system. If no short is found, go to step 8).
  7. Leave EVAP purge solenoid harness connector disconnected. Disconnect vacuum signal hose from EVAP purge vacuum switch. Connect a vacuum gauge to signal hose. Start engine, allow engine to idle. Snap throttle open and watch vacuum gauge. If vacuum immediately increases, go to step 9). If vacuum does not immediately increase, go to step 10).
  8. Replace PCM. Replacement PCM requires special equipment for programming procedures. Retest system.
  9. Replace EVAP purge solenoid. Retest system.
  10. Replace EVAP vacuum switch. Retest system.
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