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Home >> Isuzu >> 1996 >> Rodeo LS, 2.6 E >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.6L 4-CYL >> Circuit Testing >> DTC P1441 - EVAP System Flow During Non-Purge >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform OBD-II System Check. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. 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 and allow it to idle. Using scan tool, read EVAP VACUUM SW. while commanding 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. Allow engine to idle. 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 and go to step 11). If no short is found, go tostep 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. Allow engine to idle. If vacuum is more than 5 in H(2)O, go to step 9). If vacuum is 5 in H(2)O or less, go to step 10).
  8. Replace PCM. Replacement PCM requires special equipment for programming procedures. Go to next step.
  9. Replace EVAP purge solenoid and go to step 11).
  10. Replace EVAP vacuum switch and go to next step.
  11. Read and record FAIL RECORDS data for DTC P1441. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P1441 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P1441 FAILED THIS IGN, repair is complete.
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