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Home >> Honda >> 2000 >> CR-V SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Engine Controls - Self-Diagnostics - 4.3L) >> Diagnostic Trouble Code Identification >> DTC P0442: EVAP System Small Leak Detected >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD-II) System Check. See SELF-DIAGNOSTICS - INTRODUCTION article. Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Ensure Tech 2 scan tool is installed. Check for DTCs. If DTC(s) P0446, P0452 or P0453 is also set, go to those DTC(s) in numerical order before proceeding. If DTC(s) do not exist, go to next step.
  3. Turn ignition off. Remove fuel cap. Turn ignition on. Using scan tool, read FUEL TANK VACUUM. If scan tool displays zero in. H2 O go to next step. If scan tool does not display zero in. H2 O, repair faulty fuel tank sensor circuit.
  4. Turn ignition on, engine off. Using scan tool, command EVAP vent solenoid on (closed). Using EVAP diagnostic station pressurize EVAP system to 15 in. H2 O. Monitor EVAP diagnostic station pressure gauge. Turn EVAP diagnostic station rotary switch to HOLD position. If pressure decreases to less than 10 in. H2 O within 2 minutes, go to next step. If pressure does not decrease as specified, see DIAGNOSTIC AIDS .
  5. Disconnect fuel tank vapor and EVAP purge lines from EVAP canister. Plug fuel tank vapor line fitting at EVAP canister. Connect a hand vacuum pump to EVAP purge line fitting at EVAP canister. Ensure EVAP vent solenoid is still commanded ON (closed). Attempt to apply 5 in. Hg to EVAP canister. If vacuum is maintained as specified, go to step  10. If vacuum cannot be maintained as specified, go to next step.
  6. Leave system connected as in previous step. Disconnect vent hose from vent valve. Plug vent hose. Using hand vacuum pump, apply 5 in. Hg vacuum to system. If vacuum cannot be maintained as specified, go to next step. If vacuum is maintained as specified, go to step  8.
  7. Check vent hose for possible cause of vacuum leak. If a problem is found, repair as necessary. After repair, go to step  12. If no problem is found, go to step  9.
  8. Replace EVAP vent solenoid valve. After replacing EVAP solenoid valve, go to step  12.
  9. Replace EVAP canister. After canister replacement, go to step  12.
  10. Cirs, go to step  12. If no problem is found, go to next step.
  11. Using scan tool, command EVAP vent solenoid on (closed). With EVAP diagnostic station connected to EVAP service port, attempt to pressurize EVAP system by leaving EVAP diagnostic station control knob in PRESSURIZE position. Using ultrasonic leak detector in EVAP Diagnostic Station (J41413), locate and repair EVAP system leak. It may be necessary to lower fuel tank to check connections at top of tank. After repairs, go to next step.
  12. Turn ignition on, engine off. Using scan tool, command EVAP vent solenoid on (closed). Using EVAP diagnostic station pressurize EVAP system to 15 in. H2 O. Monitor EVAP diagnostic station pressure gauge. Turn EVAP diagnostic station rotary switch to HOLD position. If pressure decreases to less than 10 in. H2 O within 2 minutes, return to step  2. If pressure does not decrease as specified, go to next step.
  13. Using scan tool, select DTC, CLEAR INFO function. Select scan tool, function SERVICE BAY TEST for EVAP. Perform any repairs or actions indicated by scan tool. After SERVICE BAY TEST, go to next step.
  14. Using scan tool, select Read and Record INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, system is okay.
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