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Home >> Mazda >> 2001 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0455: EVAP Control System Malfunction, Excessive Leak Detected >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
  2. Turn ignition off and on. Using scan tool, check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTCs P0443 or P1449 are present, diagnose and repair these DTCs first. If DTCs P0443 and P1449 are not present, go to next step.
  3. Inspect fuel filler cap. Ensure filler cap is secure and not leaking. If cap is an after-market brand (non-OEM), replace with factory brand cap and go to step  27. If cap is okay, go to next step.
  4. Turn ignition on. Using scan tool, select SIMULATION TEST. Set PRGV PID duty cycle to 50 percent. If purge solenoid valve is heard operating, go to next step. If purge solenoid valve is not heard operating, replace purge solenoid valve and go to step  27.
  5. Using scan tool, select SIMULATION TEST. Turn CDCV PID on to operate CDCV. If CDCV is heard operating, go to next step. If CDCV does not operate, replace CDCV and go to step  27.
  6. Perform evaporative emission control system inspection. Follow scan tool manufacturer's instructions. If system leaks, check EVAP control system for leakage using evaporative emission tester. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Repair or replace as necessary and go to step  27. If system passes, go to next step.
  7. Review steps necessary to perform EVAP monitor repair verification drive mode. See DRIVE MODES  under SELF-DIAGNOSTIC SYSTEM. If EVAP monitor repair verification drive mode is possible to perform, go to next step. If EVAP monitor repair verification drive mode is not possible to perform, go to step  16.
  8. Turn ignition on. Ensure fuel tank is 1/4-3/4 full. Using scan tool, monitor PID data for BARO, ECT, IAT and FTL V. PID data should read BARO is 21.3 in. Hg or more, ECT is 14-90.5° F (-10-32.5°C), IAT is 14-140°F (-10-60°C) and FTL V is .24-2.0 volts. If any PID is not within specification, allow engine to cool down and repeat this step. If all PIDs are within specification, go to next step.
  9. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Perform EVAP monitor repair verification drive mode. See DRIVE MODES  under SELF-DIAGNOSTIC SYSTEM. Using scan tool, access PID data for CDCV and FTP. If no EVAP system leaks were detected, system is okay at this time and go to step  33. If FTP does not change, evaporative system monitoring is inoperative, go to next step. If FTP changes, but does not reach .59 in. Hg, large leak is present in EVAP system, go to step  13. If FTP reaches .59 in. Hg, but suddenly returns to atmospheric pressure, pressure in fuel tank cannot be reduced and only gas from EVAP lines can be evacuated. Check rollover valve for blockage. Repair or replace as necessary. If rollover valve is okay, repair leaking fuel tank and go to step  27.
  10. Turn ignition on. Disconnect vacuum lines from purge solenoid valve. Using vacuum pump apply vacuum to purge solenoid valve. Purge solenoid valve should hold vacuum. Using scan tool, select SIMULATION TEST and PRGV PID. Set PRGV PID duty cycle to 50 percent. Purge solenoid valve should release vacuum. If purge solenoid valve operates as specified, go to next step. If purge solenoid valve does not operate as specified, replace purge solenoid valve and go to step  27.
  11. Disconnect FTP sensor hose. Using scan tool, check FTP V PID. If FTP V PID is 2.25-2.75 volts, go to next step. If FTP V PID is not 2.25-2.75 volts, replace FTP sensor and go to step  27.
  12. Connect vacuum pump to FTP sensor. Apply 1.97 in. Hg to sensor. Using scan tool, check FTP V PID. If PID data is .45-.55 volt, go to next step. If PID data is not .45-.55 volt, replace FTP sensor and go to step  27.
  13. Remove catch tank located in right side of engine compartment, next to windshield washer reservoir. Inspect for damage or plugging. Replace as necessary and go to step  27. If catch tank is okay, go to next step.
  14. Remove charcoal canister located next to fuel tank. Inspect for damage or plugging. Replace as necessary and to step  27. If charcoal canister is okay, go to next step.
  15. Turn ignition on. Disconnect CDCV vacuum lines. Using vacuum pump apply vacuum to CDCV. CDCV should not hold vacuum. Using scan tool, select SIMULATION TEST and turn CDCV on. CDCV should hold vacuum. If CDCV operates as specified, repair leaking evaporative system hoses and go to step  27. If CDCV does not operate as specified, replace CDCV and go to step  27.
  16. Using scan tool, perform whole system inspection. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Follow scan tool manufacturer's instructions. System pressure should drop and hold for at least 2 minutes. If system does not hold vacuum, go to next step. If system holds vacuum, no leaks are present, system is okay at this time, go to step  27.
  17. Disconnect FTP sensor hose. Using scan tool, access FTP V PID data. If FTP V PID is 2.25-2.75 volts, go to next step. If FTP V PID is not 2.25-2.75 volts, replace FTP sensor and go to step  27.
  18. Connect vacuum pump to fuel tank pressure sensor. Apply 1.97 in. Hg to sensor. Using scan tool, access FTP V PID data. If PID data is .45-.55 volt, go to next step. If PID data is not .45-.55 volt, replace FTP sensor and go to step  27.
  19. Using scan tool, perform evaporative emission control system inspection check from charcoal canister to fuel tank. Follow scan tool manufacturer's instructions. System pressure should drop and hold for at least 2 minutes. If readings are not as specified, go to next step. If readings are as specified, go to step  23.
  20. Inspect fuel tank and fuel gauge sending unit for leakage or damage. Repair or replace as necessary and go to step  27. If fuel tank and fuel gauge sending unit are okay, go to next step.
  21. Check fuel shut off valve. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If fuel shut off valve is okay, go to next step. If fuel shut off valve is faulty, replace fuel tank and go to step  27.
  22. Inspect rollover valve operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If rollover valve is faulty, replace fuel tank. If rollover valve is okay, check for disconnected, improperly installed or damaged vacuum hoses between charcoal canister and fuel tank. Repair or replace as necessary and go to step  27.
  23. Using scan tool, perform evaporative emission control system inspection check from charcoal canister to purge solenoid valve. Follow scan tool manufacturer's instructions. System pressure should drop and hold for at least 2 minutes. If system does not hold vacuum, leaks are present and go to next step. If system holds vacuum, go to step  27.
  24. Inspect purge solenoid valve. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Replace as necessary and go to step  27. If purge solenoid valve is okay, go to next step.
  25. Remove charcoal canister located next to fuel tank. Inspect for damage or plugging. Replace as necessary and to step  27. If charcoal canister is okay, go to next step.
  26. Turn ignition on. Disconnect CDCV vacuum lines. Using vacuum pump apply vacuum pump to CDCV. CDCV should not hold vacuum. Using scan tool, select SIMULATION TEST and turn CDCV on. CDCV should hold vacuum. If CDCV operates as specified, repair leaking evaporative system hoses and go to next step. If CDCV does not operate as specified, replace CDCV and go to next step.
  27. Reconnect all connectors. Ensure fuel tank is 1/4-3/4 full. Turn ignition on. Using scan tool, access PID data for BARO, ECT, IAT and FTL V. PID data should read BARO is 21.3 in. Hg or more, ECT is 14-90.5° F (-10-32.5°C), IAT is 14-140°F (-10-60°C) and FTL V is .24-2.0 volts. If any PID is not within specification, go to next step. If all PIDs are within specification, go to step  30.
    28. NOTE: If DTC appears, ignore DTC.
  28. Using scan tool, perform evaporative emission control system inspection. Follow scan tool manufacturer's instructions. If system fails, go to next step. If system passes, repair is complete and go to step  34.
  29. Turn ignition on. Ensure fuel tank is 1/4-3/4 full. Using scan tool, access PID data for BARO, ECT, IAT and FTL V PID data should read BARO is 21.3 in. Hg or more, ECT is 14-90.5° F (-10-32.5°C), IAT is 14-140°F (-10-60°C) and FTL V is .24-2.0 volts. If any PID is not within specification, allow engine to cool down and repeat this step. If all PIDs are within specification, go to next step.
  30. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Review steps necessary to perform EVAP monitor repair verification drive mode. See DRIVE MODES  under SELF-DIAGNOSTIC SYSTEM. If EVAP monitor repair verification drive mode is not possible, go to next step. If EVAP monitor repair verification drive mode is possible, go to step  32.
  31. Using scan tool, perform evaporative emission control system inspection. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. Follow scan tool manufacturer's instructions. If system fails, replace PCM and go to step  34. If system passes, repair is complete and go to step  34.
  32. Perform EVAP monitor repair verification drive mode. See DRIVE MODES  under SELF-DIAGNOSTIC SYSTEM. Access ON BOARD SYSTEM READINESS TEST menu of GENERIC OBD II FUNCTION and check DRIVE MODE completion status. If EVAPORATIVE PURGE SYSTEM monitor is complete, go to next step. If EVAPORATIVE PURGE SYSTEM monitor is not complete, go to step  29.
  33. Using scan tool, verify TEST #10:22:00 in DIAGNOSTIC MONITORING TEST RESULTS. If test does not exceed MAX value, go to next step. If test exceeds MAX value, replace PCM and go to next step.
  34. Cycle ignition from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
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