Cov tsheb niaj hnub cia siab rau On-Board Diagnostics II (OBD-II) system los saib xyuas kev ua haujlwm ntawm lub cav thiab emissions. Thaum koj lub tsheb ua tsis tau qhov kev xeem emissions, OBD-II qhov chaw kuaj mob ua koj lub cuab yeej zoo tshaj plaws rau kev txheeb xyuas thiab daws teeb meem. Hauv qab no, peb piav qhia yuav ua li cas OBD-II scanners ua haujlwm thiab muab cov kev daws teeb meem rau 10 tus lej teeb meem uas tuaj yeem ua rau muaj kev tsis ua haujlwm.
Yuav ua li cas OBD-II Scanners pab kuaj cov teeb meem emissions
- Nyeem Diagnostic Trouble Codes (DTCs):
- OBD-II scanners retrieve codes (piv txwv li, P0171, P0420) uas taw qhia cov kab ke ua haujlwm tsis zoo cuam tshuam rau emissions.
- Piv txwv: Ap0420 uacode qhia tias catalytic converter inefficiency.
- Live Data Streaming:
- Saib xyuas cov ntaub ntawv ntawm lub sijhawm sensor (piv txwv li, oxygen sensor voltage, roj trim) txhawm rau txheeb xyuas qhov tsis sib xws.
- Saib "Readiness Monitors":
- Kev ntsuam xyuas emissions xav kom txhua tus saib (xws li EVAP, catalytic converter) kom "npaj." Scanners paub meej tias cov tshuab tau ua tiav kev kuaj xyuas tus kheej.
- Freeze Frame Cov ntaub ntawv:
- Tshawb xyuas cov xwm txheej khaws cia (lub cav thauj khoom, RPM, qhov kub thiab txias) thaum lub sij hawm tus lej tau ua rau rov ua dua thiab kuaj xyuas cov teeb meem.
- Clear Codes thiab Reset Monitors:
- Tom qab kho, rov pib dua lub system kom paub tseeb kho thiab npaj rau kev rov sim dua.
10 Feem ntau OBD-II Codes Ua rau Emissions Failures
1. P0420/P0430 – Catalyst System Efficiency hauv qab qhov pib
- Ua rau:Ua tsis tiav catalytic converter, oxygen sensor, lossis tso pa tawm.
- Kho:
- Test oxygen sensor ua haujlwm.
- Tshawb xyuas qhov tso pa tawm.
- Hloov cov catalytic converter yog tias degraded.
2. P0171/P0174 – System Too Lean
- Ua rau:Cov cua xau, ua txhaum MAF sensor, lossis tsis muaj roj twj tso kua mis.
- Kho:
- Tshawb xyuas lub tshuab nqus tsev vacuum (cov hoses tawg, nqus tau pa).
- Ntxuav / hloov MAF sensor.
- Kuaj roj siab.
3. P0442 – Me evaporative Emission Leak
- Ua rau:Loose gas cap, tawg EVAP hose, los yog faulty purge valve.
- Kho:
- Tighten lossis hloov lub hau roj.
- Cov pa luam yeeb-kuaj EVAP qhov system txhawm rau nrhiav cov pa xau.
4. P0300 – Random/ntau lub tog raj kheej Misfire
- Ua rau:Hnav cov hlua hluav taws xob, hluav taws xob tsis zoo, lossis qis compression.
- Kho:
- Hloov cov hluav taws xob / hluav taws xob coils.
- Ua ib qho kev sim compression.
5. P0401 – Exhaust Gas Recirculation (EGR) Flow tsis txaus
- Ua rau:Clogged EGR passages los yog faulty EGR valve.
- Kho:
- Ntxuav cov pa roj carbon ntau los ntawm EGR valve thiab cov kab.
- Hloov lub EGR valve uas daig.
6. P0133 – O2 Sensor Circuit Court qeeb teb (Bank 1, Sensor 1)
- Ua rau:Degraded upstream oxygen sensor.
- Kho:
- Hloov cov pa oxygen sensor.
- Tshawb xyuas cov kab hluav taws xob puas.
7. P0455 – Loj EVAP Leak
- Ua rau:Disconnected EVAP hose, faulty charcoal canister, los yog puas roj tank.
- Kho:
- Tshawb xyuas EVAP hoses thiab kev sib txuas.
- Hloov lub charcoal canister yog tawg.
8. P0128 – Coolant Thermostat Malfunction
- Ua rau:Thermostat daig qhib, ua rau lub cav khiav txias dhau.
- Kho:
- Hloov lub ntsuas sov.
- Xyuas kom cov coolant txaus.
9. P0446 – EVAP Qhov Cuab Yeej Tswj Circuit Court ua haujlwm tsis zoo
- Ua rau:Faulty vent solenoid los yog blocked vent kab.
- Kho:
- Kuaj lub qhov cua solenoid.
- Tshem cov khib nyiab los ntawm txoj kab cua.
10. P1133 – Fuel Air Metering Correlation (Toyota/Lexus)
- Ua rau:Huab cua/roj piv tsis sib npaug vim MAF sensor los yog lub tshuab nqus tsev vacuum.
- Kho:
- Ntxuav MAF sensor.
- Tshawb xyuas cov pa tawm tsis tau ntsuas.
Cov kauj ruam los xyuas kom meej Emissions Test Success
- Diagnose Codes Thaum Ntxov:Siv OBD-II scanner los txheeb xyuas cov teeb meem ntau lub lis piam ua ntej kuaj.
- Kho kom sai:Hais txog cov teeb meem me me (piv txwv li, gas cap leaks) ua ntej lawv ua rau cov lej loj dua.
- Tsav Cycle tiav:Tom qab tshem cov lis dej num, ua kom tiav lub voj voog tsav kom rov pib dua kev saib xyuas.
- Pre-Test Scan:Xyuas kom tsis muaj cov lej xa rov qab thiab txhua tus saib yog "npaj" ua ntej tshuaj xyuas.
Cov Lus Qhia Kawg
- Kev nqis peev hauv ibmid-range OBD-II scanner(piv txwv li, iKiKin) rau cov lus qhia ntxaws ntxaws.
- Rau cov lis dej num nyuaj (xws li, catalytic converter tsis ua hauj lwm), sab laj nrog tus kws kho tsheb.
- Kev saib xyuas tsis tu ncua (tshwj xeeb, cov lim cua) tiv thaiv ntau yam teeb meem ntsig txog emissions.
Los ntawm kev siv koj lub OBD-II scanner lub peev xwm, koj tuaj yeem kuaj xyuas thiab kho cov teeb meem emissions tau zoo, ua kom muaj kev sib tw ntawm koj qhov kev tshuaj ntsuam tom ntej!
Post lub sij hawm: May-20-2025
