2020年11月22日 · The slight vacuum causes the NVLD device to close an internal switch that signals the ECM that a vacuum is present. The vacuum must hold and switch remained closed for a certain time period to pass the medium leak test. If the switch opens too early code P0442 can be set. So there is no easy way to bypass and fool the software logic.

2018年3月4日 · You have to be careful when resolving evaporative leak code P0442. Here is a statement of the criteria test for this code. P0442-EVAP SYSTEM MEDIUM LEAK When Monitored: Engine Running. Cold start test. Fuel Level greater than 12%. Ambient Temperature between 4°C and 32°C (39°F and 89°F) Close Loop fuel system. Test runs when small leak …

2017年10月9日 · 2008 Impala, 3.5 V6. The CEL was on this morning, and the OBDII reader determined that it was from a P0455 code, meaning the Evap system has a leak. I bought gas over the weekend, so it's possible that I didn't tighten the cap properly. After doing so, the light remains on. Are there any...

2003年1月6日 · Here is a Y T video where someone dropped the fuel tank on a PT Cruiser and inspected the NVLD assembly. Looks like Chrysler engineers did NOT make it easy to access components.

2014年10月30日 · P0442 Evaporative Emission (EVAP) System Small Leak Detected P0455 Evaporative Emission (EVAP) System Large Leak Detected P0456 EVAP System Leak (faulty leak detection pump?) First thing was to verify that the gas cap was on tight - seems to be.

2022年4月26日 · It has lost/used a qt. between every 3K oil change since new. PCV hose has been replaced and clamped 3 or 4 times since first code for PO442 Emission Control System (small)/PO455(large), both have shown up over the years, corrected w/attention to PCV hose, new hose, clamps, tightening clamps.

2023年12月11日 · Some background: I am the original owner of 2003 PT Cruiser GT (automatic). I used it as a daily driver from 2003 until 2017 when I parked it because of recurring engine issues (more on this below) and ABS issues. The PCM was replaced by a repair shop but the problems persisted. Earlier this...

2023年10月23日 · M37 1952 3.8, Charger 1983 1.6, 1984 2.2 Caravan 1991 3.0, 1998 3.3, Sebring 2004 2.7

2016年8月22日 · Hello everyone, I have a 2002 grand caravan EX 3.8L. Pulled the codes and I have 2 issues. Large evap leak (and small evap leak) and oxygen sensor. The oxygen sensor is self explanatory but the large evap leak is not. Additional details - when I am driving and come to a stop or, immediately...

2016年5月2日 · Now if the switch closes for a period of time but opens before the expected time then a medium / large leak is recorded. This situation could set codes P0442 or P0456. The other evaporative leak test the system performs is a non-intrusive leak test.