10/30/2023 0 Comments Evap system monitor inc s2000![]() The means by which the fuel vapors flow to different components of the EVAP system. Purge Valve/Sensor:Īllows engine intake vacuum to siphon the precise amount of fuel vapors from the EVAP canister into the engine intake manifold. This allows the flow of the fuel vapors from the fuel tank into the EVAP canister. The EVAP canister houses 1-2 pounds of activated charcoal that acts like a sponge by absorbing and storing fuel vapors until the purge valve opens and allows the vacuum of the engine intake to siphon the fuel vapors from the charcoal into the engine intake manifold. This canister is connected to the fuel tank by the tank vent line. This prevents liquid gasoline from entering the EVAP canister, which would overload its ability to store fuel vapors. Damaged or missing gas caps are the most common cause of EVAP system failure codes that trigger the check engine light. The gas cap seals off the filler neck of the gas tank from the outside atmoshpere. But, you know when people tell you not to continue filling the tank after the pump automatically stops? That is because the tank has some expansion space at the top so the fuel can expand without overflowing or forcing the EVAP system to leak. The fuel tank obviously stores the gasoline when you fill up. The major components of the EVAP system are: Fuel Tank: ![]() These uncontrolled evaporative emissions account for as much as 20% of the pollution produced by a vehicle! EVAP System Components Gasoline evaporates very quickly, so if the fuel system is open to the atmosphere a vehicle can pollute 24 hours per day without even being turned on. Hydrocarbons form smog when they react with air and sunlight. This is important because fuel vapors contain a variety of hydrocarbons. The Evaporative Emission Control (EVAP) System seals the fuel system of the vehicle in order to prevent fuel vapors from the fuel tank and fuel system from escaping into the atmosphere. Again, don’t press the clutch or brakes or shift gears.What is the Evaporative Emission Control (EVAP) System? This will perform the same diagnostics as in step 5. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.ĭecelerate. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. Hold a steady speed of 88km/hr (55mph) for five minutes. This will perform the same diagnostics as in step 3. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.Īccelerate. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.ĭecelerate. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. This will test the O2 heater, Passive Air, Purge “No Flow”, Misfire and if closed loop is achieved, Fuel Trim.Īccelerate. The more electrical load you can apply the better. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run. In order to be classified as a cold start the engine coolant temperature must be below 50?C (122?F) and within 6?C (11?F) of the ambient air temperature at startup. To perform an OBDII Driving cycle do the following:Ĭold Start. A complete driving cycle can be done in under fifteen minutes. ![]() See belowĪ complete driving cycle should perform diagnostics on all systems. I have the GM drive cycle and I’m betting if you follow that, you will cover the Jeep drive cycle.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |