Fuel System Monitor Quandary Unearthing the Roots of Its Resistance

The EVAP monitor will only run if the fuel level is between about 1/4 and 3/4. It will not run on a full tank, or a near empty tank. This test is done automatically in the middle of the night, when it is not being driven, after the engine has fully cooled down, and it repeats ... ##Idle the vehicle for 2-3 minutes. This executes the O2S Heater, Misfire, Secondary AIR, Fuel Trim, and Purge system monitors. ##Drive the ... Also related to the OBD II system are “Readiness Monitors”. Monitors are not physical devices, but rather programs within the on-board computer(s) that relay to ... Every vehicle made after 1996 has to have an OBD2 system built in and that system will have various emissions monitors that signify when it ... Most OBD monitors complete more readily using a steady foot driving style during cruise or acceleration modes. · The fuel tank level should be ... chances are the ecu just did not have enough time to cycle and set the readiness codes. give it more time and try again. I read a response on a non tech site regarding saturn drive cycles that you must also cold start with the fuel level between 15 to 85 %, and do ... Incomplete or not ready meaning the test is not completed. It means that the OBD2 system has not been able to run this routine or it has failed. OBD Auto ... A weak cat can cause the monitor to never come ready. EVAP is a system to suck the evaporated fuel out of the tank, through a charcoal filter, ...