Illuminating the Fuel System Monitor Conundrum Reasons for Its Unresponsiveness

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. Evap is a part of the fuel system. If the evap tests are off. The fuel system monitor will never set. And neither will the catalyst. You ... Ensure that the vehicle meets the conditions for a cold start listed above. ⇒ If the evaporative emission (EVAP) I/M System Status indicator ... The fuel level being empty, and now full, may have a lot to do with your troubles. Once it gets down to around 3/4 tank, I'd start watching the ... I can have that one show not ready. Fuel system must show ready to pass smog.I have replaced the fuel cap, battery, fresh fuel multiple times, ... The ECU will once again self-test the EGR System, EVAP Purge System and Long Term Fuel Trims. ACCELERATE: Go ahead and accelerate again at 3 ... Now, switch the rear defroster and ac off and keep the speed of your vehicle at 90 km/hr (55MPH) nearly for 3 minutes. During this period, the purge and Fuel ... The "Readiness Monitor" reports. Catalyst: Not Ready Fuel System: Not Ready O2 Sensor: Not Ready O2 Sensor Heater: Not Ready 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 ... The " Catalytic, Evap, 2nd Sys, O2 Sensor (both heated & non-heated), and EGR System are all marked as not ready." Those all require specific ...