Fuel System Monitor Misbehaving? Pinpoint the Root Cause with These Insights

I ran into issues because the vehicle had 4 parameters in the emissions monitors that were 'incomplete' or 'not ready': 1. Fuel system 2. Catalyst 3. ... A vehicle is not ready (and cannot pass a compliance test) if it has not had enough operation since the OBD memory was last cleared (also known as a “code clear ... B. Fuel System Monitor ... The following conditions must be met: ... Fuel level above 1/4 tank. ... Battery condition fair or above, i.e. 11v-14v. ... Idle-up or PTO ... Right. I have been to a few of these rodeos. Usually fuel monitor is the first to complete, then the cat and O2 are usually taking their time. What component of the EVAP system is not ready? ... During this step the OBDII system checks for ignition misfire, fuel trim and EVAP canister ... 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 ... Fuel system normally completes almost instantly after startup, even if the battery was disconnected. If it doesn't it could be because a parameter is out of ... I went to have the truck inspected and initially it failed emissions because the NOX/SCR Monitor and Exhaust Gas Sensor were listed as not ready. Here's some info on the EVAP readiness monitor, courtesy of NY State. ... The EVAP system monitor allows the PCM to test the integrity of the fuel ... monitors the performance of the ignition, fuel metering and emissions systems, including the ... the correct drive cycle for the monitor that is “not ready” for.