I think you're barking up the wrong tree with the cap. If you had a bad gas cap that was bad enough to prevent the monitor from running, it should have set a small leak code. You can have a slow O2 sensor that's not bad enough to set a code, but too slow to allow the monitor to start. It won't run the EVAP monitor until it completes the O2 monitor. Is there no way to reset the computer? I think there is and then you have to drive 200 miles to be "ready". Replace the gas cap, it's cheap! Get a mechanic to examine the various vacuum hoses under the car and under the hood. I have found some drive cycles on the 'net for Toyota and GM vehicles. The make of the car matters a lot but the model and year could be useful, too. "Not ready" is quite different from failing. NOTES: One of the main causes for the EVAP monitor NOT to run is "Fuel Slosh" in the fuel tank, this will abort the EVAP monitor test! ADDED: Also, to your question, no, if the gas cap was bad, it would run then "Fail" and would set a P04** series code and request the CEL to come on! In other words NONE of the EVAP system components have been tested because the monitor has NOT run! To initiate the EVAP Monitor, the TP MODE PID should = PT, the EVAPDC PID should be > 75%, and the FLI PID should be between 15-85%, or between 30-85% on fuel tanks with a capacity over 25 gallons. Accelerate at part-throttle to between 40-55 mph (64-89 km/h) and maintain that speed for 10 minutes while avoiding any hills or sharp turns. Once this bypass step is completed, repeat test steps 2 through 5. If it is not, or if the altitude is more than 8,000 feet (2,438 m), the vehicle must be parked for a minimum of 8 hours to bypass the EVAP Monitor and clear the DTC P1000. Verify that the IAT PID is within a range of 40-100oF (4.4-37.8oC) so the EVAP Monitor will initiate. Accelerate at part-throttle to 40 mph (64 km/h) and maintain that speed until the ECT PID reaches 170oF (76.7oC). Allow the engine to run at idle speed for 15 seconds. EVAP monitor Test Drive Cycle Instructions: Start the engine without turning off the ignition key. Purge flow between 0.05 lbm/min and 0.10 lbm/min Purge duty cycle between 75% and 100%. (the higher figure being more desirable) Fuel tank pressure between -17.5 H2O and 1.5 H2O vacuum. (5? to 30 minutes) After 30 minutes engine run time the EVAP monitor will NOT run! Fuel level between 15-85% (30-85% for fuel tanks larger than 25 gallons). Engine runtime between 330-1,800 seconds. (I/M readiness code P1000= Monitor Testing Not Complete) Pretest conditions: Engine cool down event completed (ignition "off" for at least 8 hours). The FLI (Fuel Level Indicator) is not within the The EVAP system monitor is the hardest component monitor to get to "Run" on a vehicle! Depending on your driving habits, It may still not have run even in 6,000 miles, the "Drive Cycle HAS to be followed to a tee or it will not run! First, scan the PCM to see if code P1000 is stored. The Temperature or Elevation are outside of the allowed range for the monitor to "Enable" 5. There is a problem with the PCM (Powertrain Control Module) that will not allow the EVAP monitor to run. The "Drive Cycle" has not be executed properly. The "Pre test conditions" have not been met. I am assuming that your Tribute has the 3.0L DOHC (V-6) engine and not the 2.0 DOHC (4 cylinder)? As the other poster stated, the "Not Ready" status means that the component monitor for that system (EVAP) has not even attempted to "Run" (Not that it has run and failed, this will flag a code and turn on the CEL) The reason(s) that the EVAP monitor has not run will fall into a couple of different categories: 1.
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