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Message: <blockquote data-quote="JerZeyStangz" data-source="post: 484950" data-attributes="member: 8031">P1000 means: Description -The OBD monitors are performed during the OBD Drive Cycle. The P1000 will be stored in continuous memory if any of the OBD monitors do not complete their full diagnostic check. Possible Causes:  * Vehicle is new from the factory  * Battery or PCM had recently been disconnected  * An OBD monitor failure had occurred before completion of an OBD drive cycle  * PCM DTCs have recently been cleared with a scan tool  * PTO circuit is shorted to VPWR or B+ or PTO is on during testingDiagnostic Aides -The Ford P1000, inspection/maintenance (I/M) readiness function is part of the PCM strategy. A battery disconnection or clearing codes using a scan tool results in the various I/M readiness bits being set to a "not-ready" condition. As each non-continuous OBD monitor completes a full diagnostic check, the I/M readiness bit associated with that monitor is set to a "ready" condition. This may take 1 or 2 drive cycles based on whether malfunctions are detected or not. The readiness bits for comprehensive component monitoring, misfire and fuel system monitoring are considered complete once all the non-continuous monitors have been evaluated. Because the EVAP system monitor requires certain ambient conditions to run, special logic can "bypass" the monitor for purpose of clearing the EVAP system I/M readiness bit due to continued presence of these extreme conditions.Note: The P1000 does not need to be cleared from the PCM except to pass an I/M test.</blockquote>