i may be wrong, but i don't think there is a P1000.
if it is:
P0100 Mass or Volume Air Flow Circuit Malfunction
P1100 MAF Sensor Intermittent/ Check of all OBDII Systems Not Complete
edit
P1000 Monitor Testing Not Complete
here's a link to codes:
http://www.2carpros.com/trouble_codes/trouble-code-P1000-P1099.htm
if it is:
P0100 Mass or Volume Air Flow Circuit Malfunction
P1100 MAF Sensor Intermittent/ Check of all OBDII Systems Not Complete
edit
P1000 Monitor Testing Not Complete
here's a link to codes:
http://www.2carpros.com/trouble_codes/trouble-code-P1000-P1099.htm