TPMS issues are popping up again over on the NissanEnthusiast.com Altima forum.(my 08 has an erratic light with no TP issues). I keep my stock 16" tires at 38 psi for a little better MPG.
Someone posted this link to the Nissan Bartec system:
Nissan TPMS - Nissan TPMS Tools & Tire Pressure Monitoring Systems
Their opening statement says:
Welcome to Nissan TPMS - Nissan TPMS Tool & Tire Pressure Monitoring Systems
TPMS or Tire Pressure Monitoring System is fitted to Nissan cars to provide a warning of low pressure on any one of four or five tires on the vehicle (five if TPMS fitted in spare).
This would indicate that over-inflation is not monitored, only low pressures.