'Check injection' message after engine fail?

This message flashed up on the display of my Scenic Mk2 1.6 petrol engine as it dramatically decelerated form 70 to 0. Car would not restart, although it spins over very quickly now, with no firing up. warning message has gone. What's happened? I thought maybe the timing belt had snapped but the 'check injection' message has confused me. Any ideas please?