PSPICE: DC Sweep of zener diode characteristics not working
Could be either or both issues: 1) You did not specify a BV parameter (breakdown voltage), or 2) Your Y-axis for current is way too big.

If Y-axis for current is same as the voltage (0 to 15) then you will barely make out the current reading. Even if zener was short, that would only be 30 mA at 14 Volts (14V / 470 Ohms). :)