Nikon ED 17-55mm f/2.8G IF Repair Manual page 69

The total number of pulses when inspecting must be within the standard.
Standard of the total pulses ： 4044 ± 125 PLUSE(S)
TYPE OF LENS： AF-S 17-55mm/2.8G DX
THE TOTAL NUMBER OF PULSE(S) AT INSPECTION.［PULSE(S)］ ---- 4044
STANDARD FOR THE TOTAL PULSE NUMBER : FROM 3919 TO 4169［PULSE(S)］
PUSH OK TO RETURN TO MENU.
CPU VERSION：2.01.00
IN STANDARD.
OK
- L51 ･ AF-S DX17-55/2.8G -
INC
JAA78851-R.3617.A