International ESC Breakout box

My international 7500 Truck have AC fault code and when check the diagnostic manual I found below:
install the breakout box at ESC connector (1600), and check the status of the control head diagnostic line at connector (1600), terminal 8.

1. If the signal on the diagnostic line is an alternating voltage of 1 pulse per second (0.5 sec high/0.5 sec low), replace the HVAC control head. (Control head is indicating a multiple fault when none exists.)
   low < 2 Vdc
   high > 7 Vdc
2. If the signal on the diagnostic line is not an alternating voltage of 1 pulse per second, replace the ESC.

Can I make the test without this tool?