Open pin failures::
Remove one or more jumpers on the J2 - OPEN to introduce an open pin failure (= broken PCB track, broken feeding line, open sensor connection).
Short to VDD / GND / another pin:
Use a dual female jumper cable and short J3 pin headers, SHORT to introduce the short to VDD/ GND/ another pin failure. For ease of use, J3 – SHORT provides access to VDD and GND pin headers.