BTW, on the R-series it's easy to test.. just unplug the idle actuator, and switch the ignition on and see whether Idle Actuator for Cylinder 1 or 2 is noted as faulty...
for the other bikes (that don't have Idles actuators per cylinder), I would suggest unplugging the electrical connection to a cylinder, then trying to start it, and then reading the fault codes... noting whether the fault codes states Cylinder 1, 2, 3 or 4 (or 5 or 6 for the K16)
best,
Stephan