Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove the 2 wire connector from the PCB
Disconnect the electrical lead from the spark generator

Measurement:

Measure the resistance between the wires of the spark generator harness.
Expect continuity / zero resistance on each test.
Also visually inspect the condition of the harness.