Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect the bottom connector from spark generator

Measurement:

Measure for continuity (zero resistance) on both of the wires (blue and brown)
running from the spark generator connector to pins 1 and 2 at HV2 on the PCB.
Inspect harness and connectors for good overall condition.
Is the harness satisfactory?