Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove lead from gas valve

Measurement:

Test 1.
Measure the resistance between the 2 outer pins of the gas valve.
Expect a resistance of approximately 4.1 Kohms.
Test 2.
Measure the resistance between the top and middle pins of the gas valve solenoid.
Expect a resistance of 1 Mohm or greater.