Hi Dave, This relates to the solenoid that controls the valve timing.Remove the air filter assembly to gain access.
Unplug the connector and check for NBV with KOEO. Resistance of solenoid should be circa 7.2ohms at 20C. Duty cycle should be: 0-2% at idle, (warm engine, AC off and no load). Rev to 2000rpm and duty should be 0-50%