Rick,

The amal valve completely diverts air away from the actuator below 2.5k rpm. Above 2.5k rpm, the valve is open and closed at a rapid rate to supply pulses of air to the actuator. The ECU alters the rate of pulses to maintain a constant boost pressure from first coming on boost to the limiter (or near enough).

The AMAL valve should be divert air from the compressor to the actuator when unplugged or switched off. When it is switched on, it will divert air to the air box.