Cycle Valve Bench Testing

Mod Details

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The cycle wastegate control valve is what controls the flow to and from the wastegate. The wastegate controls the boost that the turbo can create.

It’s a fairly simple device. It’s just a solenoid that swaps the input and output of the top pipe. This is the cycle valve.

The connector only has 2 connections. A positive connection and the negative connection. The + and the – is actually printed on each side of the connector.

Without power, blowing through the top hose will make the air come out the hose on the right in the photo. (electrical connector side). If you blow through the left hand tube, nothing will go through.

However, when you apply power, blowing through the top hose will make the air come out the hose on the left in the photo. If you blow through the right hand tube, nothing will go through.

If the swap over doesn’t happen or you can blow down the pipe that should be blocked off, it’s broken.

Powering The Cycle Valve

You can power it directly from a 12v car battery if you like but I used a bench power supply set to 12 volts.

Where Can I Get A New Cycle Waste Valve?

Normally this is where I would call you an idiot and suggest you go to smart for smart parts. However, you are saved this time from ridicule as smart no longer sell this part.

So you are screwed.

Well no, not really. Thankfully this unit is fitted to Mercedes, BMW, Seat, Ford, Skoda and VW models. The exact item is a Pierberg 7.22632.01 so get searching on eBay.