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2010 - What is this on back of Power Steering Pump (picture)?

3.4K views 3 replies 3 participants last post by  john12774  
#1 ·
This is my 2010 FOrester Premium with 120K miles. What is this "plug" behind the power steering pump (BOX #2). I susepct Box #1 is the oil sender/pressure switch, but can you tell me what is Box #2?
 
#3 ·
It senses pressure. Mostly for low speed parking maneuvers when there is more strain on the pump/engine. Manufacturers have used a pressure switch to detect load for quite a while now. It's so the idle speed/low rpm can be re adjusted slightly to prevent engine stalling under higher steering demands. Similar to the ECU adjusting idle when the AC compressor puts a load on the engine.

How effective it is is debatable. The steering rack I installed on my 2001 neon didn't have the port for the switch, and I never had an issue. The pressure switch was in the steering rack, instead of the pump.
 
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