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The switch's function is to signal the PCM when the power-steering system exceeds its normal operating hydraulic pressure, like when you cut the steering wheel all the way to one side and hear that hissing sound from the pump. The PCM then raises the idle speed and/or disengages the air-conditioning compressor to prevent the engine from stalling.

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โˆ™ 2008-01-30 04:06:58
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Q: What does the power steering pressure switch do?
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