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Super Moderator
Jesus built my car
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Do you mean the pump isn't building any pressure? If so the pump may be knackered.
 

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Premium Member
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if the pump isnt working you should have a fault code ,ayc light on ,more than likely it will be 82 or 83 usually cured with a new adj pressure switch.
 

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Not cured, just covered up with an ajustable switch.
If you fit one of these ajustable pressure switches all you are doing is setting the pressure set point lower...thus telling the ayc ecu that the correct pressure has been made when it has not, you have just set the set point lower with your new ajustable pressure switch.
Not fixed just masking the lower output pressure of the ayc pump.:)
 

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Premium Member
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Not cured, just covered up with an ajustable switch.
If you fit one of these ajustable pressure switches all you are doing is setting the pressure set point lower...thus telling the ayc ecu that the correct pressure has been made when it has not, you have just set the set point lower with your new ajustable pressure switch.
Not fixed just masking the lower output pressure of the ayc pump.:)
Is 0.5bar or less goin to make that much difference, two different pumps could vary that much so yes cure it.
 
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