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Registered User
Join Date: Jun 2004
Location: NJ
Posts: 15
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1998 528i no power to Secondary Air Pump
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MJ & JJ |
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Moderator
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It only comes on for a short while at startup. It has a relay and that is the next thing to check. You need a Bentley for the E39 or search the web for the relay location or try the main power distribution box and see if it is listed on the lid.
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HPDE Instructor (BMW / PCA / Apex) Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima Gone: 2001 330i Silver/Grey ~ 98 Camry V6 ~ 97 Camry I4 ~ 97 Mazda 626 I4 ~ 93 Sentra SE-R ~ 88 Toyota Truck I4 |
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Moderator
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Use this:
Electronic Shop Manual Go to the Automotive section then select your car then Wiring Diagrams.
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HPDE Instructor (BMW / PCA / Apex) Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima Gone: 2001 330i Silver/Grey ~ 98 Camry V6 ~ 97 Camry I4 ~ 97 Mazda 626 I4 ~ 93 Sentra SE-R ~ 88 Toyota Truck I4 |
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Registered User
Join Date: Jun 2004
Location: NJ
Posts: 15
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did some more checking over the weekend...
There is a valve/switch installed down stream of the scondary air pump. It is vacuum operated. I followed the vacuum line to a switch mounted between intake runners 1 & 2. I'm guessing that when the switch is activaed it lets vacuum pass through to the valve/switch downstream of the secondary air pump. The plug that goes into the switch did not have power when I checked it. Does anyone know when this switch is supposed to be activated? ( it may be called the Back Pressure Valve) And what activates it? We do have vacuum to the switch.
There was info on the switch: 7 22341.00 12V 98T145 1 742 712 Pierburg PA6 GF30 We are still trying to find out more about how this whole system works. We are also trying to identify which relay and/or fuse controls the secondary air pump. Any info would be appreciated however small it might be. Thanks!
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MJ & JJ Last edited by MJ & JJ; 03-05-2007 at 12:01 PM.. |
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Registered User
Join Date: Jan 2007
Location: west chester pa
Posts: 183
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the valve has nothing to do with the power to the pump. if no power, check the wires, if they are good, check the relay
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gONe |
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