Re: Boost Control Valve Wiring - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Boost Control Valve Wiring
Posted by Dean [Email] (more from Dean) on Wed, 18 May 2005 08:02:16
In Reply to: Boost Control Valve Wiring, TimE, Tue, 17 May 2005 19:25:12
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pin 2 is black/green-stripe and is battery voltage, thicker wire (1.5)
pin 1 is blue and connects to pin 26 of the ECU (1.0)
pin 3 is green/black-stripe and connects to pin 2 of the ECU (1.0)
numbers in () are metric wire guage
above is from WIS
The ECU/ECM grounds pins 2&26 to control pressure. This is done by pulse width modulation. If the wires are reversed, the boost will do the opposite of what the ECU is trying to do. So if the system is working ok, then the wires must be correct in that orientation. You might also find the pin numbers on the BPV. Clean the wires and you might be able to better see the markings.
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