Re: New mystery - completely dead - Saab 900 Bulletin Board - Saabnet.com
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Re: New mystery - completely dead
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Posted by Cmyles [Email] (#1126) [Profile/Gallery] (more from Cmyles) on Sun, 23 Apr 2023 07:24:40 Share Post by Email
In Reply to: Re: New mystery - completely dead, ursusskandia [Profile/Gallery] , Sun, 23 Apr 2023 06:59:41
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Given your description it seems to me that you are overlooking the main relay. It's in series between the ECU and fuel pump relay so a bad main relay or bad connection between the two relays will kill the pump and the entire injection system. The main and fuel pump relays are identical and can even be swapped (but that won't help if one is bad) and the primary connection between them is by a brown and white wire that has a single pole connector midway so that on turbocharged cars the pressure switch can cut the fuel system during over-pressure conditions. In you NA car the brown/white wire's male and female connectors will just be connected without interruption. If they have become disconnected then the main relay can't energize the pump relay. EDIT: After 1990 the single pole connector was eliminated and the brown/whit wire is uninterrupted between the two relays. In either case you can probe that wire for 12 volts to see if the main relay is powering the pump relay.

->Posting last edited on Sun, 23 Apr 2023 07:36:53.

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