Re: more to this story - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: more to this story
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Posted by SWEDECAR [Email] (#112) [Profile/Gallery] (more from SWEDECAR) on Mon, 3 Jan 2011 08:36:51 Share Post by Email
In Reply to: Re: more to this story, AaronG, Mon, 3 Jan 2011 04:03:46
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All problems can be solved but you have to stop dilly dallying around and get a strategy going and make sure that what you are testing is done correctly.

So you are now sure that the fuel pump is running while cranking over and it is proven by having voltage at both fuse 32 and back at the pump? That means the fuel pump relay MUST receive power and ground in correct order.

That also means the main fuel injection relay MUST receive power and ground in correct order because otherwise, if the main relay didn't turn on, the fuel pump relay would not turn on either.

So, since we know that the main relay turns on properly and supplies fuel pump relay with power properly, it MUST also supply voltage to fuel injectors since it is the same feed to injectors as fuel pump relay, AS LONG AS it is not break in the wire from a wire split where power goes one way to fuel pump relay and a couple of wires to fuel injectors and ignition.

This can easily be tested by checking for power at fuse 16B and 26 while cranking over. If you have power at one of the fuses and not the other, you have a wire break between relay and fuse box.
I assume fuse 26 will have power since you have ignition and spark.

So test that.

Anders

SWEDECAR

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