Re: New Jettronic still no start - Saab 900 Bulletin Board - Saabnet.com
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Re: New Jettronic still no start
Posted by Bill S. [Email] (more from Bill S.) on Mon, 14 Jan 2013 19:55:00
In Reply to: New Jettronic still no start, derek900, Mon, 14 Jan 2013 16:18:43
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Did you check out the fuel injection main relay that's down by the LH controller? That relay should get a continuous 12v straight from the battery on pins 30 and 86, and is grounded by the LH controller on pin 85 to energize it. That relay provides control-side power to the fuel pump relay, and if its not working the fuel pump relay can't energize and run the pump.
Once the fuel pump relay is powered by the fuel injection main relay, then the LH controller provides a ground for the fuel pump relay to energize it, and send power to the pump.
If jumping pins 30 and 87b at the fuel pump relay makes your pump run, the problem is likely to be one of those two relays, the LH controller (which seems less likely since you've tried two), or wiring.
posted by 166.137.21...
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