Which is switched power pin on ECU? - Saab 9000 Bulletin Board - Saabnet.com
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Which is switched power pin on ECU?
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Posted by JerseySaab [Email] (#666) [Profile/Gallery] (more from JerseySaab) on Mon, 22 Jun 2015 17:11:59 Share Post by Email
In Reply to: Will '97 ECU work (for test) in '95 CSE?, JerseySaab [Profile/Gallery] , Mon, 22 Jun 2015 08:40:32
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I've been trying to figure out where to check for +12v switched power on the ECU and am finding conflicting information.

According to the Ari no-start checklist, this is fed from fuse #13. However, the 1997 wiring diagram doesn't even show fuse 13 in the section concerning the ECU ("Engine Performance Circuits.")

The quasimotors pinout shows pin 21 as +12v switched, but the 1997 diagram shows that pin as not being used. To add to the confusion, the Haynes manual has ECU pin 18 tagged as switched power. (On the 1997 diagram this goes to the ignition.) It looks like over the years the power feed pins were not kept consistent on the different ECUs.

So - anyone know for sure which pin or wire to check for the ECU's 12v feed on my '95 CSE? I figure if I can do some voltage checks that may help poinpoint the problem that is shutting down the ECU.

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