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Take a good look at fuse #6 and it's contacts... 200 1991

uid 18083's pic
posted by  lucid on  Wed Sep 22 09:47 CST 2010
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

...It carries the whole load for both the Ignition and FI systems.

Failure to get an OBD code from either system suggests no F6 power at the respective CUs.

The pushbutton OB light is a separate ground. The LED always has +12V on one side from the ignition switch. The pushbutton grounds the other side, which is what the ECUs are supposed to do to flash codes. But it seems they are both out to lunch.

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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