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Ed,
Please give me a page reference in your Haynes, so I can see what diagram you are looking at. Maybe I can find what's tripping you up.
You've already discovered what I was saving for my next salvo — the fact that fuse 6 has power in, but none out.
But your '90 FI and Ignition systems are fused — by the 25 amp blade fuse near the coil. In 91, as I said, that 25 amp fuse was done away with, and replaced in the circuits by good old #6 (upped to 16 amp I think).
I wish you'd dump the Haynes for a Bentley manual. It's been offered for as low as $30 by eeuroparts, where going over $39 with a few parts and the shipping is free.
I've been dabbling with 240s since 1990. I do have a Haynes from that period (and a later one) but they are virtually untouched compared to my dog-eared Bentley.
Try finding the "On Board Diagnostics" info in your 1976 thru 1993 Haynes. It sure raised my blood pressure earlier today. As you know there are OBD codes for both Fuel Injection and Ignition (Hint: Don't bother looking in either of those chapters.) And when you do find it, there will be nothing on the Mode 2 and Mode 3 capabilities. For Haynes, they don't exist. Nor for you either, if Haynes is your only reference.
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Bruce Young '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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