Fan Switch ... and ... ABS?

Justin, I'd start by checking your battery and PDC connections.

Good luck bud.

SeventyMach1 said:

May I ask why?

Click to expand...

Yes you may. I might not say why though.

Justin, I thought you might have had a borderline connection with your primary load wiring and the jolt of high speed (it is a decent one) illuminated the poor connection. The ABS light can come on if it loses accessory power or power dips below 10 volts. I thought these two things might tie together (it was the one commonality I could think of at first blush. It could very well be wrong but I figure it's so easy to check............ ).

Now if there's an actual ABS code, that could help us out here.

I was trying to think of what else a load (I might assume the fan or about any other large load could cause it - remember our fans can have a start-up surge of 75 amps +. This lasts for milliseconds) could disrupt those systems, and as long as the ground pathway is good (we assume yours to be - the car has a nice home), I wasnt coming up with much else.

Good luck Justin.

EDIT: regarding your edit, no worries Justin. I don't know what I was thinking when I read half my replies either. I also like to have some sort of clue where someone's head was when they reply to my threads. Helps with those ideas from left field.

Justin, I have heard of a few Optimas having issues lately (I dont know if it was red or blue - I'm only pretty sure that it was yellows). Maybe you just got a bad one.

I'm glad you got it figured out. Your problem was screaming load-side current issue to me when I read it initially. I didnt actually think it'd be your battery [itself] if the car had enough deep cycle to crank strongly however. You were wise with your diagnostics to not overlook anything.

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