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Joined: Mon Oct 23rd, 2017
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I checked all wiring and jiggled everything while my wife was in the truck to see if the rear sensor wiring was messed up. IE: If it's a broken wire, me pulling/pushing the loom is bound to do something if it's a problem like that. I did that for 5 minutes and nothing changed in terms of ABS light coming on.
My truck already had the recall done. Though they had the older switch on there I just replaced the switch and harness with a new one maybe two weeks ago. I had the bed off when I was doing the fuel pump months ago but when I looked at everything nothing seemed out of the norm. When I changed diff covers I cleaned the inside of the diff with brake clean like I normally do and there was no metal/shavings/anything out of the norm at all. Put new diff cover and filled it up. The ONLY thing I did differently was since the bed was off I filled the diff up at the sensor hole on the top rather than the fill port. BUT I had the fill port open so when fluid started coming out of that I then closed it up. (It was just easier pouring it from the top than from the awkward sideport)... I changed the Raybestos sensor to the OEM one. Then slowly driving out of the driveway/street the ABS light came on.
Pulled into the driveway and checked and when I turned the truck on it was gone so I figured it was a fluke. Got the truck inspected and it was fine and then driving back after going over a speed hump it came back.
I will note that the ABS light came on today and it was from about a stop to a 2mph then stop again situation. Makes no sense. I pulled the code and it was the faulty brake switch listed above.
I checked all harnesses. I took the recall harness off, checked fuses, checked connectivity. and checked volts. All pass and no broken or frayed wires. Putting out 12v when the truck is on.
I did just bleed the master cylinder while I was there, it spit out some dirty fluid and maybe an air bubble or two..nothing major. I never bled the master cylinder before, always just at the front/rear brakes.
I would say the light does NOT come on when I brake at all. In fact I can hard brake, light brake..etc. Light will not come on. It's usually happening when I am fully stopped and or rolling slowly in a stop and go situation. But again, never had this problem and I was for many years in stop and go traffic morning/night so I would have noticed this happening. I don't want to say I did anything while working on the front of the truck but it's just odd. Really odd.
Just ran FORScan after I got home and shut the truck off/turned on and nothing pops up. Did the ABS test and that's successful with no DTCs...lol Of course.
This is odd, and annoying. I'd rather the light be on all the time honestly then it might be easier to diagnosis. I am going to bring my scanner with me tonight when I go out and have the wheel speed sensors running on it to see if everything is matching.
I know when I test the brakes and push the pedal it reads instantly on/off depending on if I am pushing or not, so I know the switch inside/obdII is reading it and registering the info.
-Nigel
Attachment: brake2.JPG (Downloaded 39 times)
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2001 XLT 2.3L
~NSG~