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I helped make ur rimz....
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619 Posts
Discussion Starter #1
my 97 f-250's abs light came on the other day while i was hauling some metal to the scrap yard. It went away for two days and now its back, it flashes like crazy, but whenever i first start it up and either leave it in park or put it in reverse, it does not come on. Also since this started flashing, every time i put cruise control on, its ok, but getting it to turn off is a pain. Neither the buttons nor pressing the brakes will turn it off, i had to turn off the truck while i was driving to get it to slow down/ stop.When i started the truck back up and took off down the road, with cruise control off, the vehicle will stop like it should, but that ( demonic) ABS light will keep on flashing. Any ideas or suggestions ( truck is going into the shop for a diagnostic evaluation in a week or so, whenever i can get the time off.) for the time being as what this could be? I'm not going to be driving it until i can take it to the shop. thanks.
 

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Hardcore Redneck
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221 Posts
make sure your fluid is clean and that the float in the reservior is not sticking. if that dosent work look behind the glove box for the black and orange wire. unhook the connector, ground the BL/O wire and turn you key on. you should get a code from the abs light by counting the flashes. i recently had to do this on mine, for the same issue. cant remember the code, but i borrowed a manual from a buddy at the ford place and ran the pinpoint test. my problem was the dirty fluid making the sensor go crazy.
 

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Demon Dually
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5,140 Posts
Your clockspring behind the steering wheel is bad. That is why you can turn cruise control on and not off. It sounds like only part of the cable in the clockspring is broken so far and that is why part of it works. Try your horn and see if it works as well. Easy to replace just make sure the wheels are straight ahead when you install it.
 

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I helped make ur rimz....
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619 Posts
Discussion Starter #6
thanks y'all, i dont know what the abs code means but the light flashes 16 times and on the last time it stays solidly lit for about 2-3 seconds before it goes nuts again. speedometer does not bounce, and the horn does work. i'm hoping it will be an easy, time friendly and cheap fix, considering the day before all this happened i got my dually up and running right.
 

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thanks y'all, i dont know what the abs code means but the light flashes 16 times and on the last time it stays solidly lit for about 2-3 seconds before it goes nuts again. speedometer does not bounce, and the horn does work. i'm hoping it will be an easy, time friendly and cheap fix, considering the day before all this happened i got my dually up and running right.
Im havin' the same 16 flashes....did you find a resolution???
 

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Your ABS system is in diagnostic mode for some reason. It flashes a series of short lights followed by the last one being longer. The flash sequence of 15 short flashes and 1 long means that there are no errors stored and the ABS system is believed to be functioning normally. Check fuse #13 under the hood. I'll see if I can find you the ABS diagnostic stuff.
 

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Here's some info I was given elsewhere:

Abs Warning Light

On vehicles equipped with antilock brakes (ABS), a second warning light is provided to warn if a problem occurs within the ABS system. The ABS lamp comes on when the ignition is turned on for a bulb check, then goes out after the engine starts. If the ABS warning light remains on or comes on while driving, it indicates a fault has occurred in the ABS system.

What happens next depends on the nature of the fault. On most applications, the ABS system disables itself if the ABS warning light comes on and remains on. This should have no effect on normal braking. Even so, ABS will NOT be available in an emergency situation or when braking on a wet or slick surface.

CAUTION: If the brake warning light also comes on and remains on while the ABS warning light it on, it signals a serious problem. Your vehicle may not be safe to drive. The brakes and ABS system should be inspected immediately to determine the nature of the problem!

If the ABS light comes on momentarily then goes out, the nature of the problem is usually minor and the ABS system usually remains fully operational. Some vehicle manufacturers call this kind of fault a "nonlatching" fault (meaning it isn't serious enough to disable the ABS system).

Regardless of the type of fault that occurred to trigger the ABS warning lamp, a special "code" is recorded in the ABS module's memory to aid in diagnosing the problem. On some vehicles this code can be retrieved by putting the ABS system into a special diagnostic mode. The code is then flashed out through the ABS warning lamp. The code number refers to a diagnostic chart in a service manual that must be followed to pinpoint the faulty component. On other applications, a special "scan tool" must be plugged into the vehicle's diagnostic connector to read out the fault code.


Here's how to do the test

On-Board Diagnostics

Diagnostic Trouble Codes, Retrieving

CAUTION: Care must be taken to connect only the black/orange stripe wire to ground. Connecting the red mating connector wire to ground will result in a blown fuse.

Verify the key is in the RUN position (engine does not need to be running). Next, locate the black RABS II diagnostic connector. The diagnostic connector has two mating halves (one of which has a black/orange wire connected to it). Disconnect the two halves.

Attach one end of a jumper wire to the black with orange stripe wire side of the diagnostic connector. Momentarily ground the other end of the jumper wire by connecting it to a good chassis ground for 1-2 seconds. Grounding this wire should start the yellow REAR ABS warning light flashing. If grounding this wire does not start the yellow REAR ABS warning light flashing, go to the Symptom Chart.

The code consists of a number of short flashes and ends with a long flash. Count the short flashes and include the following long flash in the count to obtain the code number. For example, three short flashes followed by one long flash indicates diagnostic trouble Code 4. The code will continue to repeat itself until the key is turned off. It is recommended that the code be verified by reading it several times. This code will be used later for system repair instructions. It should be written down for future use. Diagnostic trouble code 16 indicates that the anti-lock electronic control module detects normal system operation.

Diagnostic Trouble Codes, Erasing

The last step of the System Pre-Check always includes clearing the Keep-Alive Memory (KAM). To do this, simply turn off the ignition while the diagnostic connector halves are separated as described in the procedures for obtaining the diagnostic trouble code above, after which the diagnostic connector should be reassembled to provide KAM power to the anti-lock electronic control module. If at this time a valid code has been obtained, go to the appropriate pinpoint test for that code.


The list to interpret the blinks in in the shop manual here
 
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