2000 F-150 ABS light but no code
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2000 F-150 ABS light but no code
2000 F-150 Triton V-8, Super Cab, 2WD, ~170,000 miles, 4-wheel ABS (one speed sensor on each front wheel and one on the rear differential)
The ABS light comes on a few minutes after driving. It seems to take a little bit longer for the light to come on when the weather is colder.
I used a Cen-Tech 60794 OBD II/CAN with ABS scan tool with key on, engine off, and the below sequence. No codes were detected. I then left the scanner connected but powered off and drove around until the ABS light came on. Pulled into a parking lot with engine running, powered up the scan tool and went through the following menu choices:
Diagnostics
ABS
Area - USA vehicles
Model - Ford
Although the tool's instruction manual has several more items that may or may not be required (VIN digits, model year, etc), the next thing I saw is a message indicating the scanner is linking with the vehicle computer. During that time the ABS light went out.
Next on the scan tool display my choice was to read codes or erase codes. I selected "Read codes" and the display said there are no codes in the module.
Any advice?
The ABS light comes on a few minutes after driving. It seems to take a little bit longer for the light to come on when the weather is colder.
I used a Cen-Tech 60794 OBD II/CAN with ABS scan tool with key on, engine off, and the below sequence. No codes were detected. I then left the scanner connected but powered off and drove around until the ABS light came on. Pulled into a parking lot with engine running, powered up the scan tool and went through the following menu choices:
Diagnostics
ABS
Area - USA vehicles
Model - Ford
Although the tool's instruction manual has several more items that may or may not be required (VIN digits, model year, etc), the next thing I saw is a message indicating the scanner is linking with the vehicle computer. During that time the ABS light went out.
Next on the scan tool display my choice was to read codes or erase codes. I selected "Read codes" and the display said there are no codes in the module.
Any advice?
Hotshot
Joined: Jul 2005
Posts: 11,931
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I would guess the rear sensor in the pumpkin ( axle housing) is dirty or weak. You can take out one small bolt and pull it out and look.. Clean the crap off the end. If you have not changed the gear lube in the axle in a few years, you might want to do that. If you continue to have problems, change out that sensor.... Good bet it is the rear.
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Thanks. I had some other work I needed done, so I had a mechanic go ahead and replace the rear sensor for me. The light is still on.
Haven't replaced the axle grease yet, but do you have any other suggestions?
Haven't replaced the axle grease yet, but do you have any other suggestions?
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
when you turn the key on, the light comes on. When the truck starts the ABS runs a continuity type test to see all 3 sensors. If everything is connected, the light goes out. When you put the truck in gear and start moving, the ABS checks to see that each sensor has an output ( to measure RPM). Once you hit 5 MPH, the light comes back on if the output is not seen....... If the light comes on after several miles down the road, then you have a sensor that is erratic output, or weak output. There are only 3 sensors, and 90% of the time it is the rear sensor. Thick old dirty lube will get on the sensor and cause it to have problems, and normally you get crud or steel powder on the sensor.......... ask the mechanic what he saw when he changed it... the front is a possibility, but not as common.
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Jim40216
1987 - 1996 F150 & Larger F-Series Trucks
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Aug 16, 2019 01:38 PM
