ABS Code C1233 Missing Input Signal Left Front

[hillre55]

Good afternoon, I've a 2003 Ford Explorer, 4.0, 162,000 miles. I've an ABS code C1233. Thus far, i replaced the left front sensor. The ABS light is still on. Have any of you had this issue with your Explorer? If so, how did you fix it. All fuses are good. Could this be an issue with the left front wheel bearing and or an issue with the left front harness for the ABS sensor? Thanks..................have a good holiday weekend

 

[Fix4Dirt]

someone else had an issue like this recently. check the wiring from it to make sure its all in good conditioning, check the connection to the sensor, maybe clean it with electrical cleaner or soemthign of the like, and make sure it aint overly muddy would be where i would start. im not an expert, and i dont play one on TV, but i dont think the bearing itself would affect the sensor readings imo. iirc the solution to a recent similair issue was that it wasnt fully plugged in.

 

[LMHmedchem]

The ABS sensor helps to detect if the wheels are moving at the same speed. There is a tone ring inside the wheel hub and bearing assembly. This is just a ring with teeth in it like a gear but wider. The sensor is magnetic and reads the teeth of the tone ring passing by the magnetic end of the sensor. The spaces between the teeth are far enough away from the sensor that they read differently and this lets the computer measure the speed at which the hub is turning.

One of the failures involves the breakdown of metal parts inside the hub and bearing assembly. The breakdown results in metal shavings floating around inside the hub which tend to collect on the magnetic end of the sensor. Did you notice anything like that when you removed the old sensor to replace it? If so, you may want to pull the sensor end of the replacement and make sure that it has not become fouled with metal shavings. This is a pretty simple system, so if the sensor is clean and there is not a connection issue as Fix4Dirt suggests, it is hard to imagine what might be wrong at the hub to cause a failure. I think that the tone ring would have to be pretty badly damaged for it to not register with the sensor. The tone ring on the front wheels can't be replaced independent of the hub and bearing assembly since it is all factory pressed together.

If you used a quality part then I think that the likely issue would be wiring further up, meaning between the ABS sensor connection to the wire harness and the computer. Since you are not getting a code for the front right, you could switch the front sensors and see if the issue follows the new sensor or not. If it does, you might have replaced a bad sensor with a new bad sensor. Unfortunately it does happen sometimes.

Higher up wiring issues are a pain, so hopefully it's not.

LMHmedchem

 

[hillre55]

someone else had an issue like this recently. check the wiring from it to make sure its all in good conditioning, check the connection to the sensor, maybe clean it with electrical cleaner or soemthign of the like, and make sure it aint overly muddy would be where i would start. im not an expert, and i dont play one on TV, but i dont think the bearing itself would affect the sensor readings imo. iirc the solution to a recent similair issue was that it wasnt fully plugged in.

Thanks
I will check the wiring to confirm that there are no damage to it. Appreciate the feedback. I’ll will get to it sometimes this week. Thanks again

 

[hillre55]

The ABS sensor helps to detect if the wheels are moving at the same speed. There is a tone ring inside the wheel hub and bearing assembly. This is just a ring with teeth in it like a gear but wider. The sensor is magnetic and reads the teeth of the tone ring passing by the magnetic end of the sensor. The spaces between the teeth are far enough away from the sensor that they read differently and this lets the computer measure the speed at which the hub is turning.

One of the failures involves the breakdown of metal parts inside the hub and bearing assembly. The breakdown results in metal shavings floating around inside the hub which tend to collect on the magnetic end of the sensor. Did you notice anything like that when you removed the old sensor to replace it? If so, you may want to pull the sensor end of the replacement and make sure that it has not become fouled with metal shavings. This is a pretty simple system, so if the sensor is clean and there is not a connection issue as Fix4Dirt suggests, it is hard to imagine what might be wrong at the hub to cause a failure. I think that the tone ring would have to be pretty badly damaged for it to not register with the sensor. The tone ring on the front wheels can't be replaced independent of the hub and bearing assembly since it is all factory pressed together.

If you used a quality part then I think that the likely issue would be wiring further up, meaning between the ABS sensor connection to the wire harness and the computer. Since you are not getting a code for the front right, you could switch the front sensors and see if the issue follows the new sensor or not. If it does, you might have replaced a bad sensor with a new bad sensor. Unfortunately it does happen sometimes.

Higher up wiring issues are a pain, so hopefully it's not.

LMHmedchem

Thanks for the feedback. I didn’t see any metal shavings but I’ll double check to confirm. I’ll check the wiring harness as well for damages. I was wondering where the tone ring was located at. On YouTube I see that the ring on some Fords are visible on the outside of the CV axle. I wonder why they put this one inside the hub and bearing. I reckon it more secure that way). Thanks for the good info. Happy Memorial holiday to ALL