Jacket
Moderator
I've got the fairly well known issue of the ABS pulsing at low speeds just before the truck stops. I had the same issue a few years ago, and was able to diagnose a bad passenger front sensor and replaced it. This time around though, I'm not getting an ABS light indicator and related fault codes. I jumped the pins (E1 and Tc) just in case to check for faults, but it comes back with what I assume is normal (no specific fault codes via the blinking ABS light). So I don't have any evidence from the diagnostics that one of the sensors is failing.
I recently rebuilt the front axle and replaced rotors, pads, calipers. Obviously this involves pulling the front ABS sensors, but they looked fine and were cleaned before reinstalling. There was no issue for the first couple weeks after I was back on the road, but then the ABS pulsing started out of the blue.
Here's what I've checked:
- diagnosis plug check of ABS system didn't return any sensor failure codes (per above). The ABS light flashed steadily, and the cruise and another light flashed as well. But the FSM is pretty clear on the fault code flashing pulses with the ABS light, and I'm not seeing it.
And so here's what else I've done.
- Removed and cleaned the front sensors a couple more times. Nothing but grease on the ends, but cleaned anyway. Double-checked to make sure the sensors are seating properly.
- Removed and cleaned the rear sensors. I did notice the pass rear sensor had some damage of unknown origin (1st time these have been removed). The plastic tip was damaged (like it was scraped away), and the magnet slightly scraped. But it was clean and the magnet still functional. I'm thinking I'm due for a rear axle service given the damage.
- Pulled the end caps off the front axles to ensure that the c-clip was still in place. So there shouldn't be any irregular movement of the axle/birf.
Any other thoughts on what to check next? I could go ahead and replace the damaged sensor in the rear, but I would expect the diagnostics to indicate a failure with that sensor, so I'm not sure that's the problem.
I haven't unplugged the battery to reset the system, but I think that would only erase any fault codes, but it should do anything to the sensors themselves right?
Ideas welcome.
I recently rebuilt the front axle and replaced rotors, pads, calipers. Obviously this involves pulling the front ABS sensors, but they looked fine and were cleaned before reinstalling. There was no issue for the first couple weeks after I was back on the road, but then the ABS pulsing started out of the blue.
Here's what I've checked:
- diagnosis plug check of ABS system didn't return any sensor failure codes (per above). The ABS light flashed steadily, and the cruise and another light flashed as well. But the FSM is pretty clear on the fault code flashing pulses with the ABS light, and I'm not seeing it.
And so here's what else I've done.
- Removed and cleaned the front sensors a couple more times. Nothing but grease on the ends, but cleaned anyway. Double-checked to make sure the sensors are seating properly.
- Removed and cleaned the rear sensors. I did notice the pass rear sensor had some damage of unknown origin (1st time these have been removed). The plastic tip was damaged (like it was scraped away), and the magnet slightly scraped. But it was clean and the magnet still functional. I'm thinking I'm due for a rear axle service given the damage.
- Pulled the end caps off the front axles to ensure that the c-clip was still in place. So there shouldn't be any irregular movement of the axle/birf.
Any other thoughts on what to check next? I could go ahead and replace the damaged sensor in the rear, but I would expect the diagnostics to indicate a failure with that sensor, so I'm not sure that's the problem.
I haven't unplugged the battery to reset the system, but I think that would only erase any fault codes, but it should do anything to the sensors themselves right?
Ideas welcome.
