ABS Brake Issue 2003 Yukong Denali XL
#11
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Makes sense to me, except why the sudden engagement of the left front under load. It is totally unsafe, so the system isn't functioning correctly.
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Interesting that you bring up the Stability Control System issue. I have seen the error light come on during the episode with the perceived ABS issue, however, none of the diagnostics have come up with a error code for it. Possibly because intermittent nature of the problem. I have seen the light come on in the dash periodically.
That said, my most recent venture to the auto electrical genius, left me with a recommended replacement of the Steering wheel clock spring. The tech believes that that is the cause of another new issue, a Driver'* Side airbag sensor error. Which coincidentally occurred after replacing the driver'* seat form and covering. I was warned about this happening and that it is likely due to a bad seat connector. I have since removed the seat and checked all the connectors, cleaned them and reconnected them and nothing. The auto electric tech said it the steering clock spring.
The seat sensors go out all the time. I believe it is not a connector, and it is the sensor itself.
Overall, from what I can gather, diagnostics is turning into a lost art, especially at the dealerships. If the code(*) and manuals don't give an answer, many technicians are left guessing instead of thinking things through based on how parts work and interact.
Boilerplate: I am not saying all of them or anything like that, but an increasing proportion of them.
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TommyB (02-05-2023)
#13
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regarding the Stability control system vs the ABS system. It totally makes sense to me, regarding engagement of the left front only while under load, especially while on a decreasing radius turn, either while accelerating or decelerating. So, the next step is? Wondering why the Stability Control System wouldn't create an error code? I am at a loss, and I greatly appreciate your time and input.
If it were mine, I'd temporarily disconnect the steering wheel position sensor. This will cause the Stability system to go into an error condition but leave the ABS working. Now try the same conditions and see if the symptom is gone. If it is, then voila' you've probably found the problem.
Then replace the steering wheel position sensor, normal everything, and see what happens.
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carfixer007 (01-29-2023)
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Then it applies some left brake to attempt to control the right yaw.
Then you straighten out the steering.
Then it says "good job, me, I see the steering wheel is at the straight position, and both front wheels are turning at the same speed. I get to avoid the junkyard a little longer! Woohoo!"
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Thanks, I am going to tr disconnecting the steering wheel position sensor and give it a go. I really appreciate your sharing your thoughts and expertise. I agree that the mechanics of old with real diagnostic ability are going the way of the dinosaurs. Sadly, it run a quick code check and replace. No time to actually engage the brain module. Too expensive for the auto shop or dealer. Besides, just about any average idiot with a OBD scanner or better, and a box of decent tools, can replace parts. Sad to say. I will check back in after I have had time to try out this strategy. I also have to work on the other main issue I posted about and that is all over the car sites. That is my truck going into reduced power mode. You probably have seen my other post. Had the Throttle body replaced 3x'*, the TPS replaced, the fuel filter 3x'*, the fuel pump, The cable harness to the Throttle body replaced. My truck will shut down suddenly while driving, I pull to the side of the road dodging cars. Shut it down and 90% of the time, turn the ignition back on pump the accelerator pedal 5x'* fully to reset the computer oil life etc. and the truck will restart normally. It is a random occurrence but is happening more frequently now and is dangerous. I have read tons about the issue and it seems quite common. From Throttle body, to wiring to ground shorts, etc, etc, etc...
#16
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I also have to work on the other main issue I posted about and that is all over the car sites. That is my truck going into reduced power mode. You probably have seen my other post. Had the Throttle body replaced 3x'*, the TPS replaced, the fuel filter 3x'*, the fuel pump, The cable harness to the Throttle body replaced. My truck will shut down suddenly while driving, I pull to the side of the road dodging cars. Shut it down and 90% of the time, turn the ignition back on pump the accelerator pedal 5x'* fully to reset the computer oil life etc. and the truck will restart normally. It is a random occurrence but is happening more frequently now and is dangerous. I have read tons about the issue and it seems quite common. From Throttle body, to wiring to ground shorts, etc, etc, etc...
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