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Username Post: ABS lite on after changing ABS sensor line        (Topic#358862)
djw1960 
Newbie
Posts: 35
djw1960
Reg: 09-10-14
11-18-19 02:43 PM - Post#2780445    

I found the wires for the ABS sensor line had the insulation was eroded from I guess brake fluid. So I ordered a new line and changed it out yesterday. After the change I took it for a ride to check to make sure it was working correctly. It did not pull either way so that was good, it had pulled a bit prior to the change. However, the ABS light is illuminated now. I pulled the codes and they show and issue with the sensor, which just changed, and it was new out of the wrapper. I rechecked the connection near the engine and it appeared to be good. I made sure that the connection at the wheel hub was good prior to putting the caliper and disc back on.

Any input would be great. I am thinking of just disconnecting the battery and touching the positive and negative cables for a minute to reset all of the computers hoping that would help to clear the light.

Thanks

2001 Chevy 2500 HD, with an LQ4




 
junkman104 
Frequent Contributor
Posts: 1438
junkman104
Age: 60
Loc: Murphy N.C.
Reg: 01-25-14
11-18-19 05:52 PM - Post#2780459    
    In response to djw1960

First thing I would do is pull the sensor back out and see if there is rust stuck to the magnet. Second did you transfer the shims from the original one?



 
djw1960 
Newbie
Posts: 35
djw1960
Reg: 09-10-14
11-19-19 12:07 PM - Post#2780523    
    In response to junkman104

I will pull it back out to look at it. No I did not transfer the shims to the new one. I will pull the old one out of garbage and do just that.

Thanks,



 
Shepherd 
Frequent Contributor
Posts: 1885

Loc: Lake George, NY
Reg: 11-11-15
11-19-19 12:58 PM - Post#2780531    
    In response to djw1960

As junkman said, common issue for the sensor mount area to get corroded then there is no ground, take it back out clean that spot down to metal, the system operates on very low output, so grounds are critical.



 
tommy49 
"5th Year" Silver Supporting Member
Posts: 2718
tommy49
Loc: Kaleva, Michigan
Reg: 09-28-12
11-20-19 06:12 AM - Post#2780585    
    In response to Shepherd

  • Shepherd Said:
As junkman said, common issue for the sensor mount area to get corroded then there is no ground, take it back out clean that spot down to metal, the system operates on very low output, so grounds are critical.



The sensors don't ground through the mounting bolts or it's housing. I would clean the chassis grounds on the left body mount brackets.


Tommy

49 Deluxe Sport Coupe, 4.8/4L60E swap in progress, Blazer rear axle, 4 wheel power disc brakes.

https://www.flickr.com/photos/tommyfortynine /album...




 
djw1960 
Newbie
Posts: 35
djw1960
Reg: 09-10-14
11-20-19 08:30 AM - Post#2780592    
    In response to tommy49

I cleaned the connections with electric connection cleaner, installed the shim and reinstalled the old one, but none of that cleared the ABS light. I disconnected the battery and held the two ends together for 30 seconds to reset everything but it is still there. I read all of the codes and had one for the front left ABS, the one I am working on, having an issue. I reinstalled the new one with the shim and got the same results.

At this point at a loss. I checked the connection on the frame to ensure the wires were good too.

Thanks for the info.




 
Shepherd 
Frequent Contributor
Posts: 1885

Loc: Lake George, NY
Reg: 11-11-15
11-20-19 02:45 PM - Post#2780616    
    In response to tommy49

Might disagree here, the GM recall for the sensor issue involved corrosion at the mounting surface for the sensor, part of that issue was lifting the sensor away from the tone wheel, so the out put was weak or none, the ground issue was secondary, so yes there are really separate problems at the same junction. Good point on your part



 
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