vsc abs vsc trac and skid lights

[kraftwerkauto]

OK I have been looking through the threads for over 2 weeks and so far what I have seen isn't a fix for my problem, so I have these light on for awhile then they go off and sometimes when the go off my brakes grab real hard, thought that was a caliper hung up, replaced the caliper and the brakes still grab hard, but not all the time, I have checked the wires to the abs sensors, replaced the brake light switch and still can not figure this out, this is my last hope before taking it to the stealership and having them check it out,,,,, HELP PLEASE

 

[BlackWorksInc]

Please don't take this the wrong way, but you've wasted your time and money at this point doing a half-arsed attempt at repairing your vehicle. What I mean by that is that you have DTCs (Diagnostic Trouble Codes) stored in the vehicle's memory (in the Skid Control ECU to be exact) which will assist you in diagnosing what the issue is and what steps need to be taken to correct the issue. Instead of properly diagnosing the vehicle and determining the fault area you have jumped straight to "Shotgun Diagnostics" which is shorthard for throwing parts at a vehicle and hoping it fixes it without knowing what is wrong with it (unfortunately not an uncommon method in the industry.)

What you need to do now (which is where you will want to start next time) is to have a shop pull the DTCs from the Skid Control ECU. The problem is most generic OBDII scantools don't communicate with the ABS system, so you need either a shop that has a tool that can do this or to go to the dealership and pay for diagnostics. Once you have the DTCs, you can better understand what part of the ABS/VSC/TRAC system is having an issue and isolate your testing to that section to narrow down potentional causes. At this point you're just flying blind and throwing money down the drain with no goal.

I would recommend that you look through these threads to get a better idea on how to approach repairing your vehicle in the future:
http://www.toyota-4runner.org/4th-gen-t4rs/151487-check-engine-trac-vsc-read-me.html
http://www.toyota-4runner.org/4th-gen-t4rs/132953-toolbox-how-use.html

When you get the DTCs post them in your thread and I or other members can help you narrow down what the issues are, until then we really do much but make wild speculations.
Al

 

[kraftwerkauto]

Hello

thanks, I dropped it off at Firestone this morning, I will post the codes when I get them

Please don't take this the wrong way, but you've wasted your time and money at this point doing a half-arsed attempt at repairing your vehicle. What I mean by that is that you have DTCs (Diagnostic Trouble Codes) stored in the vehicle's memory (in the Skid Control ECU to be exact) which will assist you in diagnosing what the issue is and what steps need to be taken to correct the issue. Instead of properly diagnosing the vehicle and determining the fault area you have jumped straight to "Shotgun Diagnostics" which is shorthard for throwing parts at a vehicle and hoping it fixes it without knowing what is wrong with it (unfortunately not an uncommon method in the industry.)

What you need to do now (which is where you will want to start next time) is to have a shop pull the DTCs from the Skid Control ECU. The problem is most generic OBDII scantools don't communicate with the ABS system, so you need either a shop that has a tool that can do this or to go to the dealership and pay for diagnostics. Once you have the DTCs, you can better understand what part of the ABS/VSC/TRAC system is having an issue and isolate your testing to that section to narrow down potentional causes. At this point you're just flying blind and throwing money down the drain with no goal.

I would recommend that you look through these threads to get a better idea on how to approach repairing your vehicle in the future:
http://www.toyota-4runner.org/4th-gen-t4rs/151487-check-engine-trac-vsc-read-me.html
http://www.toyota-4runner.org/4th-gen-t4rs/132953-toolbox-how-use.html

When you get the DTCs post them in your thread and I or other members can help you narrow down what the issues are, until then we really do much but make wild speculations.
Al

 

[kraftwerkauto]

front left wheel bearing and front left ABS sensor, I will be replacing these asap and will update this

Please don't take this the wrong way, but you've wasted your time and money at this point doing a half-arsed attempt at repairing your vehicle. What I mean by that is that you have DTCs (Diagnostic Trouble Codes) stored in the vehicle's memory (in the Skid Control ECU to be exact) which will assist you in diagnosing what the issue is and what steps need to be taken to correct the issue. Instead of properly diagnosing the vehicle and determining the fault area you have jumped straight to "Shotgun Diagnostics" which is shorthard for throwing parts at a vehicle and hoping it fixes it without knowing what is wrong with it (unfortunately not an uncommon method in the industry.)

What you need to do now (which is where you will want to start next time) is to have a shop pull the DTCs from the Skid Control ECU. The problem is most generic OBDII scantools don't communicate with the ABS system, so you need either a shop that has a tool that can do this or to go to the dealership and pay for diagnostics. Once you have the DTCs, you can better understand what part of the ABS/VSC/TRAC system is having an issue and isolate your testing to that section to narrow down potentional causes. At this point you're just flying blind and throwing money down the drain with no goal.

I would recommend that you look through these threads to get a better idea on how to approach repairing your vehicle in the future:
http://www.toyota-4runner.org/4th-gen-t4rs/151487-check-engine-trac-vsc-read-me.html
http://www.toyota-4runner.org/4th-gen-t4rs/132953-toolbox-how-use.html

When you get the DTCs post them in your thread and I or other members can help you narrow down what the issues are, until then we really do much but make wild speculations.
Al

 

[kirbyyyyy]

For the ABS sensor, check continuity to the sensor first. It might be something as simple as just re-wiring the sensor to the harness (as was mine) saved me a couple hundred dollars instead of having to buy a new sensor/harness.

 

[kraftwerkauto]

It was just the left front wheel bearing, replaced and cleaned the abs sensor, every thing works like it should, light are all off, thanks

 

[beliy25]

i have those light come one at least once a day ususally on highway speeds,55+,after i shut the car off and star it again they disappear.there is no difference in braking ,accelerating,when lights are on and off.is it possible that its the same or similar problem with bearing or sensor or something else?

 

[BlackWorksInc]

i have those light come one at least once a day ususally on highway speeds,55+,after i shut the car off and star it again they disappear.there is no difference in braking ,accelerating,when lights are on and off.is it possible that its the same or similar problem with bearing or sensor or something else?

Very possible, it doesn't seem to be a circuit issue in terms of a short to ground otherwise the DTC would be there on start-up. It could be an issue with the Wheel Speed Sensor wiring, sensor, ect.

 

[beliy25]

Very possible, it doesn't seem to be a circuit issue in terms of a short to ground otherwise the DTC would be there on start-up. It could be an issue with the Wheel Speed Sensor wiring, sensor, ect.

where to start?how to check?what to do?please suggest!!

 

[kraftwerkauto]

The best thing to do is take it to a mechanic and have them hook it up to the diagnostic computer, then you will know for sure instead of guessing

 

[beliy25]

The best thing to do is take it to a mechanic and have them hook it up to the diagnostic computer, then you will know for sure instead of guessing

if i wouldnt do so i would not be here asking what to do.

when my car was under warranty couple month ago it was hooked up to the computer at a dealership and i was told by the mechanic that there are no codes coming up.

two options,the mechanic has no knowledge of whats up(which i doubt,or he wouldnt work at dealership,but everything is possible)or the computer is mistaking or being wrong!!!

i still have this problem and i belive only only people who had the same problem will know what to do with it.

the same as with rear window washer and defroster.(i was told at dealership that my motor died for rear defroster and washer,the issu was that the window was slightly bit opened ,which was the reason it wasnt working.i read the info from this exact forum and thats why i am i love with the forum and knowledge of the owners of this vehicle.


the problem is not solved anyway so if anyone know the solution to it,please help me resolve it.

thank you all.
Ilya

 

[BlackWorksInc]

[MENTION=78378]beliy25[/MENTION]

It sounds like you have an issue with a sensor/circuit that is NOT a short to power or ground. If it was the DTC would be set immediately when you turned the key. This sounds like possibly a wheel speed sensor is either not responding, the wire is cut/broken, and/or there is too much resistance in the line causing signal issues. Regardless of the cause; the issue is a bit trickier to pin down because it only seems to occur at speeds above 55mph.

Though the DTC is erased when you cycle the key, it will set again when the proper criteria is met again. Usually a "History" DTC is recorded, but not always, so it is possible the technician did not see what the issue was because at the time the DTC was not stored.

What you need to do is have someone with an ABS compliant scantool check the vehicle when the DTC is set (the lights are on) and/or test drive the vehicle until the DTC sets and then check it for codes. If it is as consistent as you say it is, it should only be a matter of driving it to 55mph and then checking it when the lights are on.

Without the DTCs we're only able to narrow the issue down to a possible issue in the following areas:

-Skid Control ECU
-Wiring Harness
-One or more of the 4 ABS Wheel Speed Sensors and/or any other sensors that are affected by speed.

 

[beliy25]

[MENTION=78378]beliy25[/MENTION]

It sounds like you have an issue with a sensor/circuit that is NOT a short to power or ground. If it was the DTC would be set immediately when you turned the key. This sounds like possibly a wheel speed sensor is either not responding, the wire is cut/broken, and/or there is too much resistance in the line causing signal issues. Regardless of the cause; the issue is a bit trickier to pin down because it only seems to occur at speeds above 55mph.

Though the DTC is erased when you cycle the key, it will set again when the proper criteria is met again. Usually a "History" DTC is recorded, but not always, so it is possible the technician did not see what the issue was because at the time the DTC was not stored.

What you need to do is have someone with an ABS compliant scantool check the vehicle when the DTC is set (the lights are on) and/or test drive the vehicle until the DTC sets and then check it for codes. If it is as consistent as you say it is, it should only be a matter of driving it to 55mph and then checking it when the lights are on.

Without the DTCs we're only able to narrow the issue down to a possible issue in the following areas:

-Skid Control ECU
-Wiring Harness
-One or more of the 4 ABS Wheel Speed Sensors and/or any other sensors that are affected by speed.

thank you very much.i ask my mechanic friends about the ABS compliant tool and go from there.thanks again

Ilya

 

[ebg18t]

[MENTION=78378]beliy25[/MENTION] - ask if anyone by you has a TIS TechStream Toyota Specefic computer. When I was trouble shooting my ABS issues I found the generic ones with ABS compatibility were not able to show me everything I needed when trying to figure out the ABS situation.

 

[beliy25]

[MENTION=78378]beliy25[/MENTION] - ask if anyone by you has a TIS TechStream Toyota Specefic computer. When I was trouble shooting my ABS issues I found the generic ones with ABS compatibility were not able to show me everything I needed when trying to figure out the ABS situation.

got you.i doubt anyone near me has it or if they do they ll charge a lot for it but ill try .
thank you very much for advices !!!!

Ilya