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ABS Wahala - Car Talk - Nairaland

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ABS Wahala by Whynow(m): 7:34am On Mar 31, 2019
I have my ABS light illuminated on my 07 lexus rx350
Scanned and its C0205, C1223 and c1236 which points to Front LH sensor ie driver side.
Bought a new sensor from amazon and replaced, same code.
Swapped RH sensor with LH . Same code on front LH. Meaning its not a sensor issue.
Now plugged in a scanner and checked live data while driving.
1. All four sensors are working or reading, but observed the front LH drops to zero quickly and rises ,while others remained constant.
Its intermittent and not consistent.


No foreign object is impeding sensor tip, sensors working, ring tone relucter okay.

It might be a wiring issue from the connector harness to abs module, but not sure


We now observed graph pattern, the Front LH shows a weird pattern , rough and other three are smooth patterns.

We went further to check reluctor ring in the outer CV, it is still very okay, no breakage , clean.

Now what do you guys think is the problem?
Right now i am confused.

Re: ABS Wahala by Whynow(m): 8:14am On Mar 31, 2019
Re: ABS Wahala by AutoElectNG: 8:16am On Mar 31, 2019
Whynow:
I have my ABS light illuminated on my 07 lexus rx350
Scanned and its C0205, C1223 and c1236 which points to Front LH sensor ie driver side.
Bought a new sensor from amazon and replaced, same code.
Swapped RH sensor with LH . Same code on front LH. Meaning its not a sensor issue.
Now plugged in a scanner and checked live data while driving.
1. All four sensors are working or reading, but observed the front LH drops to zero quickly and rises ,while others remained constant.
Its intermittent and not consistent.

We now observed graph pattern, the Front LH shows a weird pattern , rough and other three are smooth patterns.

We went further to check reluctor ring in the outer CV, it is still very okay, no breakage , clean.

Now what do you guys think is the problem?
Right now i am confused.



Inspect wiring for shorts or intermittent opens

Ensure that resistance is within specifications

Seems you have run a test using an oscilloscope

Worst case scenario, you may need to replace the ABS module

Instructive related example, not your vehicle, but why you need to run thorough resistance checks before you think of ABS module replacement

https://www.ericthecarguy.com/kunena/8-Service-and-Repair-Questions-Answered-Here/58049-2003-lexus-ls430-wheel-speed-sensor
Re: ABS Wahala by AutoElectNG: 8:38am On Mar 31, 2019
Re: ABS Wahala by aninweze(m): 11:38am On Mar 31, 2019
AutoElectNG:


Inspect wiring for shorts or intermittent opens

Ensure that resistance is within specifications

Seems you have run a test using an oscilloscope

Worst case scenario, you may need to replace the ABS module

Instructive related example, not your vehicle, but why you need to run thorough resistance checks before you think of ABS module replacement

https://www.ericthecarguy.com/kunena/8-Service-and-Repair-Questions-Answered-Here/58049-2003-lexus-ls430-wheel-speed-sensor

HE'S BACK!!!!!

I appreciate your contribution.
Re: ABS Wahala by AutoElectNG: 12:05pm On Mar 31, 2019
The idea behind the scope is to compare readings between both front wheels, if they aren't identical, there is a problem

It seems very likely the problem is electrical, did you or someone else work in that area?

Troubleshooting is identical for both sides though left DTC is C0205 and right is C0200.

Assuming my hunch is right, before you splurge on an ABS module or ECU, read this

https://www.clublexus.com/forums/gs-2nd-gen-1998-2005/241971-broke-your-abs-vsc-sensor-here-s-how-to-fix-it-3.html

I'd love some feedback.

Thanks for the feedback immediately above.

This guy autologic has an oscilloscope and knows how to use it by the way, and he is in Lagos, maybe you too should meetup
Re: ABS Wahala by Whynow(m): 2:52pm On Mar 31, 2019
Thanks AutoElectNG.
The problem started after transmission was replaced. I believe most of the work was performed from driver side.

My personal mechanic whom i paid to supervise the project as the work was performed at the transmission shop said he made sure everything was put back the same way, but one can never vouch for these guys.

Maybe force has been applied on the harness.
Yesterday i tried to visually inspect the harness connector from the top fender but it looks good.

Now its VSC ABS illuminated. The same codes and procedure as i explained above.
Re: ABS Wahala by Whynow(m): 2:54pm On Mar 31, 2019
Pls how can i contact Autologic ? Phone
Re: ABS Wahala by AutoElectNG: 2:55pm On Mar 31, 2019
Whynow:
The problem started after transmission was replaced. I believe most of the work was performed from driver side.

My personal mechanic whom i paid to supervise the project as the work was performed at the transmission shop said he made sure everything was put back the same way, but one can never vouch for these guys.

Maybe force has been applied on the harness.
Yesterday i tried to visually inspect the harness connector from the top fender but it looks good.

Now its VSC ABS illuminated. The same codes and procedure as i explained above.

The wire was stretched inadvertently... From the above explanation, do you have a multimeter?

Replacing the harness between the sensor and receptor of the sensors signals may be the solution you are seeking or failing that, repairing the harness
Re: ABS Wahala by Whynow(m): 3:10pm On Mar 31, 2019
Mine is analogue, but damaged.
Mine car's instrument cluster is always without code lights, not even check engine.
Its driving me nuts cry
Re: ABS Wahala by AutoElectNG: 3:11pm On Mar 31, 2019
Whynow:
Mine is analogue, but damaged.

Don't use analogy multimeters' with modern cars.

It has to be digital
Re: ABS Wahala by autologic: 3:51pm On Mar 31, 2019
Whynow:
Pls how can i contact Autologic ? Phone
Call 08061166316
Re: ABS Wahala by Whynow(m): 3:52pm On Mar 31, 2019
autologic:

Call 08061166316

Thank you
Re: ABS Wahala by obekediamondfuto(m): 10:51pm On Mar 31, 2019
Whynow:
Mine is analogue, but damaged.
Mine car's instrument cluster is always without code lights, not even check engine.
Its driving me nuts cry


u need to probe with a digital instrument..... when it comes to abs issues, precision is key.
Re: ABS Wahala by Whynow(m): 5:41pm On Apr 01, 2019
Autologic sent me a video of the issue.
Attached is the screenshot.
Observe gap on the 2nd shaft reluctor , reason for intermittent reading

Re: ABS Wahala by Whynow(m): 6:07pm On Apr 01, 2019
Update..
The shaft and ring realigned and he took for test drive.
Sensor is reading as it should ... cool
Thank you Autologic.

Though we haven't met, but your communication was 100% on point.

Re: ABS Wahala by Whynow(m): 6:09pm On Apr 01, 2019
Whynow:
Update..
The shaft and ring realigned and he took for test drive.
Sensor is reading as it should ... cool
Thank you Autologic.

Though we haven't met, but your communication was 100% on point.
Re: ABS Wahala by AutoElectNG: 6:13pm On Apr 01, 2019
Happy for you!

That's why I wasn't dogmatic.....it could have been any number of issues

Glad you are sorted
Re: ABS Wahala by Whynow(m): 6:16pm On Apr 01, 2019
AutoElectNG:
Happy for you!

That's why I wasn't dogmatic.....it could have been any number of issues

Glad you are sorted

He is a professional.
I had to sent the car to him through my mechanic, and he communicated through out diagnosis and repair
Re: ABS Wahala by Whynow(m): 7:42pm On Apr 01, 2019
AutoElectNG:
Happy for you!

That's why I wasn't dogmatic.....it could have been any number of issues

Glad you are sorted

Let me thank you for sharing his contact. God bless you.
Re: ABS Wahala by AutoElectNG: 2:25am On Apr 02, 2019
Autologic owes me beer!
Re: ABS Wahala by autologic: 8:38am On Apr 02, 2019
AutoElectNG:
Autologic owes me beer!
My brother ,take this chilled Origin grin
Thanks ,I owe u for this one when u come to Lagos.
@Whynow .thanks for the update and the poweful review.
Soon ,I will update the house with the thought process for the diagnosis.

Re: ABS Wahala by obekediamondfuto(m): 10:51am On Apr 02, 2019
autologic:

My brother ,take this chilled Origin grin
Thanks ,I owe u for this one when u come to Lagos.
@Whynow .thanks for the update and the poweful review.
Soon ,I will update the house with the thought process for the diagnosis.

me nko?
grin
Re: ABS Wahala by nurey(m): 11:29am On Apr 02, 2019
autologic:

My brother ,take this chilled Origin grin
Thanks ,I owe u for this one when u come to Lagos.
@Whynow .thanks for the update and the poweful review.
Soon ,I will update the house with the thought process for the diagnosis.

another daunting issues hacked to death. daunting baba thumbs UP
Re: ABS Wahala by autologic: 8:35pm On Apr 02, 2019
Using a labscope to view the waveform of the Abs wheel speed sensor .Good side abs waveform shown below .
Observation : Note the uniform amplitude of the signal waveform due to ring airgap spacing correctly aligned in relation to the sensor position .

Re: ABS Wahala by autologic: 8:47pm On Apr 02, 2019
Faulty wheel speed signal waveform
Observation : Non uniform abs waveform due to skewed ring airgap not aligned in relation to sensor position

1 Like

Re: ABS Wahala by autologic: 10:00am On Apr 03, 2019
Live data graph of the faulty sensor in relation to the rest of the other sensor during driving before repair .
Observation :Note how the left wheel speed signal is dipping to zero at certain interval marked by the red ink and inconsistences relatively to the rest .

Re: ABS Wahala by autologic: 8:30am On Apr 04, 2019
Live data after repair .
See the consistent waveform.

Re: ABS Wahala by Kashif(m): 9:32am On Apr 04, 2019
Well done autologic. Nice scoping.
Re: ABS Wahala by FuckoffMOD: 8:21am On Apr 05, 2019
autologic:
Faulty wheel speed signal waveform
Observation : Non uniform abs waveform due to skewed ring airgap not aligned in relation to sensor position
.which side u in Lagos?
Re: ABS Wahala by autologic: 10:11am On Apr 05, 2019
Kashif:
Well done autologic. Nice scoping.
Thanks my brother . cool cool

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