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Diagnosis faults of ABS

I just want some information on diagnosis some of the faults of ABS.
as i want to do some presentation on my asingnment. so can u give me some kind of information on it which could be helpfull ........
thanx......

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  • Toyota Master
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The number one "fault" of ABS is the NOISE that it makes when the ABS is activated. It makes a horrible banging noise, the brake pedal pulsates, and, if you have never heard it before, you'd swear that the front end was being hit by a lot of hammers. That being said, ABS is really a good idea to be on all cars. The only downside is that it does not work at all if the vehicle is sliding on ice, and all 4 tires are sliding. Then, there is no traction for the ABS to pulse fluid to a specific wheel or wheels.

Posted on Sep 09, 2008

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Posted on Jan 02, 2017

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2 Answers

Abs light is on


When the ABS warning (or any other for that matter) comes on a fault code is set in the computer control module, to start diagnosis and testing you need to have that fault code, that requires the ABS system be scanned for fault codes. Right now the ABS system has been disabled until the problem is repaired.

Dec 20, 2016 | Jeep Cars & Trucks

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How do I obtain a list of the ABS fault codes/ definition and diagnostic procedures


Try this: https://www.youtube.com/watch?v=Tf9ygGnJ-6o But there is not a lot of information on brake systems because of the liability and royalties that are involved.

Feb 25, 2015 | Cars & Trucks

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Acadia 2009 code C0561 what does it mean?


You won't find this information in a Haynes manual ! I know , I work for a GMC dealership , along with Chevy and Cadillac ! this information I'm adding is right out of GMC service information .
Diagnostic Instructions
?€¢
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.


?€¢
Review Strategy Based Diagnosis for an overview of the diagnostic approach.


?€¢
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC C0561 71: System Disabled Information Stored Invalid Serial Data Received

DTC C0561 72: System Disabled Information Stored Alive Counter Incorrect

DTC C0561 74: System Disabled Information Value of Signal Protection Calculation Incorrect

Circuit/System Description
The electronic brake control module (EBCM) receives serial data messages from the body control module (BCM), engine control module (ECM), instrument panel cluster (IPC), and the transmission control module (TCM) which are needed to perform antilock brake system (ABS), vehicle stability enhancement system (VSES), or traction control system (TCS) functions.
Conditions for Running the DTC
Ignition voltage is greater than 10 volts.
Conditions for Setting the DTC
The EBCM receives an invalid serial data message from another module.
Action Taken When the DTC Sets
?€¢
The EBCM disables the traction control system (TCS)/ vehicle stability enhancement system (VSES).


?€¢
A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC
?€¢
The condition for the DTC is no longer present.


?€¢
The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
This DTC indicates that there are no problems in the EBCM. The BCM, ECM, IPC and the TCM should be checked for a possible fault.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference Component Connector End Views
Description and Operation ABS Description and Operation
Electrical Information Reference ?€¢
Circuit Testing


?€¢
Connector Repairs


?€¢
Testing for Intermittent Conditions and Poor Connections


?€¢
Wiring Repairs
Scan Tool Reference Control Module References for scan tool information
Circuit/System Verification

  1. With a scan tool, view the Invalid Signal Data Display.
  2. If no invalid signal are present, view Signal Fault Data in the Enhanced DTC Data.
  3. Refer to appropriate module for diagnosing the invalid message data.
  4. Do not replace the EBCM due to this DTC fault.
You would need a factory scan tool or equivalent too diagnose this ,not a code reader . So do your self a favor an take to a dealership. I've been doing this for thirty years .

Sep 26, 2014 | 2007 GMC Acadia SLE

1 Answer

Fiesta duratec 2005 Abs warning light on


Whenever the ABS module turns on the ABS light in the dash it is to alert you to the fact that a fault has occurred in the ABS system and the control module has turned off the ABS brake control, you now have regular non ABS brakes. The waring light will stay on until the fault is corrected. Since a large number of problems would cause this you must get the control module scanned to retrieve the fault code that was set in the control modules memory when it turned on the light. Once the fault code is known the process of diagnosis and repair can begin.

Feb 10, 2012 | 2005 Ford Fiesta 1.6

1 Answer

The abs and service light comes on my clio when i get to 50


When these lights come on this indicates the systems control module has detected a fault in the signal or signals of most likely one of the 4 wheel speed sensors (most common reason for this scenario). What must be done now is to have the system scanned with a diagnostic scanner to see what fault code is present in memory, this is the beginning of the diagnosis required to repair the problem.

Nov 29, 2011 | Cars & Trucks

1 Answer

The TC/ABS lights are on in my 2006 cobalt, whats does that mean


the ABS light comes on because there has been a fault detected in the ABS system. The ETC uses the ABS system to function. Anytime the ABS light is on the ETC light will also be on.

Your best bet is to have the ABS system scanned for trouble codes. Your local parts store may be able to do this for free otherwise you will need an ABS specific code reader, a high end multifunction scan tool, or bring it in to a shop to have an ABS diagnosis preformed.

Once you know what code(s) are present you will have a much better idea of where to start looking to fix the problem.

Post the codes here and I'll be happy to help you out further.

Sep 30, 2011 | 2006 Chevrolet Cobalt

1 Answer

Abs / brake light warning lights are both on. brakes sometimes squeel and other times grinds


the ABS light comes on because there has been a fault detected in the ABS system. If you notice the "grind" when making slow stops than you have an issue known as overactive ABS.

Your best bet is to have the ABS system scanned for trouble codes. Your local parts store may be able to do this for free otherwise you will need an ABS specific code reader, a high end multifunction scan tool, or bring it in to a shop to have an ABS diagnosis preformed.

Once you know what code(s) are present you will have a much better idea of where to start looking to fix the problem.

Post the codes here and I'll be happy to help you out further.

Sep 30, 2011 | 2002 Chevrolet Tahoe

2 Answers

Why does my abs light stay on?


Dear Madam or Sir,

this is possibly due to a faulty ABS-Wheel-Speed-Sensor. There is one mounted to each wheel, the ABS control unit compares all four signals to compute the moment to intervent. If there is one signal unplausible or missing, the control light will appear to show you that there was an error recognized and stored to the control unit´s memory.

You should see the shop to access the fault memory via diagnosis eqiupment to get to the heart of the matter.

Kind regards from Germany,

AutoDoc P. :)

Jun 25, 2010 | 1996 Chevrolet Blazer

2 Answers

My abs light stays on on my ford focus


when the ABS light stays on it means there is a fault present in the ABS system and the ABS has been disabled, as long as the light is on u just have regular brakes with no ABS, there are many thinbgs that can turn the light on, most common is one of the wheel speed sensors is defective, since these sensors are about $75-100 each and there are 4 of them guessing is a poor idea, so what u need to do is have the ABS systwem tested, there will be a fault code present to help narrow down the defective part or wiring.

Dec 28, 2009 | 2004 Ford Focus

2 Answers

Have replaced ABS module on bmw 525 E39 and ABS now ok, but the ASC lamp will not go off on the dash and fault code 23 (incorrect coding) will not clear from system? Everyone told us the ABS ecu does not...


ABS/ASC module is faulty
CLASSIC ABS FAILURE SYMPTOMS:
- Most of the time, the problem is the ABS module or one of the 4 wheel speed sensors (& sometimes the brake pressure sensor)
- In my 2002 BMW E39 DSC, three orange (warning) cluster display lights lit, ABS, Brake, & DSC
- The 3 warning lights reset when the ignition is turned off, only to repeatedly reappear within minutes of normal driving
- The fault is often intermittent leading you to falsely believe you've resolved the problem (proper diagnosis is important)
- Sometimes the fault only appears when the engine is hot; other times only at speeds over 40 mph
- Carsoft may erroneously show a rear speed sensor failure; but just replacing the speed sensor may make no difference.
- All the work is in correct diagnosis of the problem; parts replacement is trivial (from 1 to six bolts in a few minutes)
- Hence, this BMW E39 ABS 3-warning light DIY will concentrate on understanding and diagnosis of the problem

Oct 23, 2009 | 2001 BMW 5 Series

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