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What is abs and why does shows breaks fault and why is not reading speed

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  • Cars & Trucks Master
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ABS is Automatic Brake system. Brake system is a very important saftey device. This is not DIY. You need to get it repaired by your dealer, or very well trusted repair shop as soon as possible. Drive with care.

Posted on Apr 13, 2015

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Posted on Jan 02, 2017

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ABS light on, high RPMs, Speedomoter not working. Problem is intermittent but becoming regular. Could this be a Serpentine Belt or Trans speed sensor? 3 - O2 sensors replaced, issue continues


first thing is to read the fault codes as none of those faults are connected
could be faulty connections to ECM or ECM itself but the fault codes will show each problem

Sep 09, 2016 | Cars & Trucks

1 Answer

My citron pricasso show on the dashboard - break fault and abs non function als doesnt show speed reading


speed reading may be a bad vehicle speed sensor or broken / disconnected wire to that sensor ~ it should also light up your check engine light ~ confirm by using a scanner to get a trouble code

abs brakes, similar process ~ need a scanner to find out which sensor went bad or wire disconnected to it or visual inspection of those sensors

Apr 13, 2015 | 2009 Citroen Xsara Picasso

1 Answer

Abs on vr commodore light stays on solutions


Error logs are a great thing. They will help you find intermittent problems and start you off in a general direction of where a problem could be. There is a great level of detail on the justcommodores site on checking error codes logged by the engine management system, but this does not detail anything about the abs system. The abs warning light is not as common as the check engine warning light. Reading through the posts, I haven't found any detail on checking error codes logged by the abs system.

So here it is. For those of you familiar with checking the engine error codes, this procedure is so simple its not funny.

Basically, to check the engine error log, you bridge the 5th (ground) and 6th pins in the ODB connector under the steering wheel.

To check the ABS error log, using the same trusty calibrated paper clip, you simply bridge pins 5 and 12 of the connector.

To find pins 5 and 12, start at the top left hand corner. That is pin one. Going to the right, you count pin 2,3,4 etc. Once you get to the end, jump back to the start of the bottom left level of pins and keep counting. Pin 5 is about halfway along the top row, pin 12 is a little left of the middle in the bottom row.

Reading the error codes is the same procedure (counting the flashes), except now, the ABS light flashes (as opposed to the engine light when checking the engine codes).

The ABS log also uses code 12 firstly, with any errors logged shown after that. If no errors are logged, the 12 will flash again.

Error codes for the ABS error log (VR/VS) are as follows:

12 Diagnostic system operational
21 Right hand front wheel speed sensor fault
23 Right hand front wheel speed sensor continuity fault
25 Left hand front wheel speed sensor fault
27 Left hand front wheel speed sensor continuity fault
28 Wheel speed sensor frequency error
31 Right hand rear wheel speed sensor fault
33 Right hand rear wheel speed sensor continuity fault
35 Left hand rear wheel speed sensor fault
37 Left hand rear wheel speed sensor continuity fault
41 Right hand front inlet solenoid valve circuit fault
42 Right hand front outlet solenoid valve circuit fault
45 Left hand front inlet solenoid valve circuit fault
46 Left hand front outlet solenoid valve circuit fault
55 Rear inlet solenoid valve circuit fault
56 Rear outlet solenoid valve circuit fault
61 Pump motor relay circuit fault
63 Valve relay circuit fault
71 ABS control module internal fault

The above guide has been verified on a VR/VS. Checking the error log on all models prior to VR/VS is the same for the engine log, and I would assume that the same can be said for the ABS log, would be happy if someone could verify this for me.

Sep 21, 2013 | 2005 Mazda Tribute

1 Answer

Grinding noise in front brakes of a 1993 olds cutlass supreme


Assuming this vehicles brake linings are ok and not worn out, it sounds like you have an abs rotor fault. The abs is working while your are braking because it cant read the road speed correctly. So you are feeling the abs motor working.

Jan 02, 2013 | 1993 Oldsmobile Cutlass Supreme

1 Answer

Abs


sounds like the anti lock pump is gloing out

Oct 27, 2012 | 1998 Chevrolet Blazer

1 Answer

Yesterday my S type jag 2003showed a ABS/DSC/Gearbox alternating fault on my dashboard. Every time I switch on the ignition and start to move forward in drive at between 2 and 5 miles an hour, the car...


SOUND LIKE FAULT IN A WHEEL SPEED SENSOR OR ABS BRAKE UNIT.. BUT HAVE JAGUAR DEALERSHIP CODE SCAN ABS HYDRALIC MODULATOR BRAKE UNIT. SEE WHAT FAULT CODES SHOW UP.

Jun 14, 2011 | 2003 Jaguar S-Type

2 Answers

Audi ABS breaking system error


if the ABS fault light comes on as you turn on the ignition and control unit can't be accessed with a fault reader then the control unit itself is faulty and must be repaired or replaced. if can be accessed, should store a fault in the memory, most probably in a wire to wheel speed sender. if light comes on only after vehicle is in motion than fault will be a dirty or incorrectly adjusted speed sender.

May 15, 2010 | 2001 Audi A4

1 Answer

I have a 99 Discovery II and the Traction Control, Hill Descent Control and ABS lights have suddenly come on. What is the system fault or, in the alternative, how can they be reset?


Can't be reset if your ABS system or some component is faulty. check speed sensor on the wheel bearing, is there any rubbing or dull grinding noise coming from the front wheels? could be the entire bearing and speed sensor assembly has gone bad. this would cause all these faults to appear as that sensor triggers all these events in order to slow your vehicle while it downshifts itself and applies breaking to control the vehicle as a part of the stabilization system. The alternative is that the ABS system is not functioning properly and the trac control and hill decent systems are being deactivated as part of the fault. If the system cant apply breaking then the systems are rendered unavailable. the vehicle will stop but not using ABS just regular breaks. Check all ABS break fuses for damage.

Dec 12, 2009 | 1999 Land Rover Discovery

1 Answer

When breaking the abs goes off when you get down to about 5miles


rust build up between your wheel speed sensor and knuckle in 1 or both of your front hubs likely causing vehicle to think lockup has occured at low speeds. replace your faulty wheel speed sensor/s. monitor with scan tool that shows individual wheel speed of front sensors and replace the 1 that does not read the same as the other 2

Nov 17, 2009 | 2000 GMC New Sierra 1500

1 Answer

Breake will not stop in low speed collision


have ur abs checked one of the sensors may be corroded or damaged causing the abs to activate at low speed and usually doesnt give an abs light need the resistance read on sensor

Oct 12, 2009 | 2005 Chevrolet TrailBlazer

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