vw passat ABS problem

[nikoz]

VW PASSAT YEAR 2002
VIN: WVWZZZ3BZE121561
ENGINE CODE: AVB
1.9 PDTDI 74 KW

No fault code. But ABS pump strarts when the car goes at slow speed and when gently press the break pedal. Cause of this problem may be?

[tonyboy101]

check pick up rings on driveshaft as they crack
hope this helps

[Fordracer4life]

I have had loose sensors on the front wheels as well as rust under them causing the air gap to be to large.

[nikoz]

i check wheel sensors on all wheels. looks ok and clean. Speed of all 4 weels is equal...

[Ashraf6119]

Hello,

Check the front Sensors as Fordracer4life says Front Sensors do come out on its on and cause this kind of fault.

You just need to push it back in again, and most of the time is the front lift wheel do cause this.

Normally if you diagnose the ABS system it should tell you which side sensor is causing this fault or if you look in live data you will see the faulty sensor will have different reading from other sensors.

Hoe this helps.

Ash

[nikoz]

there is no any fault in ABS ECM. I use Multi di@g diagnostic equipment and like I said there is no fault. Just ABS pump start to work. Sensors are in right position. And also like I said, the speed of all wheels are same. So, all sensors works properly....

[ziggystardust]

there is no any fault in ABS ECM. I use Multi di@g diagnostic equipment and like I said there is no fault. Just ABS pump start to work. Sensors are in right position. And also like I said, the speed of all wheels are same. So, all sensors works properly....
first post again = check the the rings on the drive-shaft for cracks .
otherwise u can take all information from one sensor that work and connect them 2 the abs unit

[Autotecno2006]

hi, had passat in yesterday to replease a CV joint, abs done same thing afterwards, abs sensor needed to be adjusted in wards, Ashraf6119 post is 100%.

[cqae]

I reckoni everyone is on the money here, something along the lines of signal issue. If its had drive shafts or wheel bearings the new ones may have different amounts of theeth & sending wrong messages back.

[pimpin]

HI I MECANIC AND I HAVE THIS PROBLEM ALL TIME AND I FIX JUST REPLACE ALL FUSE FROM THE ABS SYSTEM

[pimpin]

TRUST ME, EVEN IF THE FUSES LOOK WHOLE AND GOOD, REPLACE THEM. EVEN WITH A WHOLE FUSE, THE CONTACT POINTS LOSE VOLTAGE AFFECTING THE WAY THE ABS PUMP WORKS

[Albanais]

YOU MUST BLEED THE BRAKING SYSTEM, YOU HAVE BUBBLES ON ABS BLOCK, THE REASON OF ACTIVATION OF THE ABS AT SLOW SPEED IS ONLY THIS. BLEED THE ENTIRE SYSTEM OF BRAKING AND YOU WILL NOTICE IT AT VERY FIRST MOMENT

[slick50]

Live data look at. drive car slow very and watch for the one sensor that is dropping out as you near to stopping.
This wheel is one to look at sensor bad/need adjust. When problem get worse ABS module code appear. I no mekanik drink beer is good too:)

[vdubman1]

Live data look at. drive car slow very and watch for the one sensor that is dropping out as you near to stopping.
This wheel is one to look at sensor bad/need adjust. When problem get worse ABS module code appear. I no mekanik drink beer is good too:)


if you have vcds measure value block 001 you have all 4 sensors showing in this order lf rf lr rr drive slow 15kms and less slow to a stop !!

it will show up easy !!!!


:congrats::congrats::congrats:

[nikoz]

Thanks to all!!!