w204

[ayoubovitch]

hello to all
I have a Mercedes w204 the ABS warning light comes on and is displayed on the dashboard when I put the diagnosis, it gives me two error codes (speed sensor rotation of the left front axle and sensor rotational speed of the right rear axle with an electrical problem).
I changed the sensors but the problem is always the same side, that is to say that the sensors are good there is a problem in the wiring. I tested the wiring. I find it good. Finally, I think that the ABS block is necessary. I come with another block, but also it gives me the same side and I don't understand that help me please
thanks.

[Louislesinge]

Hi,
How comes the fault light on after deleting the errorin ABS, immediatly when your ignition on, of after driving a few?
If you can delete the fault code and it only comes back when you drive it, check the targets in the bearings or rings.
Greetings,

[ayoubovitch]

A fire broke out in the right side of the car the defaults are always permanent in the static state and denamic

[Louislesinge]

Re,
So wires are ok for continuity but should be on short-circuit to + or ground.
Greetings,

PS think about pushing "thanks" when you got answer...

[ayoubovitch]

The wires are correct for continuity, and also it doesn't short circuit to + or to ground

[Louislesinge]

Re,
There should be no mistery: new sensors, another ABS tested, so something must be wrong in the way you do the tests.
Did you check the voltage on the sensors wires with ignition ON? Did you compare them to the others?

[ayoubovitch]

I measure the wires voltage of the sensors with the contact is puts the values ​​are front right 10.28vrear right 1.65vrear left 10.28vfront left 0.02v

[ayoubovitch]

i measure the wires voltage of the sensors with the contact is puts the values are
front right 10.28v
rear right 1.65v
rear left 10.28v
front left 0.02v

[Louislesinge]

Re,

"speed sensor rotation of the left front axle and sensor rotational speed of the right rear axle"

i measure the wires voltage of the sensors with the contact is puts the values are
front right 10.28v
rear right 1.65v
rear left 10.28v
front left 0.02v

So you certainly got two short circuits (or part of short circuit) to ground!

[ayoubovitch]

Where can it be! Is it at the sensor or cabling!

[Louislesinge]

Re,
You should disconnect ABS and check resistance between the two wires and ground and repeat continuity test between ABS connector and sensors.
How did you measure the voltages you post, with or without sensors connected? If it was with sensors connected, check again without sensors.
Check sensors resistance and compare them (but it would be a rare instance!).

[ayoubovitch]

okay I'll do what you told me and about the voltage measurement with connected sensors

[hesham10]

switch ignition off then only on .. scan the abs then ensure faults active and history or only history ? i see your pic but don't know the exact time and circumstances .. if not active check (tyres sizes . rims . sensor rings) or any mechanical issue .. if active with ignition on all the time it would be electrical (abs module itself . wiring . sensor) so disconnect four sensors and measure each resistance and compare your known good one with each other or let 4 sensors disconnected and also disconnect main abs harness and check continuity for (2 wires*4 sensors=8 wires) or short to positive or ground ... if still not check for your abs pinout if some one made a mistake and two wires replaced each othres as you get two sensors