General Category > ABS related issues

Measure the pressure sensor...

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Borgia:
My mistake.

knappen:
i did try to measure the pressure sensors but i don´t know what the values mean...
Ohm and  200K

Old White:                                     NEW White:
Blue + second cable = 15.8             Blue + second cable = 33.8
Blue + 3:rd cable = 5.2                   Blue + 3:rd cable = 5.3
Blue + 4 = 29.9                              Blue + 4 = 21.3
Blue + 5 = 0                                   Blue + 5 = 0
Blue + 6 = 0                                   Blue + 6 = 0
Blue + 7 = 0                                   Blue + 7 = 0


Old Black:                                       NEW Black:
Blue + second cable = 34.6              Blue + second cable = 33.7
Blue + 3:rd cable = 7.5                    Blue + 3:rd cable = 5.2
Blue + 4 = 31.3                               Blue + 4 =30.9
Blue + 5 = 0                                    Blue + 5 = 0
Blue + 6 = 0                                    Blue + 6 = 0
Blue + 7 = 0                                    Blue + 7 = 0


Seams like the old white blue+2 value are to low... and on the NEW white the Blue+4 value are lower than the others.

Maybe that is why the don´t work. I will try to solder the old Black to the Old white Cable.

knappen:
Are they both broken?

I will attache a picture from the test, with the same ABS unit but 2 different sensors.
This one is hanging outside ABS unit loose and the when i press the rear foot brake the ABS motor hangs and i have to shut down the power.


Fault code with this one:
24972
Pressure in rear wheel circuit too high

knappen:
from second hand unit, only  changed the sensor but the same ABS Unit.
This one i mounted inside the ABS unit and the system is liquid filled and i have done the bleeding.
When i press the foot brake nothing happens...

I do get a different fault codes also.

25072 : Faulty ADC value of rear speed sensor
Currently present : YES
|
24955 : Internal control module error - Analogue value, rear pressure sensor
Currently present : YES
|
25193 : Brake fluid level too low
Currently present : YES

Jughead:
Yes Knappen, unfortunately they are both faulty.

Have a look at these values.  They should be around 20 - 25Bar.  I have only indicated the one value, but the one above it is also too high.  Both of these values are for the wheel circuit, which means that both the sensors on the same unit (the one with the long cable) are faulty.  I do note though that you have a brake fluid low warning, which could complicate matters.  Fill the fluid correctly and then try again.



On the other module, this value is "0 Bar", which would indicate that it too is faulty (Also the wheel circuit, also the unit with the long cable)



In your photo you posted, this is how the sensors are laid out.



If it helps, this is how the pump is divided.



So from the second pic above "Pressure wheel circuit Rear" would refer to the sensor that is located in the Rear wheel circuit quadrant (Bottom Left) of the pic above.

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