When my car goes through water it usually goes on and after it sits a while it goes off. I understand that there are some wheel sensors that may be getting wet. Can someone point me in the direction of where these are. I have also have had the Abs also fault but again after it sat for a while it no longer went on. I actually washed the car and same thing happened

 

The 4 ABS / Traction Control sensors are on the top of the axles and a 8 or 10 mm will get them out

They are plastic bodied ( with a stainless steel "can "in the rusted axle hole) so they can break on removal and this may explain if water is getting inside the sensor

There are 2 sets of part #s for the 4 and are different sets after a certain car production # . 8 #s

They are very expensive

But someone recently came up with a substation

No jacking or wheel removal needed to get to them

To check them at the time of fault you can remove the connector on the ABS / Traction control module

The module connector if I remember correctly has a rubber seal inside



The color pairs are the 2 wires to each wheel sensor and the fundamental meter reading of 1300 ohms is what I found on mine but have heard of 600

The sensor is an inductor so you know how to properly read it

A way you can operationally test the sensor is spin the wheel in the correct direction of travel and you will see 1 volt AC ( AC )

 

Traction control only monitors the rear wheels, but uses the ABS wheel speed sensors to detect anomalies in wheel speed relative to each other. Consequently, a rear wheel speed sensor/wiring issue usually triggers the Trac fail and ABS fail warnings simultaneously.
Are you experiencing the faults simultaneously?

 

Traction control compares the rear wheel rotation speed to the front if it is a no slip differential but a slip differential measures rotation between the 2 rear wheels as they should be the same

The later designs have a Yaw sensor if the rear end lets loose around a curve and going into a car spin

I can't remember the type of differential it has

 

I have had them fault at the same time and have had the tra fail fault by itself

 

read the codes

 

There are no codes

 

not even a c1095? if you’ve never resoldered the module it’s guaranteed to be there




you can use the x308 rear wheel speed sensor if you splice the wires and splatter some superglue on it so it doesn’t come loose

 

The cars of the last 20 to 30 years have P codes, B codes, C codes and U codes.

The ONLY codes required by the EPA are P codes (powertrain) for emission testing and are UNIVERSAL as of 1996 in the U.S.

Each car manufacturer can use different software for the B, C and U codes.

A car can have severe faults in a Chassis or Body system and show NO DTCs for the Powertrain!!!

 

i have this same issue that just started on my 95 xj6. When I start the car I have no warning lights, ABS and TRAC FAIL come on after I roll 7-10 car lengths. I seem to remember hearing that LEFT rear keeps the Speedo signal. I never lose the speedo for what it’s worth.

i have not checked the power solder joint as I have no lights until I begin to roll, therefore I believe it is not a power issue. Am I correct or should I still investigate?

 

It will be a ABS sensor. Get a reader and find out which one.

 

The fact the fault doesnt emerge when you start the car, but only when rolling is a good clue that it is likely a wheel sensor. The system continually monitors the wheel speeds relative to each other, and can conclude that a sensor is faulty by virtue of its speed reading being improbable compared to the others, eg when you are driving in a straight line and are not on the brakes, the readings should be more or less the same. If one sensor is continually different, it will likely trigger a fault. The system resets each time the car is started, so the process repeats.
I have an old BMW where this is a relatively regular occurrence, caused by brake dust accumulating on the reluctor rings of the front wheels. Easily resolved with a wire brush, but I have not heard of the X300 suffering from contamination in this way.
Trac fail without ABS fail would point away from wheel sensors, as they are common to both systems

 

Both of the older jags I've owned with this issue, turned out to be the power pins on the bottom of the ABS module. They had tiny breaks in the solder to the PCB board and just had to be resoldered. The wheel speed sensors rarely fail and can be very very dirty and still work properly. I'm doing the front end right now on my X305. Its amazing how dirty the wheel speed sensors were when I pulled them. But still working fine.

Here is a video I did showing how to fix this issue:

 

, so it looks like my speed sensor on the rear of my car the cable is separating from the speed sensor and it may be broken. Is there any way to replace that first part of the cable or do you have to replace the whole. It still seems to be working okay but again when it rains it stops working or I get to track fail. Also I see the rear speed sensors are out there but I haven't seen any front speed sensors zero different part number