ESP, ABS, ECU problems
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Joined: Oct 2019
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MB W164 280CDI 2006
ESP, ABS, ECU problems
A local mechanic broke my steering angle sensor, which I now replaced and calibrated correctly. I am now getting the same error messages as with the faulty SAS (see pics). Before, however, I could override the ABS fault and reset it manually by running a road test so it would function properly. Now I can’t even do that. The lights just stay on – ABS, SRT, and red warning that ‘braking behavior’ has changed. Also ESP not available. As the ESP is coupled to the adaptive power steering I don’t have that either, which affects steering only when standing.
I can start the vehicle and drive it normally, just without the electronic assistance devices (which I didn’t have any in of my previous cars until 2001 anyway).
I could check the ECU if I only knew where it is located. My internet search didn’t produce anything useful either. In my thinking the problem could be only two things: the wires to the ECU, or the ECU is broken.
So any ideas from the community? Any help would be greatly appreciated.
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From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Thread Starter
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MB W164 280CDI 2006
You got nothing else to contribute? I live in Cambodia in the province. I tried out a local mechanic who fixed the steering rack that was leaking just fine but broke the sensor re-installing it turning the steering column. You know you can release the column so you turn it freely.
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MB W164 280CDI 2006
ESP light comes on
Hi, I am back on this thread. I got my truck working again after several different repairs except the Airbag light is still on, and the ESP light comes on when I accelerate past 80 km/h or go around slight curves at that speed. My Icarsoft doesn't give me any DTCs to work with for the ESP. Airbag light DTCs still the same with resistance high not only the driver airbag but front side passenger, rear passenger. I am guessing a total reset of the airbag module would do the trick.
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Thread Starter
Newbie
Joined: Oct 2019
Posts: 14
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MB W164 280CDI 2006
I now finally found the cause for my problem. Everything works just fine. ESP/ABS lights are off. Steering angle sensor was replaced a while ago. No DTCs. Then I read about different tire sizes, which made me check my tire sizes. Lo and behold my front tires are 225 and my rear tires 235. The tire shop had put on wrong-sized tires in the front. A road test with the OBDII on showed that starting at about 80 the front wheels turn faster by about 2 to 4 kmh, which will then engage the ESP thinking there is an imbalance. AWD needs the same speed on all wheels, except in curves but it is programmed for that and then you have the Yaw-sensor which will see whether you are too fast going into a curve. With two different-sized tires the light comes on sooner. Also remarkable, the wheel speed is the same on all four wheels up until 70 kmh or so. So problem solved. Unfortunately, the front tires aren't worn out yet.
