![]() I've never had a problem like this with my M元20 or my 560SL. Thanks for your help - I know this is frustrating, because it is frustrating me. If I can eliminate the battery, then I can focus back on the speed sensor. You can see, that I'm thinking of pursuing the possibility of the battery/low voltage being the problem. Should I just take it to Autozone and let them do a load test? Can you disconnect the negative terminal and perform the voltage test, without "killing" or erasing any of the electronic components? I haven't found a clear thread on how to check the voltage on the battery. Since it has a battery and a 'backup" battery, the test needs to isolate the main battery. I'm just not sure of the good procedure on this ML. I have a multimeter to check the battery. I'm wondering if the battery is bad (its three years old) or if there is a "vampire" that is slowly draining the voltage overnight.ĭo you think low voltage could be causing these two warning lights and the ESP faults? After all, one of the original fault codes in the ESP was "Event 6001 the supply of voltage to the control unit is too low (undervoltage). The possibility of the battery being drained overnight has got me to thinking. But, its very noticeable when compared to my M元20 or 560SL which cranks strong and starts instantly. ![]() It doesn't turn over several times before starting. Just to clarify, when i say "slow" start, I mean the engine turns over slowly for two times, but "catches" and starts every time on the third revolution. The "slow" start only happens when I'm the first person to drive it in the morning. ![]() This is my wife's car, so I don't normally drive it and when I do, the engine is 'warm'. But, it starts on the third "revolution", so I thought it might just be normal for this model. i noticed something that I've noticed before - when the ML is cold (not started recently), or been sitting overnight, the engine turns over slowly, as if the battery is weak. This morning, I went out and started the ML, first thing. I balked at purchasing all of those parts without knowing for sure if that would fix the problem. But, they would not sell me the sensor without including the brake pad wear sensor and bracket (basically, everything in the photo you included in your last post). I called the Mercedes dealership yesterday with the idea of purchasing the speed sensor and replacing it (approximately $128) to see if that fixed the problem. I am researching this "preconditions" message and will probably call Autel as you advised. With the ESP, when I try to clear the codes, I get the message about the "Preconditions" not being met, so I'm not able to do the rest of the steps. ![]() This procedure worked for other faults in other modules, except the ESP. Turn OFF the ignition and remove the key.ħ. Have the key in the ignition in the ON position with the engine OFF.Ĥ. They both give the same instructions for clearing codes:ġ. I've even downloaded the latest version (same as the one I have in paper) from Autel's web site and read that one. I've read the Autel user manual several times. I know what you mean - I feel I'm running in circles, too. I already read the thread " M元20 CDI ongoing self braking problem? ", but does not look like my problem. Has anyone seen something like this before? I know that the wheel bearing comes with the magnetic ring. I also discovered that it had a frontal collision of some type, cause I discovered a few mis placed/ broken parts while changing the rpm front sensors. The car was bought used 2 years ago, and was until one month ago that the ABS/ESP & front wheel problems started. If I reset the errors in ABS/ESP, and start driving the car, the front right wheel brakes get engaged like crazy, kind of expected, as ESP sees left wheel "stopping".Ĭurrently, I am thinking that the magnetic ring might have some damage. ![]() I have done the test at multiple speeds, from 10km/h to 40km/h. I have a iCarsoft scanner, and if I read ESP -> running values -> rpm sensors, I can see that all four report speed, *but* front left speed is strange, goes up and down as the wheel turns, while the other three wheels show a 'constant' speed. I already replaced ALL rpm sensors, but front left wheel is still strange. I have a 2008 M元20 (164.122), were ABS/ESP says it is not available. ![]()
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