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  #1  
Old 03-30-2017, 10:04 AM
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Ml320 self braking while driving

My wife was driving our ml 320 it is a 2002 with 141,000 miles.She claimed it came to a screatching Stop while driving.I drove the vehicle after work it ran with no issues.I have had a SRS light on for a few weeks due to the right passenger seat pad system sensing a weight.She won't drive the vehilcle and I have no other fault codes or lights on.The esp switch engauges and disengages with the yellow triangle.My local Mercedes dealer is not a good shop.Any help in this matter is appreciated it is over the Internet about the Yaw Rate sensor?
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  #2  
Old 03-30-2017, 02:27 PM
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Location: Los Angeles, CA
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Hello - the ML 320 has (at least) two kinds of sensors, a lateral acceleration sensor, and a yaw sensor. It definitely sounds like there is some sort of malfunction there or some sort of calibration issue. I would find a good shop and take it there asap - other members should chime in to confirm this too. Best of luck!


-Dmitry
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  #3  
Old 03-30-2017, 04:55 PM
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Thanks Dmitry at pelican parts. a bad issue.and dangerous
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  #4  
Old 03-30-2017, 07:22 PM
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This also might have BAS ( Brake assist ) where if the ABS / ESP system thinks the driver is rapidly applying the brakes, the system will take over and apply maximum braking force.

I haven't worked on this specific system so can't offer any help beyond scan it for codes.
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  #5  
Old 04-02-2017, 12:05 PM
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97sl320 I have a scanner the icarsoft mbII on the way will scan and get some codes and go from there. This Monday.Very concerned about this happening my wife most likely will no longer want to drive this Benz
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  #6  
Old 04-02-2017, 05:32 PM
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Please post in the thread below how well it works. Someone else was looking for a scan tool.

Which scan tool for w140?
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  #7  
Old 04-04-2017, 03:31 PM
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Ok so I had multiple coeds in the abs and when I scanned the wheel speed sensors it was showing various speeds from 16 KPH to 4200 KPH one was jumping from 2000 to 4000 why was it showing any speed?
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  #8  
Old 04-05-2017, 12:55 PM
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97sl320 I have multiple codes c1103,c1103-016,p1860,p186001,p2001,c1332,c1207,c1141,c1140,c1025, so mostly rake pressor sensor,right rear wheel speed sensor, rake light switch now these codes could have been here for years.I cleared all codes drove vehicle no further faults would any of these cause he brakes to self apply also I have a jumping wheel speed sensor from 1024 km/h to 3840 km/h I think it's a bad sensor breaking down or dirty?
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  #9  
Old 04-05-2017, 09:03 PM
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Jumping wheel speed isn't good, This can be caused by cables breaking internally due to flex, metallic brake dust building up on the toothed ring, rust building up under the sensor pulling it away from the toothed ring.

Are you really getting one thousand twenty four ( 1024 ) Km/h ? That should trigger a wheel speed implausible code.
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  #10  
Old 04-06-2017, 03:03 AM
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97sl320 the left front shows 16 km/h The RT front shows 4095.88 km/h the rt rear 1024 jumping the left rear shows 112 km/h shouldn't they read zero since it's now moving?
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  #11  
Old 04-06-2017, 10:52 AM
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It should show zero when not moving. I'd unplug a sensor and look to see if the speed drops to zero. I'd also plug it back in then spin a wheel to see if the numbers are consistent.

We want to determine if the scan tool is giving you accurate information. There is nothing worse than trying to diagnose a problem with erratic / malfunctioning test equipment.
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  #12  
Old 04-06-2017, 09:25 PM
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97sl320 I scanned it multiple times same exact results so the Icarsoft mb II work good enough.I do suspect some of the jumping around is a high resistance sensor.But all of them is strange but salt and road debris can be the issue as well.As soon as the weather cooperates the wheels will come off and or I will drive with the scanner connected.
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