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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG
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I was thinking of pulling each wheel / sensor connection & measure if AC volts coming from sensor itself.
Or voltage coming from wiring to sensor.
Pull off the abs connector at the wheel and measure the resistance there. Results will say either bad sensor or bad body harness.
 
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Sorry about that.

The 3 suspect sensors actually read 1.0 on the display, set to 2k ohm range.
Your meter does not show 1.0. It shows 1.
It means that resistance is higher then range selected. Switch to next higher range.

If you still have old sensors try to measure them on the bench. It will be somewhat difficult to get probes in without shorting them.

Then of course measure your sensors on the car.
 

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2000 E 320 Wagon + 2002 ML 500 SUV
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Discussion Starter #83
Ok guys I will asap & report back.
Thanks for your input.
I discarded old sensors.
But I will disconnect & measure each new one at wheel.
If that shows normal I MUST have a chaffed & broken wire in harness, correct ?

David
 

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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG
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If that shows normal I MUST have a chaffed & broken wire in harness, correct ?
One way or another.....but yes.

Or you could have a freak accident and have all three sensors die at the same time. I've seen that, actually. Stupendously rare, but it is not unheard of. Usually because all the failed parts were from the same batch on the manufacturing line....
 

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Discussion Starter #85
One way or another.....but yes.

Or you could have a freak accident and have all three sensors die at the same time. I've seen that, actually. Stupendously rare, but it is not unheard of. Usually because all the failed parts were from the same batch on the manufacturing line....
Deplore, Witek, Khomer & all:

Ok pulled RR ABS sensor off & guess what ?
No resistance.
On 2000 ohm setting display reads 1.0 static - touch probes to male terminals in plug - no reading no change.
That's a brand new aftermarket sensor & yes I ordered all 3 same time.
Sounds like a rarity but 3 dead new VSS ?

I will pull my one good one - LR that reads 1155 ohms (from BAS plug side) and double check it for comparison.

Love to hear input & thank you

David
 

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W163 W202 W203 W246 MB100D
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Hi David, by any chance, did you try on 20k ohm setting? Or next higher? just checking if its higher resistance (just a post i saw above asking this), goodluck.
 

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Discussion Starter #87
Indeed I did kept going higher it just moved decimal over each time.

I wonder if anybody reading this has an oem ABS wheel sensor they could check ohms on ?

I could kick myself for tossing the original ones !
 

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W163 W202 W203 W246 MB100D
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ok, looks like the aftermarket ones are bad - if proven broken (and brand new), I'd be interested to know details of these sensors etc so other members can be cautious before buying one

Happy to try this when my backprobes arrive, or maybe someone with their wheels off atm can help

Looks like the one with reading is within range as per post #73 (so would expect others within similar numbers at time of testing)
 

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1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG
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Deplore, Witek, Khomer & all:

Ok pulled RR ABS sensor off & guess what ?
No resistance.
On 2000 ohm setting display reads 1.0 static - touch probes to male terminals in plug - no reading no change.
That's a brand new aftermarket sensor & yes I ordered all 3 same time.
Sounds like a rarity but 3 dead new VSS ?

I will pull my one good one - LR that reads 1155 ohms (from BAS plug side) and double check it for comparison.

Love to hear input & thank you

David
Yeah seems you're on the right track.

Most likely all three of those aftermarket unit are dead.

You're probably better off going to PNP and yoinking OEM sensors and installing it.

They typically last the life of the car, unless you get salt...
 

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2004 CLK500 (Wifes), (2) 2005 ML500SE, 2004 ML500, 2000 ML320, 2002 ML320
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David, This if from my notes when I fixed my 05 ML-500 that had the terminal problems this spring.
Hope it helps in some way. Good Luck.

Testing ABS (Vehicle Speed Sensors) on Mercedes Benz W163 class.

1. Scan while driving using live data function to locate loss of signal.

2. Use wiring diagram of N47-5 (ESP module), locate the 2 wires for problem sensor, insert back
Probes.

3. 2 separate tests are performed on ABS sensors with DVOM:

3a: Resistance Test with ohmmeter should result in somewhere between 975 - 2300 ohms.
Note: resistance will be higher than across ABS sensor terminals due to length of wire.
across new after market sensors I got 750 to 800 ohms, MB sensors 960 - 1000 ohms.
The after market sensor works fine.

3b: Checks ABS sensor, axle reluctor ring, sensor to ring air gap, or rust or debris problems.
Set DVOM on VAC (volts alternating current), jack up suspect wheel, have helper spin tire at
1 revolution every 2 seconds, you should get approx. 200 millivolts or .2 VAC.

4. If above tests fail, you can check the entire length of each of the 2 wires from the N47-5 to the ABS
wheel sensor vehicle connector with a 25 foot length of 16 gauge wire and your ohmmeter.

These tests narrow your suspected culprits, and should be performed before purchasing any parts.
 

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2000 E 320 Wagon + 2002 ML 500 SUV
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Discussion Starter #91
Kustom1911:

Thanks great input !

Youre 'well sorted' re your notes on prior repairs - impressive.

Per your reminder on #4 I've soldered alligator clips to each end of 30' 16 gauge wire to check continuity on each VSS wire for 3 suspect sensors.

To check harness I have a small strand of copper wire Ill measure to make sure it won't damage female harness plug & then insert - stabilize @ wheel well via zip ties & check with DVOM at Relay Box / BAS-ESP plug 1 or 2 (depending which wheel).

Now I show 1 functioning VSS & 3 dead. Very odd but all 3 were done some months apart from the 1.

Theory: some where an aftermarket supplier made a SNAFU'ED batch of w163 ABS sensors !

Test will reveal - if good continuity on harness wires.

If that's so I'll either need 3 good used VSS OR perhaps 3 OE MB from best source.

I typically try FCP Euro for oe parts.

Thanks to you & everyone here for input - y'all are MB Legends !

David in East Texas

PS:
Kustom1911 - are you a shooter or a gunsmith ? My son aspires to be one...
 

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2004 CLK500 (Wifes), (2) 2005 ML500SE, 2004 ML500, 2000 ML320, 2002 ML320
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David, Looks like Deplore called it correct on the 3 dead ABS sensors.

When I search for ideas or problems on this 163 forum, we are very lucky to have all the
talent and their patience.

PS: best regards for your Son's aspirations, my late uncle was a machinist / gunsmith who
specialized in 1860 - 1890 revolvers. I on the other hand like 100 year old design semi-autos,
and practice wearing firearms out whenever I get the chance.
 

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Discussion Starter #93
Thank you.
Yes Deplore will probably be proved right as soon as I carve time out to lay hands on my ML for testing.

We live far from any pick n pulls - I doubt our tiny junkyard has any w163s.

Just the same - can anyone say if these ABS sensors are same for all 98-2005 models ?
 

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1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG
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Should be, I don't recall any major changes to the axle or knuckle that nessitates a different sensor.

MB is usually pretty good about keeping common parts the same throughout the gen...
 

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Thank you.
Yes Deplore will probably be proved right as soon as I carve time out to lay hands on my ML for testing.

We live far from any pick n pulls - I doubt our tiny junkyard has any w163s.

Just the same - can anyone say if these ABS sensors are same for all 98-2005 models ?
1998-2002 are same. Part number changes for 2003-2005.
 

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1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG
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I stand corrected.
 

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Discussion Starter #98 (Edited)
Hello All,

I ordered all 3 of the 'bad / suspected bad' sensors from Amazon.

1 has already tested 1.0 ohms so it's bad, the other 2 (front axle) I'll pull & test them directly. I think my wiring harness is fine - I was just so not ready to think one could buy 3 New (aftermarket) parts DEFECTIVE.

So the BenzWorld algorithm popped up a near identical thread from 'Stelje' - a European member who had the same codes as my ML500 same symptoms on his ML430 - 3 light salute, beeping & stuck in limp mode.

Prior owner had replaced 2 or 3 wheel speed sensors then got frustrated with the continued codes & sold him the rig for $1000 due to the continuing problems. Some of you here, helped him last year and I think I bought some of the same defective batch of wheel speed sensors as he had:

Here's his thread from last year - his post # 15 sums it up:


Here's the listing from Amazon for the sensors I bought. I will physically look on the sensor body & wire to see if any manufacturing marks are on them.

Order detailsOrdered on March 10, 2020 (3 items)
for Mercedes W163 ML320 ML500 Passenger Rear Right ABS Position Sensor 1635422118
RPG
Sold by: RPG Corp

Buy it again




Order detailsOrdered on March 10, 2020 (3 items)
Front Left ABS Wheel Speed Position Sensor for Mercedes-Benz W163 ML320 ML350 1635421818
RPG
Sold by: RPG Corp

Buy it again




Order detailsOrdered on March 10, 2020 (3 items)
Front Right ABS Wheel Speed Sensor fits for Mercedes-Benz ML320 ML350 1635421918
RPG
Sold by: RPG Corp

Buy it again
 

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OK. So, let's look at factory footnotes for right rear.

163_540_11_17.png


163_542_21_18.png
 
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Discussion Starter #100 (Edited)
Witek, thanks for that.

My ML500 Chasis # is A319363

It appears I should have had the first one you listed, rather than the second one, for the RR sensor, based on the VIN split you provided.

So, upon re-ordering new sensors, I'll make sure to remedy that.

This time, I will measure OHMS of the sensor before installation....to be sure.
 
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