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  #1  
Old 12-02-2014, 12:44 PM
TOMCLARK's Avatar
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Join Date: May 2006
Location: Panama City Beach, FL
Posts: 18
2003 slk230 BAS - ESP light AND Limp mode

I realize that there are a few threads on the ESP BAS lights but my problem is a little different.

I was driving along and the transmission sort of went into neutral It was in drive but when the engine revved it didn't do anything to the speed. I pulled off and as I was slowing down the ESP BAS light came on. I was at idle in Drive and gave it a little gas and it seamed to react fine so I carefully drove it home 10 miles. No problems except the lights on. the next day I started to take the care for a test and the check engine light came on. I did a basic scan that said the speed sensor malfunction. I cleared the code and then started to go for the test ride. NOW the car is in limp mode and won't change gears.

I only have a basic scanner and the only place that has MB specific is to far to drive. I read that the transmission is sensitive to fluid level bit I don't have a dipstick I would like to tell how much fluid is in it.

If I use a wire and bottom it out how far up would the fluid be? this is only till I get the dip stick.

How do I know what transmission is in the car?

Any other thoughts on how to get it out of limp mode to get it to the shop to get the correct codes?

This is my primary driver and would appreciate any help would be appreciated.

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Many Thanks
Tom Clarkson


68 Plymourh Roadrunner 13,000 miles, Purchased new from dealer (waiting for restoration)
77 300D with many 84 parts 260,000 + miles Runs great but looks ratty
84 300SD Turbo 205000 miles
My new Baby 2003 SLK230 135k miles

Last edited by TOMCLARK; 12-02-2014 at 12:52 PM. Reason: added question re tranny
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  #2  
Old 12-02-2014, 07:16 PM
slk230red's Avatar
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Join Date: Jul 2006
Location: Tampa, FL
Posts: 820
I just fixed an ABS/ESP/BAS problem on my 2001 SLK230. The ABS/ESP pump continued to run even with the engine off. C1000 code, diagnostic conclusion stated to replace N47-5 Control Module. I located a used unit and replaced just the control module yesterday and after I installed it, the lights went off and the pump operates normally. I had all stored codes cleared today with a Star diagnostic tool.

Before doing this, I tested each wheel speed sensor and found that the Left Rear had a flaky reading. I believe this was causing intermittent ESP/BAS lights to come on over the last few months. The other 3 measured 3.9 Meg ohms at each sensor. Replaced the left rear sensor and moved on to the brake job. I replaced the front rotors, wear pad sensors, and front and rear pads. I also gave the tone rings a good cleaning for the wheel sensors.

If you want to measure the wheel speed sensors without removing the wheels, you can disconnect the connector at the ABS/ESP control module and measure across these pin numbers. If you don't get a reading, reverse the meter leads.

Left Front, pins 3 & 4
Right Front, pins 32 & 33
Left Rear, pins 6 & 7
Right Rear, pins 34 & 35

I just went out to the garage, and my measurements are around 3.4 to 3.7 Meg ohms at the connector for each sensor.




Here is a reference for the dipstick tool. I used a plastic coated stranded wire and made the min. and max. marks to measure my transmission fluid.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible
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  #3  
Old 12-02-2014, 10:26 PM
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I wouldn't guess on that. Get a scan done along with the trans values. From what you're describing, and the generic speed sensor code, I'd be willing to bet you have a bad conductor plate....
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  #4  
Old 12-03-2014, 09:56 AM
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Location: Panama City Beach, FL
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Thank you both for the quick replies. I will check out the wheel sensors this morning and I'm going to try to make a temporary dip stick. Does anyone know where to get a service book for the SLK I tried on a lot of sites but no one has anything for the SLK.
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Many Thanks
Tom Clarkson


68 Plymourh Roadrunner 13,000 miles, Purchased new from dealer (waiting for restoration)
77 300D with many 84 parts 260,000 + miles Runs great but looks ratty
84 300SD Turbo 205000 miles
My new Baby 2003 SLK230 135k miles
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  #5  
Old 12-03-2014, 10:38 AM
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Location: Panama City Beach, FL
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OK I just made a dipstick from some twisted bailing wire. I slid it down the ATF tube till it bottomed out Which was at 28.5" and pulled it out NO ATF ! that was cold without the engine running. With the engine cold, running in park STILL NO FLUID, I guess I'll start there.
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Many Thanks
Tom Clarkson


68 Plymourh Roadrunner 13,000 miles, Purchased new from dealer (waiting for restoration)
77 300D with many 84 parts 260,000 + miles Runs great but looks ratty
84 300SD Turbo 205000 miles
My new Baby 2003 SLK230 135k miles
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  #6  
Old 12-03-2014, 01:17 PM
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Location: Panama City Beach, FL
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Thumbs up * * * SOLVED * * *

* * * SOLVED * * *

OK just Filled the Transmission to about the proper amount. I put the car in Drive and reverse to circulate the fluid. I backed out of the drive and as soon as it shifted both lights went out . I don't know where the fluid went but with 130K on it I will be a happy camper. Grand total 4 Qts ATF.

Thank you SLK 230red The dip stick that you posted worked great. I could not have done it without you! and to Paul I will be going to the shop and getting a diag. of all systems. The main thing now, is that it's not in Limp mode so I can drive it to the shop.

Now I can order the dipstick and be sure of the level. I can't believe that MB didn't put one in and lock it like the cover.

Thanks guys
__________________
Many Thanks
Tom Clarkson


68 Plymourh Roadrunner 13,000 miles, Purchased new from dealer (waiting for restoration)
77 300D with many 84 parts 260,000 + miles Runs great but looks ratty
84 300SD Turbo 205000 miles
My new Baby 2003 SLK230 135k miles
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  #7  
Old 01-13-2015, 02:40 PM
TOMCLARK's Avatar
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Join Date: May 2006
Location: Panama City Beach, FL
Posts: 18
NOT SOLVED

Update on the slk 230 * * * After putting in the new conductor plate and refilling the fluid it worked fine except the lights. I took it to the shop and did a full scan and about 8 pages of fault codes came out. They cleared the codes and everything was fine till I moved the car. I went around the block and the check engine came on we then ran the codes again and the only codes were

ETC
P2401 left rear wheel rpm signal is implausible

ESM
P1861 same detail as above

ME-SFI Can message from control module ESP . Vehicle speed signal implausible (P0500)

ESP
C1102-004 l6/3 (left rear speed sensor) loose contact

BAS
C1025-002 CAN bus: CAN message ABS is faulty

plus a couple of codes not related Like gps antenna and alarm horn .

I ordered a new Left rear wheel rpm sensor but have not received it.

2 Questions 1 is the wiring to the RPM sensors in the long narrow connector in front of the break hoses?
second is where is the TCM located so I can check if there is any fluid that migrated into that, there was a lot of leaking around the seal that connects to the connector plate.

thanks for helping as I can't find a manual for this car.
__________________
Many Thanks
Tom Clarkson


68 Plymourh Roadrunner 13,000 miles, Purchased new from dealer (waiting for restoration)
77 300D with many 84 parts 260,000 + miles Runs great but looks ratty
84 300SD Turbo 205000 miles
My new Baby 2003 SLK230 135k miles
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  #8  
Old 01-14-2015, 12:06 PM
slk230red's Avatar
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Join Date: Jul 2006
Location: Tampa, FL
Posts: 820
Quote:
Originally Posted by TOMCLARK View Post
I went around the block and the check engine came on we then ran the codes again and the only codes were

ETC
P2401 left rear wheel rpm signal is implausible

ESM
P1861 same detail as above

ME-SFI Can message from control module ESP . Vehicle speed signal implausible (P0500)

ESP
C1102-004 l6/3 (left rear speed sensor) loose contact

BAS
C1025-002 CAN bus: CAN message ABS is faulty

plus a couple of codes not related Like gps antenna and alarm horn .

I ordered a new Left rear wheel rpm sensor but have not received it.

2 Questions 1 is the wiring to the RPM sensors in the long narrow connector in front of the break hoses?
second is where is the TCM located so I can check if there is any fluid that migrated into that, there was a lot of leaking around the seal that connects to the connector plate.

thanks for helping as I can't find a manual for this car.
Hi Tom, yes you can measure your wheel speed sensors at the ABS/ESP module connector that is next to the pump motor. The cover has a locking clip on the bottom, when you release one side, you should be able pull up on the cover/lever and it will ease out. The cover pivots at the top of the connector and when you re-install the connector, you will need push down on the cover to lock it.

Here are the pinout numbers at the connector.

Left Front, pins 3 & 4
Right Front, pins 32 & 33
Left Rear, pins 6 & 7
Right Rear, pins 35 & 36

If you don't get a resistance reading, reverse the VOM leads. I would also check the connection at the wheel where it goes into the wheel well and measure the sensor.

I had a P0500 code and replaced the left rear speed sensor due to bad resistance readings. After replacing the sensor, I was able to clear the DTC with my code scanner.

I believe the TCM is located under the passenger side floor carpet. I have pictures of all the stuff that is under there if you need to see it.

Good luck,

Dave
__________________

1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible
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  #9  
Old 01-15-2015, 01:37 PM
TOMCLARK's Avatar
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Join Date: May 2006
Location: Panama City Beach, FL
Posts: 18
Dave, I was able to replace the rpm sensor and I checked the resistance all within specs. I REALIZED THAT I DIDN'T HAVE THEW CLIP ON THE CONNECTION and that is what was giving me all of the funky codes. I cleared the codes and drove the car, like new and no codes other than the tranny . Thanks for your help. setting up an appointment to have the tranny codes cleared tomorrow.

__________________
Many Thanks
Tom Clarkson


68 Plymourh Roadrunner 13,000 miles, Purchased new from dealer (waiting for restoration)
77 300D with many 84 parts 260,000 + miles Runs great but looks ratty
84 300SD Turbo 205000 miles
My new Baby 2003 SLK230 135k miles
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