[dfleck63]

Can anyone recommend a company that can repair the ABS Control Computer on a 1999 E300?

Part number: 003-431-30-12

I've replaced all four speed sensors and front hubs and the system still fails.

Thanks,

Dave

 

[mrboca]

Can anyone recommend a company that can repair the ABS Control Computer on a 1999 E300?

Part number: 003-431-30-12

I've replaced all four speed sensors and front hubs and the system still fails.

Thanks,

Dave

What is the fault code? The part you mentioned is the ABS pump. The traction control module provides the fault codes, if you have a scanner that can scan the individual modules.

 

[felixw]

I have used this compnay but not on that specifc unit ap-reman.com

 

[dfleck63]

It doesn’t show a code on my diagnostic computer. The ABS light illuminates along with the failure message.

 

[mrboca]

Then how did you determine that the ABS pump (hydraulic unit) is bad? You can have the ABS warning for many different reasons. You need a scanner that can access the Traction module from the 38-pin diagnostic port under the hood. Or have it scanned at a repair shop which has the proper scanner for Mercedes (with 38-pin adapter cable).

 

[dfleck63]

It was just in a good shop and they decided that the ABS Controller was at fault. The MB dealerships won’t touch it since my car too old. So now I’m left with sending the ABS Controller off. I’ve plugged my Snap On diagnostic computer into the 38 pin plug and could not access any ABS codes. My diagnosis computer is a good 15 years old, though. I’ve talked to several companies who repair automotive components computers and they won’t work on something this old. Unfortunately these cars are becoming so old that fewer and fewer people want to work on them.

 

[dfleck63]

It was just in a good shop and they decided that the ABS Controller was at fault. The MB dealerships won’t touch it since my car too old. So now I’m left with sending the ABS Controller off. I’ve plugged my Snap On diagnostic computer into the 38 pin plug and could not access any ABS codes. My diagnosis computer is a good 15 years old, though. I’ve talked to several companies who repair automotive components computers and they won’t work on something this old. Unfortunately these cars are becoming so old that fewer and fewer people want to work on them.

 

[dfleck63]

I disconnected a speed sensor and when the car was turned on, the ABS fault occurred immediately. With the sensor plugged in, there are no faults until the vehicle starts moving. Then the ABS light illuminates and the ABS, Traction and BAS failures show up on the display.

 

[dfleck63]

This car has 723,952 miles on it.

 

[mrboca]

The ABS pump has the solenoid valves, High pressure ABS pump, and some logic. No scanner can reach the ABS pump as it does not have a diagnosis port.

I assume your car has ASR traction module, not the ESP. In this case fault codes are obtained from the ASR module. Some scanners can access the ASR module (like MB Star), and some cannot. The ASR module drives the ABS solenoid valves, and detect if there are shorts or opens, and generate fault codes accordingly. The codes go like CXXXXX, C means Chassis.

Typically, the ABS pump motor gets seized up, and this is detected immediately by the traction module.

I think it is something related to speed sensor(s), wiring, or the traction module as the speed sensor information is received by the traction module and sent to other modules like the TCM, ECU / IFI. That is why it is important find the problem from the traction module scan.

STAR TekInfo

 

[dfleck63]

Maybe there is a shop in the Dallas, Texas area that has the ability to scan for failure codes. None of the Dealerships will touch it. I bought this car new and it hasn’t been flooded or wrecked. The ABS failure just popped up one day.

 

[mrboca]

Maybe @Witek_M can help you out.

 

[dfleck63]

Are they a shop in Dallas?

 

[MBGraham]

When I had a similar problem some years back, I had my car scanned by an Indy shop. Results were not very helpful! Described here. I did my own search and I think it was the P1401 code that suggested it could be the ABS pump. Here is a post I made back then:

If you think it could be ABS pump, there is something you might try.

What goes wrong with the pump, is that the brushes in the pump motor wear down and no longer make proper contact. An electrical motor repair shop might be able to repair a pump. It is no big deal.

Each time you start the car, the computer checks to see if the ABS system is working. To do this it tries to run the pump. If pump doesn't run. you get the ABS and other lights.

I found that I could get the pump to run by tapping it with a rubber mallet or something like that. Best to do it while someone turns key on and keep doing it for a minute or two. You may hear the pump run. In fact you should listen to see if pump runs first. If it does, problem is likely elsewhere.

Regarding code readers, I don't think any OBD2 meters will read the relevant codes. You need to have a Star type system. Even then, the codes will be cryptic, because there are a number of inter-related systems which affect each other. However, if it is a wheel sensor, I think you get a specific code.

When I had similar lights, I did following:

• changed brake light switch (made no difference)
• Had codes read by Indy. He had no clue, but I had him give me the codes.
• With codes, searched internet including here!
• Finally found some stuff on ABS pump brushes.
• Bought used pump and installed.

No lights since! And ABS does work.

There is more in that thread: Dreaded ABS BAS light

Also in this thread: BAS, ASR, ABS Lights on, w/C1401 code

Funnily enough, we went out to a dinner last Friday. Roads were slippery. I twice had to brake hard. Both times the ABS worked as it should. The chattering is always a bit of a surprise when it does!

That $50 eBay used pump bought 10+ years ago has worked out well for me

 

[mrboca]

C1401 is the circuit fault for the ABS pump. The monitoring of the ABS pump is done by the Traction module. If this code comes up it is clearly the ABS pump. However, if no faults while the car is not moving, and warning lights coming on when the car moves, sounds like something else.

 

[MBGraham]

C1401 is the circuit fault for the ABS pump. The monitoring of the ABS pump is done by the Traction module. If this code comes up it is clearly the ABS pump. However, if no faults while the car is not moving, and warning lights coming on when the car moves, sounds like something else.

In my case, it was the pump itself. (Or more specifically, the pump motor brushes). But it could also be the pump's wiring or the pump relay (easy to check)

 

[mrboca]

Are they a shop in Dallas?

You can get cheap Autel scanner with 38-pin Autel adapter to access the fault codes from BAS and ASR modules:

Status report
VIN: WDBJF65XXXXXXXXXX
Diagnostics time: 2020/11/22 11:52
Path: Automatic selection > Auto scan >

System name DTC counts Status
ME2-SFI-Motor electronics 2 01 Fault
ETC-Electronic transmission control 0 Pass
ASR-Acceleration Slip Regulation 0 Pass
AB-Airbag 0 Pass
ICM-Instrument cluster with maintenance interval display 0 Pass
BAS-Brake assist 0 Pass
EZS-Electronic ignition switch 0 Pass
OCP-Overhead control panel 0 Pass
LCP-Lower control panel 0 Pass
PSE-Pneumatic system equipment 0 Pass
SAM-Signal acquisition and actuation module 0 Pass
DCM1-Door control module front driver side 0 Pass
DCM2-Door control module front passenger side 0 Pass
DCM3-Door control module rear driver side 0 Pass
DCM4-Door control module rear passenger side 0 Pass
ESA-FL-Electric seat adjustment front left 0 Pass
ESA-FR-Electric seat adjustment front right 0 Pass
AAC-Automatic air conditioning 0 Pass
Autel VEHICLE DIAGNOSTIC REPORT

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