ABS Computer Repair Help

469 Views 16 Replies 4 Participants Last post by mrboca, 4 mo ago

dfleck63

Discussion Starter · 4 mo ago

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

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mrboca

· #2 · 4 mo ago

dfleck63 said:
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.

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mrboca

· #5 · 4 mo ago

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).

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mrboca

· #10 · 4 mo ago

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

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mrboca

· #12 · 4 mo ago

Maybe @Witek_M can help you out.

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mrboca

· #15 · 4 mo ago

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.

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mrboca

· #17 · 4 mo ago

dfleck63 said:
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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