BMW MSV90 DME Repair Tips

 How to repair BMW (N52 engine) Siemens/Continental MSV90 DME?

First of all, check the MSV90 DME internal components:

1.  DME internal error 

• Software Issues:

  Software errors within the MSV90 module can lead to incorrect engine operation, potentially causing the “internal fault” error.

• Programming Errors:
• If the ECU’s programming is corrupted or improperly configured, it can result in a “syntax error” and trigger the fault code.

If have an internal error on MSV90, most internal faults are caused by poor soldering (cold joints) on this CPU. Simply re-solder the chip will resolve the issue.

For syntax/communication errors: Re-solder the CPU or perform reprogramming of both the Engine ECU and CAS module. There are many tools to read this ECU, OBDSTAR DC706, CG FC200, Yanhua ACDP, Xhorse Multi Prog etc.

2. BSD failure

2E7C BSD communication fault.

The DME (Digital Motor Electronics) MSV90 BSD (Bit-Serial Data Interface) is a crucial component of your BMW’s engine management system. Breakdowns in this system can cause various issues, such as poor engine performance and misfires.

To repair BSD failure issue, need to drill a hole on the MSV90 DME board.  Replace the TJA1020 IC chip within the marked area.

3. Barometric Pressure Sensor Signal Fault

Fault code: P2227

Re-solder SMD288 PIN marked red below.

4. Throttle Fault code

Re-solder or replace ATIC61D3 control IC
Check the transistor for burn damage; replace if faulty.

5. Terminal 15 (KL.15) fault code

1B5102 fault code: specifically a fault related to Terminal KL.15, indicates a problem with the ignition power supply or the ignition switch.

A fault with MSV90 Terminal KL.15 (also known as Terminal 15) on a BMW, specifically in the context of an MSV90 ECU (Engine Control Unit), usually indicates a problem with the ignition or power supply to the ECU.It can manifest as no voltage at the DME input despite the main relay being enabled, or a disruption in the CAS (Car Access System) power supply. The root cause can range from a low battery, an unauthorized consumer drawing power, or a problem with the CAS module.

 

To solve the KL.15 fault, re-solder the fuel injector/fan integrated chip ATIC94D marked red below.

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