2010 BMW 128i Convertible (E88) L6-3.0L (N52K) Manufacturer Code Page 49
Condition for fault memory entry
Yes, by event counter. Fault must occur ten times before a
fault memory entry is made.
Action in service
Determine whether fault is stored again after carrying out
the following procedure. If yes: Replace DME.
1. Clear fault memory
2. Ignition off, allow vehicle to assume complete dormant
status
3. Ignition on
4. Read out stored fault codes from fault memory
Fault effect and breakdown warning
Driver information
Warning light:
No warning message. No control activation possible from
some DME output terminals.
Service instruction
none
2ACB – P0686 (DME)
2ACB – P0686
Information saved in
DME
Fault code
2ACB – P0686
Fault text
DME master relay, activation
Fault description
ECM/PCM Power Relay Control Circuit Low
Condition for fault identification
Test condition:
Main relay monitoring
Main relay must have opened.
Terminal condition: First Terminal 15 OFF
(wait until main relay opens)
then Terminal 15 ON
(and leave ON)
Voltage condition:
Voltage in onboard electrical system > 10 V
Condition for fault memory entry
none
Action in service
1 Check wiring
Repair if defective
If wiring is OK proceed
to check component
Fault effect and breakdown warning
