LI09.00-N-054723

Engine in limp-home mode, FC123900
Topic number
LI09.00-N-054723
Version
3
Design group
09.00 General
Date
07-01-2013
Validity
OM642 in MODEL 906
Reason for change
Remedy revised
Reason for block
Complaint:
Engine in limp-home mode
Fault 123900 set in CDI control unit.
Rpm limited to 75% after engine restart.
Cause:
A) Fault thresholds in engine software too low
B) Leakage in air system (intake/exhaust side)
C) High exhaust backpressure
Remedy:
A) Install current engine control unit (CDI) software. (DAS version 03/2013 or higher)
B) If CDI control unit has latest software - check charge air system for leaks (CDI6 common rail - List of all guided
tests - Check charge air system for leaks)
(See also SDmedia "AR Check charge air system for leaks")
C) If there are no leaks in the charge air and exhaust systems - check / verify exhaust back pressure
- Should the problem re-occur after the above remedies are applied please create a PTSS case and attach the following documents:
1. Quick Test
2. CDI6 control unit log
3. Performance data
4. Engine repair history (with part numbers and exchange dates)
5. Customer statement on occurrence of problem
07-01-2013 10:29 PM
© Copyright Daimler AG
DAVANDE
Page 1/2
Symptoms
Power generation / Engine management / Engine performance / Goes into limp-home mode
Power generation / Engine management / Engine performance / No/poor output
Power generation / Engine management / Engine performance / Poor acceleration
Control unit/fault code
Control unit
Fault code
Fault text
CDI6Common Rail Diesel Injection (CR6NFZ)
123900
Charge pressure is too low.
Work units
Op. no.
Operation text
54-1011
PERFORM QUICK TEST
07-0651
CHECK CHARGE AIR SYSTEM FOR
LEAKS
Time
Damage
code
Note
Validity
Vehicle
Engine
Transmission
Sprinter III
642
*
07-01-2013 10:29 PM
© Copyright Daimler AG
DAVANDE
Page 2/2