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7 Troubleshooting
7.1 Fault messages – Key
The fault messages are applicable to 8V, 12V, 16V and 20V engines.
Explanation of the abbreviations used
The following abbreviations are used in the texts for the fault messages:
Abbreviation
Meaning
DL <number>
Default Lost: The device with designation <number> has lost its connec-
tion to the default CAN bus.
RL <number>
Redundant Lost: The device with designation <number> has lost its con-
nection to the redundant CAN bus.
SD <sensor designation>
Sensor defect: The sensor with the designation <sensor designation> is
not sending an analyzable signal.
MD
Missing Data: Data is missing from a measuring point.
AL
Alarm: Alarm message
SS
Safety System: The safety system has reacted in some way.
TD
Transmitter Deviation: Two sensors that record the measured values for
the same medium are sending different measured values.
HI
High: The first limit value has been exceeded.
HIHI
High: The second limit value has been exceeded.
LO
Low: The first limit value has not been attained.
LOLO
Low Low: The second limit value has not been attained.
MG
Message: General message
SE
System Error: Warning due to node failure on the default field bus.
PB
Pushbutton: Status indication due to activation of certain control keys.
AKR
Anti Knock Control GET
Important information about fault messages from the Engine Control Unit /
Engine Monitoring Unit
Fault messages from the Engine Control Unit are represented in the fault code list (→ Page 133).
Information pertaining to alarm colors and automatic engine shutdown in the fault code list refer to the (de-
fault) factory settings of the Engine Control Unit on delivery. Different system response may be possible due
to changes to the genset control system made by the OEM (see documentation of the genset manufacturer).
Appropriate MTU qualifications/training are a requirement for performing troubleshooting activities.
Contact Service should troubleshooting as prescribed in the fault code list prove unsuccessful.
Recommended action in case of alarm
Yellow alarm:
The engine can still be operated providing that automatic engine shutdown to protect the engine has not
been configured or is not tripped. Contact Service immediately/start fault rectification.
Red alarm:
Caution, the engine is operating at its limits. Shut down manually without further delay if the engine does not
shut itself down immediately after a red alarm is signaled.
66 | Troubleshooting | MS150116/04E 2018-04
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