MTU 20V4000Lx2x Operating Instructions Manual page 120

569 – AL SAM Missing Data Fault
Red alarm.
Associated parameter 2.1090.128
Cause
This alarm is activated if the ECU
does not receive some messages
to be transmitted from SAM.
Possible problem related to CAN
bus, SAM does not work properly
or a device connected to SAM
does not work properly so that
SAM cannot transmit the
messages from this device
successfully.
570 – L1 Al CAN Max. Retarded Timing
Yellow alarm.
Associated parameter 2.1200.931
Cause
The cylinder set to maximum
retarded timing due to knocking
has violated the first limit value.
571 – L2 Al CAN Max. Retarded Timing
Yellow alarm. Power reduction.
Associated parameter 2.1200.932
Cause
The cylinder set to maximum
retarded timing due to knocking
has violated the second limit
value. Power reduction is initiated.
572 – L3 Al CAN Max. Retarded Timing
Red alarm. Engine shutdown.
Associated parameter 2.1200.933
Cause
The cylinder set to maximum
retarded timing due to knocking
has violated the third limit value.
120 | Troubleshooting | MS150122/00E 2015-07
Corrective action
u Check the cabling/connectors of the devices connected to SAM
and ECU bus. Replace devices as necessary.
Corrective action
1. Check emissions.
2. Check ignition timing (→ Page 143).
3. Check combustion chamber.
4. Check gas quality if feasible (methane number).
Corrective action
1. Check emissions.
2. Check ignition timing (→ Page 143).
3. Check combustion chamber.
4. Check gas quality if feasible (methane number).
Corrective action
1. Check emissions.
2. Check ignition timing (→ Page 143).
3. Check combustion chamber.
4. Check gas quality if feasible (methane number).