MTU 20V4000L33F Operating Instructions Manual page 118

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.
118 | Troubleshooting | MS150108/02E 2015-03
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 141).
3. Check combustion chamber.
4. Check gas quality if feasible (methane number).
Corrective action
1. Check emissions.
2. Check ignition timing (→ Page 141).
3. Check combustion chamber.
4. Check gas quality if feasible (methane number).
Corrective action
1. Check emissions.
2. Check ignition timing (→ Page 141).
3. Check combustion chamber.
4. Check gas quality if feasible (methane number).