6.3 ECU alarms
The ECU generates alarms which are indicated in different ways depending on the equipment configura‐
tion:
• as four-digit code on a PIM
• as alarm text on a display
• as four-digit code on a dialog PC
The four-digit code consists of one letter and three figures:
• The letter encodes when the fault occurred the last time:
A = currently present
B = within the last operating hour
C = one to four operating hours ago
D = four to twelve operating hours ago
Alarms that occurred more than twelve hours ago are deleted automatically.
• The three figures encode the fault itself as listed in the table below.
Alarms can also be caused by defective sensors / actuators. If troubleshooting in accordance with the
following table is not successful, contact Service to have the sensors / actuators checked and, if re‐
quired, replaced.
Fault
code
Alarm text
Meaning
Task
004
L2 T-FUEL
Fuel temperature too high
(2nd limit)
Cool fuel tank.
005
L1 T-CHARGE
AIR
Charge-air temperature too
high (1st limit)
Reduce power.
006
L2 T-CHARGE
AIR
Charge-air temperature too
high (2nd limit)
Reduce power.
009
L1 T-INTER‐
COOLER
Charge-air coolant tempera‐
ture too high (1st limit)
Reduce power.
015
L1 P-LUBE OIL
Lube-oil pressure too low (1st
limit)
Check engine-oil level and top up, if re‐
quired (→ Page 123);
MS150025/02E 2012-10 | Troubleshooting | 73
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