MTU 12 V 2000 P12 Operating Instructions Manual page 68

Fault code
122
134
136
139
140
142
144
145
146
147
148
149
150
151
186
68 | Troubleshooting | MS150025/02E 2012-10
Fault message Meaning
L1 T-ELECTRONIC Temperature in ECU hous‐
ing too high (1st limit value)
15V POS ECU DE‐ Internal voltage (-15 VDC)
FECT faulty;
automatic engine shut‐
down.
15V NEG ECU DE‐ Internal voltage (-15 VDC)
FECT missing;
automatic engine shutdown
L1 TE BUFFER Temperature sensor supply
TEST voltage faulty.
TE BUF. ECU DE‐ Temperature sensor supply
FECT voltage faulty.
BANK1 ECU DE‐ Power output stage for
FECT control of solenoid valves
on bank 1 is faulty;
engine does not start.
BANK2 ECU DE‐ Power output stage for
FECT control of solenoid valves
on bank 2 is faulty;
engine does not start.
15V_GOOD ECU Power supply is faulty;
DEFECT
automatic engine shut‐
down.
L1 AD-TEST1 SUP‐ A/D converter supply volt‐
PLY age too low.
AD-TEST1 ECU DE‐ Electronics faulty;
FECT
automatic engine shut‐
down.
L1 AD-TEST2 SUP‐ A/D converter supply volt‐
PLY age too low.
AD-TEST2 ECU DE‐ Internal electronics faulty;
FECT
automatic engine shut‐
down.
L1 AD-TEST3 SUP‐ Internal electronics faulty;
PLY automatic engine shut‐
down.
AD-TEST3 ECU DE‐ Internal electronics faulty;
FECT
automatic engine shut‐
down.
CAN 1 BUS OFF CAN 1 in Bus-Off state:
• Either short circuit on
• Or strong magnetic
bus.
fields disrupting bus.
Action
1. Improve engine room ventila‐
tion.
2. Reduce engine power.
Replace engine governor (→ En‐
gine operating instructions).
Contact Service.
Contact Service.
• Check sensors;
• replace engine governor.
Contact Service.
• Check sensors;
• replace engine governor.
Replace engine governor (→ En‐
gine operating instructions).
Replace engine governor (→ En‐
gine operating instructions).
Replace engine governor (→ En‐
gine operating instructions).
Replace engine governor (→ En‐
gine operating instructions).
Replace engine governor (→ En‐
gine operating instructions).
Replace engine governor (→ En‐
gine operating instructions).
Replace engine governor (→ En‐
gine operating instructions).
Replace engine governor (→ En‐
gine operating instructions).
Replace engine governor (→ En‐
gine operating instructions).
Contact Service.
• Check CAN bus for short circuit,
rectify short circuit as necessary.
• Check shielding, improve shield‐
ing as necessary.