Fault code
Fault message
Meaning
Action
122
L1 T-ELECTRONIC
Temperature in ECU hous‐
ing too high (1st limit value)
1. Improve engine room ventila‐
tion.
2. Reduce engine power.
134
15V POS ECU DE‐
FECT
Internal voltage (-15 VDC)
faulty;
automatic engine shut‐
down.
Replace engine governor (→ En‐
gine operating instructions).
136
15V NEG ECU DE‐
FECT
Internal voltage (-15 VDC)
missing;
automatic engine shutdown
Contact Service.
139
L1 TE BUFFER
TEST
Temperature sensor supply
voltage faulty.
Contact Service.
• Check sensors;
• replace engine governor.
140
TE BUF. ECU DE‐
FECT
Temperature sensor supply
voltage faulty.
Contact Service.
• Check sensors;
• replace engine governor.
142
BANK1 ECU DE‐
FECT
Power output stage for
control of solenoid valves
on bank 1 is faulty;
engine does not start.
Replace engine governor (→ En‐
gine operating instructions).
144
BANK2 ECU DE‐
FECT
Power output stage for
control of solenoid valves
on bank 2 is faulty;
engine does not start.
Replace engine governor (→ En‐
gine operating instructions).
145
15V_GOOD ECU
DEFECT
Power supply is faulty;
automatic engine shut‐
down.
Replace engine governor (→ En‐
gine operating instructions).
146
L1 AD-TEST1 SUP‐
PLY
A/D converter supply volt‐
age too low.
Replace engine governor (→ En‐
gine operating instructions).
147
AD-TEST1 ECU DE‐
FECT
Electronics faulty;
automatic engine shut‐
down.
Replace engine governor (→ En‐
gine operating instructions).
148
L1 AD-TEST2 SUP‐
PLY
A/D converter supply volt‐
age too low.
Replace engine governor (→ En‐
gine operating instructions).
149
AD-TEST2 ECU DE‐
FECT
Internal electronics faulty;
automatic engine shut‐
down.
Replace engine governor (→ En‐
gine operating instructions).
150
L1 AD-TEST3 SUP‐
PLY
Internal electronics faulty;
automatic engine shut‐
down.
Replace engine governor (→ En‐
gine operating instructions).
151
AD-TEST3 ECU DE‐
FECT
Internal electronics faulty;
automatic engine shut‐
down.
Replace engine governor (→ En‐
gine operating instructions).
186
CAN 1 BUS OFF
CAN 1 in Bus-Off state:
• Either short circuit on
bus.
• Or strong magnetic
fields disrupting bus.
Contact Service.
• Check CAN bus for short circuit,
rectify short circuit as necessary.
• Check shielding, improve shield‐
ing as necessary.
68 | Troubleshooting | MS150025/02E 2012-10
TIM-ID: 0000008959 - 001