MTU 12 V 4000 G73 Operating Instructions Manual page 48

Fault code
No.
121
122
134
136
139
140
142
144
145
146
147
148
149
150
151
176
48 | Troubleshooting | MS150054/02E 2012-02
Designation
HIHI ECU Power Sup‐
ply Voltage
HI T-ECU
15V POS ECU DE‐
FECT
15V NEG ECU DE‐
FECT
L1 TE BUFFER TEST
TE BUF. ECU DEFECT
BANK1 ECU DEFECT
BANK2 ECU DEFECT
15V_GOOD ECU DE‐
FECT
L1 AD-TEST1 SUPPLY
AD-TEST1 ECU DE‐
FECT
L1 AD-TEST2 SUPPLY
AD-TEST2 ECU DE‐
FECT
L1 AD-TEST3 SUPPLY
AD-TEST3 ECU DE‐
FECT
AL LifeData not availa‐
ble
Meaning
Supply voltage too high
(2nd limit value); automatic
engine shutdown (configu‐
rable).
Temperature in ECU hous‐
ing too high (1st limit value).
Internal voltage (-15 VDC)
faulty; automatic engine
shutdown.
Internal voltage (-15 VDC)
missing; automatic engine
shutdown.
Supply voltage of tempera‐
ture sensors faulty.
Supply voltage of tempera‐
ture sensors faulty.
Power output stage for con‐
trol of the solenoid valves
on bank 1 is faulty; Engine
does not start.
Power output stage for con‐
trol of the solenoid valves
on bank 2 is faulty; Engine
does not start.
Power supply faulty; auto‐
matic engine shutdown.
Supply voltage A/D convert‐
er too low.
Electronic fault; automatic
engine shutdown.
Supply voltage A/D convert‐
er too low.
Internal electronic fault; au‐
tomatic engine shutdown.
Internal electronic fault; au‐
tomatic engine shutdown.
Internal electronic fault; au‐
tomatic engine shutdown.
Alarm configuration; No (ap‐
propriate) LifeData backup
system available, ECU re‐
set after expiration of time-
out period.
Related
parameter
Task No.
Check ECU supply
voltage.
2.0140.93
Contact Service. 2
1. Improve engine
room ventilation.
2.0132.92
2. Reduce power. 1
Replace engine
governor.
Contact Service.
Contact Service.
Check sensors;
Replace engine
governor.
Contact Service.
Check sensors;
Replace engine
governor.
Replace engine
governor.
Replace engine
governor.
Replace engine
governor.
Replace engine
governor.
Replace engine
governor.
Replace engine
governor.
Replace engine
governor.
Replace engine
governor.
Replace engine
governor.
2.4000.00
Contact Service. 4