MTU 20 V 4000 G23 Technical Publication page 82

Troubleshooting
Fault
code No. Designation
119 LOLO ECU Supply
Voltage
120 HI ECU Supply Voltage
121 HIHI ECU Supply
Voltage
122
HI T-ECU
134 15V POS ECU DEFECT
136 15V NEG ECU DEFECT
139 L1 TE BUFFER TEST
140 TE BUF. ECU DEFECT
142 BANK1 ECU DEFECT
144 BANK2 ECU DEFECT
15V_GOOD ECU
145 DEFECT
146 L1 AD-TEST1 SUPPLY
AD-TEST1 ECU
147 DEFECT
148 L1 AD-TEST2 SUPPLY
M015715/00E 06-08
Meaning
Alarm configuration limit value
2; Main warning: Supply
voltage too low.
Alarm configuration limit value
1; Preliminary warning: Supply
voltage too high.
Alarm configuration limit value
2; Main warning: Supply
voltage too high.
Alarm configuration limit
value 1; Preliminary warning:
Temperature in ECU too high.
Internal voltage (-15 VDC)
faulty; automatic engine
shutdown.
Internal voltage (-15 VDC)
missing; automatic engine
shutdown.
Supply voltage of temperature
sensors faulty.
Supply voltage of temperature
sensors faulty.
Power output stage for control
of the solenoid valves on bank
1 is faulty; Engine does not
start.
Power output stage for control
of the solenoid valves on bank
2 is faulty; Engine does not
start.
Power supply faulty; automatic
engine shutdown.
Supply voltage A/D converter
too low.
Electronic fault; automatic
engine shutdown.
Supply voltage A/D converter
too low.
Task
1. Check ECU
supply voltage.
2. Contact
Service.
1. Check ECU
supply voltage.
2. Contact
Service.
1. Check ECU
supply voltage.
2. Contact
Service.
1. Reduce power.
2. Improve
engine room
ventilation.
Replace ECU.
Contact Service.
1. Check sensors.
2. Replace ECU.
3. Contact
Service.
1. Check sensors.
2. Replace ECU.
3. Contact
Service.
Replace ECU.
Replace ECU.
Replace ECU.
Replace ECU.
Replace ECU.
Replace ECU.
77
Related
parameter No.
2.0140.922
2.0140.931
2.0140.932
2.0132.921
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