MTU 20 V 4000 G23, Technical Publication

Page: 82 / 178

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