MTU 12 V 4000 G73 Operating Instructions Manual page 52

120 – HI ECU Power Supply Voltage
Cause
Supply voltage too high
(1st limit value).
121 – HIHI ECU Power Supply Voltage
Cause
Supply voltage too high (2nd
limit value). automatic engine
shutdown (configurable).
122 – HI T-ECU
Cause
Temperature in the ECU housing
too high (1st limit value).
134 – 15V POS ECU DEFECTIVE
Cause
Internal voltage (-15 VDC)
defective; automatic engine
shutdown.
136 – 15V NEG ECU DEFECTIVE
Cause
Internal voltage (-15 V DC)
missing; automatic engine
shutdown.
139 – L1 TE BUFFER TEST
Cause
Supply voltage of temperature
sensors faulty.
52 | Troubleshooting | MS150029/02E 2013-03
ZKP-Number: 2.0140.931
Corrective action
1. Check supply voltage of engine governor.
2. Contact Service.
ZKP-Number: 2.0140.932
Corrective action
1. Check supply voltage of engine governor.
2. Contact Service.
ZKP-Number: 2.0132.921
Corrective action
1. Improve engine room ventilation.
2. Reduce power.
ZKP-Number: -
Corrective action
u Replace engine governor.
ZKP-Number: -
Corrective action
u Contact Service.
ZKP-Number: -
Corrective action
1. Check sensors.
2. Replace engine governor.
3. Contact Service.