MTU 12 V 4000 L62FB Operating Instructions Manual page 99

118 – LO ECU Power Supply Voltage
Yellow alarm.
Associated parameter 2.0140.921
Cause
Supply voltage too low (limit value
1)
119 – LOLO ECU Power Supply Voltage
Red alarm.
Associated parameter 2.0140.922
Cause
Supply voltage too low (limit value
2)
120 – HI ECU Power Supply Voltage
Yellow alarm.
Associated parameter 2.0140.931
Cause
Supply voltage too high (limit
value 1)
121 – HIHI ECU Power Supply Voltage
Red alarm.
Associated parameter 2.0140.932
Cause
Supply voltage too high (limit
value 2)
122 – HI T-ECU
Yellow alarm.
Associated parameter 2.0132.921
Cause
Electronics temperature too high
(limit value 1).
Corrective action
1. Check supply voltage.
2. Check cabling.
Corrective action
1. Check supply voltage.
2. Check cabling.
Corrective action
1. Check supply voltage.
2. Check cabling.
Corrective action
1. Check supply voltage.
2. Check cabling.
Corrective action
u Provide improved cooling for ECU. Reduce room temperature,
check air flow to ADEC.
MS150098/02E 2016-11 | Troubleshooting | 99