MTU 20V4000L33F Operating Instructions Manual page 102

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).
180 – AL CAN1 Node Lost
Yellow alarm.
Associated parameter 2.0500.680
Cause
Bus node (SAM or EMU) lost on
CAN bus 1.
102 | Troubleshooting | MS150108/02E 2015-03
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.
Corrective action
u Check operation of bus stations and cabling. Buses (CAN bus 1
and CAN bus 2) are redundant.