MTU 20V4000Lx2x Operating Instructions Manual page 125

655 – AL TecJet Comm Lost
Red alarm.
Associated parameter 1.4540.996
Cause
CAN bus communication for gas
control valve faulty (alternatively,
a stepper motor with gas mixer
can be installed).
656 – AL ProActA Comm Lost
Red alarm.
Associated parameter 1.4550.096
Cause
CAN bus communication for
throttle A faulty.
657 – AL ProActB Comm Lost
Red alarm.
Associated parameter 1.4550.196
Cause
CAN bus communication for
throttle B faulty.
658 – AL NOxA Comm Lost
Red alarm.
Associated parameter 1.4560.096
Cause
CAN bus communication for NOx
sensor A faulty.
659 – AL NOxB Comm Lost
Red alarm.
Associated parameter 1.4560.196
Cause
CAN bus communication for NOx
sensor B faulty.
Corrective action
1. Check cabling.
2. Check power supply.
3. Carry out restart of ECU, EMU & gas control valve.
4. Check settings with device-specific dialog software (XD11).
Corrective action
1. Check cabling.
2. Check power supply.
3. Carry out restart of ECU, EMU & throttle A.
4. Check settings with device-specific dialog software (XD50.1).
Corrective action
1. Check cabling.
2. Check power supply.
3. Carry out restart of ECU, EMU & throttle B.
4. Check settings with device-specific dialog software (XD50.2).
Corrective action
1. Check cabling.
2. Check power supply.
3. Carry out restart of ECU and EMU.
4. Replace sensor.
Corrective action
1. Check cabling.
2. Check power supply.
3. Carry out restart of ECU and EMU.
4. Replace sensor.
MS150122/00E 2015-07 | Troubleshooting | 125