Indication on LDU
Possible cause
Procedure
TE3745C
Temperature sensor fails to mea-
sure the exhaust gas temperature at
SCR reactor inlet.
Status bit for hardware signal failure:
Temperature sensor TE3746C.
•
Re-establish the cabling X41-5/6
to MCM E70.
•
Replace the faulty sensor if re-
quired.
Tab 10-67 SCR system failure
Indication on LDU
Possible cause
Procedure
External valve system not
ready
SCR system sent a signal that ex-
ternal valve is not ready.
•
Do a check of the external valve
control system.
SCR shutdown
SCR system sent a signal for SCR
shutdown.
•
Do a check of the external SCR
control system.
Tab 10-68 SCR sequence failure
Indication on LDU
Possible cause
Procedure
SCR sequence failure
Failure during Tier 3 sequence.
•
Do an investigation of EDL mes-
sages from the LDU local E71 or
LDU ECR E72.
Urea failure
The minimal level or setpoint is not
reached, when the urea dosing in
requested.
•
Do a detail check of the external
dosing system.
Tab 10-69 SCR alarm failure
Indication on LDU
Possible cause
Procedure
SCR Alarm Stop
CAN sent a signal for SCR alarm
stop.
•
Do a detail check of the external
SCR control system.
SCR Alarm
CAN sent a signal for SCR alarm.
•
Do a detail check of the external
SCR control system.
Tab 10-70 Sensor failure
Indication on LDU
Possible cause
Procedure
TE3755C
Temperature sensor fails to mea-
sure the exhaust gas temperature at
turbine outlet.
Status bit for hardware signal failure:
Temperature sensor TE3755C.
•
Re-establish the cabling X41-7/8
to MCM E70.
•
Replace the faulty sensor if re-
quired.
AE3803C
Humidity sensor fails to measure the
relative humidity at turbocharger in-
let.
Status bit for hardware signal failure:
Humidity sensor.
•
Re-establish the cabling X41-5/6
to MCM E70.
•
Replace the faulty sensor if re-
quired.
X72-B
AA00-0000-00AAD-410A-A
Operation Manual
LP SCR - Alarm failure troubleshooting
Winterthur Gas & Diesel Ltd.
- 464 -
Issue 003 2021-12
