MTU 20V4000C55, Руководство по эксплуатации

Страница: 72 / 226

959 – AL Lambda ctrlvar max BOI min act
Cause Corrective action
Emission-related alarm.
This fault is a strong indication of
serious soot contamination in the
EGR cooler (sooting). However, it
can also be caused by a
mechanical defect in the exhaust
flap before the cooler and/or the
dispenser flap (broken linkage,
but servomotor electrically OK). A
signal error of the lambda sensor
can also result in this alarm. 1. Check operation of EGR shutoff flap and dispenser flap
(→ Page 113), (→ Page 159).
2. Contact Service.
960 – AL NOx p5 min BOI max active
Cause Corrective action
Emission-related alarm.
The charge-air pressure has
reached the minimum value
defined in the performance map.
The advanced start of injection
has reached its maximum value. 1. Check operation of bypass flap (→ Page 113), (→ Page 159).
2. Contact Service.
961 – AL NOx p5 max BOI min active
Cause Corrective action
Emission-related alarm.
This fault is a strong indication of
serious soot contamination in the
EGR cooler (sooting).
The charge-air pressure has
reached the maximum value
defined in the performance map.
The retardation of the start of
injection (BOI) has reached its
maximum value. u Contact Service.
962 – AL GPS Lambda ctrlvar max active
Cause Corrective action
This fault is a strong indication of
serious soot contamination in the
EGR cooler (sooting).
The lambda regulator attempts to
adjust its set value but has
reached its upper limit. The EGR
shutoff flap (M53) is fully opened.
The dispenser flap (M55) is fully
closed. 1. Check operation of EGR shutoff flap, dispenser flap and bypass flap
(→ Page 113), (→ Page 159).
2. Check EGR cooler for coolant leaks.
3. Contact Service.
72 | Troubleshooting | MS15043/00E 2016-04
TIM-ID: 0000065298 - 002