953 – AL Lambda value invalid
Cause
Corrective action
Status information of lambda
sensor (B89); is generated in case
of short-term implausible
measured values or with faulty
lambda sensor.
1. Acknowledge alarm.
2. Replace lambda sensor (→ Page 166).
3. Contact Service.
954 – AL NOx value invalid
Cause
Corrective action
Status information of NOx sensor
(B88); is generated in case of
short-term implausible measured
values or with faulty NOx sensor.
1. Acknowledge alarm.
2. Replace NOx sensor (→ Page 164).
3. Contact Service.
956 – AL p5 ctrlvar limit min active
Cause
Corrective action
The charge-air pressure regulator
attempts to adjust its set value
but has reached its lower limit.
The bypass flap (M52) is fully
open.
1. Check operation of bypass flap (→ Page 113), (→ Page 159).
2. Contact Service.
957 – AL p5 ctrlvar max BOI min active
Cause
Corrective action
Emission-related alarm.
The charge-air pressure regulator
attempts to adjust its set value
but has reached its upper limit.
The bypass flap (M52) is fully
closed.
The retardation of the start of
injection (BOI) has reached its
maximum value.
1. Check air filter (plant side) for contamination.
2. Check operation of bypass flap (→ Page 113), (→ Page 159).
3. Contact Service.
958 – AL Lambda ctrlvar limit min active
Cause
Corrective action
The lambda regulator attempts to
adjust its set value but has
reached its lower limit. The EGR
shutoff flap (M53) is fully closed.
The dispenser flap (M55) is fully
open.
1. Check operation of dispenser flap (→ Page 113), (→ Page 159).
2. Contact Service.
MS15043/00E 2016-04
| Troubleshooting | 71
TIM-ID: 0000065298 - 002
Summary of Contents for 20V4000C55
Page 1: ...Operating Instructions Diesel engine 20V4000C55 20V4000C65 Application group 5B MS15043 00E...
Page 168: ...168 MS15043 00E 2016 04...
Page 170: ...170 Manufacturer s Documentation MS15043 00E 2016 04...
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Page 184: ...184 Manufacturer s Documentation MS15043 00E 2016 04 TIM ID 0000098598 001...
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