846 – AL HI T-Charge Air Diff AB
Cause
Corrective action
The differential temperature
measured at sensors B9.2 and
B9.3 has violated limit value 1.
The charge-air temperature is too
high.
u
Contact Service.
847 – AL HIHI T-Charge Air Diff AB
Cause
Corrective action
The differential temperature
measured at sensors B9.2 and
B9.3 has violated limit value 2.
The charge-air temperature is too
high.
u
Contact Service.
851 – AL External Start and HP too high
Cause
Corrective action
This alarm is generated on
starting the engine but before the
starter engages when the
pressure in the HP accumulator at
sensors B48.1 A side and/or
B48.2 B side exceeds the limit
value.
u
Contact Service.
852 – AL Max. Blank Shot time expired
Cause
Corrective action
The alarm is generated when the
engine is at standstill if the
pressure in HP accumulator could
not be relieved within the set
time.
u
Contact Service.
855 – AL Flap Bypass B Defect
Cause
Corrective action
The bypass flap on the B side
(M52.2) is faulty.
u
Contact Service.
857 – AL NOx ATO1 Sensor Defect
Cause
Corrective action
The signal from the NOx sensor
B88.1 in the exhaust pipe
downstream of the LP
turbocharger on the A side is
faulty or missing.
1. Check engine wiring (→ Page 157).
2. Check NOx sensor, replace as necessary (→ Page 160).
3. Contact Service.
MS150100/06E 2017-08
| Troubleshooting | 85
TIM-ID: 0000064702 - 003
