MTU 12V4000C*5 series, Operating Instructions Manual

Page: 116 / 305

985 – AL NOx ATO2 Communication Lost
Cause Corrective action
The ECU cannot detect the NOx
sensor (B88.2) after LP
turbocharger B side on the bus. 1. Check engine wiring (→ Page 251).
2. Check NOx sensor and replace as necessary (→ Page 257).
3. Contact Service.
1015 – AL Total breakdown NOx sensors
Cause Corrective action
Both NOx sensors (B88.1 and
B88.2) indicate sensor defect or
an invalid value. 1. Replace NOx sensors (→ Page 257).
2. Contact Service.
1026 – AL IAP Communication Lost
Cause Corrective action
The maximum number of
unsuccessful connection attempts
with the EXU has been exceeded. 1. Check engine wiring (→ Page 251).
2. Contact Service.
1027 – AL Engine Cold Active
Cause Corrective action
This fault is signaled and the
“Engine Cold” function initiated if
one of the temperature values has
violated the defined limit. 1. Switch on preheater.
2. Check preheater, overhaul as necessary (see manufacturer's
documentation).
3. Contact Service.
1032 – AL Inj. Drift Limit 1 Cyl. A1
Cause Corrective action
The drift correction for
energization (start and duration)
of injector A1 has violated limit 1.
The injector has soon reached its
maximum drift limit.
u
Schedule an injector replacement.
1033 – AL Inj. Drift Limit 1 Cyl. A2
Cause Corrective action
The drift correction for
energization (start and duration)
of injector A2 has violated limit 1.
The injector has soon reached its
maximum drift limit.
u
Schedule an injector replacement.
114 | Troubleshooting | MS15041/03E 2018-08
TIM-ID: 0000065298 - 004