984 – AL NOx ATO2 Sensor Defect
Cause
Corrective action
The signal from the NOx sensor
B88.2 in the exhaust pipe
downstream of the turbocharger
on the B side is faulty or missing.
1. Check engine wiring (→ Page 135).
2. Check NOx sensor, replace as necessary (→ Page 138).
3. Contact Service.
985 – AL NOx ATO2 Communication Lost
Cause
Corrective action
The ECU can no longer detect
NOx sensor B88.2 downstream of
the LP turbocharger (B side) on
the bus.
1. Check engine wiring (→ Page 135).
2. Check NOx sensor, replace as necessary (→ Page 138).
3. Contact Service.
1015 – AL Total breakdown NOx sensors
Cause
Corrective action
Both NOx sensors (B88.1 and
B88.2) indicate a Sensor Defect
or an invalid value.
u
Contact Service.
1097 – AL Flap Egr A Communication Lost
Cause
Corrective action
The ECU can no longer detect the
EGR shutoff flap on the A side
(M53.1/MA53.1) on the bus.
1. Check engine wiring (→ Page 135).
2. Contact Service.
1098 – AL Flap Egr A Temperature too high
Cause
Corrective action
The internal electronics of the
servomotor for the EGR shutoff
flap on the A side (M53.1/
MA53.1) signal excessively high
temperature.
u
Contact Service.
1099 – AL Flap Egr A Targetposition
Cause
Corrective action
The servomotor of the EGR
shutoff flap on the A side (M53.1/
MA53.1) has failed to reach its
target position within the set time.
u
Contact Service.
1100 – AL Flap Egr B Communication Lost
Cause
Corrective action
The ECU can no longer detect the
EGR shutoff flap on the B side
(M53.2/MA53.2) on the bus.
1. Check engine wiring (→ Page 135).
2. Contact Service.
90 | Troubleshooting | MS150100/04E 2015-09
TIM-ID: 0000064702 - 001
