4D10 - P209F (DDE)

4D10 - P209F

Information saved in
DDE

Fault code
4D10 - P209F

Fault text
DDE: Reducing-agent active-tank heating, plausibility:
Temperature increase too low

Fault description
Plausibility check on active tank heater. When the heating
system is activated the current temperature in the urea tank
is saved and a timer starts.
The DTC is logged when it proves impossible to heat the
tank to the limit value defined relative to the active tank's
temperature within the time defined relative to temperature.
The limit value is calculated based on the active tank
temperature and a characteristic curve and lies between
roughly 5 �C at an active tank temperature of -40 �C and 0
�C at an active tank temperature of 0 �C.

Condition for fault identification
Test condition:
The error check runs continuously while the active tank
heater is activated.
Voltage condition:
The error check runs continuously while the active tank
heater is activated.

Condition for fault memory entry
No debouncing.

Action in service
1. Use diagnostic system to check active tank temperature
sensor's transmitted data for plausibility.
2. Check active tank heating system: Transmit activation
signal to heater and check current.
3. Check wires and plug connections at active tank heater
and active tank temperature sensor.
4. Replace the active tank.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Specified current during activation: at least 400 uA.
If defects related to the temperature sensor and/or wiring are
present, then diagnostic trouble codes for the sensors must
also be logged.