49E1 - P209F (DDE)

49E1 - P209F

Information saved in
DDE

Fault code
49E1 - P209F

Fault text
DDE: Reducing-agent active-tank heating: Open circuit,
heater circuit

Fault description
Active tank heater monitoring. An open circuit error is
logged when the heater's measured current draw is below the
limit value UHC_iTnkSensOnMin_C.

Condition for fault identification
Test condition:
The test routine runs when the following conditions are
satisfied:
- The active tank heating system is activated.
- No battery fault is detected.
Voltage condition:
The test routine runs when the following conditions are
satisfied:
- The active tank heating system is activated.
- No battery fault is detected.

Condition for fault memory entry
Debounce (2200 ms)

Action in service
Top up reduction agent and check fluid level using the
diagnostic system.
If it is not possible to repair the problem by refilling with
reduction agent:
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Check the heating system using the diagnostic system.
4. Determine the level of electrical resistance in the tank's
heating system.
5. Check active tank heating system:.
6. Replace power switch.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Refill reduction agent to avoid air bubble. Repeat activation
of heater and check current signal (specified: 5 - 9 A) Check
with tester.
Tank heating system resistance specifications:
1.5 - 2.4 ohms