P208E

4D35 - P208E

Information saved in
DDE

Fault code
4D35 - P208E

Fault text
DDE: Reducing-agent metering valve, plausibility: Metering
valve jammed closed

Fault description
Metering module plausibility check. Once compliance with
the test conditions is present the current pressure of the
reduction agent is saved.
When the test is enabled the pressure differential between
the saved pressure value and the current monitored value is
calculated and monitored for compliance with the limit
value 1000 mbar.
If the limit value is exceeded this indicates a sticking
metering module and a diagnostic trouble code is logged.

Condition for fault identification
Test condition:
The monitoring data are recalculated (positive flanks) when
the state machine has a value of COSCR_VENTILLATION
and the pressure of the metering pump is above the limit
value 3000 mbar.
Voltage condition:
The monitoring data are recalculated (positive flanks) when
the state machine has a value of COSCR_VENTILLATION
and the pressure of the metering pump is above the limit
value 3000 mbar.

Condition for fault memory entry
Event debounced (150)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Use the diagnostic tester to activate the metering module
and then listen for a ticking sound.
4. If an audible noise is present delete the stored DTCs from
the error memory. The metering module is not defective.
5. If no sound is heard, remove the metering module and
rinse it with water to remove crytallized deposits of urea.
Install the module again and activate it using the diagnostic
tester. If a ticking sound is now audible the module is once
again operational. Delete stored DTCs from error memory.
6. No no noise is audible replace the metering module.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none