Defreezing mode error in the EEC system
Check that the coolant water level not is to low.Check the ventilation of the urea tank for blockage.To verify that the suction line heater is working, start the engine and check that the suction line gets warm. If not, check the suction line for bends, leakage or blockage of the water path. Also check that the water valve opens fully.If the heater is working, check the suction line and connections for urea leakage.For engines with NOx-control software, confirmation of repair requires:- Urea box temperature is greater than -8 degC- Urea tank temperature is greater than -8 degC- Urea temperature in dosing module is greater than -8 degC - Execute the ‘SCR invalidation test’ with SDP3 (takes approximately 30 minutes and needs to be run outdoors)- Or make sure the urea gets defrozen and catalyst temperature is raised to 130 degCIf the fault is remedied, the DTC should now be passive.
What you'll see
No driver-visible symptom recorded.
System reaction
The EEC system will not inject any urea, which leads to higher emissions.For engines with NOx-control software, this DTC is classed as a type D failure.
Diagnostic depth
Defreezing of inlet line has failed 15 times, i.e. the pump can not raise the urea pressure above 2.8 bar in 70 seconds.(Refer BOSCH SW-specification Y281S01334-VC0 for more details. Error path: ep04_s_def_ouw.9, hhsm_s_def_ouc.0.)
The defreezing mode error might be caused by: - Blockage in the tank ventilation.- Frozen urea in the tank mountings, suction line or inline to the EEC main unit.- Leakage at the suction line for urea.