Urea temperature sensor in the EEC main unit
Check the signal from the sensor.See if there is any visible fault on the urea temperature sensor (in the EEC main unit), wiring or connectors.Check if the water valve for the urea tank heater is stuck.Check the internal urea line heater, wiring and connectors.For engines with NOx-control software, confirmation of repair requires:- Turn the ignition off, wait at least 90 s- Turn the ignition on If 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 be shut off until next driving cycle (ignition key off) and will not inject any urea, which leads to higher emissions. High temperatures may destroy the urea.Fault code 101A, 100C, 100A and 100B (CAN time out) may occur when the system is shut off. Always trouble shoot this fault code before considering 101A, 100C, 100A or 100B.NOTE: The diagnosis for this fault code can not be performed when the EEC system is shut off. Thus the fault code can not become passive or be regenerated (if erased) until next driving cycle. Switch off ignition key for 90 seconds and switch it on again before reading fault codes.For engines with NOx-control software, this DTC is classed as a type D failure.
Diagnostic depth
The urea temperature in the EEC main unit has been outside permitted interval, i.e. above 81 degC.(Refer BOSCH SW-specification Y281S01334-VC0 for more details. Error path: ep06_s_def_ouw.2, sutb_s_def_ouc.7.)
The urea temperature sensor in the EEC main unit shows wrong value, the water valve for the urea tank heater is stuck open or the internal urea line heater is not switching off when it is supposed to.