Communication with the NOx sensor after catalyst in the EEC system
For software without NOx-control:Clear the fault codes and test start the engine. Turn the ignition off, wait for at least 90 seconds and turn the ignition on. Repeat this a few times.If the fault code is regenerated, check the wiring and clean the connectors. If this does not help, check that the control unit for the EEC system receives ignition voltage (U15) and the control unit for the NOx sensor after catalyst receives supply voltage at the same time. Note that it may take up to 90 seconds before the system shuts down aftr switching the starter key off.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
None.For engines with NOx-control software, this DTC is classed as a type E failure.
Diagnostic depth
There is no CAN NOx frame received from the NOx sensor after catalyst by the control unit for the EEC system.(Refer BOSCH SW-specification Y281S01334-VC0 for more details. Error path: ep06_s_def_ouw.6, cnox_s_def_ouc.0.)
CAN message from the NOx sensor after catalyst can not be read by the control unit for the EEC system. If the fault code has been generated once, the reason might have been that the NOx sensor after catalyst has been exchanged. If this fault code is generated frequently, this is probably due to connector, wiring or the NOx sensor after catalyst.