Communication with the EEC system
Erase the fault code memory and try to start the engine. Turn the ignition on and off a few times.If the fault code reoccurs again, check the wiring and clean the connectors.If the fault code still reoccurs, check that booth the EEC and the NOx sensor before catalyst gets the U15 voltage at the same time.If everything else is OK, renew the NOx sensor before catalyst in the first place and the EEC in the second place (if the truck has one).
What you'll see
No driver-visible symptom recorded.
System reaction
None.
Diagnostic depth
The CAN message MSG8 ‘NOx sensor data before catalyst’ (see PD 1522079) from the NOx sensor before catalyst is not received, if the truck is configured with an EEC system this messages is received via the EEC (gatewayed).
Communication between the EMS and the NOx sensor before catalyst has been interrupted. On trucks equipped with EEC the message is gatewayed via the EEC system.If fault code 100C has been generated at the same time, there is probably a problem in the communication between the EMS and the EEC. Follow description of fault code 100C.If, on a truck configured with EEC, fault code 100C not has been generated at the same time, there is probably a problem in the communication between the EEC and the NOx sensor before catalyst.If the fault code has only been generated once, this may be due to the voltage to the NOx sensor before catalyst has been interrupted while the EEC system has been supplied with voltage. If the fault code has been generated frequently, this is probably due to a wiring or connection fault.