Reductant hose 4 heater H28, open load.
Check for open load failure on the pins on the EEC control unit (E67) that is connected to H28 the reductant hose 4 heater. For a detailed harness and pin description see the electrical component, under the check tab, in the diagnostic tool. For a general description about different methods for electrical failure checks see the work shop manual subgroup 16-70. In order to inactivate the electrical fault code it is necessary to restart the EEC control unit and activate the actuator. This can be done by first cycling the ignition and then running the SCR thawing test with the diagnostic tool or cycling the ignition and then running the system in such a way that the actuator is activated. In this case a normal start-up.
What you'll see
No driver-visible symptom recorded.
System reaction
The SCR reductant dosing may be stopped in cold climate, which leads to higher emissions.
Diagnostic depth
The EEC control unit (E67) is indicating an open load fault on the pins connected to H28 the reductant hose 4 heater.
An open load fault on the pins connected to H28 the reductant hose 4 heater.