Reductant circuit
Check the circuits for the following components:The power supply to the temperature sensor and pressure sensor of the reductant doser.The temperature sensor of the reductant doser.The pressure sensor of the reductant doser.Further information about the electrical cables and pins on the control unit to which the components are connected is available in SDP3 under the tab Check for the relevant components. See also the Workshop manual, section 03-35 Electronic control system, E67.There is a general description of the different troubleshooting methods for electrical faults in the Workshop Manual, subgroup 16-70.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Fault in the reductant doser temperature sensor and pressure sensor.
Possible causes: Electrical fault in the power supply circuit for the temperature sensor and pressure sensor of the reductant doser. The circuit is open or short-circuited.Electrical fault in the circuit for the temperature sensor of the reductant doser. The circuit is open or short-circuited to ground.Electrical fault in the circuit for the pressure sensor of the reductant doser. The circuit is open or short-circuited to battery voltage.