Volvo

The aftertreatment diesel particulate filter (DPF) atomization air pressure sensor is used to monitor the pressure of the compressed air supply to the aftertreatment DPF atomization module during active diagnostics and measures the combined atomization fuel and air pressure during burner operation. The sensor consists of a pressure sensitive diaphragm/amplifier sensor. Air pressure causes the sensors diaphragm to deflect and produce an electrical signal proportional to the pressure. The diaphragm deflection signal is amplified in the sensor.

Conditions for diagnostic trouble code (DTC):
1) Atomization air pressure above normal value with aftertreatment diesel particulate filter (DPF) air shutoff valve closed and aftertreatment DPF atomization air valve open during active diagnostics

Observable symptoms
1) Regeneration not possible

Probable cause
1) Aftertreatment Diesel Particulate Filter (DPF) Atomization Module (Diesel Particulate Filter (DPF) Air shutoff Valve)
2) Aftertreatment DPF Atomization Air Pressure Sensor
3) Aftertreatment Diesel Particulate Filter (DPF) Atomization Module (Aftertreatment DPF Atomization Air Actuator)

The aftertreatment diesel particulate filter (DPF) atomization air pressure sensor is used to monitor the pressure of the compressed air supply to the aftertreatment DPF atomization module during active diagnostics and measures the combined atomization fuel and air pressure during burner operation. The sensor consists of a pressure sensitive diaphragm/amplifier sensor. Air pressure causes the sensors diaphragm to deflect and produce an electrical signal proportional to the pressure. The diaphragm deflection signal is amplified in the sensor.

Conditions for diagnostic trouble code (DTC):
1) Low air pressure detected during active diagnostics check of the pressure regulator in the aftertreament diesel particulate filter (DPF) atomization module

Observable symptoms
1) Regeneration not possible

Probable cause
1) Aftertreatment Diesel Particulate Filter (DPF) Atomization Module (Internal air pressure regulator)
2) Low air pressure
3) Steel fuel line
4) Diesel Particulate Filter (DPF) Air shutoff Valve
5) Aftertreatment DPF Atomization Air Pressure Sensor

The aftertreatment diesel particulate filter (DPF) combustion air valve is controlled by the aftertreatment control module (ACM) output. The combustion air valve is normally closed and is opened when a ground signal is supplied by the ACM to the combustion air valve solenoid. When opened, charged air from the intake manifold is supplied through the combustion air valve to the aftertreatment DPF combustion chamber.

Conditions for diagnostic trouble code (DTC):
1) Exhaust oxygen is too low

Observable symptoms
1) Regeneration not possible

Probable cause
1) Low air pressure
2) Faulty combustion air line
3) Aftertreatment DPF Combustion Air Solenoid
4) Aftertreatment Diesel Particulate FIlter (DPF) Combustion Air Valve

The aftertreatment diesel particulate filter (DPF) combustion air valve is controlled by the aftertreatment control module (ACM) output. The combustion air valve is normally closed and is opened when a ground signal is supplied by the ACM to the combustion air valve solenoid. When opened, charged air from the intake manifold is supplied through the combustion air valve to the aftertreatment DPF combustion chamber.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A137:33 is above normal value

Diagnostic operating conditions
1) Ignition key in ON position

Observable symptoms
1 )Regeneration not possible

Probable cause
1) Short circuit to voltage supply, Control wire (-)
2) Connector
3) Aftertreatment diesel particulate filter (DPF) wiring harness, below raceway
4) Chassis Harness
5) Aftertreatment DPF Combustion Air Solenoid
6) Aftertreatment Control Module (ACM)

The aftertreatment diesel particulate filter (DPF) combustion air valve is controlled by the aftertreatment control module (ACM) output. The combustion air valve is normally closed and is opened when a ground signal is supplied by the ACM to the combustion air valve solenoid. When opened, charged air from the intake manifold is supplied through the combustion air valve to the aftertreatment DPF combustion chamber.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A137:33 is above normal value

Diagnostic operating conditions
1) Ignition key in ON position

Observable symptoms
1) Regeneration not possible

Probable cause
1) Short circuit to voltage supply, Control wire (-)
2) Connector
3) Aftertreatment diesel particulate filter (DPF) wiring harness, below raceway
4) Chassis Harness
5) Aftertreatment DPF Combustion Air Solenoid
6) Aftertreatment Control Module (ACM)

The atomization air valve is part of the atomization module and the combustion air valve is located on the engine. Both are controlled by the same DPF ECU output. The valves are normally closed and are opened when voltage is supplied by the DPF ECU. When opened, compressed air supplied from the air tank through the priority valve is supplied through the atomization air valve to the atomization nozzle while charged air from the intake manifold is supplied through the combustion air valve to the DPF Unit combustion chamber.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A118.B:D3 is below normal value

Observable symptoms
1) Regeneration aborted
2) Regeneration not possible

Probable cause
1) Wiring harness between Aftertreatment Diesel Particulate FIlter (DPF) Combustion Air Valve and Aftertreatment Control Module (ACM)
2) Aftertreatment Diesel Particulate Filter (DPF) Atomization Module
3) Aftertreatment Diesel Particulate FIlter (DPF) Combustion Air Valve
4) DPF Control Unit

The atomization air valve is part of the atomization module and the combustion air valve is located on the engine. Both are controlled by the same DPF ECU output. The valves are normally closed and are opened when voltage is supplied by the DPF ECU. When opened, compressed air supplied from the air tank through the priority valve is supplied through the atomization air valve to the atomization nozzle while charged air from the intake manifold is supplied through the combustion air valve to the DPF Unit combustion chamber.

Conditions for diagnostic trouble code (DTC):
1) Open circuit

Observable symptoms
1) Regeneration not possible

Probable cause
1) Open circuit, Control wire (-)
2) Open circuit, Common voltage supply
3) Aftertreatment diesel particulate filter (DPF) wiring harness, below raceway
4) Chassis Harness
5) Aftertreatment Diesel Particulate Filter (DPF) Atomization Module (Aftertreatment DPF Atomization Air Actuator)
6) Aftertreatment Control Module (ACM)