Volvo

Volvo All Engines (2013 Emissions) Fault Code: P20D712 PID: EMS Exhaust Aftertreatment Fuel Supply Control

Circuit description
The Aftertreatment Hydrocarbon Dosing Module contains three non serviceable valves, the Aftertreatment Fuel Shutoff Valve, Aftertreatment Purge Air Valve and Aftertreatment Hydrocarbon Dosing Valve, and a serviceable Aftertreatment Fuel Pressure Sensor.

During DPF regeneration the Engine Control Module (ECM) sends a voltage signal to activate the Aftertreatment Fuel Shutoff Valve to the open position. This allows fuel to flow into the Aftertreament Hydrocarbon Dosing Module. The Aftertreatment Fuel Pressure Sensor monitors the fuel pressure value and sends a reference signal to the ECM. The ECM then sends a PWM signal to the Aftertreatment Hydrocarbon Dosing Valve that regulates the amount of fuel delivered to the Aftertreatment Hydrocarbon Doser through the air/fuel line.

Conditions for diagnostic trouble code (DTC)
Current below normal or open circuit

Diagnostic operating conditions
Ignition key in ON position

Observable symptoms
Regeneration not possible
Aftertreatment selective catalytic reduction (SCR) catalyst warming not possible

Probable cause
1) Connector
2) Engine wiring harness
3) Aftertreatment fuel shut-off valve
4) Engine control module (ECM)

Volvo All Engines (2013 Emissions) Fault Code: P20D713 PID: EMS Exhaust Aftertreatment Fuel Supply Control

The Aftertreatment Hydrocarbon Dosing Module contains three non serviceable valves, the Aftertreatment Fuel Shutoff Valve, Aftertreatment Purge Air Valve and Aftertreatment Hydrocarbon Dosing Valve, and a serviceable Aftertreatment Fuel Pressure Sensor.
During DPF regeneration the Engine Control Module (ECM) sends a voltage signal to activate the Aftertreatment Fuel Shutoff Valve to the open position. This allows fuel to flow into the Aftertreament Hydrocarbon Dosing Module. The Aftertreatment Fuel Pressure Sensor monitors the fuel pressure value and sends a reference signal to the ECM. The ECM then sends a PWM signal to the Aftertreatment Hydrocarbon Dosing Valve that regulates the amount of fuel delivered to the Aftertreatment Hydrocarbon Doser through the air/fuel line.

Conditions for diagnostic trouble code (DTC):
1) Voltage below normal or shorted low

Diagnostic operating conditions
1) Ignition key in ON position

Observable symptoms
1) Regeneration not possible
2) Aftertreatment selective catalytic reduction (SCR) catalyst warming not possible

Probable cause
1) Connector
2) Short circuit to ground
3) Engine wiring harness
4) Wiring harness
5) Engine Control Module (ECM)

Volvo All Engines (2013 Emissions) Fault Code: P20D773 PID: EMS Exhaust Aftertreatment Fuel Supply Control

Circuit description
The Aftertreatment Hydrocarbon Dosing Module contains three non serviceable valves, the Aftertreatment Fuel Shutoff Valve, Aftertreatment Purge Air Valve and Aftertreatment Hydrocarbon Dosing Valve, and a serviceable Aftertreatment Fuel Pressure Sensor.

During DPF regeneration the Engine Control Module (ECM) sends a voltage signal to activate the Aftertreatment Fuel Shutoff Valve to the open position. This allows fuel to flow into the Aftertreament Hydrocarbon Dosing Module. The Aftertreatment Fuel Pressure Sensor monitors the fuel pressure value and sends a reference signal to the ECM. The ECM then sends a PWM signal to the Aftertreatment Hydrocarbon Dosing Valve that regulates the amount of fuel delivered to the Aftertreatment Hydrocarbon Doser through the air/fuel line.

During Air Purge operation the Engine Control Module (ECM) sends a voltage signal to activate the Aftertreatment Purge Air Valve open. This allows air pressure to flow into the Aftertreament Hydrocarbon Dosing Module. The ECM then sends a PWM signal to the Aftertreatment Hydrocarbon Dosing Valve that allows purge air pressure to be monitored by a signal from the Aftertreatment Fuel Pressure Sensor to the ECM.

Conditions for diagnostic trouble code (DTC)
Aftertreatment Fuel Pressure, not within expected range
Fuel pressure fault

Observable symptoms
Regeneration not possible

Probable cause
1) Fuel pressure
2) Fuel line(s)
3) Aftertreatment Hydrocarbon Dosing Module

Volvo All Engines (2013 Emissions) Fault Code: P20DA00 PID: EMS Exhaust Aftertreatment Fuel Supply Control

The Aftertreatment Hydrocarbon Dosing Module contains three non serviceable valves, the Aftertreatment Fuel Shutoff Valve, Aftertreatment Purge Air Valve and Aftertreatment Hydrocarbon Dosing Valve, and a serviceable Aftertreatment Fuel Pressure Sensor.
During DPF regeneration the Engine Control Module (ECM) sends a voltage signal to activate the Aftertreatment Fuel Shutoff Valve to the open position. This allows fuel to flow into the Aftertreament Hydrocarbon Dosing Module. The Aftertreatment Fuel Pressure Sensor monitors the fuel pressure value and sends a reference signal to the ECM. The ECM then sends a PWM signal to the Aftertreatment Hydrocarbon Dosing Valve that regulates the amount of fuel delivered to the Aftertreatment Hydrocarbon Doser through the air/fuel line.

Conditions for diagnostic trouble code (DTC):
1) Voltage above normal or shorted high

Diagnostic operating conditions
1) Ignition key in ON position

Observable symptoms
1) Regeneration not possible
2) Aftertreatment selective catalytic reduction (SCR) catalyst warming not possible

Probable cause
1) Connector
2) Short circuit to voltage supply, Control wire (+)
3) Engine wiring harness
4) Engine Control Module (ECM)

Volvo All Engines (2013 Emissions) Fault Code: P20DC00 PID: EMS Exhaust Aftertreatment Fuel Supply Control

The Aftertreatment Hydrocarbon Dosing Module contains three non serviceable valves, the Aftertreatment Fuel Shutoff Valve, Aftertreatment Purge Air Valve and Aftertreatment Hydrocarbon Dosing Valve, and a serviceable Aftertreatment Fuel Pressure Sensor.
During DPF regeneration the Engine Control Module (ECM) sends a voltage signal to activate the Aftertreatment Fuel Shutoff Valve to the open position. This allows fuel to flow into the Aftertreament Hydrocarbon Dosing Module. The Aftertreatment Fuel Pressure Sensor monitors the fuel pressure value and sends a reference signal to the ECM. The ECM then sends a PWM signal to the Aftertreatment Hydrocarbon Dosing Valve that regulates the amount of fuel delivered to the Aftertreatment Hydrocarbon Doser through the air/fuel line.
During Air Purge operation the Engine Control Module (ECM) sends a voltage signal to activate the Aftertreatment Purge Air Valve open. This allows air pressure to flow into the Aftertreament Hydrocarbon Dosing Module. The ECM then sends a PWM signal to the Aftertreatment Hydrocarbon Dosing Valve that allows purge air pressure to be monitored by a signal from the Aftertreatment Fuel Pressure Sensor to the ECM.

Conditions for diagnostic trouble code (DTC):
1) Aftertreatment Fuel Pressure, not within expected range
2) Fuel pressure fault

Observable symptoms
1) Regeneration not possible

Probable cause
1) Fuel pressure
2) Fuel line(s)
3) Aftertreatment Hydrocarbon Dosing Module

Volvo All Engines (2013 Emissions) Fault Code: P20DD11 PID: EMS Exhaust Aftertreatment Fuel Pressure Sensor

Circuit description
During DPF regeneration the Aftertreatment Fuel Pressure Sensor monitors the fuel pressure rise and drop in the Aftertreament Hydrocarbon Dosing Module. During Air Purge the Aftertreatment Fuel Pressure Sensor monitors the air pressure rise and drop in the Aftertreament Hydrocarbon Dosing Module. The Engine Control Module (ECM) uses this input to determine if the system is operating correctly.

Conditions for diagnostic trouble code (DTC)
The voltage at pin A14.EA:50 is less than 0.2?V

Diagnostic operating conditions
Ignition key in ON position

Observable symptoms
Regeneration not possible

Probable cause
1) Connector
2) Open circuit, Supply wire
3) Open circuit, Signal wire
4) Short circuit to ground, Signal wire
5) Aftertreatment Fuel Pressure Sensor
6) Engine control module (ECM)