Volvo

Volvo All Engines (2013 Emissions) Fault Code: P20DD64 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 sensor signal is not rational

Observable symptoms
Regeneration not possible

Probable cause
1) Aftertreatment Fuel Pressure Sensor

Volvo All Engines (2013 Emissions) Fault Code: P20E000 PID: EMS Exhaust Aftertreatment Fuel Pressure Sensor Circuit High

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):
1) The voltage at pin A14.EA:50 is more than 4.8?V

Diagnostic operating conditions
1) Ignition key in ON position

Observable symptoms
1) Regeneration not possible

Probable cause
1) Connector
2) Open circuit on ground wire
3) Short circuit to voltage supply, signal wire
4) Aftertreatment Fuel Pressure Sensor
5) Engine Control Module (ECM)

Volvo All Engines (2013 Emissions) Fault Code: P20E797 PID: ACM Reductant Injection Air Pressure Too High

Circuit description
This function is used to calculate the EGR Mass Flow. The Engine Control Module (ECM) monitors the EGR differential pressure sensor and the EGR temperature sensor after cooler and uses these signals to calculate the EGR Mass Flow data.

Conditions for diagnostic trouble code (DTC)
The air valve duty cycle is lower than expected
The air pressure decreases slower than expected when the air valve has been closed

Observable symptoms
Possible engine de-rate

Probable cause
1) Nozzle (Air circuit)
2) Air line
3) Crystals in the Aftertreatment Diesel Exhaust Fluid (DEF) mixing tube
4) Aftertreatment diesel exhaust fluid (DEF) pump

Detailed information
Crystallized Aftertreatment Diesel Exhaust Fluid (DEF) indicates that the overflow valve is leaking DEF solution backwards
To fully verify the repair it may be necessary to activate vehicle functions or perform a test drive

Volvo All Engines (2013 Emissions) Fault Code: P20E892 PID: ACM Reductant Pressure Too Low

Circuit description
The aftertreatment control module (ACM) monitors the pressure build up in the diesel exhaust fluid (DEF) dosing system. This diagnostic function checks the time it takes for the DEF dosing pressure to reach more than 650 kPa (94 psi). If the pressure is not reached in 20 minute(s) this DTC will be set.

Conditions for diagnostic trouble code (DTC)
Aftertreatment DEF Dosing Pressure Lower than expected

Observable symptoms
No aftertreatment diesel exhaust fluid (DEF) dosage
Engine de-rated

Probable cause
1) Empty tank
2) Frozen aftertreatment diesel exhaust fluid (DEF)
3) DEF Supply from Aftertreatment DEF Tank disconnected
4) Aftertreatment DEF Line(s) Leakage
5) Aftertreatment DEF dosing valve Leakage
6) Aftertreatment Diesel Exhaust Fluid (DEF) Pump Leakage
7) Damaged sending unit inside the aftertreatment DEF tank
8) Damaged or clogged filter
9) Aftertreatment DEF Dosing Pressure Sensor, Incorrect value
10) Blocked DEF tank ventilation hose
11) Air in the system
12) Crystallization inside the DEF pump
13) Low level in Aftertreatment diesel exhaust fluid (DEF) tank

Volvo All Engines (2013 Emissions) Fault Code: P20E892 PID: EMS Reductant Pressure Too Low

Conditions for diagnostic trouble code (DTC):
1) Active DTCs in EATS System
2) Other DTCs detected may be the reason for the selected DTC to be set. The recommendation is to fault trace and repair the other DTCs first. Repairing the other detected DTCs may change selected DTC to inactive.

Action
1) Aftertreatment Control Module (ACM)
2) Fault trace active diagnostic trouble codes (DTCs) on above components

Volvo All Engines (2013 Emissions) Fault Code: P20EE00 PID: EMS SCR NOx Catalyst Efficiency Below Threshold (Bank 1)

When the aftertreatment selective catalytic reduction (SCR) system operates under normal conditions, the aftertreatment control module (ACM) monitors diesel exhaust fluid (DEF) dosing valve duty cycle and DEF pump control value. When the DEF dosing valve duty cycle increases above allowed threshold and the DEF pump control value decreases below expected threshold, the ACM stops DEF dosing and reports a fault. The fault might be indication of electrical failure or blockage in DEF dosing valve or DEF supply line from the DEF tank.

Conditions for diagnostic trouble code (DTC):
1) Reduced NOx conversion

Observable symptoms
1) Too high NOx emissions
2) Engine de-rated

Probable cause
1) Clogged muffler
2) DEF Dosing
3) DEF concentration