Volvo

Volvo All Engines (2013 Emissions) Fault Code: P20A107 PID: ACM Aftertreatment Reagent Direction Valve Mechanical Problem

Circuit description
When ignition key is turned to OFF position the selective catalytic reduction (SCR) system enters afterrun mode. During afterrun, system attempts to drain diesel exhaust fluid (DEF) from the DEF dosing valve, DEF pump and DEF lines. Aftertreatment control module (ACM) activates DEF return valve by grounding the control wire (-). When the return valve is activated, the DEF reverses flow back to the tank, and DEF dosing pressure is expected to drop. If the dosing pressure does not drop or if it increases during afterrun, the return valve is considered to have a mechanical fault.

Conditions for diagnostic trouble code (DTC)
Aftertreatment DEF Dosing Pressure too high after ignition key is switched to OFF position

Observable symptoms
Possible engine de-rate
No aftertreatment diesel exhaust fluid (DEF) dosage

Probable cause
1) Frozen Aftertreatment Diesel Exhaust Fluid (DEF) Return Valve
2) Mechanical fault

Volvo All Engines (2013 Emissions) Fault Code: P20A200 PID: ACM Aftertreatment Reagent Direction Valve Short Circuit Low

Circuit description
When ignition key is turned to OFF position the selective catalytic reduction (SCR) system enters afterrun mode. During afterrun, system attempts to drain diesel exhaust fluid (DEF) from the DEF dosing valve, DEF pump and DEF lines. Aftertreatment control module (ACM) activates DEF return valve by grounding the control wire (-). When the return valve is activated, the DEF reverses flow back to the tank, and DEF dosing pressure is expected to drop. If the dosing pressure does not drop or if it increases during afterrun, the return valve is considered to have a mechanical fault.

Observable symptoms
Aftertreatment Diesel Exhaust Fluid (DEF) Pump After-run not possible

Probable cause
1) Connector
2) Wiring harness
3) Aftertreatment Diesel Exhaust Fluid (DEF) Pump

Volvo All Engines (2013 Emissions) Fault Code: P20A200 PID: EMS Aftertreatment Reagent Direction Valve Short Circuit Low

Conditions for diagnostic trouble code (DTC)
Short circuit to ground

Probable cause
1) Valve, Dosage electronic control unit (ECU) (ACM)
2) Dosage electronic control unit (ECU) (ACM)
3) Aftertreatment diesel exhaust fluid (DEF) line

Volvo All Engines (2013 Emissions) Fault Code: P20A300 PID: EMS Aftertreatment Reagent Direction Valve Short Circuit High

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: P20A400 PID: ACM Reductant Purge Control Valve Stuck Open

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 must provide approximately 150?kPa (21.8?psi) air pressure
The overflow valve must be closed below 300?kPa (43.5?psi)
The DEF pressure sensor measures air pressure when the overflow valve should be closed

Probable cause
1) Aftertreatment DEF dosing valve
2) Air line
3) Aftertreatment diesel exhaust fluid (DEF) line

Detailed information
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: P20A500 PID: ACM Reductant Purge Control Valve Stuck Closed

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 must provide approximately 300?kPa (43.5?psi) air pressure
The non-return valve must be opened above 300?kPa (43.5?psi)
The DEF pressure sensor does not measure air pressure when overflow valve should be opened

Probable cause
1) Air supply
2) Overflow valve

Detailed information
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: P20A611 PID: ACM Reductant Injection Air Pressure Control Valve Control

Conditions for diagnostic trouble code (DTC)
The voltage at pin A174.A:21 is below normal value

Diagnostic operating conditions
Ignition key in ON position

Observable symptoms
Uncontrolled air consumption

Probable cause
1) Short circuit to ground
2) Connector
3) Wiring harness
4) Reductant Injection Air Pressure Control Valve Control
5) Aftertreatment Control Module (ACM)

Volvo All Engines (2013 Emissions) Fault Code: P20A613 PID: ACM Reductant Injection Air Pressure Control Valve Control

Conditions for diagnostic trouble code (DTC)
Open circuit

Diagnostic operating conditions
Ignition key in ON position

Observable symptoms
Uncontrolled air consumption

Probable cause
1) Open circuit
2) Connector
3) Wiring harness
4) Actuator
5) Aftertreatment Control Module (ACM)