Volvo

Volvo All Engines (2013 Emissions) Fault Code: P204800 PID: ACM Aftertreatment Reagent Dosing Valve Short Circuit Low

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) Short circuit to ground

Observable symptoms
1) No aftertreatment diesel exhaust fluid (DEF) dosage

Probable cause
1) Connector
2) Wiring harness
3) Aftertreatment diesel exhaust fluid (DEF) dosage valve
4) Dosage electronic control unit (ECU), pump unit

Volvo All Engines (2013 Emissions) Fault Code: P204800 PID: EMS Aftertreatment Reagent Dosing Valve Short Circuit 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: P204A01 PID: ACM Reductant Pressure Sensor

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

Diagnostic operating conditions
1) Ignition key in ON position

Observable symptoms
1) No aftertreatment diesel exhaust fluid (DEF) dosage

Probable cause
1) Wiring harness
2) Pressure sensor
3) Aftertreatment diesel exhaust fluid (DEF) pump, Internal fault

Volvo All Engines (2013 Emissions) Fault Code: P204A11 PID: ACM Reductant Pressure Sensor

Circuit description
The aftertreatment control module (ACM) uses the aftertreatment diesel exhaust fluid (DEF) dosing pressure sensor value to adjust and maintain DEF pressure at the DEF dosing valve by controlling DEF pump speed. If the pressure decreases below expected value when the pump is in initial pressure build-up mode or if the pressure increases above expected value when pump is in idle speed mode, the ACM considers DEF pressure outside of normal operating range and indicates a malfunction in a DEF dosing pressure sensor.

Conditions for diagnostic trouble code (DTC)
The voltage at pin A137:30 is less than 0.2?V

Observable symptoms
No aftertreatment diesel exhaust fluid (DEF) dosage

Probable cause
1) Urea Pressure Sensor
2) Wiring harness
3) Aftertreatment Diesel Exhaust Fluid (DEF) Pump

Detailed information
Possible engine de-rate

Volvo All Engines (2013 Emissions) Fault Code: P204A13 PID: ACM Reductant Pressure Sensor

The aftertreatment control module (ACM) uses the aftertreatment diesel exhaust fluid (DEF) dosing pressure sensor value to adjust and maintain DEF pressure at the DEF dosing valve by controlling DEF pump speed. If the pressure decreases below expected value when the pump is in initial pressure build-up mode or if the pressure increases above expected value when pump is in idle speed mode, the ACM considers DEF pressure outside of normal operating range and indicates a malfunction in a DEF dosing pressure sensor.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A137:30 is more than 4.75?V

Observable symptoms
1) No aftertreatment diesel exhaust fluid (DEF) dosage

Probable cause
1) Open circuit, Signal wire
2) Open circuit, Ground wire
3) Wiring harness
4) Aftertreatment Diesel Exhaust Fluid (DEF) Pump

Detailed information
1) Possible engine de-rate

Volvo All Engines (2013 Emissions) Fault Code: P204A13 PID: EMS Reductant Pressure Sensor

Circuit description
The aftertreatment control module (ACM) uses the aftertreatment diesel exhaust fluid (DEF) dosing pressure sensor value to adjust and maintain DEF pressure at the DEF dosing valve by controlling DEF pump speed. If the pressure decreases below expected value when the pump is in initial pressure build-up mode or if the pressure increases above expected value when pump is in idle speed mode, the ACM considers DEF pressure outside of normal operating range and indicates a malfunction in a DEF dosing pressure sensor.

Conditions for diagnostic trouble code (DTC)
The voltage at pin A137:30 is more than 4.75?V

Observable symptoms
No aftertreatment diesel exhaust fluid (DEF) dosage

Probable cause
1) Open circuit, Signal wire
2) Open circuit, Ground wire
3) Wiring harness
4) Aftertreatment Diesel Exhaust Fluid (DEF) Pump

Detailed information
Possible engine de-rate

Volvo All Engines (2013 Emissions) Fault Code: P204A64 PID: ACM Reductant Pressure Sensor

Circuit description
The aftertreatment control module (ACM) uses the aftertreatment diesel exhaust fluid (DEF) dosing pressure sensor value to adjust and maintain DEF pressure at the DEF dosing valve by controlling DEF pump speed. If the pressure decreases below expected value when the pump is in initial pressure build-up mode or if the pressure increases above expected value when pump is in idle speed mode, the ACM considers DEF pressure outside of normal operating range and indicates a malfunction in a DEF dosing pressure sensor.

Conditions for diagnostic trouble code (DTC)
Abnormal pressure

Observable symptoms
No aftertreatment diesel exhaust fluid (DEF) dosage

Probable cause
1) Hose
2) Pressure sensor
3) Nozzle

Volvo All Engines (2013 Emissions) Fault Code: P204B00 PID: ACM Aftertreatment Reagent PumpOrifice Orifice Blocked

Circuit description
The aftertreatment control module (ACM) uses the aftertreatment diesel exhaust fluid (DEF) dosing pressure sensor value to adjust and maintain DEF pressure at the DEF dosing valve by controlling DEF pump speed. If the pressure decreases below expected value when the pump is in initial pressure build-up mode or if the pressure increases above expected value when pump is in idle speed mode, the ACM considers DEF pressure outside of normal operating range and indicates a malfunction in a DEF dosing pressure sensor.

Conditions for diagnostic trouble code (DTC)
DEF Pressure is above 1100?kPa

Probable cause
1) Restricted orifice in the aftertreatment fuel manifold
2) Damaged hoses and/or connections
3) Aftertreatment Diesel Exhaust Fluid (DEF) Pump
4) Blocked return line (damaged or frozen)