Volvo

Volvo All Engines (2013 Emissions) Fault Code: P204C00 PID: ACM Aftertreatment Reagent Pressure Sensor Circuit Low

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-rateCircuit 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: P204F93 PID: ACM SCR System Performance Dosing Failure

Circuit description
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. Only certain mechanical failure or blockage in the DEF dosing valve or DEF supply line from the DEF tank will result with this fault, it is not a indication of an electrical fault.

Conditions for diagnostic trouble code (DTC)
Clogged or damaged component

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

Probable cause
1) Aftertreatment diesel exhaust fluid (DEF) dosage valve

Volvo All Engines (2013 Emissions) Fault Code: P204F93 PID: EMS SCR System Performance Dosing Failure

Circuit description
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. Only certain mechanical failure or blockage in the DEF dosing valve or DEF supply line from the DEF tank will result with this fault, it is not a indication of an electrical fault.

Conditions for diagnostic trouble code (DTC)
Clogged or damaged component

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

Probable cause
1) Aftertreatment diesel exhaust fluid (DEF) dosage valve

Volvo All Engines (2013 Emissions) Fault Code: P204F94 PID: ACM SCR System Performance Dosing Failure

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: P205A01 PID: ACM Reductant Tank Temperature Sensor

Conditions for diagnostic trouble code (DTC)
Open circuit between Electronic Control Unit and Sensor
Short circuit to higher voltage

Diagnostic operating conditions
Ignition key in ON position

Probable cause
1) Connector
2) Wiring harness
3) Temperature Sensor, Aftertreatment diesel exhaust fluid (DEF) tank

Volvo All Engines (2013 Emissions) Fault Code: P205A11 PID: ACM Reductant Tank Temperature Sensor

Circuit description
Aftertreatment Control Module (ACM) monitors DEF tank temperature and uses it to control the Aftertreatment DEF Tank Heater valve to keep the DEF from freezing.
This temperature monitoring is also used to avoid stopped DEF dosing due to high DEF tank temperatures. If the DEF temperature is too high, reverse flow will be activated, if the temperature stays high for a short duration, a DTC is set.

Conditions for diagnostic trouble code (DTC)
Short circuit to lower voltage

Probable cause
1) Connector
2) Wiring harness
3) Short circuit to ground, Signal wire
4) Temperature Sensor, Aftertreatment diesel exhaust fluid (DEF) tank

Volvo All Engines (2013 Emissions) Fault Code: P205A13 PID: ACM Reductant Tank Temperature Sensor

Circuit description
Aftertreatment Control Module (ACM) monitors DEF tank temperature and uses it to control the Aftertreatment DEF Tank Heater valve to keep the DEF from freezing.
This temperature monitoring is also used to avoid stopped DEF dosing due to high DEF tank temperatures. If the DEF temperature is too high, reverse flow will be activated, if the temperature stays high for a short duration, a DTC is set.

Conditions for diagnostic trouble code (DTC)
Check for open-circuit

Observable symptoms
Engine de-rated

Probable cause
1) Connector
2) Wiring harness
3) Reductant Tank Temperature Sensor

Volvo All Engines (2013 Emissions) Fault Code: P205A13 PID: EMS Reductant Tank Temperature Sensor

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