Volvo

Conditions for diagnostic trouble code (DTC):
1) One or more diagnostic trouble codes (DTCs) have been set for faults in the exhaust aftertreatment

Observable symptoms
1) Aftertreatment selective catalytic reduction (SCR) system, Performance has degraded

Detailed information
1) This diagnostic trouble codes (DTC) indicates that inducement actions are active

Conditions for diagnostic trouble code (DTC):
1) One or more diagnostic trouble codes (DTCs) have been set for faults in the exhaust aftertreatment

Observable symptoms
1) Engine de-rated

Detailed information
1) This diagnostic trouble codes (DTC) indicates that inducement actions are active

Conditions for diagnostic trouble code (DTC):
1) Charge air temperature too high

Observable symptoms
1) Charge air temperature too high

Probable cause
1) Charge air cooler

This diagnostic function evaluates if the catalyst is converting the fuel from the aftertreatment hydrocarbon doser into enough heat at the beginning of the aftertreatment diesel particulate filter (DPF) regeneration. The aftertreatment DPF intake temperature sensor (post catalyst) should steadily increase and stabilize once the desired temperatures are met.

Conditions for diagnostic trouble code (DTC):
1) Catalyst outlet temperature reaction time too low to support hydrocarbon conversion

Observable symptoms
1) None

Probable cause
1) Obstructed/dirty aftertreatment hydrocarbon doser
2) Air purge system
3) Exhaust Gas Temperature (EGT) Sensor
4) Catalyst failure

This diagnostic function evaluates if the catalyst is converting the fuel from the aftertreatment hydrocarbon doser into enough heat at the beginning of the aftertreatment diesel particulate filter (DPF) regeneration. The aftertreatment DPF intake temperature sensor (post catalyst) should steadily increase and stabilize once the desired temperatures are met.

Conditions for diagnostic trouble code (DTC):
1) Catalyst outlet temperature reaction time too low to support hydrocarbon conversion

Observable symptoms
1) None

Probable cause
1) Exhaust Gas Temperature (EGT) Sensor
2) Catalyst failure

This diagnostic function monitors the systems ability to maintain and regulate the DPF temperatures within acceptable limits based on current conditions like normal operation or during regenerations.

Conditions for diagnostic trouble code (DTC):
1) Incomplete regeneration

Probable cause
1) Regeneration aborted
2) Excessive soot, cleaning required
3) Damaged or clogged filter

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):
1) Aftertreatment DEF Dosing Pressure Lower than expected

Observable symptoms
1) No aftertreatment diesel exhaust fluid (DEF) dosage
2) 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) Aftertreatment Diesel Exhaust Fluid (DEF) Return Valve
11) Blocked DEF tank ventilation hose
12) Air in the system
13) Crystallization inside the DEF pump
14) Low level in Aftertreatment diesel exhaust fluid (DEF) tank
15) Contamination or debris inside DEF tank

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) The aftertreatment diesel exhaust fluid (DEF) dosing valve has frozen too many times

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

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

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
2) Observable symptoms
3) Too high NOx emissions

Probable cause
1) Clogged muffler
2) DEF Dosing
3) DEF concentration
4) Faults causing leaking or high hydro carbons in muffler
5) Aftertreatment Hydrocarbon Doser, over-fueling