Volvo

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 symptoms1) No aftertreatment diesel exhaust fluid...

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) Open circuit Observable symptoms1) No aftertreatment diesel exhaust fluid (DEF) dosage...

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) Mechanical fault Observable symptoms1) No aftertreatment diesel exhaust fluid (DEF) dosage...

The Engine Control Module (ECM) monitors the crankshaft angular acceleration using the flywheel sensor. The ECM monitors the camshaft position sensor to determine the engine?s position. The ECM calculates the average value of crankshaft angular acceleration for all six cylinders and compares the value to each individual cylinder?s angular acceleration. If a cylinder?s acceleration value is outside a specified range the ECM interprets this as a misfiring cylinder. The crankshaft average angular acceleration value is used by the ECM to determine cylinder balancing and idle speed. Conditions for diagnostic trouble code (DTC):1) Calculated fuel consumption, Above normal Observable symptoms1) High...

This diagnostic function detects if the regeneration frequency increases to a level such that it would cause the emissions to exceed the OBD threshold or if the frequency exceeds the design requirements.The number of completed regenerations during a defined time period is counted. If the number of regenerations are above threshold at the end of the time period fault is reported. Conditions for diagnostic trouble code (DTC):1) Regeneration successful but too frequent Observable symptoms1) DPF Regeneration too frequent Probable cause1) Aftertreatment DPF Differential Pressure Sensor2) EGR System3) Aftertreatment diesel particulate filter (DPF) is damaged, soot loaded or missing4) Excessive ash...