Circuit DescriptionThe aftertreatment DPF is located in the exhaust stream and captures the soot that is produced by the engine. Under normal operating conditions, the aftertreatment DPF is self-cleaning where soot is converted to carbon dioxide, nitrogen, and water. Under light load operating conditions, it can be necessary to perform a stationary regeneration of the aftertreatment DPF. The soot load in the aftertreatment DPF is estimated, using the aftertreatment differential pressure sensor and the calculated soot output of the engine.

Component LocationThe aftertreatment DPF is located in the exhaust system and is installed by the original equipment manufacturer (OEM). Refer to the OEM service manual.

Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault CodesThe aftertreatment DPF outlet temperature sensor reading exceeds 950?C [1742?F] for 30 seconds, or the difference between the DPF intake temperature and the DPF outlet temperature is greater than 1050?C [1922?F] for 30 seconds.

Action Taken When the Fault Code is ActiveThe engine control module (ECM) illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.Active and stationary regeneration of the DPF will be disabled.The EGR valve will be closed.Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.Conditions for Clearing the Fault CodeTo validate the repair, start the engine and let it idle for 1 minute.The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults.

Shop TalkPossible causes of this fault code include:

Excessive engine oil or diesel fuel being introduced into the exhaust system from the engineA malfunctioning engine fuel injector causing unburned diesel fuel to enter the exhaust systemThe aftertreatment DPF outlet temperature sensor malfunctioning in-rangeA face plugged aftertreatment diesel oxidation catalyst (DOC)An in-range engine sensor malfunction has occurred, causing excessive fuel to enter the exhaust system.Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

For intermittent power supply and data link communication issues with aftertreatment components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.

Possible cause:1) ECM calibration