P2463

P2463-DIESEL PARTICULATE FILTER - SOOT ACCUMULATION



Theory of Operation

The engine after treatment system monitors the soot load in the After treatment Diesel Particulate Filter. Under normal operating conditions the After treatment Diesel Particulate Filter is self-cleaning, where soot is converted to ash. The soot load in the After treatment Diesel Particulate Filter is estimated using the Exhaust Pressure Sensor and the calculated soot output of the engine. This fault code can be triggered if the application is not operating at a duty cycle high enough to actively regenerate the After treatment Diesel Particulate Filter. It may be necessary to increase the duty cycle of the application in order to prevent excessive soot accumulation and plugging of the After treatment Diesel Particulate Filter. The Engine Control Module (ECM) will set this fault if it detects that the After treatment Diesel Particulate Filter is plugged or that the differential pressure across the Diesel Particulate Filter is above the calibrated moderately severe threshold limit. The ECM will illuminates the MIL lamp immediately when the diagnostic runs and fails. The driver will be notified via the vehicle's EVIC Message Center. The ECM will deactivate the after treatment regeneration system. The ECM will turn off the MIL lamp immediately after the soot load has dropped below the Moderately Severe Level Threshold.

- When Monitored:
The diagnostic runs continuously when the engine is running.

- Set Condition:
The Engine Control Module (ECM) will set this fault if it detects that the soot load in the Diesel Particulate Filter is above the moderately severe level threshold limit.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. DTC ACTIVE OR STORED

NOTE: DTC P2463 is usually the result of a driveability or fuel system failure. This DTC indicates that there is an excessive soot level in the After treatment Diesel Particulate Filter and the Diesel Particulate Filter needs to be regenerated. This can be caused by the customers driving habits, (not allowing the vehicle to actively regenerate the Diesel Particulate Filter on it's own), or due to a driveability concern causing excessive soot generation in the exhaust system. If there are any other DTCs or driveability concerns present with this DTC, diagnose and repair those concerns before continuing with this test procedure. Not repairing the cause of the excess soot being generated will cause the Diesel Particulate Filter to fill with soot too often, and this DTC to return prematurely.

1. Ignition on, engine not running.
2. With the scan tool, read DTCs.

Is the DTC Active or Stored?

Active

- Perform a scan tool initiated Stationary Desoot.

NOTE: The Mobile Desoot procedure has been replaced by a scan tool initiated Stationary Desoot procedure. The scan tool initiated Stationary Desoot procedure can only be performed if the DTC is active and the ECM is at the latest software version.

- Go To 2

Stored

- The After treatment Diesel Particulate Filter has been regenerated with an active desoot initiated during normal driving conditions. No further action is required. Erase the DTC and deliver vehicle to the customer.

2. ACTIVE OR STORED DTC
1. With the scan tool, read DTCs.

Is DTC Active or Stored?

Active

- Replace the After treatment Diesel Particulate Filter and reset the regenerative timers with the scan tool.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

Stored

- Erase DTC. Repair complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.