Flash: 6.7L Diagnostic And System Improvements
This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find one or more of the following Diagnostic Trouble Codes (DTCs) set in the PCM memory:
· P218F - Reductant No Flow Detected.
· P242F - Diesel Particulate Filter Restriction - Ash Accumulation. P205E - (Diesel Exhaust Fluid) Reductant Tank Temperature Sensor Circuit Intermittent (setting when the block heater is plugged in).
· U110E - Lost Ambient Temperature Message.
· P20E8 - (Diesel Exhaust Fluid) Reductant Pressure Too Low.
· P2281 - Air Leak Between MAF And Throttle Body. P1477 - Intake Air Diverter Valve Position Sensor Circuit Shorted To Ground. U1421 - Implausible Ignition Key Off Time Received.
· P026B - Injection Timing Performance.
In addition to addressing the above DTCs, the following powertrain system improvements/enhancements are also included in this software release:
· NOx sensor calibration improvements. (Sales Code DG7). Enhanced software for a No crank/No start issue. (U0100 - Lost Communication With ECM/PCM). (Sales Code DG7).**
· Ambient Air Temperature (AAT) improvements.
· 68RFE Transmission overall shift quality improvements.
· SCR Efficiency scan tool test improvement.
· Charging system improvements for single alternator applications (Changes the cutout threshold from 600 to 500 RPM).
· Diesel Exhaust Fluid (DEF) system calibration improvement during Stationary Regeneration.
· Cold idle speed stability improvement. Charging system improvements for dual alternator applications.
· Torque increase to 865 ft/lbs (D2 vehicles equipped with the Aisin transmission sales code DF2 only). Fuel Filter Minder calibration changes.
· wiTECH Fuel Pressure Override and Fuel System Run Up test improvements.
