Flash: 6.4L Powertrain Diagnostic And System Enhancements
This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest
available software.
A small number of customers may experience a Malfunction Indicator Lamp (MIL)
illumination. Upon further investigation the technician may find the following DTCs:
· **P0335 - Crankshaft Position Sensor Circuit.
· P2610 - PCM Internal Engine Off Timer Performance.**
· P0456 - EVAP System Small Leak.
· P3402 - Cylinder 1 Deactivation Control Performance.
· P3426 - Cylinder 4 Deactivation Control Performance.
· P3442 - Cylinder 6 Deactivation Control Performance.
· P3450 - Cylinder 7 Deactivation Control Performance.
· P2610 - PCM Internal Engine Off Timer Performance set in the PCM memory.
In addition to the DTCs listed above, the software update will improve:
· **Correct an issue related to rounding of the cruise control set speed displayed in
the cluster.
· Brake Throttle Override calibration has changed to be less sensitive.
· Throttle Body supplier change has caused a widening of the minimum and maximum
voltage limits
· Correct a software issue with oil pressure light function at key-up.
· Correct a software issue related to idle timer.
· Correct a software issue with inconsistent engine RPM increments/decrements with
operator idle speed.(DD/DF/DP ONLY).**
· Improved Cruise Control Acceleration mode.
· Improved Multi Displacement System operation 6-Speed Automatic 66RFE
transmission (Sales Code DFP).
· Multi Displacement System function improved while in PTO stationary mode.
6-Speed Auto Aisin AS66RC transmission (Sales Code DF3).
· Potential small improvement in fuel economy at higher altitudes.
· Potential improvement in high altitude engine idle RPM stability.
· EGR monitor status function.
