Durango 4WD V6-3.6L (2011)
k. P0298 - Engine Oil Temperature Too High (WK/WD Bodies)
Driveability Improvements or Tapping Sound WK Body only
a. A slight tapping sound is heard from under the hood. This could also be described as a rattle or clicking sound also. This condition can be heard
when the ignition key is turned to accessory or start or right after ignition key has been turned off. This condition was caused by a cleaning routine of
the cam actuator controller by the PCM. To correct this condition a calibration change was made to modify the duty cycle and frequency of the PCM
controlled cleaning routine of the cam actuator.
b. At a light throttle tip in (2 to 6%) the RPM may oscillate slightly (+1-200 rpm). If the throttle tip in is increased then the issue is not present.
c. Lacks Performance. Some driving conditions can produce circumstances where some customers may perceive more pedal effort is required to get the
Powertrain to accelerate the vehicle as desired. The PCM calibration for pedal vs. torque relationship was changed to allow for more torque delivery
at less pedal effort/travel. In accordance with this PCM calibration change, the TCM was re-calibrated to provide optimal performance and fuel
economy. The combined PCM and TCM software improvements will translate into a feeling of improved performance to the driver.
d. Customer describes a temporary "Loss of Power" event due to transmission going to Neutral during a heavy throttle 4-3 downshift. This may happen
when driving at moderate speed, 35 to 70 MPH (56 to 112 KPH) when the driver accelerates with pedal input from 40-100% triggering a 4-3
downshift. The may set the P0730 - Incorrect Gear Ratio DIG along with the MIL light ON and cause a Neutral condition within the transmission.
This will typically be described as a "Loss of Power" complaint. The MIL for the P0730 will clear after 3 consecutive ignition cycles without setting
another P0730 DTC. The P0730 DTC will remain stored in the TCM for 40 consecutive "good" ignition cycles and then be cleared. To correct this
condition the TCM pressure control and torque management were re-calibrated improve the 4-3 downshift control during these conditions.
Transmission Improvements WK Body only:
a. Lack of performance feeling during low vehicle speed turning or cornering maneuvers. To correct this condition a new TCM feature was developed
to detect when the vehicle is in a turn and will then not perform an upshift.
b. Harsh 3-4-3 change mind shift. This happens when driving at moderate speed of 30 to 50 mph (48 to 80 kmh) when the driver reduces accelerator
pedal input to 5-10%. The TCM then schedules a 3-4 upshift. When the driver accelerates rapidly, pedal input from 40-100% this will CANCEL the
3-4 upshift and trigger a "change mind" shift and revert back to 3rd gear. The TCM "change mind" pressure control and torque management were
re-calibrated to smooth the shift control during this maneuver.
c. Noticeable higher engine RPM during low speed driving. This condition will be noticed during parking lot or city traffic low speed driving. The
TCM logic was refined to keep the upshift inhibit more linear vs. vehicle speed.
d. Engagement shudder when transmission is shifted into DRIVE or REVERSE immediately after the vehicle is starting. This shudder is caused by a
lack of hydraulic prime in the transmission pump which requires a higher pressure demand to the applying clutch to avoid the shudder during the
engagement. The TCM logic was changed to detect an engagement to DRIVE or REVERSE immediately after the engine starting which will then
utilizing a special pressure apply rate ONLY during these conditions.
e. More pedal effort to maintain speed while towing trailer during HOT ambient conditions of greater than 100° F (37° C). The TCM logic was
optimized to improve this feeling.
f.
Overall Improved shift quality. TCM calibrations were changed to deliver optimal shift quality during all driving conditions.
g. Poor shift quality when using autostick (-) lever to initiate a transmission down shift. This will be notice when tapping lever (-) minus around 35 to
45 MPH (56 to 72 KPH) with a light accelerator pedal input of 5 to 10%. This was caused by B2 clutch apply pressure being calibrated too high for
the 4-3 downshift. The TCM calibration was changed to lower the B2 clutch apply pressure during this maneuver.
DIAGNOSIS:
Using a Scan Tool (wiTECH(TM)) with the appropriate Diagnostic Procedures available in TechCONNECT, verify no DTC's are set. If DTC's are
present other then the one listed above record them on the repair order and repair as necessary before proceeding further with this bulletin.
If the above condition is present, perform the Repair Procedure.
PARTS REQUIRED:
