Nitro 2WD V6-3.7L (2011)
Control Module: Customer Interest
A/T Controls - MIL ON/DTC's Set/Lack Of Performance
NUMBER: 18-020-11
GROUP: Vehicle Performance
DATE: April 19, 2011
HELP USING THE wiTECH DIAGNOSTIC APPLICATION FOR FLASHING AN ECU IS AVAILABLE BY SELECTING "HELP" THEN "HELP
CONTENTS" AT THE TOP OF THE wiTECH DIAGNOSTIC APPLICATION WINDOW.
THE wiTECH SOFTWARE LEVEL MUST BE AT RELEASE 11.03 OR HIGHER TO PERFORM THIS PROCEDURE.
SUBJECT:
Flash: MIL Illumination And Driveability/Transmission Improvements
OVERVIEW:
This bulletin involves flash reprogramming the Transmission Control Module (1CM) with new software.
MODELS:
2011
(JK)
Wrangler (International Only)
2011
(KA)
Nitro
2011
(KK)
Liberty (International Only)
2011
(LC)
Challenger
NOTE:
This Service Bulletin applies to vehicles equipped with a NAG1 transmission (Sales Code DGJ) built before February 1, 2011 (MDH 0201XX).
SYMPTOM/CONDITION:
Some customers may notice any of the following;
MIL Illumination
Upon further investigation the Technician may find that the following Diagnostic Trouble Codes (DTC) have been set:
a. P0730 - Incorrect Gear Ratio(All Body). See Item "C" below for explanation.
b. P0219 - Engine Overspeed (All Body).
Driveability Improvements:
a. At a light throttle tip in (2 to 6%) the RPM may oscillate slightly (+/-200 rpm). If the throttle tip in is increased then the issue is not present (All
Body).
b. 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 1CM 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 (All Body).
c. 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 DTC 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 1CM 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 (All Body).
Transmission Improvements:
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 (All Body).
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
