Commander 4WD V8-4.7L VIN N (2006)
PROM - Programmable Read Only Memory: Customer Interest
Engine Controls - Hesitation Feel Between 38 To 45 MPH
NUMBER: 18-018-10
GROUP: Vehicle Performance
DATE: May 26, 2010
THIS BULLETIN SUPERSEDES SERVICE BULLETIN 18-004-09 REV. B, DATED OCTOBER 30, 2009, WHICH SHOULD BE REMOVED
FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE THE ADDITIONAL VEHICLE BODIES
AND YEARS.
THE wiTECH DIAGNOSTIC APPLICATION IS THE PREFERRED METHOD FOR FLASHING ECUs.
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 10.04 OR HIGHER TO PERFORM THIS PROCEDURE.
StarMOBILE DESKTOP CLIENT MAY ALSO BE USED TO PERFORM THIS PROCEDURE.
SUBJECT:
Flash: Hesitation Feel Between 38 To 45 MPH
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.
MODELS:
2005 - **2008**
(WK)
Grand Cherokee
2005 - **2008**
(WH)
Grand Cherokee (International Markets)
2006 - **2008**
(XK)
Commander
2006 - **2008**
(XH)
Commander (International Markets)
NOTE:
This bulletin applies to vehicle equipped with a 4.7L engine (sales code EVA or EVD).
SYMPTOM/CONDITION:
Some customers may complain of a condition that feels like an irregular, very short, slight deceleration as if the vehicle is being "tugged" from behind.
This condition exists between 1000 and 1600 rpm, 38 to 45 mph at constant speed. This condition will be more noticeable during a light acceleration
within the 38 to 45 mph vehicle speed.
This new software update has removed 3rd gear partial lockup and raised the 4th gear full lockup speed to 50 mph.
NOTE:
Two PCM calibrations are available for this vehicle. Please review the flash description to ensure you are selecting the proper file for this condition.
DIAGNOSIS:
Using a Scan Tool (StarSCAN(R)) with the appropriate Diagnostic Procedures available in TechCONNECT, verify all engine systems are functioning as
designed. If DTC's other then the ones listed above are present record them on the repair order and repair as necessary before proceeding further with
this bulletin.
PARTS REQUIRED:
REPAIR PROCEDURE:
