Grand Cherokee 4WD SRT-8 V8-6.1L VIN 3 (2006)
Control Module: All Technical Service Bulletins
Drivetrain - Apparent Harsh 1-2/2-3 A/T Shifts
NUMBER: 21-013-07
GROUP: Transmission
DATE: September 15, 2007
THE StarSCAN(R) FLASH FILES FOR THIS BULLETIN ARE AVAILABLE VIA THE INTERNET.
StarSCAN(R) SOFTWARE LEVEL MUST BE AT RELEASE 8.02 OR HIGHER FOR THIS BULLETIN.
StarMOBILE STANDALONE MODE OR StarMOBILE DESKTOP CLIENT MAY ALSO BE USED TO PERFORM THIS PROCEDURE.
SUBJECT:
FLASH: Harsh 1-2 Shift Or 2-3 Shift
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Final Drive Control Module (FDCM) with new software.
NOTE:
The FDCM will set an active DTC after the flash procedure is preformed. This will happen every time the FDCM is flash reprogrammed. Erase DTC
using the appropriate Scantool.
MODELS:
2006-2007
(WK)
Grand Cherokee SRT-8
2006 - 2007
(WH)
Grand Cherokee (International Markets)
NOTE:
This bulletin applies to vehicles equipped with a 6.1L engine (Sales Code ESF).
SYMPTOM/CONDITION:
A bump or a harsh shift is felt by the customer caused by the transfer case actuation. Customers describe this as either a harsh 1-2 shift or 2-3 shift. The
transfer case clutch actuates at 20.5 mph for approximately 750 ms after each key cycle as directed via FDCM software to re-learn the clutch starting
position. This can generate a torque pulse in the driveline under light to medium throttle conditions that can be construed as a transmission shift event.
DIAGNOSIS:
Using a StarSCAN(R) with the appropriate Diagnostic Procedures available in TechCONNECT, verify all transmission Systems are functioning as
designed.
If the vehicle operator describes the Symptom/Conditions and they can be verified, perform the appropriate Repair Procedure.
SPECIAL TOOLS / EQUIPMENT REQUIRED:
REPAIR PROCEDURE - USING StarSCAN AND THE INTERNET TO RETRIEVE THE FLASH FILE: