Grand Cherokee 4WD V8-4.7L (2003)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Engine Controls - Erratic A/T Operation/MIL ON
NUMBER: 18-013-04
GROUP: Vehicle Performance
DATE: March 30, 2004
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-005-03 REV. C, DATED AUG. 1, 2003, WHICH SHOULD BE
REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDES ADDITIONAL REPAIR
PROCEDURES REQUIRING THE TECHNICIAN TO DISCONNECT THE CONTROLLER ANTILOCK BRAKES (CAB) BEFORE
PERFORMING THE FLASH PROCEDURE ON AN/DN/DR VEHICLES.
SUBJECT:
Flash: Transmission Shift/Speed Control Improvements/possible MIL Illumination
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) or the Transmission Control Module (TCM) with
new software.
MODELS
NOTE:
This bulletin applies to KJ vehicles equipped with a 2.8L turbo diesel engine (sales code ENR), DR/KJ vehicles equipped with a 3.7L engine (sales
code EKG), AN/DN/DR/WG/WJ vehicles equipped with a 4.7L engine (sales codes EVA, or EVC) and DR vehicles equipped with a 5.7L engine
(sales code EZA).
SYMPTOM/CONDITION:
Vehicle operator may experience:
^
MIL illumination - 4.7L ANI/DN/DR vehicles.
^
While operating in speed control, a loss of vehicle speed may be experienced prior to transmission down shift. The up shift may then be noticeably
delayed - 4.7L AN/DN/DR vehicles.
^
Selecting "OD-Off" may produce high engine speeds while operating with the transfer case in low range - AN/DN/DR/KJ/WG/WJ vehicles.
^
Selecting "Resume" or "OD Off" at highway speeds may produce high engine speeds - KJ 2.8L Turbo Diesel vehicles.
^
Multiple shift maneuvers, such as repeated reverse to drive shifts, as in snow plow applications, may cause a rough idle and/or throttle tip-in sag. No
MIL illumination or stored DTC's. Restarting the engine will clear the condition - 5.7L DR vehicles.
Technician may find the following Diagnostic Trouble Codes (DTC) on 4.7L AN/DN/DR vehicles:
^
P0335 - Crankshaft Position Lost.
^
P0340 - Camshaft Position Lost.
^
P0499 - NVLD Canister Vent Valve Solenoid Circuit High.
^
P0622 - Generator Field Not Switching Properly.
^
P1604 - PCM Internal Dual-Port RAM Read/Write Integrity Failure.
This transmission software raises the maximum 4'-4 and 4-3 kick down speeds - KJ 2.8L Turbo Diesel vehicles.
