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PCM - Cold Start RPM Flare

NUMBER: 18-012-02

GROUP: Vehicle Performance

DATE: February 25, 2002

THIS BULLETIN IS BEING PROVIDED IN ADVANCE. THE MDS2 MUST BE OPERATING WITH CIS CD2103 OR HIGHER, AVAILABLE MARCH 18, 2002.

SUBJECT:
Flash: Cold Start RPM Flare

OVERVIEW:
This bulletin involves selectively erasing and reprogramming the JTEC Powertrain Control Module (PCM) with new software (99Ca120A and OOCal20A).

MODELS:
1999 - 2000 (WJ) Jeep Grand Cherokee

NOTE:
THIS BULLETIN APPLIES TO 1999 (WJ) JEEP GRAND CHEROKEES EQUIPPED WITH A 4.7L ENGINE AND CALIBRATION LEVEL PRIOR TO (LESS OR LOWER THAN) THOSE LISTED IN THE OVERVIEW ABOVE.

SYMPTOM/CONDITION:

The customer may complain that the engine rpm's flare up when the engine is started.





PARTS REQUIRED:





EQUIPMENT REQUIRED:

REPAIR PROCEDURE:

1. Flash the controller using the MDS2 (Mopar Diagnostic System) and DRBIII(R).

NOTE:
DUE TO THE PCM REPROGRAMMING PROCEDURE, A DTC MAY BE SET IN OTHER MODULES (EATX, BCM, MIC, SKIM, ETC.) WITHIN THE VEHICLE, IF SO EQUIPPED. SOME DTC'S MAY CAUSE THE MEL TO ILLUMINATE. ALL DTC'S RELATE TO A LOSS OF COMMUNICATIONS WITH THE MODULE THAT IS BEING REPROGRAMMED. CHECK ALL MODULES, RECORD THE FAULTS, AND ERASE THESE FAULTS PRIOR TO RETURNING THE VEHICLE TO THE CUSTOMER. ERASE ANY FAULTS IN THE PCM ONLY AFTER ALL OTHER MODULES HAVE HAD THEIR FAULTS ERASED.

NOTE:
THE FOLLOWING STEPS ARE REQUIRED BY LAW.





2. Type the necessary information on the "Authorized Software Update Label" p/n 04669020 (Fig. 1). Attach the label to the PCM and cover the label with the clear plastic overlay.





3. Type the necessary information on the "Authorized Modification Label" p/n 04275086 and attach the label near the VECI label (Fig. 2).

POLICY:
Reimbursable within the provisions of the warranty.





TIME ALLOWANCE:





FAILURE CODE: