Engine - Spark Knock/Hesitation/Sag
NUMBER: 18-021-01 REV. AGROUP: Vehicle Performance
DATE: September 17, 2001
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-021-01, DATED SEPTEMBER 17, 2001, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** WHICH INCLUDE CHANGES TO THE LABOR OPERATION NUMBER.
SUBJECT:
4.7L Engine Performance Enhancements
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (WJ O1CAL15C, DN O1CAL 14D).
MODELS:
2001 DN Durango
2001 WJ Grand Cherokee
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 4.7L (EVA) ENGINE AND CALIBRATION LEVEL PRIOR TO (LESS OR LOWER THAN) THOSE LISTED IN THE OVERVIEW ABOVE.
SYMPTOM/CONDITION:
Some vehicles may exhibit one or more of the following engine performance conditions.
1. Part throttle or wide-open throttle spark knock.
2. Sag or hesitation after a cold engine start up.
DIAGNOSIS:
1. Using the Diagnostic Scan Tool (DRBIII(R)) with the appropriate Diagnostic Procedures, verify all engine/transmission systems are functioning as designed. If other Diagnostic Trouble Codes (DTC) are present, record them on the repair order and repair as necessary before proceeding further with this bulletin.
2. If the condition(s) above is seen perform the Repair Procedure.
PARTS REQUIRED:
EQUIPMENT REQUIRED:
NOTE:
THE MDS2 AND DRB III(R) ARE REQUIRED TO PERFORM PART OF THIS REPAIR, WHEN USING THE MDS2 AND THE DRB III(R), THE SYSTEM MUST BE OPERATING AT CIS 2091 OR HIGHER (CD 2091 ARRIVES IN DEALERSHIPS ON SEPTEMBER 17, 2001).
REPAIR PROCEDURE:
1. Log onto the MDS2 (Mopar Diagnostic System).
2. Connect the MDS2 and DRB III(R) to the vehicle and switch the ignition key to "ON".
NOTE:
AUTO CONNECTION WILL OCCUR ONCE THE DRB III(R), MDS2, AND VEHICLE ESTABLISH COMMUNICATION. THE "CANNOT READ VIN FROM DRB III(R)" MESSAGE (ON THE MDS2) WILL BE REPLACED BY THE VEHICLE VIN. PRESS THE "OK" BUTTON ON THE MDS2 TO REQUEST A MDS2 SESSION FOR THE VEHICLE VIN INDICATED. PRESS THE "OK"BUTTON WHEN ASKED TO BEGIN SESSION.
3. Push the FLASH tab on the MDS2.
4. Select READ PART NUMBERS FROM VEHICLE and click SHOW UPDATES on the MDS2.
NOTE:
A MESSAGE MAY APPEAR (AFTER STEP 3 OR 4) THAT INDICATES NO UPDATES ARE AVAILABLE. IF THIS OCCURS, MAKE SURE YOUR DIAGNOSTIC EQUIPMENT IS OPERATING AT THE LATEST SOFTWARE LEVEL AS LISTED EARLIER IN THIS BULLETIN. IF THE LATEST SOFTWARE IS INSTALLED, AND NO UPDATES ARE AVAILABLE ANOTHER VEHICLE CONDITION EXISTS THAT WILL REQUIRE FURTHER INVESTIGATION.
5. Select the new software part number with the light pen and click UPDATE CONTROLLER SOFTWARE.
6. The MDS2 and DRB III(R) will prompt for any operator action needed during the remainder of the reprogramming process.
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 MIL 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.
7. 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.
8. 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: