Durango 4WD V8-4.7L VIN N (2001)
PROM - Programmable Read Only Memory: Customer Interest
Engine - Spark Knock/Hesitation/Sag
NUMBER: 18-021-01 REV. A
GROUP: 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:
