Wrangler L6-4.0L VIN S (2000)
Powertrain Control Module: Customer Interest
PCM - Rough Engine Idle/MIL ON
NUMBER: 18-013-01
GROUP: Vehicle Performance
DATE: June 11, 2001
SUBJECT:
Rough Idle at Cold Temperatures
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (Cal level 00Cal15C.).
MODELS:
2000
(TJ)
Wrangler
2000
(WJ)
Grand Cherokee
2000
(XJ)
Cherokee
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 4.0L (ERH) ENGINE, CALIFORNIA EMISSIONS (NAE), AND
CALIBRATION LEVEL PRIOR TO (LESS OR LOWER THAN) THAT LISTED IN THE OVERVIEW ABOVE.
SYMPTOM/CONDITION:
Some vehicle engines may exhibit a rough idle and/or MIL light "on" condition upon initial start-up after a cold soak when temperatures are below 50°F
(10°C).
DIAGNOSIS PROCEDURES:
1.
Using the Diagnostic Scan Tool (DRBIII(R)) with the appropriate Diagnostic Procedures, verity all engine/transmission systems are functioning as
designed. If other Diagnostic Trouble Codes are present, record them on the repair order and repair as necessary before proceeding further with
this bulletin.
2.
If the only condition seen is the rough idle and/or MIL light "on" condition upon initial start-up after a cold soak when temperatures are below 50°
F (10°C) 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 2084 OR HIGHER (CD 2084 ARRIVES IN DEALERSHIPS ON JUNE 11, 2001).
