Grand Cherokee 4WD Laredo V8-4.7L (2002)
PROM - Programmable Read Only Memory: Customer Interest
Engine Controls/Emissions - MIL ON/Erroneous DTC P0456
NUMBER: 18-002-03
GROUP: Vehicle Performance
DATE: Jan. 31, 2003
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-016-02 REV A, DATED SEPTEMBER 23, 2002, WHICH SHOULD BE
REM9VED FROM YOUR FILES. THE REVISION IS HIGHLIGHTED WITH **ASTERISK** AND INCLUDES AN ADDITIONAL MODEL
YEAR FOR THE WJ VEHICLES.
THIS BULLETIN IS BEING PROVIDED IN ADVANCE. THE TechCONNECT/MDS2 MUST BE OPERATING WITH CIS CD2126 OR HIGHER,
AVAILABLE FEBRUARY 17, 2003.
SUBJECT:
Flash: MIL Illumination For Erroneous DTC P0456 - EVAP Monitor Small Leak Detected
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.
MODELS:
2002
(AN)
Dakota
2002
(DN)
Durango
**2002** -
(WJ)
Grand Cherokee
2003
NOTE:
THIS BULLETIN APPLIES TO 2002 (AN) DAKOTA AND (DN) DURANGO EQUIPPED WITH ANY CORPORATE ENGINE AND, **2002**
- 2003 (WJ) EQUIPPED WITH THE 4.7L ENGINE (SALES CODE EVA OR EVC).
SYMPTOM/CONDITION:
The Malfunction Indicator Lamp (MIL) may illuminate due to the erroneous detection of a small leak in the vehicle's evaporative system. The Diagnosis
Trouble Code (DTC) associated with this condition is P0456 (EVAP Monitor Small Leak Detected.) No system leaks are detected when the evaporative
system is tested. The DTC may be intermittent.
DIAGNOSIS:
If MIL is on and Diagnostic Trouble Code (DTC) P0456 is present, perform the Repair Procedure.
PARTS REQUIRED:
EQUIPMENT REQUIRED:
REPAIR PROCEDURE:
