Engine Controls/Emissions - MIL ON/Erroneous DTC P0456
NUMBER: 18-002-03GROUP: 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:
1. Connect a battery charger and set as close to a 14 volts charge as possible.
2. Flash the PCM using the TechCONNECT/MDS2 and DRBIII(R).
NOTE:
DUE TO THE PCM REPROGRAMMING PROCEDURE, A DTC MAY BE SET IN OTHER MODULES (TCM, 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.
3. Type the necessary information on the "Authorized Software Update Label" p/n 04669020 (Fig. 1). Attach the label to the PCM and/or TCM as necessary and cover the label(s) with the clear plastic overlay.
4. Type the necessary information on the "Authorized Modification Label" p/n 04275086AB and attach near the VECI label (Fig. 2).
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE: