Engine Controls - Battery Lamp ON/False DTC P1594
NUMBER: 18-023-03GROUP: Vehicle Performance
DATE: June 20, 2003
THIS BULLETIN IS BEING PROVIDED IN ADVANCE. THE MDS2 MUST BE OPERATING WITH CIS CD2136 OR HIGHER, AVAILABLE JULY 7, 2003.
SUBJECT:
Flash: Battery Light Illumination, Erroneous Diagnostic Trouble Code (DTC) P1594
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.
MODELS:
2001 - 2003 (RS) Town & Country/Caravan/Voyager
NOTE:
THIS BULLETIN APPLIES TO U.S. AND CANADIAN MARKET VEHICLES EQUIPPED WITH 3.3L OR 3.8L ENGINE (SALES CODES EGA, EGM, OR EGH).
SYMPTOM/CONDITION:
Vehicle operator may experience Battery light illumination.
Technician may find DTC P1594 - Charging System Voltage Too High.
DIAGNOSIS:
Using a Scan Tool (DRBIII(R)) with the appropriate Diagnostic Procedures, verify all engine systems are functioning as designed. If DTCs are present, other than those listed above, record them on the repair order and repair as necessary before proceeding further with this bulletin.
If the vehicle operator describes the Symptom/Condition and the technician finds DTC P1594, perform the Repair Procedure.
PARTS REQUIRED
EQUIPMENT REQUIRED
REPAIR PROCEDURE:
NOTE:
WHENEVER A PCM/TCM IS REPLACED OR REPROGRAMMED, THE SOFTWARE IN THE CONTROLLER AND DRBIII(R) MUST BE VERIFIED AS HAVING THE LATEST REVISION LEVEL. IF A CONTROLLER SOFTWARE UPDATE FLASH IS AVAILABLE, COMPLETE THE FLASH AND LABELING REQUIREMENT AS DIRECTED IN THE APPROPRIATE SERVICE BULLETIN IDENTIFIED ON THE TechCONNECT/MDS2.
1. Connect a battery charger and set as close to 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 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