RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
PROM - Programmable Read Only Memory: Customer Interest
PCM - False Mil ON, DTC P0443 Set
NO: 18-35-98
GROUP: Vehicle Performance
DATE: Dec. 18, 1998
SUBJECT:
Erroneous MIL
Illumination With DTC $12
(PO443) - Evap Purge
Solenoid Circuit
MODELS:
1999
(AB)
Ram Van
1999
(AN)
Dakota
1999
(BR/BE)
Ram Truck
1999
(DN)
Durango
1999
(TJ)
Wrangler
1999
(WJ)
Grand Cherokee
1999
(XJ)
Cherokee
NOTE:
THIS INFORMATION APPLIES TO VEHICLES EQUIPPED WITH GASOLINE ENGINES BUILT PRIOR TO DEC. 18, 1998 (MDH 1218XX).
SYMPTOM/CONDITION:
Some vehicles may exhibit MIL illumination with DTC $12 (P0443) - EVAPORATIVE PURGE SOLENOID CIRCUIT FAILURE. This condition can
be caused by electrical noise generated by the ignition switch.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS/MDS2) or the Diagnostic Scan Tool (DRB III(R)) with the appropriate Diagnostic Procedures Manual, verify
all engine/transmission systems are functioning as designed. If other Diagnostic Trouble Codes (DTC's) are present, record them on the repair order and
repair as necessary before proceeding further with this bulletin. Following the Diagnostic Procedures Manual, check the evaporative purge solenoid and
circuit for proper operation. If no trouble is found, perform the Repair Procedure.
NOTE:
WHENEVER A POWERTRAIN CONTROL MODULE (PCM) IS REPLACED DUE TO FAILURE, THE SOFTWARE OF THE
REPLACEMENT CONTROLLER SHOULD BE VERIFIED FOR THE LATEST REVISION LEVEL. USE THE FLASH PROCEDURE TO
UPDATE REPLACED CONTROLLERS AS NECESSARY.
EQUIPMENT/PARTS REQUIRED:
1
CH6000
Scan Tool (DRB III(R))
1
CH7035
General Purpose Interface Bus Cable (GPIB)
1
CH7OOO/7001
J1962 Cable
1
04669020
Label - Authorized Software Update
1
04275086
Label - Authorized Modification
NOTE:
THE MDS AND DRB III(R) ARE REQUIRED TO PERFORM THIS REPAIR AND THE SYSTEM MUST BE OPERATING WITH RELEASE
21 OR HIGHER AND TIL CD RELEASE 1175 OR HIGHER MUST BE INSTALLED.
REPAIR PROCEDURE:
This procedure involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (99cal14 calibration change).
1.
Connect the MDS (Mopar Diagnostic System) and DRB III(R) (Scan Tool) to the vehicle and power them up.
2.
Use the arrow keys and select # 2 CONNECT TO MDS 1 OR MDS 2 on the DRB III(R) MAIN MENU Screen.
