Catalyst Monitor Does Not Illuminate MIL/Set Fault Code: Overview
NUMBER: 25-02-99GROUP: Emissions
EFFECTIVE DATE: Nov. 29, 1999
SUBJECT:
Catalyst Monitor Does Not Illuminate MIL Or Set A Fault Code
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the JTEC Powertrain Control Module (PCM) with new software (calibration change OOCal13A).
MODELS:
2000 (AB) Ram Van
2000 (AN) Dakota
2000 (BR/BE) Ram Truck
2000 (DN) Durango
2000 (TJ) Wrangler
2000 (XJ) Cherokee
2000 (WJ) Grand Cherokee
NOTE:
THIS INFORMATION APPLIES TO VEHICLES EQUIPPED WITH A SINGLE UPSTREAM OXYGEN SENSOR AND BUILT BEFORE NOVEMBER 1, 1999 (MDH 11O1XX). VEHICLES INVOLVED IN THIS TECHNICAL SERVICE BULLETIN INCLUDE:
1). ALL JEEP AND TRUCK FEDERAL EMISSION PACKAGES (NAA) EXCEPT THE BR/BE WITH A 5.9L OR 8.0L HEAVY DUTY ENGINE.
2). ALL TRUCK CALIFORNIA EMISSION PACKAGES (NAE) EXCEPT THE AN OR THE DN WITH A 4.7L ENGINE, OR THE BR WITH 5.2L AUTO. TRANS OR 5.9L WITH AUTO. TRANS.
3). ONLY JEEP TJ AND XJ CALIFORNIA EMISSION PACKAGES (NAE) WITH A 2.5L ENGINE.
SYMPTOM/CONDITION:
The vehicle On-Board Diagnostic (OBD) System may not illuminate the Malfunction Indicator Lamp (MIL) or set a Diagnostic Trouble Code (DTC) when a possible problem may have been detected by the catalyst monitor.
This condition will most often occur when the technician is in the process of performing powertrain diagnostics.
NOTE:
ALL APPLICABLE VEHICLES BROUGHT IN FOR ANY MAINTENANCE MAY HAVE THIS FLASH PROCEDURE PERFORMED.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS2) and or the Diagnostic Scan Tool (DRB III) with the appropriate Diagnostic Procedures Manual, verify all engine/transmission systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order and repair as necessary before proceeding further with this bulletin. If no DTC's are present, and the above symptoms have been experienced, perform the Repair Procedure.
NOTE:
WHENEVER A POWERTRAIN CONTROL MODULE (PCM) IS REPLACED DUE TO FAILURE, THE SOFTWARE OF THE REPLACEMENT CONTROLLER MUST BE VERIFIED FOR THE LATEST REVISION LEVEL. USE THE FLASH PROCEDURE TO UPDATE REPLACED CONTROLLERS AS NECESSARY.
PARTS REQUIRED:
1 04669020 Label, Authorized Software Update
1 04275086 Label, Authorized Modification
EQUIPMENT REQUIRED:
1 CH6OOO Scan Tool (DRB III)
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7OOO/7001 J1962 Cable
1 MDS2
NOTE:
THE MDS2 AND DRB III ARE REQUIRED TO PERFORM PART OF THIS REPAIR. WHEN USING THE MDS2 AND THE DRB III, THE SYSTEM MUST BE OPERATING AT CIS CD 2046 OR HIGHER.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 08-19-43-98 0.5 Hrs.
FAILURE CODE: FM - Flash Module