Catalyst Monitor Doesn't Light Mil Or Set Fault Code (25-02-99)

Publication date: 1999-11-29
Reference number: 25-02-99

CATALYST MONITOR DOESN'T LIGHT MIL OR SET FAULT CODE

TECHNICAL SERVICE BULLETIN

Reference Number(s): 25-02-99, Date of Issue: November 29, 1999

CATALYST MONITOR DOES NOT ILLUMINATE MIL OR SET A FAULT CODE

Model(s): 2000 Dodge (AB) Ram Van

2000 Dodge (AN) Dakota

2000 Dodge (BR/BE) Ram Truck

2000 Dodge (DN) Durango

2000 Jeep (TJ) Wrangler

2000 Jeep (XJ) Cherokee

2000 Jeep (WJ) Grand Cherokee

Group: Emissions

Bulletin No.: 25-02-99

Effective Date: November 29, 1999

OVERVIEW

This bulletin involves selectively erasing and reprogramming the JTEC Powertrain Control Module (PCM) with new software (calibration change 00Cal13A).

NOTE: This information applies to vehicles equipped with a single upstream oxygen sensor and built before November 1, 1999 (MDH 1101XX). Vehicles involved in this Technical Service Bulletin include:

All Jeep and truck federal emission packages (NAA) except the BR/BE with a 5.9L or 8.0L heavy duty engine.
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.
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

PARTS INFORMATION

Qty.	Part Number	Part Name
1	04669020	Label, Authorized Software Update
1	04275086	Label, Authorized Modification

EQUIPMENT REQUIRED

EQUIPMENT INFORMATION

Qty.	Tool Number	Tool Name
1	CH6000	Scan Tool (DRB III)
1	CH7035	General Purpose Interface Bus Cable (GPIB)
1	CH7000/7001	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.

REPAIR PROCEDURE

Log onto the MDS2 system.
Connect the MDS2 (Mopar Diagnostic System) and DRB III (Scan Tool) to the vehicle and switch the ignition key to "ON".
Use the arrow keys and select #2 CONNECT TO MDS2 on the DRB III MAIN MENU SCREEN.
Use the arrow keys and select #2 RUN MDS2 APPLICATION on the DRB III MAIN MENU SCREEN.
NOTE: Once MDS2, DRB III, and vehicle communication has been established, the "Cannot Read VIN From DRB III" message (on the MDS) will be replaced by the vehicle VIN. Press the "OK" button on the MDS2 to request a MDS2 session for the vehicle VIN indicated. Press the "OK" button when asked to begin session.
Push the FLASH tab on the MDS2.
NOTE: A message may appear that indicates no updates are available. If this occurs, make sure your diagnostic equipment is operating at the latest software level as listed earlier in this bulletin. If the latest software is installed, and no updates are available, another vehicle condition exists that will require further investigation.
Select READ PART NUMBERS FROM VEHICLE and click SHOW UPDATES on the MDS2.
NOTE: A message may appear that indicates no updates are available. If this occurs, make sure your diagnostic equipment is operating at the latest software level as listed earlier in this bulletin. If the latest software is installed, and no updates are available, another vehicle condition exists that will require further investigation.
Select the new software part number with the light pen and click UPDATE CONTROLLER SOFTWARE.
The MDS2 and DRB III will prompt for any operator action needed during the remainder of the reprogramming process.
NOTE: Due to the PCM flash procedure, a DTC may be set in other modules (EATX, BCM, MIC, SKIM) within the vehicle if so equipped. Some may cause the MIL to illuminate. All DTC's relate to a loss of communications with the module that is being flashed. 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.
Type the necessary information on the "Authorized Software Update Label" P/N 04669020 (Fig 1 ). Attach the label to the JTEC PCM and cover the label with the clear plastic overlay.
Type the necessary information on the "Authorized Modification Label" P/N 04275086 and attach the label near the VECI label (Fig 2 ).

WARRANTY INFORMATION

POLICY: Reimbursable within the provisions of the warranty.

LABOR OPERATION NO.: 08-19-43-98

TIME ALLOWANCE: 0.5 Hrs.

FAILURE CODE: FM - Flash Module

Fig 1: Authorized Software Update Label

Fig 2: Authorized Modification Label