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TSB 18-03-97

Erroneous MIL Illumination/ Driveability Improvements

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Date: Jan. 24, 1997

Models: 1996 BR (gas)

1996     (AB)    Ram Van/Wagon
1996     (AN)    Dakota
1996     (BR)     Ram Truck
1996     (XJ)     Cherokee
1996     (ZJ)      Grand Cherokee

Symptoms:

Applies to vehicles with the following applications and conditions:

 
Vehicle Engine Transmission Condition
AN 2.5L M\T Erroneous DTC Hex $69 - DOWNSTREAM 02 SENSOR HEATER FAILURE
AB/AN/BR 3.9L All Cold engine warm up sag/hesitation in moderate ambient temperatures.
AB/AN/BR/ZJ 5.2L A\T - Driveaway sag/hesitation within the first 20 seconds following a cold engine start
. - Cold engine sag following a 1-2, 2-3, or lockup shift.
AB/BR 5.9L A\T - Vehicle surge at constant speeds with cruise control engaged.
- Cold engine sag following a 1-2, 2-3, or lockup shift.
XJ/ZJ 4.0L All Spark knock during moderate to heavy load and/or deep throttle acceleration
AB/AN/BR/ZJ 2.5/3.9/5.2/
5.9/4.0 Liter
4XRE - Cold transmission delayed 1-2 upshift during wide open throttle acceleration
- Overdrive (OID) enable feature for low ambient temperatures. NOTE: ONLY TO BE USED WITH A COOLER BYPASS KIT
AB/AN/BR/
ZJ/XJ
2.5/3.9/5.2/
5.9/4.0 Liter
All Erroneous DTC Hex $24 - MAP SENSOR VOLTAGE TOO LOW.

Diagnosis:

Using the Mopar Diagnostic System (MDS) 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 or those listed above are present and any of 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 PCM SHOULD BE VERIFIED FOR THE LATEST REVISION LEVEL. EQUIPMENT REQUIRED:

Equipment/Parts Needed:

NOTE: THE MDS AND DRB III ARE REQUIRED TO PERFORM PART OF THIS REPAIR AND THE SYSTEM MUST BE OPERATING WITH RELEASE 21 OR HIGHER AND TIL CD RELEASE 1124 OR HIGHER MUST BE INSTALLED.

Repair:

This Procedure involves selectively erasing and reprogramming the PCM with new software (calibration changes).

1.    Connect the MDS (Mopar Diagnostic System) and DRS III (Scan Tool) to the vehicle and power them up.

2.    Use the arrow keys and select #2 MDS DIAGNOSTICS on the DRB III MAIN MENU Screen.

3.    Use the arrow keys and select DIAGNOSTIC MENU on the MDS, then press NEXT MENU.

4.    Use the arrow keys and select VEHICLE CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.

5.    Use the arrow keys and select PROGRAMMING OF ALL OTHER CONTROLLERS USING MDS & DRB III on the MDS, then press NEXT MENU,

6.    Follow the steps presented on the MDS and DRS III which will allow the DRB III to obtain the current part number of the PCM

7.    The MDS will display the part number of the PCM on the vehicle and the appropriate replacement part number, then press NEXT MENU to begin programming.

If the PCM on the vehicle has already been updated or programmed, a NO UPDATES AVAILABLE message will be displayed. Check the part number of the PCM on the vehicle and compare it to the part number displayed. If the PCM has already been updated, then another condition exists that will require further diagnosis and repair

8.    The MDS and DRB III will prompt for any operator action needed during the remainder of the programming process.

NOTE: THE FOLLOWING STEPS ARE REQUIRED BY LAW

9.    Type or print necessary info on the "Authorized Software Update" label (Fig 1) and attach it to the ECM. Cover the label with clear tape.

10.   Type or print the following information on the Authorized Modification Label and attach the label near the VECI label (Fig 2).

Notes:

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:
Labor Operation No: 08-19-47-94 ................. 0.5 Hrs.

FAILURE CODE: FM - Flash Module


Thanks to Bob Bergevin and Barry Drodge for supplying this TSB information

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This page was edited on: May 3, 2004