PCM - Erroneous MIL/Resets/Shift Cycling/Engine Stumble
NO: 18-16-97GROUP: Vehicle Performance
DATE: May 2, 1997
SUBJECT:
Erroneous MIL Illumination With Hex Codes $6A, Erroneous PCM Resets,
Shift Cycling, Cold Engine Stumble
MODELS:
1996 (FJ) Avenger/Sebring
1996 (JA) Breeze/Cirrus/Stratus
1996 (JX) Sebring Convertible
NOTE:
THIS BULLETIN APPLIES TO VEHICLES WITH A 2.5L ENGINE
SYMPTOM/CONDITION:
1. Erroneous MIL illumination with DTC MULTIPLE CYLINDER MIS-FIRE - Hex $6A.
2. Shift cycling between 2nd and 3rd gear while in Cruise Control and the resume function is selected when the vehicle speed is 20 MPH below the set speed.
3. Engine stumble within 10 seconds of a cold start. If this condition persists after repair, it is recommended to change fuel brands.
4. Engine stumble or miss at idle or open throttle at 2 minute intervals. This condition can only occur after a fuel system (rich/lean) fault (MIL) has been set and the condition corrects itself after 3 good OBD II trips or a technician makes repairs and does not erase the faults. The stumble occurs after 3 good OBD II defined trips at which time the engine control module does a reset every 2 minutes during a drive cycle.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Diagnostic Scan Tool (DRB III) with the appropriate Diagnostic Procedures Manual, verify all engine 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 other than 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/PARTS REQUIRED:
1 04671336 Switch, Brake (JA/JX Models Only)
1 CH6000 Scan Tool (DRB III)
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7000/7001 J1962 Cable
1 CH7010 J1962/MMC Cable
1 4669020 Label - Authorized Software Update
1 4275086 Label - Authorized Modification
NOTE:
THE MDS AND DRBIII ARE REQUIRED TO PERFORM THIS REPAIR AND THE SYSTEM MUST BE OPERATING WITH RELEASE 21 OR HIGHER AND TIL CD RELEASE 1131 OR HIGHER MUST BE INSTALLED.
REPAIR PROCEDURE:
This repair involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration changes) for all conditions listed and replacing the brake switch for JA/JX models with a 1997 model year part.
NOTE:
THE SOFTWARE USED TO REFLASH THE 1996 PCM IS 1997 LEVEL SOFTWARE. CONSEQUENTLY, THE PCM WILL REPORT ITSELF AS A 1997 CONTROLLER. MDS AUTOMATED DIAGNOSTICS FOR THE AFFECTED VEHICLES TEMPORARILY WILL NOT WORK.
1. Connect the MDS (Mopar Diagnostic System) and DRB 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 & DRBIII on the MDS, then press NEXT MENU.
6. Follow the steps presented on the MDS and DRB 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 the necessary information on the "Authorized Software Update Label" p/n 4669020. Attach the label to the PCM and cover the label with the clear plastic overlay.
10. Type the necessary information on the Authorized Modification Label and attach the label near the VECI Label.
11. Remove and discard the brake switch on JA/JX models and replace the switch with p/n 04671336.
NOTE:
THE BRAKE SWITCH USED IS A 1997 MODEL YEAR PART.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 08-19-48-92 0.5 Hrs.
Module, Powertrain Control Reprogram
Labor Operation No: 08-80-84-92 0.2 Hrs.
Switch, Brake Lamp Replace
FAILURE CODE: FM - Flash Module
P8 - New Part