PCM - Cold Start Time, Speed Control Acceleration
NO: 18-27-96GROUP: Vehicle Performance
DATE: Oct. 4, 1996
SUBJECT:
Long Start Time Cold, RPM Undershoot, RPM Flare, Speed Control Acceleration, Erroneous MIL Illumination
MODELS:
1996 (FJ) Avenger/Sebring/Talon
NOTE:
THIS BULLETIN APPLIES TO 1996 MODELS WITH 2.0L DOHC ENGINES ONLY.
SYMPTOM/CONDITION:
1. Long cold engine start time in ambient temperatures above 30°F (MTX/EATX).
2. Engine RPM undershoot immediately after a cold start, or with gear engagements, A/C engagement, power steering input and/or heavy electrical load after a cold start in ambient temperatures above 30°F (MTX/EATX).
3. RPM flare after a power steering input with A/C and blower motor switch in the "ON" position (MTX/EATX).
4. Over aggressive vehicle acceleration rate in 3rd gear when climbing a grade with speed control activated (MTX/EATX).
5. False EGR SYSTEM FAILURE hex $2e (MTX/EATX), or BRAKE SWITCH STUCK PRESSED OR RELEASED hex $98 (MTX only).
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) other than those listed 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 one or more of the above symptoms have been experienced, perform the Repair Procedure.
EQUIPMENT REQUIRED:
All Symptoms (Flash Programming)
1 CH6000 Scan Tool (DRB III)
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7010 J1962/MMC Cable
1 4669020 Label - Authorized Software Update
1 4275086 Label - Authorized Modification
NOTE:
THE MDS AND DRB III ARE REQUIRED TO PERFORM THIS REPAIR AND THE SYSTEM MUST BE OPERATING WITH RELEASE 20 OR HIGHER AND TIL CD RELEASE 1117 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.
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 WITH MDS & DRB III 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.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 08-19-46-91 0.5 Hrs.
FAILURE CODE: FM - Flash Module