PCM - Low Speed Miss/Gear Hunting During Cruise
NO: 18-24-96GROUP: Vehicle Performance
DATE: Aug. 30, 1996
SUBJECT:
2.4L Low Speed Engine Miss
2.4L Gear Hunting During
Cruise Control And/Or Erroneous
EGR, Misfire,and CCD DTC's
MODELS:
1996 (NS) Town & Country/Caravan/Voyager
NOTE:
THIS BULLETIN APPLIES TO VEHICLES BUILT PRIOR TO JUNE 20, 1996 (MDH 06-20-XX).
SYMPTOM/CONDITION:
Powertrain Control Module software changes are being provided to correct the following conditions:
- Some 2.4L equipped vehicles may experience an intermittent single engine miss, typically at low speeds and may result in stalls during idle, with no related diagnostic trouble code DTC's.
- 4-2-4 gear hunting during cruise control operation on 2.4L equipped vehicles with 4ITE ATX.
- Some 3.0L, 3.3L, and 3.8L equipped vehicles may experience erroneous EGR System (DTC 2E), Misfire (DTC's 6A, 6B, 6C, 6D, 6E, AE and/or AF), Thermostat Diagnostic (DTC 21), and No EATX CCD Message (DTC 60) DTC's at cold ambient temperatures.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRBIII) and appropriate Diagnostic Procedure Manual, verify that all engine systems are functioning correctly. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference and repair before proceeding. If the symptom described is still present perform the Repair Procedure.
PARTS REQUIRED:
1 CH6OOO Scan Tool (DRBIII)
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7OOO J1962 Cable
1 4669020 Label - Authorized Software Update
1 4275086 Label - Authorized Modification
REPAIR PROCEDURE:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration change).
NOTE:
MDS AND DRBIII ARE REQUIRED TO PERFORM THE FOLLOWING REPAIR. MDS MUST BE OPERATING WITH RELEASE 20 OR HIGHER AND TIL 1115 OR HIGHER INSTALLED.
1. Connect the MDS and DRBIII to the vehicle and power them up.
2. Use the arrow keys and select # 2 MDS DIAGNOSTICS on the DRBIII 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 CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.
5. Use the arrow keys and select PROGRAM CONTROLLER PART on the MDS, then press NEXT MENU.
6. Follow the steps presented on the MDS and DRBIII which will allow the DRBIII 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 a system problem actually exists and should be corrected.
8. The MDS and DRBIII will prompt the operator for any 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 PGM 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: 08-19-45-96 0.5 Hrs.
FAILURE CODE: FM - Flash Module